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  • 1.
    Ahlmark, Daniel Innala
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Hyyppä, Kalevi
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Hand-held navigation aid for visually impaired using haptic feedback2014Conference paper (Other academic)
    Abstract [en]

    The white cane is used by many visually impaired individuals as the primary aid for avoiding obstacles. In this it is unparalleled, but it cannot provide a large-scale view of the surroundings the way vision does. This makes navigating independently a challenge for the visually impaired. We are developing the Virtual White Cane (VWC), a device that uses sensors and haptic technologies to complement the limited view of the cane. Sensors makes it possible to probe obstacles far beyond the range of the white cane, and haptic feedback is familiar to users of the regular cane. The purpose of this device is to act as a complement to the standard cane, providing information about the surroundings that are beyond the cane's reach. This kind of extended view not only helps in anticipating obstacles, but also to navigate. The presentation will focus on the hardware of the currently developed prototype, in addition to some initial user experiences.

  • 2.
    Berrebi, Jonathan
    et al.
    Luleå tekniska universitet.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Detection of dynamic installation effects by an ultrasound flow meter in non-stationary flow2004In: Proceedings of the 12th International Conference on Flow Measurement: FLOMEKO, 2004, p. 277-279Conference paper (Refereed)
  • 3. Berrebi, Jonathan
    et al.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Delsing, Jerker
    Detection of pulsating flows in an ultrasonic flow meter2002In: Proceedings of ISA Emerging Technologies Conference, 2002Conference paper (Refereed)
  • 4. Berrebi, Jonathan
    et al.
    van Deventer, Jan
    Delsing, Jerker
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Detection of pulsating flows in an ultrasonic flow meter2002In: Proceedings of the 8th International Symposium on District Heating and Cooling, 2002Conference paper (Refereed)
    Abstract [en]

    Transit-time ultrasonic flowmeters present advantages for district heating applications, since they are accurate, non-intrusive, and cheap. However, such flowmeters are sensitive to velocity profile variations since the flow rate is measured in the volume area between two ultrasonic transducers. Ultrasonic flowmeters are therefore sensitive to installation effects. Installation effects could be either static or dynamic. A pulsating flow is a dynamic installation effect. In the field, the diagnostic can only be performed with the measured flow rate. Flow measurements with and without pulsating flow have been recorded in a flow meter calibration facility. The detection of a pulsating flow can be made by using Hinich's harmogram. It is possible to detect harmonics that emerge from the noise by using the harmogram.

  • 5.
    Berrebi, Jonathan
    et al.
    Luleå tekniska universitet.
    van Deventer, Jan
    Delsing, Jerker
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Detection of the error generated by a single elbow on an ultrasonic flow meter2002In: ISA TECH/EXPO Technology Update Conference Proceedings: ETCON 2002, ISA - Instrumentation, Systems, and Automation Society , 2002, Vol. v 426 II, p. 1268-1279Conference paper (Refereed)
    Abstract [en]

    Ultrasonic flow meters are accurate and non-intrusive. However, one of their drawbacks is their sensitivity to installation effects especially when elbows or pulsating flows are found in front of the meter's inlet. Depending on the flow rate, such installations can create perturbations on the flow measurement. These perturbations cause an increase of the noise level as well as a possible error on the flow estimation. A technique using the noise level as a criterion for making a diagnostic of the error is presented. The perturbations are examined and compared to gaussian distributed signals. A basic method for detecting gaussian perturbations with equal means is described. The likelihood ratio is first computed in the general case. It is also computed making the assumption of uncorrelated signals. Receiver Operating Characteristics (R.O.C.) are plotted. The assumption of gaussian perturbations is then investigated. Optimal thresholds are proposed for both methods and for a large interval of flow rates (from 0.4 ml/s to 0,75 1/s). Probabilities of detection and of false alarm are evaluated for both methods. It is concluded that correct detection can be performed. The optimal threshold is to be chosen by the operator.

  • 6.
    Berrebi, Jonathan
    et al.
    Luleå tekniska universitet.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Delsing, Jerker
    Reducing the flow measurement error caused by pulsations in flows2004In: Flow Measurement and Instrumentation, ISSN 0955-5986, E-ISSN 1873-6998, no 5-6, p. 311-315Article in journal (Refereed)
    Abstract [en]

    Different types of errors are generated by pulsations in flows. Among these errors is the sampling error due to a unadapted time-averaging of the flow rate. An improved model for pulsations in flows including harmonics is derived. The localization of the harmonics is performed by a detector. The period of the pulsations is estimated. It is then possible to reduce the sampling error by performing a correct averaging. The reduction of the sampling error is confirmed by simulations.

  • 7.
    Borg, Johan
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Johansson, Jonny
    van Deventer, Jan
    Delsing, Jerker
    Reciprocal operation of ultrasonic transducers: experimental results2006In: Proceedings: 2006 IEEE Ultrasonics Symposium : Vancouver, Canada, 3 - 6 October 2006, Piscataway, NJ: IEEE Communications Society, 2006, p. 1013-1016Conference paper (Refereed)
    Abstract [en]

    Ultrasonic transit-time flow-meters estimate fluid or gas flows from the difference in times of flight of upstream and downstream acoustic pulses. However, any delay differences arising from sources other than the flow to be measured will cause a troublesome "zero flow" offset error.In theory, the transducers used in the measurement system should not influence the zero flow error, as electroacoustic systems based on piezoelectric transducers have been shown to be reciprocal (when the media is stationary). However, care is required when designing the electrical interfaces for the piezoelectric transducers, if reciprocity in the system is to be utilized.This work presents technique and measurements that apply reciprocity to an ultrasonic transit-time flow-meter. Specialized electrical transducer interfaces with options to drive the transducers from either low or high impedance sources were used. Combined with a high-impedance receive mode these options made it possible to change the conditions for reciprocity in the system.We show reduced delay difference in 9 cases out of 10 when trying to utilize the reciprocal property compared to when we disregard it in favor for larger excitation energy. The delay improvements were accompanied by reduced differences between the center frequencies of the signals from the two paths.

  • 8.
    Carlson, Johan
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    IT som stöd för optimering och energimätning i fjärrvärme- och gasnät2006Conference paper (Other academic)
    Abstract [sv]

    Vid EISLAB (Embedded Internet Systems Laboratory), Luleå tekniska universitet, pågår sedan några år tillbaka ett antal projekt kopplade till energimätning. Ett projekt behandlar noggrannhet, diagnostisering och optimering av energimätningar i fjärrvärmenät. Ett annat projekt syftar till att utveckla metoder baserade på ultraljud för mätning av energiflöde och sammansättning av bio- och naturgas. Föredraget ger en sammafattning av det arbete som hittills utförts inom dessa områden samt en framåtblick över de möjligheter och fördelar resultaten från dessa projekt ger i framtiden. Inom fjärrvärmeanvändningen finns ett behov av en förbättrad mätning av energianvändningen, dels för att kunna reglera processerna och dels för att kunder och leverantörer ska betala för rätt saker. Snabb och noggrann mätning är idag inte möjligt. Ur underhållssynpunkt är det även av intresse att på distans kunna diagnosticera systemen, både på leverantörs- och kundsidan. Samma teknik kommer även att kunna användas för optimering av processen. Bio- och naturgas har utpekats som möjliga alternativ till bensin och diesel som drivmedel. De mätmetoder som finns idag för att säkerställa kvaliteten och bestämma energivärdena lämpar sig inte för användning långt ut i distributionskedjan. Målet med forskningsprojektet vid EISLAB är att utveckla en ultraljudsmetod som kan mäta sammansättning, energivärde och flöde av dessa gaser. Fokus ligger på utveckling av statistiska metoder samt fysikaliska modeller för vågutbredning i gaser. Förutom tillämpningar inom bio- och naturgas, kan tekniken även användas inom petrokemisk- och processindustri.

  • 9.
    Carlson, Johan
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Micella, M
    Luleå tekniska universitet.
    Accurate temperature estimation in ultrasonic pulse-echo systems2003In: 5th world congress on ultrasonics WCU 2003, Paris: Institut Biomedical des Cordeliers, Université Pierre et Marie Curie , 2003, p. 1565-1568Conference paper (Refereed)
    Abstract [en]

    Ultrasonic pulse-echo systems are widely used to estimate properties of liquids and gases. A common principle is to use a buffer material (buffer-rod) fixed to the ultrasound transducer. Assuming the acoustic properties of the buffer-rod are known, it is then possible to calculate the acoustic impedance of the unknown material. A problem occurs if the temperature of the buffer-rod changes during the measurements, since the properties of the buffer-rod, such as the acoustic attenuation depends on temperature. If, however, the temperature is recognized, it is possible to compensate for this. In this paper we present a method based on speed of sound changes in the buffer-rod to estimate the temperature. With the resulting model we are able to estimate temperatures in PMMA for the interval 5°C to 60°C with a 0.1 °C accuracy (at a 95% confidence level).

  • 10.
    Carlson, Johan
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Scolan, A
    Luleå tekniska universitet.
    Carlander, Carl
    Frequency and temperature dependence of acoustic properties of polymers used in pulse-echo systems2003In: Proceedings, 2003 IEEE Ultrasonics Symposium: October 5 - 8, 2003, Hilton Hawaiian Village, Honolulu, Hawaii ; an international symposium / / [ed] Donald E. Yuhas, Piscataway, NJ: IEEE Communications Society, 2003, p. 885-888Conference paper (Refereed)
    Abstract [en]

    In ultrasonic pulse-echo systems, polymers like PMMA (polymethylmethacrylate) and PEEK (polyetheretherketone) are often used as buffer-rods, placed between the ultrasound transducer and the unknown material (liquid, gas, or solid material). Provided the acoustic properties of the buffer-rods are known, it is possible to calculate these also for the unknown material, based on reflections between the buffer-rod and the unknown medium. However, temperature changes also affect these properties. In this paper we present a method for measuring acoustic attenuation, speed of sound and density, for buffer-rod materials. We also give experimental values for PMMA and PEEK, for temperatures between 5/spl deg/C and 37/spl deg/C, and for 5 MHz and 10 MHz ultrasound frequency.

  • 11.
    Delsing, Jerker
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Jomni, Yassin
    Yliniemi, Kimmo
    van Deventer, Jan
    Heat metering - not just for invoicing2006Conference paper (Other academic)
  • 12.
    Delsing, Jerker
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Micro webservers for monitoring and control in energy distribution2006Conference paper (Other academic)
    Abstract [en]

    Todays district heating and gas substations for domestic heating uses a since long time established heat metering and control technology. The measurement and control system architecture is based on a paradigm of non communicating sensors and regulators. The now evolving paradigm of sensors and actuators connected in sensor networks open for new measurements and control concepts to be used in energgy measurement and control. The sensor network approach enables the use of sensor fusion theory. Thus enabling improved measurement accuracy, improved control possibilites and estimation of interesting more parameters like tap water energy consumption etc. Further it leads to a capability of customer communication using live energy data. Using the Embedded Internet System (EIS) architecture every sensor, actuator and control box in a substation will be individually connected to the Internet. This opens for flow of data from the heat meter to the control system opening new possibilites for control and data estimation. It also opens for data from the control system to support improved heat measurement. Similar solutions can be found in the gas application. In district heating we expect improvements like, improved heat metering accuracy, maximized differanse temperature, minimized forward flow temperature, hot water energy measurement each of them having economical impact.

  • 13.
    Delsing, Jerker
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Derhamy, Hasan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Eliasson, Jens
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Varga, Pal
    Budapest University of Technology and Economics, Dept. of Telecommunications and Media Informatics, Budapest, Hungary.
    Enabling IoT automation using local clouds2016In: Proceedings IEEE World Forum on Internet of Things, Piscataway, NJ: IEEE Computer Society Digital Library, 2016, p. 501-507, article id 7845474Conference paper (Refereed)
    Abstract [en]

    Various forms of cloud computing principles and technologies are becoming important recently. This paper ad- dresses cloud computing for automation and control applications. It’s argued that the open Internet cloud idea has such limitations that its not appropriate for automation.

    Since automation is physically and geographically local, it is inevitable to introduce the concept of local automation clouds. It’s here proposed that local automation clouds should be self contained an be able to execute the intended automation func- tionalities without any external resources. Thus providing a fence at the rim of the local cloud preventing any inbound or outbound communication. Such a local cloud provides possibilities to address key requirements of both todays and future automation solutions. Adding mechanisms for secure inter-cloud administra- tion and data tranfere enables local automation cloud to meet IoT automation system requirements as: 1) Interoperability of a wide range of IoT and legacy devices 2) Automation requirement on latency guarantee/prediction for communication and control computations. 3) Scalability of automation systems enabling very large integrated automation systems 4) Security and related safety of automation systems 5) Ease of application engineering 6) Multi stakeholder integration and operations agility.

    How these requirements can be met in such a local automation cloud is discussed with references to proposed solutions. The local automation cloud concept is further verified for a compartment climate control application. The control application included an IoT controller, four IoT sensors and actuators, and a physical layer communication gateway. The gateway acted as host for local cloud core functionalities. The climate control application has successfully been implemented using the open source Arrowhead Framework and its supports for design and implementation of self contained local automation clouds.

  • 14.
    Delsing, Jerker
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Eliasson, Jens
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Johansson, Jonny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Löfqvist, Torbjörn
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Sandin, Fredrik
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Concepts and Architecture for a Thumb-Sized Smart IoT Ultrasound Measurement System2016In: IEEE Ultrasonic Symposium 2016, Piscataway, NJ: IEEE conference proceedings, 2016Conference paper (Refereed)
    Abstract [en]

    This paper presents the technology concepts for a “thumb”-sized self-contained ultrasonic IoT measurement sys- tem. An overall architecture is proposed, and key elements are discussed with solutions using existing technology, thus arguing that realization is possible with the current technology.

    Such an ultrasonic IoT measurement system is constrained by its size and available energy, although it requires at least decent computational and communication resources. Because streaming data from such a device is not advisable from an energy viewpoint, there is a need for resource efficient (energy, memory and computational power) data analysis.

    An architecture with the following parts as well as some implementation details and performance data are proposed here:

    • Energy supply, battery and super capacitor

    • Transducer excitation achieving almost zero electrical losses

    • Event detection sensor interface

    • Data aggregation using sparse approximation and learned

      feature dictionaries, adapted to resource constrained em-

      bedded systems

    • IoT communication protocols and implementations enabling

      event -based communication and System of Systems integra- tion capabilities

      The optimization of system level performance requires each subsystem to be optimized for the specific measurement situation taking into account the subsystem interdependencies. This can be performed using a combined electrical and acoustical model of the system. Here, the model allowing electronic and acoustic co-simulation using SPICE is an important tool bridging the electronic and acoustic domains. 

  • 15.
    Delsing, Jerker
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Gustafsson, Jonas
    A service oriented architecture to enable a holistic system approach to large system maintenance information2010In: The Seventh International Conference on Condition Monitoring and Machinery Failure Prevention Technologies: 22 - 24 June 2010, Ettington Chase, Stratford-upon-Avon, England ; CM 2010/MFPT 2010, Northampton: Coxmoor Publishing Co. , 2010, Vol. 2, p. 907-914Conference paper (Refereed)
    Abstract [en]

    Heavy machinery in today's process industry is equipped with an increasing number of sensors for control and maintenance purposes. Each sensor is engineered and configured for a dedicated purpose; thus, the data or information provided by each sensor is confined to a specific purpose. Changing this individual approach to a holistic approach for control, operation and maintenance allows the data to be used in new ways, such as new control strategies, operation strategies and maintenance management. The holistic approach is demonstrated for a process of continuous energy generation and distribution: district heating. The purpose-based approach is replaced with the holistic approach, which focuses on system optimization and failure detection. The system was first set up in a Simulink simulation model to capture the thermodynamic behavior of the houses attached to the district heating system. In this model, each sensor is seen as a service that can be accessed for different purposes. Model analysis in this case led to new approaches for control and maintenance of critical parts in a district heating system.The new holistic approach is realized as a service-oriented architecture (SOA)-based wireless sensor network. It is currently installed in a small part of a district heating system in Piteå, Sweden. The system utilizes a wireless sensor network with service-oriented architecture using device profile web services (DPWS). Based on the data and information provided by the SOA wireless sensor network, the system can be identified. For the district heating example, the system identification provides system parameters that can be used to improve the thermodynamic Simulink model. Thus, comparisons can be made over time to determine system degradation. Furthermore, possible maintenance actions can be modeled, which allows prediction of system performance improvements related to specific maintenance actions.

  • 16.
    Delsing, Jerker
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Yliniemi, Kimmo
    Gustafsson, Jonas
    Jomni, Yassin
    Projekt: Fjärrvärme2007Other (Other (popular science, discussion, etc.))
  • 17.
    Derhamy, Hasan
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Drozdov, Dmitrii
    Computer Science Department, Penza State University, Penza.
    Patil, Sandeep
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Eliasson, Jens
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Vyatkin, Valeriy
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Orchestration of Arrowhead services using IEC 61499: Distributed Automation Case Study2016In: Proceedings of 2016 IEEE 20th International Conference on Emerging Technologies & Factory Automation (ETFA 2016), Piscataway, NJ: IEEE Communications Society, 2016, article id 7733650Conference paper (Refereed)
    Abstract [en]

    This paper presents a novel approach to automationof flexible manufacturing systems with mechatronic intelligenceand distributed control. The mechatronic intelligence layer isimplemented using a combination of wireless sensor/actuatornetworks with service-oriented architecture, where services arelocated at the device level, as well as in local and global Cloudsfollowing the Arrowhead framework.The machine/floor level coordination is implemented using thedistributed automation architecture of IEC 61499, which is alsoused as a graphical tool for orchestration of services.The paper discusses the enablers developed in-order to combineIEC 61499 and Arrowhead and the use is illustrated ona laboratory scale flexible factory example. By integration ofIndustrial IoT with IEC 61499, we envision that large gains interms of engineering effort and system operation performancecan be made.

  • 18.
    Derhamy, Hasan
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Eliasson, Jens
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Delsing, Jerker
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    In-network Processing for Context-Aware SOA-based Manufacturing Systems2017In: Proceedings IECON 2017: 43rd Annual Conference of the IEEE Industrial Electronics Society, Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE), 2017, , p. 6p. 3460-3465Conference paper (Refereed)
    Abstract [en]

    To achieve flexible manufacturing, increasingly largeamounts of data are being generated, stored, analyzed, archivedand eventually fed back into the product life cycle. But whereis this data stored and how is it transported? Current methodsrely on centralized or federated databases to manage the datastorage. This approach has several challenges, such as collectionbottlenecks, secure retrieval, single point of failure and dataschemefragility as data heterogeneity increases. Additionally,manufacturers are finding the need to open their networks forservice based equipment suppliers. This means previous securityassumptions regarding network encryption and informationaccess-control must be re-evaluated.Proposed here is a method of in-network processing thatgathers information only where and when it is needed. Systemsbuild context at runtime by creating dynamic queries whichmake service composition. The service composition processes rawdata and presents it as information to the calling system. Thisreduces the movement of data/information and removes singlepoint collection bottlenecks. Furthermore, fine grained accesscontrol and shared trust can be granted between untrustedsystems. The proposed methods are demonstrated on a lab setupof an industrial use case.

  • 19.
    Eliasson, Jens
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Johanson, Mathias
    Alkit Communications AB.
    An ad-hoc bluetooth sensor network for automotive testing2008In: 2008 Consumer Communications and Networking Conference: [IEEE CCNC 2008] ; Las Vegas, Nevada, 10 - 12 January 2008, Piscataway, NJ: IEEE Communications Society, 2008, p. 179-180Conference paper (Refereed)
    Abstract [en]

    In this paper, the feasibility of using a sensor network for automotive testing is investigated. Testing is becoming ever more important for the car industry, where the demands for quicker time-to-market and shortened development cycles are increasing. Car testing is time consuming, and is often performed in remote rural areas. Traditional methods include wiring up a vehicle with sensors connected to a data logging device. We envision that the use of wireless sensors can drastically decrease the time required to perform a set of test cases. A sensor network based on Bluetooth was used to validate our design approach. The network supports real-time monitoring of sensor data, and precludes the need of manually configuring each sensor node. Preliminary tests indicates that the proposed design is well suited for vehicle testing, due to its inherent support for ad-hoc networking and auto configuration of services.

  • 20.
    Eriksson, Johan
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Lindgren, Per
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    A distributed engine management system for formula SAE2007In: Electronic Engine Controls: [held during the SAE 2007 world congress, April 16 - 19, 2007, Cobo Center, Detroit, MI, USA], Warrendale, Pa: Society of Automotive Engineers, Incorporated , 2007Conference paper (Refereed)
    Abstract [en]

    In this paper a distributed system for engine management is presented. The system is in use on the 2006 and 2005 Formula SAE cars from Luleå University of Technology. The purpose of building such a system from scratch is to have a comprehensive, predictable and easily extendable platform, giving the possibility to add extra features even at the racetrack. This allows the system to serve as a research platform for embedded real-time systems and vehicle dynamics. Another motivation is to get low weight on the complete system, and to integrate the electronics in such a way that the total cabling required will be minimal. The initial requirements are that the system should implement launch control, traction control, electric gear shift and clutch control. To control the engine the system must implement sequential fuel injection, direct fire ignition and closed loop lambda control. Moreover to remotely tune and monitor the system parameters in real-time - even on the racetrack, the system should facilitate wireless communication. To achieve these goals a system consisting of five units communicating over a standard automotive bus (CAN1) was developed. In this paper we will describe the systems functionality and the units developed.

  • 21.
    Fredriksson, Håkan
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Engström, Niclas
    Ash, Jeremy
    Anthony Best Dynamics Ltd.
    Automotive winter testing with path-following steering robot2015In: International Journal of Vehicle Systems Modelling and Testing, ISSN 1745-6436, E-ISSN 1745-6444, Vol. 10, no 1, p. 29-52Article in journal (Refereed)
    Abstract [en]

    When testing modern active safety systems on cars, it is essential to test vehicle response to steering inputs. This paper highlights the use of a path-following steering robot for repetitive car testing in winter conditions. Experiments have been made with commonly used test sequences, e.g., lane-change, double lane-change, constant radius circle, and handling circuit. The steering input from the human driver is replaced by a steering robot and a path-following algorithm. The main focus for this paper is to describe what happens when one pushes the path-following system to, and beyond, the physical limitations of road grip when cornering at high vehicle speed. It shows that, with an appropriate tuning of the path-following parameters, the system performs predictably and satisfactorily. The overall conclusion is that a path-following steering robot is indeed useful for repetitive test in winter conditions with poor road grip.

  • 22.
    Gustafsson, Jonas
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Delsing, Jerker
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Experimental evaluation of radiator control based on primary supply temperature for district heating substations2011In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 88, no 12, p. 4945-4951Article in journal (Refereed)
    Abstract [en]

    In this paper, we evaluate whether the primary supply temperature in district heating networks can be used to control radiator systems in buildings connected to district heating; with the purpose of increasing the ΔT. The primary supply temperature in district heating systems can mostly be described as a function of outdoor temperature; similarly, the radiator supply temperature in houses, offices and industries can also be described as a function of outdoor temperature. To calibrate the radiator control system to produce an ideally optimal radiator supply temperature that produces a maximized ΔT across the substation, the relationship between the primary supply temperature and outdoor temperature must be known. However, even if the relation is known there is always a deviation between the expected primary supply temperature and the actual temperature of the received distribution media. This deviation makes the radiator control system incapable of controlling the radiator supply temperature to a point that would generate a maximized ΔT. Published simulation results show that it is possible and advantageous to utilize the primary supply temperature for radiator system control. In this paper, the simulation results are experimentally verified through implementation of the control method in a real district heating substation. The primary supply temperature is measured by the heat-meter and is shared with the radiator control system; thus no additional temperature sensors were needed to perform the experiments. However additional meters were installed for surveillance purposes. To maintain a stable indoor temperature at times when the primary supply and outdoor temperatures deviates from their assumed relation, the radiator system flow must be controlled by an additional control-loop. The results confirms that it is possible to control the radiator system based on the primary supply temperature while maintaining comfort; however, conclusions regarding improvements in ΔT were hard to distinguish.

  • 23. Gustafsson, Jonas
    et al.
    Delsing, Jerker
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Improved district heating substation efficiency with a new control strategy2010In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 87, no 6, p. 1996-2004Article in journal (Refereed)
    Abstract [en]

    In this paper, we describe a new alternative control approach for indirectly connected district heating substations. Simulations results showed that the new approach results in an increased ΔT across the substation. Results were obtained for both ideal and non-ideal operation of the system, meaning that less water must be pumped through the district heating network, and a higher overall fuel efficiency can be obtained in the district heating power plants. When a higher fuel efficiency is achieved, the usage of primary fuel sources can be reduced. Improved efficiency also increases the effective heat transfer capacity of a district heating network, allowing more customers to be connected to an existing network without increasing the heating plant or network capacity.Also, if combined heat and power plants are used to produce the heat, the increased ΔT will result in a further improved overall fuel efficiency, as more electricity can be produced with colder cooling water.The idea behind the new control method is to consider the temperature of the water supplying the district heating substation with heat, often referred to as the primary supply temperature. This represents a logical next step, as currently, the only parameter generally taken into account or measured when controlling the temperature level of the radiator circuit is the local outdoor temperature. In this paper we show how the primary supply temperature together with thermodynamic knowledge of the building can be used to maximize the ΔT across the district heating substation.

  • 24. Gustafsson, Jonas
    et al.
    Delsing, Jerker
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Validation of a district heating substation model using a wireless sensor network approach2008Conference paper (Refereed)
    Abstract [en]

    A thermodynamic model of a detached house using district heating has been created in Mathworks Simulink to form a realistic tool to test new control methods to optimize district heating systems. We here present the experimental validation process of the model. Detailed measurements were made using high performance ultrasonic flow-meters with embedded temp sensors. The flow-meters measures e.g. total tap water consumption, total primary energy consumption and radiator energy consumption separately. We show satisfying thermodynamic results of the model versus the real house. We also show that wind and sun exposure play a role in this validation.

  • 25. Gustafsson, Jonas
    et al.
    Mäkitaavola, Henrik
    Delsing, Jerker
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Integration of an IP based low-power sensor network in district heating substations2010In: Proceedings of the 12th International Symposium on District Heating and Cooling: September 5th to September 7th, 2010, Tallinn, Estonia, Tallinn, 2010Conference paper (Refereed)
    Abstract [en]

    In this study, the implementation of a wireless, lowpower, sensor network with IP capabilities in a district heating substation was evaluated. The aim of the study was to show that an open standard solution is technically feasible. Low-power wireless communication was established using IPv6/6LoWPAN on an IEEE 802.15.4 wireless network. An experimental district heating substation was equipped with sensor platforms in vital devices located within or near a district heating substation. As a result, all connected devices could obtain a direct internet connection.A system with open standards facilitates the introduction of new energy services such as individual measurements and improved space heating control. In this study, we found that resource-limited batterypowered devices possess a life expectancy of over 10 years, using small batteries while participating in IPv6 compatible communication.

  • 26.
    Gustafsson, Jonas
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Delsing, Jerker
    Thermodynamic simulation of a detached house with district heating subcentral2008In: 2nd Annual IEEE Systems Conference, 2008: Montreal, QC, Canada, 7 - 10 April 2008, Piscataway, NJ: IEEE Communications Society, 2008, p. 485-492Conference paper (Refereed)
    Abstract [en]

    A physical thermodynamic model of a detached house connected to a low-tempered district heating network is presented. The model is created in Mathworks Simulink\textregistered\space with a pedagogic approach in mind, e.g. masked subsystems divided in to physical components. The house model is easily modified to any detached house. Provision is also made to make it scalable to multi-family houses. The district heating substation modeled is a parallel coupled plate heat exchanger, which is the most common substation in smaller buildings such as villas. The purpose of creating the model was to provide a platform for test and evaluation of new control methods for district heating system based on wireless sensor networks. Initial validation of the model is presented.

  • 27.
    Hamfelt, Jesper
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Gustafsson, Jonas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Löfqvist, Torbjörn
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Häggström, Fredrik
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Delsing, Jerker
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    A passive Barkhausen noise sensor for low-power applications2016In: 2016 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings, Piscataway, NJ: IEEE Communications Society, 2016, p. 280-284, article id 7520374Conference paper (Refereed)
    Abstract [en]

    This paper proposes a passive Barkhausen noise sensor design suitable for low power applications. The sensor uses a permanent magnet and the relative motion between itself and a measured specimen instead of the conventional method that uses a fixed sensor and an alternating magnetic field. Since this novel design is passive, the sensor is well suited for low power applications and could potentially be used in e.g. A condition monitoring system integrated into a rolling element bearing. Proof of concept testing has been performed showing that the proposed sensor produces similar results as conventional Barkhausen noise sensors when applied to specimens being cyclically loaded until failure in a rotating bending rig. The results imply that material fatigue detection using the Barkhausen noise can be performed with the proposed sensor at a fraction of the energy cost compared to a conventional sensor. This warrants future research into the development of the proposed sensor, its advantages, disadvantages, and functionality

  • 28. Jomni, Yassin
    et al.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Comparing heat measurement accuracy of a new adaptive algorithm with existing heat meters in accordance to the Swedish test standards2006In: Proceedings, 10th International Symposium on District Heating and Cooling, 2006Conference paper (Refereed)
  • 29. Jomni, Yassin
    et al.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Delsing, Jerker
    Improving heat energy measurement in district heating substations using an adaptive algorithm2004In: Proceedings of the 12th International Conference on Flow Measurement: Flomeko'04, 2004, p. 554-558Conference paper (Refereed)
  • 30. Jomni, Yassin
    et al.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Delsing, Jerker
    Model of a heat meter in a district heating substation under dynamic load2003In: Proceedings for the Nordic MATLAB Conference, 2003, p. 62-67Conference paper (Refereed)
  • 31. Jomni, Yassin
    et al.
    Yliniemi, Kimmo
    Delsing, Jerker
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Testing a new feed forward method against the Swedish standard and comparison with existing heat meters2006In: Improving Heat Measurment Accuracy in District Heating Substations, Luleå: Luleå tekniska universitet, 2006, p. 117-125Chapter in book (Other academic)
  • 32. Jomni, Yassin
    et al.
    Yliniemi, Kimmo
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Delsing, Jerker
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Architecture for internet enabled measurements in a district heating substation laboratory2005In: Proceeding AMCTM 2005, 2005Conference paper (Refereed)
    Abstract [en]

    An architecture for the energy measurement and control and monitoring at a district heating substation is propsoed. A district heating substation is comprised of a set of sensors and actuators crutial for the well being of the substation. We want to make the data from the sensors available over the internet and provide access to the control system of the district heating substation over the internet. This technology will be implemented in a district heating laboratory being constructed at Lulea ̊ University of Technology.The architecture is based on wireless sensor and actuator nodes each talking the TCP/IP Internet suite of protocols. The implementation is made with the wireless Embedded Internet System plattform MULLE that supports the TCP/IP suite of protocols. The basic architecture and means for its implementation is given. Other applications where this vision can be readily applied are for example, sports and metrology.

  • 33. Jomni, Yassin
    et al.
    Yliniemi, Kimmo
    van Deventer, Jan
    Delsing, Jerker
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Improving heat energy measurement using a feed-forward method for low power applications2004Conference paper (Refereed)
    Abstract [en]

    Heat measurement errors cause large revenue discrepancies in the district heating industry. Some of these errors are static and can be estimated using standard error analysis, but the largest error cause is the dynamic load such systems are subject to, as in the case of warm water tapping. The frequency at which heat meters estimate and update the energy is either constant or depends on the flow rate. They are often battery operated and their power consumption is proportional to their estimation frequency. Heat meters with a flow rate dependent estimation frequency are usually based on volume-flow meters. They are widely used in district heating due to their lower estimation frequency, which prolongs their battery life. Such devices are inaccurate especially at low flow rates. A Feed-forward method that measures the heat energy only when changes occur is presented in this paper.This method reduces the heat measurement error due to the dynamics of the system while minimizing the battery power consumption. The Feed-Forward method has been implemented and tested at cross-purposes with flow rate dependent heat meters in a Simulink model of a district heating substation.

  • 34.
    Kolluru, Katyayani Kiranmayee
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Paniagua, Cristina
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Eliasson, Jens
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Delsing, Jerker
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    DeLong, Rance J.
    The Open Group, Apex Plaza, Forbury Road, Reading, Berkshir.
    An AAA Solution for Securing Industrial IoT Devices using Next Generation Access Control2018Conference paper (Refereed)
    Abstract [en]

    Industry 4.0 is advancing the use of Internet of Things (IoT) devices in industrial applications, which enablesefficient device-to-device (D2D) communication. However, these devices are often heterogeneous in nature, i.e. from different manufacturers, use different protocols, etc. and adds requirements such as security, interoperability, etc.To address these requirements, the Service-Oriented Architecture-Based (SOA) Arrowhead Framework was previously proposed using the concept of local clouds. These local clouds provide a set of mandatory and support core systems to enable industrial automation applications. One of these mandatory core systems is an Authentication, Authorisationand Accounting (AAA) system, which is used to authenticate and provide access control to the devices in a local cloud. In an industrial context, with multiple stakeholders, the AAA mustsupport fine-grain access control. For example, in a distributed control loop, a controller should only have read access to its sensor such as a flow meter and write access to its actuator, such as a valve. The controller should not have access to anyother information besides what is needed to implement the desired functionality. In this work, an NGAC-based AAA solution to achieve fine-grain service level access control between IoT devices has been proposed and implemented. The solution is presented using a district heating use case.

  • 35.
    Kyusakov, Rumen
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Cragie, Robert
    Gridmerge Ltd..
    Eliasson, Jens
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Delsing, Jerker
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Emerging energy management standards and technologies: challenges and application prospects2012In: 2012 IEEE 17th Conference on Emerging Technologies & Factory Automation : (ETFA 2012): September 17-21, 2012 Krakow Poland, Piscataway, NJ: IEEE Communications Society, 2012Conference paper (Refereed)
    Abstract [en]

    The continuously rising costs and the environmental impact of energy generation, transmission and consumption are a major concern for governments, industry and society alike. Among research in renewable energy sources as well as in energy efficiency of buildings, electrical appliances, vehicles etc., a considerable amount of attention has been devoted to effective energy management. In this paper, we present a survey on emerging energy management standards with focus on enabling application layer Information and Communications Technologies (ICT) that are a central part of these standards. The presented work includes an analysis on the challenges, future trends, security and application prospects of energy management standards. As part of the survey, the emerging Open Automated Demand Response (OpenADR) version 2.0 and Smart Energy Profile (SEP) version 2.0 were identified as the most promising and complete solutions. The presented survey provides an important insight on the future developments in the area of energy management protocols and highlights a number of key ICT solutions and challenges.

  • 36.
    Kyusakov, Rumen
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Eliasson, Jens
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Delsing, Jerker
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Gustafsson, Jonas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Integration of wireless sensor and actuator nodes with IT infrastructure using service-oriented architecture2013In: IEEE Transactions on Industrial Informatics, ISSN 1551-3203, E-ISSN 1941-0050, Vol. 9, no 1, p. 43-51Article in journal (Refereed)
    Abstract [en]

    A large number of potential applications for Wireless Sensor and Actuator Networks (WSAN) have yet to be embraced by industry despite high interest amongst academic researchers. This is due to various factors such as unpredictable costs related to development, deployment and maintenance of WSAN, especially when integration with existing IT infrastructure and legacy systems is needed. Service-Oriented Architecture (SOA) is seen as a promising technique to bridge the gap between sensor nodes and enterprise applications such as factory monitoring, control and tracking systems where sensor data is used. To date, research efforts have focused on middleware software systems located in gateway devices that implement standard service technology, such as Devices Profile for Web Services (DPWS), for interacting with the sensor network. This paper takes a different approach - deploying interoperable Simple Object Access Protocol (SOAP)-based web services directly on the nodes and not using gateways. This strategy provides for easy integration with legacy IT systems and supports heterogeneity at the lowest level. Two-fold analysis of the related overhead, which is the main challenge of this solution, is performed; Quantification of resource consumption as well as techniques to mitigate it are presented, along with latency measurements showing the impact of different parts of the system on system performance. A proof-of-concept application using Mulle - a resource-constrained sensor platform - is also presented.

  • 37. Nybacka, Mikael
    et al.
    Larsson, Tobias
    Jeppsson, Peter
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Ågren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Karlsson, Lennart
    Rantatalo, Matti
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Lindgren, Per
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Andren, Henrik
    Engström, Niclas
    Larsson, Roland
    Fransson, Lennart
    Hyyppä, Kalevi
    Fredriksson, Håkan
    Eriksson, Johan
    van Deventer, Jan
    Tingvall, Bror
    Project: CASTT - Centre for Automotive Systems Technologies and Testing2007Other (Other (popular science, discussion, etc.))
    Abstract [sv]

    Through the Centre for Automotive Systems Technologies and Testing, Luleå University of Technology aims to first of all support automotive winter testing in Northern Sweden. This means to support the local automotive test entrepreneurs and through them their customers: the car manufacturers and their suppliers. To succeed in this task, the center relies on the university's areas of leading research and most importantly on the cooperation between those areas.

  • 38.
    Röijezon, Ulrik
    et al.
    Luleå University of Technology, Department of Health Sciences, Health and Rehabilitation.
    Prellwitz, Maria
    Luleå University of Technology, Department of Health Sciences, Health and Rehabilitation.
    Ahlmark, Daniel Innala
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Nikolakopoulos, George
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Hyyppä, Kalevi
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    A haptic navigation aid for individuals with visual impairments: Indoor and outdoor feasibility evaluations of the LaserNavigator2019In: Journal of Visual Impairment & Blindness, ISSN 0145-482X, E-ISSN 1559-1476, Vol. 113, no 2, p. 194-201Article in journal (Refereed)
  • 39.
    Thanos, George A.
    et al.
    Network Economics and Services Group, Athens University of Economics and Business.
    Minou, Marilena
    Network Economics and Services Group, Athens University of Economics and Business.
    Ganu, Tanuja
    IBM Research-India, Bangalore.
    Arya, Vijay
    IBM Research-India, Bangalore.
    Chakraborty, Dipanjan
    IBM Research-India, Bangalore.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Stamoulis, George D.
    Network Economics and Services Group, Athens University of Economics and Business.
    Evaluating demand response programs by means of key performance indicators2013In: 5th International Conference on Communication Systems and Networks, COMSNETS 2013, Piscataway, NJ: IEEE Communications Society, 2013Conference paper (Refereed)
    Abstract [en]

    Demand response (DR) has received significant attention in recent years and several DR programs are being deployed and evaluated worldwide. DR systems provide a wide range of economic and operational benefits to different stakeholders of the electrical power system including consumers, generators and distributors. DR can be achieved through a number of different mechanisms such as direct-load-control, incentives, pricing signals, or a combination of these schemes. Due to the remarkable variation in demand response systems, it becomes a challenge to evaluate and compare the effectiveness of different DR programs holistically. In this work, we define a number of different performance metrics that could be used to evaluate DR programs based on peak reduction, demand variation and reshaping, and economic benefits

  • 40.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Activity: Euroheat & Power R&D Workshop: High Efficiency - Improved Building Installations and Customer Comfort2006Conference paper (Other (popular science, discussion, etc.))
  • 41.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Activity: IDEA Annual Conference & Trade Show, Setting the Pace, Leading the Way2007Conference paper (Other (popular science, discussion, etc.))
  • 42.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Activity: International Conference on Advanced Mathematical and Computational Tools in Metrology, AMCTM 20052005Conference paper (Other (popular science, discussion, etc.))
  • 43.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    An ultrasonic density measurement technique: performance, thermal effects, experimental validations, and modeling1999Licentiate thesis, monograph (Other academic)
    Abstract [en]

    This licentiate thesis addresses the idea of measurement of the density of liquids using sound. The thesis can be dived into three sections: 1. An introduction that presents the need for the research and its future application into an ultrasonic mass flow meter. 2. Experimental results of an ultrasonic density probe (paper 1 and 2) which evaluate the probe's concept with liquids ranging from 750 to 1300 kg/m over temperatures extending form 0 to 40°C. Thermodynamic measurements are also presented. 3. Comparisons of experimental versus theoretically based simulation of ultrasonic systems (paper 3). The theory allows the simulation tool to predict sound generation, propagation and reception as a function of frequency and temperature. Within the thesis are three papers: 1. An Ultrasonic Density Probe. (published in IEEE Ultrasonic symposium) 2. Thermostatic and dynamic performance of a Density Probe. (submitted to IEEE Transactions on UFFC) 3. PSpice simulation of Ultrasonic Systems. (submitted to IEEE Transactions on UFFC)

  • 44.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Detection of, and compensation for error inducing thin layer deposits on an ultrasonic densitometer for liquids2003In: Proceedings of the 20th IEEE Instrumentation and Measurement Technology Conference: IMTC '03, IEEE Communications Society, 2003, p. 648-652Conference paper (Refereed)
    Abstract [en]

    A pulse echo ultrasonic densitometer can measure the acoustic impedance of a liquid by listening to the echo of an acoustic pulse reflected from the densitometer probe and liquid interface. The density of the liquid Is obtained by dividing the acoustic impedance of the liquid and the speed of sound through the liquid. However, thin layer deposits, also known as fouling, on the probe at the liquid interface Introduce errors in the assessment of the liquid's acoustic Impedance and hence in the density estimation. In this paper, we simulate the situation with different types of contaminations at different fouling layer thickness and show that when performing a discrete Fourier transform (DFT) on the echo, the presence of the contaminating layer can be detected while the correct liquid density can be estimated

  • 45.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Intelligent Industrial Processes: Systems Engineering for IIP2015Report (Other (popular science, discussion, etc.))
    Abstract [en]

    Intelligent Industrial Processes do not naturally occur, they are engineered. This is a white paper that describes the role of Systems Engineering in Intelligent Industrial Processes. We first try to get a grasp of what we mean with Intelligent Industrial Processes and Systems Engineering. The state of the art for Systems Engineering is reviewed with systems life cycle processes and Model Based Systems Engineering (MBSE). It is followed by current problems in process industry and presents MBSE as a partial solution for an industrial framework towards “Intelligent” industrial processes. The white pa- per clearly shows that a lack of consideration of Systems Engineering in industrial processes leads to a deficiency in understanding indus- trial processes and impacts its leadership. With an established need for Systems Engineering, a SWOT analysis and a triple road map for LTU is presented including potential collaborations.

  • 46.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Introduction of a 2 transducer ultrasonic mass flow meter2005In: 2005 IEEE Instrumentation and Measurement Technology Conference (IMTC): Ottawa, Ontario, Canada, 16 - 19 May 2005, Piscataway, NJ: IEEE Communications Society, 2005, p. 1369-1372Conference paper (Refereed)
    Abstract [en]

    This article presents a new ultrasonic massflow meter that has only two transducers. The mass flow is inferred from volumetric flow and density. Each of the transducers is an ultrasonic densitometer based on a design by Lynnworth. The flow is estimated by the transit time difference of the sound pulse between the up and down-stream acoustic propagation. Beyond presenting the meter, this article does looks at its signal at zero flow to address the issue of reciprocity in transit time flow meters which is in contradiction with the theory of transit time flow meters.

  • 47.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Material investigations and simulation tools towards a design strategy for an ultrasonic densitometer2001Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The purpose of the research described in the thesis has been to improve the accuracy, precision and reliability of an ultrasonic densitometer for liquids in general. Its practical application is a stand-alone device or, in combination with an ultrasonic volumetric flow meter, an all-ultrasonic mass flow meter. The work shows that the densitometer is reliable at different though steady temperatures. Changes in temperature alter the characteristics of the densitometer. Recognition of one of these alterations enables one to compensate for the thermal influence. The presence of thermal gradients in the densitometer due to thermal transients can be recognized and handled properly. A simulation tool is refined to aid in the design of the densitometer to include spectral and thermal dependencies of the sensor materials. The model described by the simulation tool is compared successfully with actual ultrasonic systems. The simulation tool is used to predict the received electrical signal of a two-transducer ultrasonic mass flow meter. The simulation tool is also used to investigate the effects of transducer variations on flow measurement errors in a volumetric flow meter. When the two transducers are not identical, there is a difference in the times of flight of the ultrasonic pulses used to calculate the flow velocity, which should not occur when the fluid is stationary. The simulation tool is based on the electronic simulation software SPICE, which aids in the design of the associated electronics. To incorporate the spectral and thermal dependencies of polymers used in the densitometer into the simulation tool, their characteristics have been explored. The superposition of frequency and temperature of their characteristics is used and parametric surfaces are proposed. The problem however is that those characteristics are not commonly found for most polymers. Signal processing techniques are applied to two densitometers for solids to illustrate the extraction of information from the measured signals as well as their drawbacks. The same signal processing methods provide the densitometer for liquids a means to achieve better accuracy, precision and reliability.

  • 48.
    van Deventer, Jan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    One dimensional modeling of a step-down ultrasonic densitometer for liquids2004In: Ultrasonics, ISSN 0041-624X, E-ISSN 1874-9968, Vol. 42, no 1-9, p. 309-314Article in journal (Refereed)
    Abstract [en]

    This article studies the possibilities and limitations of modeling a step-down ultrasonic densitometer using its electrical analogous representation. The purpose of the model is to simulate the system in order to optimize its performance. The advantage of an analogous electrical is the complete simulation of both the electrical and mechanical parts of the system. The ultrasonic densitometer and the need for the step down are presented. The analogy to the electrical representation is briefly introduced along with the step down notion. Experimental results of probes equipped with piezoceramic disk of 10 and 16 mm in diameter are shown to consider diffraction. Simulated signals from modeled probes are judged against the real signals. The limitations of the simulations are discussed. They are beam spreading, reference echo to different media and superfluous multiple reflections.

  • 49. van Deventer, Jan
    et al.
    Delsing, Jerker
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    An ultrasonic density probe1997In: Proceedings: 1997 IEEE Ultrasonics Symposium, October 5 - 8, 1997, Toronto Marriott Eaton Centre, Ontario, Canada : an international symposium / [ed] S.C. Schneider, Piscataway, NJ: IEEE Communications Society, 1997, p. 871-875Conference paper (Refereed)
    Abstract [en]

    An ultrasonic density probe for liquids using a single transducer is developed, as a first step in the design of an ultrasonic mass flowmeter. The probe is based on the reflection of sound at the probe's interface with the fluid. The amplitude of the echo from that interface indicates the characteristic acoustic impedance of the liquid. The liquid's density is the ratio of its acoustic impedance to the speed of sound through it. The latter is obtained by measuring the time necessary for the transmitted sound pulse to be echoed back from a reflector located at a known distance in the fluid. The probe consists of two buffer rods in series behind which sits a transducer. This arrangement removes any dependence on the amplitude of the initial pulse. The effects of temperature on the buffer rods' characteristics are numerically compensated for by the dependence of the measured speeds of sound on the temperature of the traveled media. Results show an accuracy of better than 1% with a 95% confidence level for water at temperatures ranging from 2 to 40°C.

  • 50.
    van Deventer, Jan
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Delsing, Jerker
    Apparent transducer non-reciprocity in an ultrasonic flow meter2002In: Ultrasonics, ISSN 0041-624X, E-ISSN 1874-9968, Vol. 40, no 1-8, p. 403-405Article in journal (Refereed)
    Abstract [en]

    This paper investigates the effects of non-identical ultrasonic transducers on reciprocity and zero-flow calibration in transit time flow meters. According to the theorem of reciprocity, there should not be any difference between the up- and downstream acoustic times of flight in a zero-flow situation. This would thus eliminate zero-flow estimation drifts. The flow meter is modeled as a one dimensional system with equivalent electrical circuits and simulated with simulation program with integrated circuits emphasis. The work shows that variations between the two transducers cause false estimates of flow and indicate which parameters have the largest influence. It indicates that reciprocity holds only for identical transducers.

12 1 - 50 of 62
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