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  • 1.
    Atta, Khalid
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Utilization of Generic Consumer Modeling in Planning and Optimization of District Heating and Cooling Systems2018In: Proceedings of the 21st Nordic Process Control Workshop / [ed] Kurt-Erik Häggblom, 2018Conference paper (Other academic)
    Abstract [en]

    District heating and cooling (DHC) networks are large scale complex systems which aregenerally difficult to operate and optimize. The large thermal inertia in the systems leadsto long reaction times on changes at the consumer side, which means that forecasting ofconsumer behaviour is a needed tool for efficient operation. Within the European Unionmany major research project target the energy reduction on the consumption side and peakload management while maintaining customer satisfaction.The optimal operation of a DHC network can therefore be considered as an interestingarea of investigation due to a number of aspects, like (i) the vast amount of the energy that is distributed by these networks, (ii) the demand to provide a better quality of services by the operators of these networks, and (iii) compliance with new environmental regulations. In this presentation, we discuss a possible conceptual method that utilizes a simpliedstatic model of different types of consumers in the network to design a decision supportsystem that will guide the operators of the DHC network to optimally operate the networkwith different operational scenarios that include but not limited to: (i) energy consumptionminimization, (ii) economic operation, (iii) peak load reduction/shifting, and (iv) environmentally friendly operation. In its current form, the operator will be informed, while in thefuture these actions could be fully automated in a closed loop context.The DHC network in Luleå, Sweden will be used as a test case which represents a typicalmedium size network. The case has a number of properties which motivate its study likee.g. the distributed generation possibilities, the geographical distribution of the consumers,and the different types of consumers in the area. The presentation will be concluded with anoutlook on future tracks of research and development

  • 2.
    Atta, Khalid
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Hostettler, Roland
    Department of Electrical Engineering and Automation, Aalto University.
    Johansson, Andreas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Phasor extremum seeking control with adaptive perturbation amplitude2016In: 2016 IEEE 55th Conference on Decision and Control, CDC 2016, Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE), 2016, p. 7069-7074, article id 7799358Conference paper (Refereed)
    Abstract [en]

    In this paper, we propose a perturbation amplitude adaption scheme for phasor extremum seeking control based on the plant's estimated gradient. By using phasor extremum seeking instead of classical extremum seeking, the problem of algebraic loops in the controller formulation is avoided. Furthermore, a stability analysis for the proposed method is provided, which is the first stability analysis for extremum seeking controllers using adaptive amplitudes. The proposed method is illustrated using numerical examples and it is found that changes in optimum can be tracked accurately while the steady-state perturbations can be reduced significantly.

  • 3.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Industry applications of multivariable control2002Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    In the face of environmental regulations, optimization of industrial processes becomes necessary. This doctoral thesis summarizes the results of three application-driven projects in automatic control that were aimed at process optimization in the steel industry. The objective of the projects was to apply advanced control strategies to two important processes in steel making, namely pulverized coal injection (PCI) in blast furnaces and LD converters. Firstly, an LQ multivariable controller with gas leakage detection system for PCI vessels is designed and analyzed. Secondly, a foam level control system for the LD converter process using an audio signal for measurement is designed. Thirdly, it is attempted to create a single line flow control system for PCI using a video camera. In the latter two cases the conservative approach of inferring unmeasurable physical quantities from the audio and video sources is used. Moreover, all the designs are tested through implementation or experiments at the industrial plant. The control and gas leakage detection system ended up as a full-scale industrial implementation, whereas the projects comprising audio and video information is still at an experimental stage. Work with implementation and experiments pays off in experiences and further insights in the application of control theory, and reveals weaknesses and gaps in the existing theory. Thus, application-driven projects lead to practical solutions and at the same time pose new theoretical challenges. Consequently, this chain of events is favorable to both practitioners and theoreticians, and in turn stimulates the collaboration of industry and academia. Unfortunately, in many research projects this sequence is reversed which complicates technology transfer into industry. As a spin-off effect from the multivariable control project of the PCI process two topics are addressed anew. In the problem of measurement/actuator pairs assignment for decentralized control, the geometrical background of Gramian-based interaction measures is clarified. It is shown that weighted Gramian-based interaction measures can be effectively used for control structure design. In control structure improvement of multivariable control systems, it is shown that improvement potentials can be deduced from coarse models of the closed-loop system. Finally, in the projects comprising audio and video signals in control applications, it is concluded that the theory is rather undeveloped and that these sources should be treated as a multivariable system.

  • 4.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Intelligent industrial Processes: Automatic Control Perspective2014Report (Other academic)
    Abstract [en]

    Intelligent Industrial Processes is an area of excellence in research and innovation at Luleå University of Technology (LTU), which was formed to promote multi-disciplinary research and innovation relating to Process Industrial Automation, also referred to as ProcessIT. LTU has a strong track record of research in close collaboration with process industries, where research results have often found their way into products and services strengthening the industries position on the global market.For this area of excellence a road mapping study with respect to Automatic Control research was conducted and is summarized in this white paper. The study shows that current research activities in Automatic Control are very relevant to Intelligent Industrial Processes, dealing with techniques for process understanding (modeling), design and implementation of control systems, and process monitoring, only to mention some.It is concluded that the design and establishment of an Open Research and Innovation Platform is essential for collaborative and multi-disciplinary research in the area. Such a software platform will enable industry partners to more efficiently work with their industrial processes and that in close collaboration with researchers and engineering businesses. At the same time researchers and innovators will have the opportunity to test and validate their results and innovations on real-life cases, enabling a swift exploitation of results. Some key principles for this software platform are the open source, open data and open innovation principles that need to be captured in the platform.The results of that study suggest initial automatic control research activities and a time line for stepping stones towards a full scale implementation of an Open Research and Innovation Platform by 2030.

  • 5.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Method for Controlling Vehicle Steering and Vehicle Behaviour: patent pendingPatent (Other (popular science, discussion, etc.))
    Abstract [en]

    A steering system (100) and a control algorithm for vehicle servo-steering which acts so that a steering-wheel torque applied by the driver is transformed to a vehicle behaviour. The steering system (100) consists of a steering rack (124), and tie rods (125) connected to the steered wheels of the vehicle (127). The vehicle's steering wheel (120) is connected to the rack (124) via a steering column (121). The steering column (121) contains a torsion bar (128) with a torque sensor in order to measure the steering torque applied by the driver. An assistance torque is given by an actuator (115) which is controlled by a control system (110). The control system (110) contains a control algorithm which translates the steering torque applied by the driver to a reference value in the form of a yaw and/or lateral vehicle state. The servo-system is controlled so that this reference value is attained

  • 6.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Multivariable control of a pneumatic conveying system1999Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    This licentiate thesis deals with a multivariable controller of a pneumatic conveying system. The industrial process used to illustrate design, analysis and implementation of a multivariable controller is the injection of fine coal into a blast furnace. In the blast furnace process, coke is replaced by fine coal because of economical and environmental reasons. The coal mass flow to the blast furnace becomes a crucial parameter for its operation and hence a control system should be in place to maintain a constant flow. An optimal multivariable linear-quadratic controller has been designed in order to replace the conventional PI-controllers, which were not able to reach the desired control objectives. The design is analyzed by deriving the sensitivity functions of the closed loop system to noise, disturbances and uncertainties. The multivariable controller is then validated through experiments and test operation at the coal injection plant at SSAB Tunnplåt AB in Luleå, Sweden. The reached performance improvements compared with the conventional PI-controllers account for up to 80%. Finally, the controller is combined with a gas-leakage detection system to the commercially available product SafePCI, which is now installed and in operation at SSAB Tunnplåt AB in Luleå, Sweden.

  • 7.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Towards incremental control structure optimisation for process control2007In: Proceedings of the 46th IEEE Conference on Decision and Control: New Orleans, LA, 12 - 14 December 2007, Piscataway, NJ: IEEE Communications Society, 2007, p. 1832-1837Conference paper (Refereed)
    Abstract [en]

    This paper deals with the optimisation of control structures for multivariable process control systems. Incremental optimisation of control structures is the task of improving the performance of an existing control structure by incrementally introducing or removing dynamic connections in the control structure. A preliminary method for the detection of an improving structural change in an existing control structure is presented. The method is applied to the control of a pulverized coal injection process to show its validity and has proven to give good results.

  • 8.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Arvanitidis, Ioannis
    Jönsson, Per
    Department of Metallurgy, Royal Institute of Technology, Stockholm.
    Medvedev, Alexander
    Physical modelling and control of dynamic foaming in an LD-converter process2000In: Conference record of the 2000 IEEE Industry Applications Conference: thirty-fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy, 8 - 12 October 2000, Roma (Italy), Piscataway, NJ: IEEE Communications Society, 2000, Vol. 4, p. 2584-2590Conference paper (Refereed)
  • 9.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Arvanitidis, Ioannis
    Jönsson, Pär
    Kungliga tekniska högskolan, KTH.
    Medvedev, Alexander
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Physical modeling and control of dynamic foaming in an LD-converter process2001In: IEEE transactions on industry applications, ISSN 0093-9994, E-ISSN 1939-9367, Vol. 37, no 4, p. 1067-1073Article in journal (Refereed)
    Abstract [en]

    This paper deals with physical modeling and control of dynamic foaming in the LD-converter process. An experimental setup consisting of a water model, digital signal processor, and PC hardware is built and shown to be useful for studying dynamic foaming. Furthermore, a foam height estimation algorithm is presented and validated through experiments. Finally, sound signals from the LD-converter and water model are compared and similarities between them are found.

  • 10.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Arvanitidis, Ioannis
    Medvedev, Alexander
    Jönsson, Pär
    Kungliga tekniska högskolan, KTH.
    Foam level control in a water model of the LD converter process2001In: Automation in mining, mineral, and metal processing 2001: a proceedings volume from the 10th IFAC symposium, Tokyo, Japan, 4 - 6 September 2001 / [ed] Mituhiko Araki, Oxford: Published for the International Federation of Automatic Control by Pergamon , 2001Conference paper (Refereed)
    Abstract [en]

    This paper deals with estimation and control of foam level in dynamic foaming. An improved foam level estimation methodology from a microphone signal and its automatic calibration is presented. The dynamical reaction of the foam level on air lance movements is modelled using system identification. Based on the resulting mathematical model, a controller for foam level stabilisation is designed and applied to a water model, representing the LD converter process. It is shown that the foam level can be controlled using a microphone as the measurement device and air lance movement as the actuator.

  • 11.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Arvanitidis, Ioannis
    Department of Metallurgy, Royal Institute of Technology.
    Medvedev, Alexander
    Jönsson, Pär
    Kungliga tekniska högskolan, KTH.
    Foam level control in a water model of the LD converter process2001In: Elsevier IFAC Publications / IFAC Proceedings series, ISSN 1474-6670, Vol. 34, no 18, p. 273-278Article in journal (Refereed)
    Abstract [en]

    This paper deals with estimation and control of foam level in dynamic foaming. An improved foam level estimation methodology from a microphone signal and its automatic calibration is presented. The dynamical reaction of the foam level on air lance movements is modelled using system identification. Based on the resulting mathematical model, a controller for foam level stabilisation is designed and applied to a water model, representing the LD converter process. It is shown that the foam level can be controlled using a microphone as the measurement device and air lance movement as the actuator.

  • 12.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Arvanitidis, Ioannis
    Medvedev, Alexander
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Jönsson, Pär
    Kungliga tekniska högskolan, KTH.
    Foam level control in a water model of the LD converter process2003In: Control Engineering Practice, ISSN 0967-0661, E-ISSN 1873-6939, Vol. 11, no 1, p. 49-56Article in journal (Refereed)
    Abstract [en]

    This paper deals with estimation and control of foam level in dynamic foaming. An improved foam level estimation methodology from a microphone signal and its automatic calibration is presented. The dynamical reaction of the foam level on air lance movements is modelled using system identification. Based on the resulting mathematical model, a controller for foam level stabilisation is designed and applied to a water model, representing the LD converter process. It is shown that the foam level can be controlled using a microphone as the measurement device and air lance movement as the actuator.

  • 13.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Atta, Khalid
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Towards Autonomous Synthesis of Building Substation Control Loops2016In: IEEE International Conference on Smart Grid Communications (SmartGridComm) 2016, Piscataway, NJ, 2016, p. 38-44, article id 7778735Conference paper (Refereed)
    Abstract [en]

    The main contribution of this paper is to study the feasibility of an automated approach to the assessment and synthesis of control loops in substations of a district heating and cooling system. The low-level controllers in substation are usually PID-type controllers and can not easily be changed. Moreover, the tuning of these controllers is often done in an ad-hoc manner and remains in the initial tuning despite changes in the substation over their operational life. Consequently, insufficient control performance due to false tuning can be misinterpreted as a hardware issue and lead to unnecessary replacement of parts.

    In order to solve this problem, the paper proposes an approach to assess the control loop performance based on logged data from substations, and to subsequently tune the current substation controllers, when no hardware issues are detected. The approach is applied to a well-known building substation model in simulation, which indicates that the approach is feasible.

    Analysis of acquired data from a number of substations in the DHC system of Luleå Energi AB, provides evidence for the problem and how the approach can be applied in its future implementation. Moreover, a number of challenges and future work are indicated.

  • 14.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Brännström, Mattias
    Volvo Car Corporation.
    Eidehall, Andreas
    Volvo Car Corporation.
    Levin, Daniel
    Volvo Car Corporation.
    Active safety system for a vehicle and a method for operation in an active safety systemPatent (Other (popular science, discussion, etc.))
    Abstract [en]

    An active safety system (10) for a vehicle comprising: - an external object sensor system (24) arranged on a host vehicle (12), said sensor system (24) being arranged to, within a detecting range (22) of said sensor system (24), sense objects (14 - 20) external to said host vehicle (12) and generate input data relating to said objects (14 - 20), wherein said input data include an object position ((R,È rel )(t)), - a threat indicator (26) which is arranged to assign a threat level (T k (t)) to each external object (k; 14 - 20) detected by the sensor system (24); and a method run in an active safety system.

  • 15.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Brännström, Mattias
    Volvo Car Corporation.
    Jansson, Jonas
    VTI - Statens väg-och transportforskningsinstitut.
    Threat assessment for unexpected eventsPatent (Other (popular science, discussion, etc.))
    Abstract [en]

    The invention relates to an onboard warning system for a host vehicle (1), a system comprising a sensor system detecting a presence of external objects (2) within a sensor detection area (3) and an external object movement determination unit (5) arranged to determine a measure of a relative movement of said external objects to said host vehicle. The invention is characterized in that the warning system further includes: a host vehicle movement determination unit (4) arranged to determine a relative movement of said host vehicle to a ground-fixed coordinate system; a unit (6) for determination of a measure of a absolute acceleration of said external objects to said ground-fixed coordinate system by transformation of the measure of the relative movement of said external objects to said host vehicle into said ground-fixed coordinate system using the relative movement of said host vehicle determined by said host vehicle movement determination unit; and a warning signal generator (7) arranged to generate a warning signal when said measure of absolute acceleration of said external objects relative to said fixed ground acceleration system in the sensor detection area exceeds a threshold value.

  • 16.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Brännström, Mattias
    Volvo Car Corporation.
    Levin, Daniel
    Volvo Car Corporation.
    Method for determining a measure for evaluating the behaviour of a driver of a vehiclePatent (Other (popular science, discussion, etc.))
    Abstract [en]

    The invention relates to a method for determining a measure for evaluation of the behaviour of a driver of a vehicle comprising: determining the lateral position of the vehicle in relation to a lane and the state of the vehicle at a first instant (t1), determining the planned path which the vehicle would be expected follow from said first instant t1 considering the state of the vehicle at said first instant (t1), determining the planned lateral position of the vehicle in relation to a lane at a second instant (t2) being a time interval ( t PD ) after t1, if said planned path were followed, and determining a planned deviation being the difference between the planned lateral position at the second instant (t2) with the lateral position at the first instant (t1).

  • 17.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Brännström, Mattias
    Volvo Car Corporation.
    Levin, Daniel
    Volvo Car Corporation.
    Method for estimating a traffic situation: patent pendingPatent (Other (popular science, discussion, etc.))
    Abstract [en]

    The invention relates to a method for estimating a traffic situation in relation to a vehicle comprising retrieving and storing data representative of the vehicle's state and retrieving and storing data representative of the environment surrounding the vehicle at a first instant (t1), retrieving and storing data representative of the vehicle's state and retrieving and storing data representative of environment surrounding the vehicle during an estimation period ( t TS ) following said first instant (t1), and using the data retrieved during the estimation period ( t TS ) to estimate the traffic situation at the first instant (t1).

  • 18.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Castano, Miguel
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Eriksson, Tomas
    Optimation AB.
    Rönnberg, Johan
    K Algorithm Design.
    Olsson, Erik
    SCA Obbola AB.
    Ekholm, Nils-Olov
    Billerud Karlsborg AB.
    ProMoVis: a software environment for control structure selection in interconnected processes2012In: Proceedings of Reglermöte 2012, 2012Conference paper (Other academic)
  • 19.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Castano, Miguel
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Johansson, Andreas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Projekt: Metoder för strukturell optimering av styrning i massatillverkning - MeSTA2008Other (Other (popular science, discussion, etc.))
    Abstract [sv]

    Styrsystemen i bruken består av tusentals reglerloopar och det är svårt att få en helhetssyn, och förstå de komplicerade sambanden mellan de olika processtegen. Med de nya verktygen blir det möjligt att analysera strukturen och generera helhetsstrategier för optimal styrning från ved till färdig pappersprodukt.

  • 20.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Castaño Arranz, Miguel
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Moaveni, Bijan
    Control and Signaling Department, Iran University of Science and Technology.
    Perspectives and Future Directions in Control Configuration Selection (PiCCS): Workshop Notes2017Report (Other academic)
    Abstract [en]

    The PiCCS workshop took place at Luleå University of Technology on 16th and 17th of August 2017. In total 20 researcher and engineers from industry participated in the event.

    The main aim of the workshop was to bring together expert in the field of Control Configuration Selection (CCS), which is a sub-field in the research area Automatic Control, to discuss the current state of the art and identify remaining challenges in the field. The identified challenges were formulated as future directions and are summarized in this report, together with an account of the discussion during these two days.

    The workshop explored the following topics Implementing optimal operation using simple control elements, Real time optimisation approach in control structure design and benchmarking, Data driven control configuration selection, and Reconfiguration of control structures. Based on the outcome of the discussion, a group of participants proposed an invited session for the 2018 IFAC AdChem Symposium, which has been accepted at the time of the publication of this report and consists of 6 papers addressing challenges discussed during the workshop.

  • 21.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Castaño, Miguel
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Johansson, Andreas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    An Application Software For Visualization and Control Configuration Selection of Interconnected Processes2014In: Control Engineering Practice, ISSN 0967-0661, E-ISSN 1873-6939, Vol. 26, p. 188-200Article in journal (Refereed)
    Abstract [en]

    This paper presents a new application software for control conguration selection of interconnected industrial processes,called ProMoVis. Moreover, ProMoVis is able to visualize process models and process layout at the physical leveltogether with the control system dynamics. The software consists of a builder part where the visual representationof the interconnected process is created and an analyzer part where the process is analyzed using dierent controlconguration selection tools.The conceptual idea of the software is presented and the subsequent design and implementation of ProMoVis isdiscussed. The implemented analysis methods are briey described including their usage and implementation aspects.The use of ProMoVis is demonstrated by an application study on the stock preparation process at SCA Obbola AB,Sweden. The results of this study are compared with the currently used control strategy.The study indicates that ProMoVis introduces a systematic and comprehensive way to perform control congurationselection. ProMoVis has been released under the Apache Open Source license.

  • 22.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Dudarenko, Natalia
    ITMO University.
    Evaluation of two methods for reconfiguration of multivariable controllers in process control systems2012In: Proceedings of 2012 IEEE Multi-Conference on Systems and Control, Piscataway, NJ: IEEE Communications Society, 2012, p. 627-633Conference paper (Refereed)
    Abstract [en]

    In this paper two methods for the reconfiguration of multivariable decentralized controllers are evaluated for their feasibility in real life applications. As real-life case the air control system of a waste-to-energy plant in the pulp and paper industry is used. The first method is based on the factorization of the closed loop sensitivity transfer matrix and the second on degeneration factors of the closed loop system. The two candidate methods are evaluated by comparing their results with the results obtained from established interaction measures. Thereafter the reconfiguration of the control system is performed and subsequently re-assessed. The results show that both methods can be used to derive reasonable indications on how controllers can be reconfigured to achieve better performance of the closed loop system. It is also estimated that the performance of the air control system can be improved by 3% when a feed forward link is introduced in the current control structure

  • 23.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Dudarenko, Natalia
    Saint-Petersburg National Research University of Information Technologies, Mechanics and Optics.
    Reconfiguration of the air control system of a bark boiler2016In: IEEE Transactions on Control Systems Technology, ISSN 1063-6536, E-ISSN 1558-0865, Vol. 24, no 2, p. 565-577Article in journal (Refereed)
    Abstract [en]

    In this paper the problem of reconfiguration of controllers in the air control system of a bark boiler is addressed. The air control system of a bark boiler is considered as an interconnected multivariable system and the configuration of the controllers is adapted with the perspective to improve the closed loop performance of the system. The paper proposes a generic procedure for the reconfiguration of controllers using a combination of established theories together with rather recently proposed methods. The procedure is applied to a model of the air flow system, which is derived in this study. The results indicate that a significant performance improvement can be achieved by reconfiguring the control system instead of re-design the process. The improvement is quantified through theoretical assessment, simulation studies, and performance assessment of pilot tests at the bark boiler at SCA Obbola Sweden. It can be concluded that the proposed procedure is both efficient and easy to apply.

  • 24.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Eidehall, Andreas
    Volvo Car Corporation.
    Brännström, Mattias
    Volvo Car Corporation.
    Levin, Daniel
    Volvo Car Corporation.
    An object awareness determination system and a method for determining awareness of an objectPatent (Other (popular science, discussion, etc.))
    Abstract [en]

    An object awareness determination system comprising: - an external object sensor system (10) arranged on a host vehicle (14), said sensor system (10) being arranged to, within a detecting range (16) of said sensor system, sense objects (18) and generate input data relating to objects external to said host vehicle, wherein said input data include an object position (x,y), an object velocity ¦(x ,y )¦ and an object direction of movement ((x ,y )/¦(x ,y )¦) associated with each object in said detecting range (16), characterised in that said object awareness determination system further comprises; a controller (20) for determining awareness of the user to an object (22) that recently has entered the detecting range (16) of the external object sensor system, and a method for determining awareness of an object that recently has entered into a detecting range (16) of the external object sensor system

  • 25.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Eliasson, Jens
    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.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Road surface networks technology enablers for enhanced ITS2010In: 2010 IEEE Vehicular Networking Conference, VNC 2010: Jersey City, NJ ; 13-15 Dec 2010, Piscataway, NJ: IEEE Communications Society, 2010, p. 152-159Conference paper (Refereed)
    Abstract [en]

    The increased need for mobility has led to transportation problems like congestion, accidents and pollution. In order to provide safe and efficient transport systems great efforts are currently being put into developing Intelligent Transport Systems (ITS) and cooperative systems. In this paper we extend proposed solutions with autonomous on-road sensors and actuators forming a wireless Road Surface Network (RSN). We present the RSN architecture and design methodology and demonstrate its applicability to queue-end detection. For the use case we discuss the requirements and technological solutions to sensor technology, data processing and communication. In particular the MAC protocol is detailed and its performance assessed through theoretical verification. The RSN architecture is shown to offer a scalable solution, where increased node density offers more precise sensing as well as increased redundancy for safety critical applications. The use-case demonstrates that RSN solutions may be deployed as standalone systems potentially integrated into current and future ITS. RSN may provide both easily deployable and cost effective alternatives to traditional ITS (with a direct impact independent of penetration rate of other ITS infrastructures - i.e., smart vehicles, safe spots etc.) as well as provide fine grain sensory information directly from the road surface to back-end and cooperative systems, thus enabling a wide range of ITS applications beyond current state of the art.

  • 26.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Hostettler, Roland
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Bardov, Vladimir
    Obertov, Dmitrii
    Vehicle Speed Determination (Patent pending)Patent (Other (popular science, discussion, etc.))
  • 27.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Hostettler, Roland
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Distance- Spanning Technology.
    Lundberg Nordenvaad, Magnus
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Business Administration and Industrial Engineering.
    Eliasson, Jens
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Gylling, Arne
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Distance- Spanning Technology.
    Delsing, Jerker
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Mäkitaavola, Henrik
    Project: iRoad2011Other (Other (popular science, discussion, etc.))
  • 28.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Johansson, Andreas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Castano, Miguel
    Rönnbäck, Stefan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Nordin, Tilda
    SCA Obbola AB.
    Ekholm, Nils-Olov
    Billerud Karlsborg AB.
    Interactive modeling and visualization of complex processes in pulp and paper making2010Conference paper (Refereed)
    Abstract [en]

    This paper discusses a new approach to interactive modeling, visualization and analysis of complex industrial processes. A theoretical framework based on signal flow graphs for modeling and visualization is presented. Using this framework a software tool is designed, called ProMoVis, which can be used to model a process, to visualize the models together with process construction and control system, and to perform analysis regarding e.g. feasible control strategies for the process. Moreover, a case study is conducted, where ProMoVis is used to model, visualize and analyze a stock preparation plant. The results indicate that the proposed methods and tools improve work flows, increase process understanding and simplify decision making on control strategies for complex process.

  • 29. Birk, Wolfgang
    et al.
    Johansson, Andreas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Johansson, Robert
    SSAB Tunnplåt AB.
    Medvedev, Alexander
    Implementation and industrial experiences of advanced control and monitoring in coal injection2000In: Control Engineering Practice, ISSN 0967-0661, E-ISSN 1873-6939, Vol. 8, no 3, p. 327-35Article in journal (Refereed)
    Abstract [en]

    This paper summarizes the implementation and industrial experiences of a model-based control and gas-leakage detection system in a coal injection plant. It describes how advanced control and monitoring can be implemented in an industrial environment while taking human–machine interface aspects into consideration. The operation of the advanced and the conventional concept are compared regarding evaluation data, experiences and observations of operators and maintenance personnel. It is shown that the advanced control and monitoring system improves plant performance without disturbing routines in plant operation and, moreover, is positively accepted by the plant operators.

  • 30. Birk, Wolfgang
    et al.
    Johansson, Andreas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Medvedev, Alexander
    Control and gas leakage detection in a fine coal injection plant: design and experiments1998In: Automation in mining, mineral, and metal processing 1998, (MMM'98): a proceedings volume from the 9th IFAC Symposium, Cologne, Germany, 1 - 3 September 1998 / [ed] J. Heidepriem, Oxford: Pergamon Press, 1998, p. 271-276Conference paper (Refereed)
    Abstract [en]

    This paper deals with design and implementation of a combined model-based control and gas leakage detection system applied to the pulverized coal injection plant at SSAB Tunnplåt AB in Luleå, Sweden. The structure and functions of the in-house control and process monitoring system SafePCI are described. SafePCI is experimentally tested and has successfully completed two weeks test operation. The evaluation of the test operation indicate that combined model-based control and gas leakage detection is a major improvement for control systems in the process industry.

  • 31. Birk, Wolfgang
    et al.
    Johansson, Andreas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Medvedev, Alexander
    Control and gas leakage detection in a fine coal injection plant: design and experiments1998In: Elsevier IFAC Publications / IFAC Proceedings series, ISSN 1474-6670, Vol. 31, no 23, p. 271-276Article in journal (Refereed)
    Abstract [en]

    This paper deals with design and implementation of a combined model-based control and gas leakage detection system applied to the pulverized coal injection plant at SSAB Tunnplåt AB in Luleå, Sweden. The structure and functions of the in-house control and process monitoring system SafePCI are described. SafePCI is experimentally tested and has successfully completed two weeks test operation. The evaluation of the test operation indicate that combined model-based control and gas leakage detection is a major improvement for control systems in the process industry.

  • 32. Birk, Wolfgang
    et al.
    Johansson, Andreas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Medvedev, Alexander
    Model based control for a fine coal injection plant1999In: I E E E Control Systems Magazine, ISSN 0888-0611, Vol. 19, no 1, p. 33-43Article in journal (Refereed)
    Abstract [en]

    Modeling, control, and gas leakage detection in the coal injection process are discussed. It is shown that by use of model-based methods, the flow and pressure of the coal injection vessel are reliably controlled. With the new control law, the coal mass flow can be used as a control parameter for the blast furnace. High injection rates can be used and more coke substituted, This is expected to yield a cost reduction in the iron production. An experimental comparison of the conventional control unit with the one suggested in this article shows that an improvement of the process efficiency can be reached by other means than increasing the capacity of the plant

  • 33.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Johansson, Andreas
    Medvedev, Alexander
    Johansson, R
    SSAB Tunnplåt AB.
    Model-based estimation of molten metal analysis in the LD converter: experiments at SSAB Tunnplat AB in Lulea2001In: Conference record of the 2001 IEEE Industry Applications Conference: thirty-sixth IAS annual meeting ; 30 September - 4 October 2001, Hyatt Regency Hotel, Chicago, Illinois, USA, Piscataway, NJ: IEEE Communications Society, 2001, Vol. 2, p. 1349-1353Conference paper (Refereed)
    Abstract [en]

    Experiences from field tests of a model-based molten metal analysis estimation system for the LD converter process are reported. Experiments have been carried out during a six-months long period on two converters at SSAB Tunnplat AB in Lulea, Sweden. The results achieved prove the viability of the approach taken and indicate its high potential regarding estimation accuracy and robustness. It is also concluded that some further system development is necessary to enable modeling of additives and lance level before the system can be recommended for permanent installation

  • 34.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Johansson, Andreas
    Medvedev, Alexander
    Johansson, Robert
    SSAB Tunnplåt AB.
    Model-based estimation of molten metal analysis in the LD converter: experiments at SSAB Tunnplat AB in Lulea2002In: IEEE transactions on industry applications, ISSN 0093-9994, E-ISSN 1939-9367, Vol. 38, no 2, p. 565-570Article in journal (Refereed)
    Abstract [en]

    Experiences from field tests of a model-based molten metal analysis estimation system for the Linz and Donawitz converter process are reported. Experiments have been carried out during a six-month-long period on two converters at SSAB Tunnplat AB, Lulea, Sweden. The achieved results prove viability of the approach taken and indicate its high potential regarding estimation accuracy and robustness. It is also concluded that some further system development is necessary to enable modeling of additives and lance level before the system can be recommended for permanent installation

  • 35.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Marklund, Olov
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Medvedev, Alexander
    Video monitoring of pulverized coal injection in the blast furnace2001In: Conference record of the 2001 IEEE Industry Applications Conference: thirty-sixth IAS annual meeting ; 30 September - 4 October 2001, Hyatt Regency Hotel, Chicago, Illinois, USA, Piscataway, NJ: IEEE Communications Society, 2001, Vol. 2, p. 1354-1358Conference paper (Refereed)
    Abstract [en]

    A novel approach for monitoring and control of the coal powder injection in a blast furnace is presented and discussed. Image analysis of video recordings is used as a means to estimate the instantaneous coal flow. Initial experiments at the blast furnace no 3 of SSAB Tunnplat AB Lulea, Sweden, have been performed and first hand results on modelling and control of a single injection line are given

  • 36.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Medvedev, Alexander
    A note on gramian-based interaction measures2003In: Proceedings, European Control Conference: ECC 2003, 2003Conference paper (Refereed)
    Abstract [en]

    This note deals with recently developed gramian based interaction measures. The measures are used for the choice of measurement/actuator pairs for decentralized control, where the controller remains unspecified. The theoretical background of these measures is clarified and a geometrical interpretation is given. Moreover, a generalization of the Hankel interaction index array to different gramian based system norms is proposed and it is shown that the introduction of weighted gramians makes the criteria more flexible and superior compared to the augmenting with additional filter dynamics. Finally, some examples are given to illustrate the usefulness of the generalized measures.

  • 37.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Medvedev, Alexander
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Pressure and flow control of a pulverized coal injection vessel1997In: Proceedings of the 1997 IEEE International Conference on Control Applications: October 5 - 7, 1997, Sheraton Hartford Hotel, Hartford, Connecticut, USA, Piscataway, NJ: IEEE Communications Society, 1997, p. 127-132Conference paper (Refereed)
    Abstract [en]

    Deals with model-based pressure and flow control of a fine coal injection vessel for the use of the blast furnace injection process. By means of system modeling and identification, the structure and behavior of the coal injection vessel are analyzed. It is shown that by use of model-based design, the control goals can be reached and the control performance can be significantly improved compared to the conventional PI-controllers. Several dynamic models of the plant are developed. A number of control strategies are presented and compared by means of practical tests. The LQG design method is used to design the controllers. All the controllers are validated through experiments on the coal injection plant at SSAB Tunnplat in Lulea, Sweden

  • 38.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Medvedev, Alexander
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Pressure and flow control of a pulverized coal injection vessel2000In: IEEE Transactions on Control Systems Technology, ISSN 1063-6536, E-ISSN 1558-0865, Vol. 8, no 6, p. 919-929Article in journal (Refereed)
    Abstract [en]

    This paper deals with model-based pressure and flow control of a fine coal injection vessel for the use of the blast furnace process. A control system should be in place to maintain a constant coal mass flow from the injection vessel to the blast furnace, since irregularities in the coal mass flow cause significant variations in the hot metal quality. By means of system modeling, the structure and behavior of the coal injection vessel are analyzed. It is shown that by use of a model-based design, the control objectives can be reached and the control performance can be significantly improved compared to the proportional integral (PI) controllers. Alternative control strategies are discussed and compared with the conventional design. The linear quadratic Gaussian (LQG) design method is used to design a multi-input multi-output (MIMO) controller which is validated through experiments on the coal injection plant at SSAB Tunnplat, Lulea, Sweden.

  • 39.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Medvedev, Alexander
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Sensitivity analysis of an LQ optimal multivariable controller for a fine coal injection vessel1999In: Conference record of the 1999 IEEE Industry Applications Conference: fourth IAS annual meeting, 3 - 7 October 1999, Hyatt Regency, Phoenix, Arizona, USA, Piscataway, NJ: IEEE Communications Society, 1999, p. 1322-1328Conference paper (Refereed)
    Abstract [en]

    This paper deals with a sensitivity analysis of an LQ optimal multivariable controller for a fine coal injection vessel used in the blast furnace process. The multivariable controller from a previous work is briefly presented and the closed loop system is studied by means of a sensitivity analysis. Effects of disturbances and uncertainty on the closed loop system are studied based on analysis of the singular values of the sensitivity and the complementary sensitivity functions, the relative gain array and the minimized condition numbers. Finally, the sensitivity analysis is validated by the use of logged data from test operation at the coal injection plant at SSAB Tunnplat Lulea, Sweden

  • 40.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Medvedev, Alexander
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Sensitivity analysis of an LQ optimal multivariable controller for a fine coal injection vessel2000In: IEEE transactions on industry applications, ISSN 0093-9994, E-ISSN 1939-9367, Vol. 36, no 3, p. 871-876Article in journal (Refereed)
    Abstract [en]

    This paper deals with a sensitivity analysis of a linear quadratic optimal multivariable controller for a fine coal injection vessel used in the blast furnace process. The multivariable controller from a previous work is briefly presented and the closed-loop system is studied by means of a sensitivity analysis. Effects of disturbances and uncertainty on the closed-loop system are studied based on analysis of the singular values of the sensitivity and the complementary sensitivity functions, the relative gain array, and the minimized condition numbers. Finally, the sensitivity analysis is validated by the use of logged data from test operation at the coal injection plant at SSAB Tunnplat AB, Lulea, Sweden

  • 41.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Medvedev, Alexander
    Marklund, Olov
    Video monitoring of pulverized coal injection in the blast furnace2002In: IEEE transactions on industry applications, ISSN 0093-9994, E-ISSN 1939-9367, Vol. 38, no 2, p. 571-576Article in journal (Refereed)
    Abstract [en]

    A novel approach to monitoring and control of the coal powder injection in a blast furnace is presented and discussed. Image analysis of video recordings is used as a means to estimate the instantaneous coal flow. Initial experiments at blast furnace number 3 of SSAB Tunnplat AB, Lulea, Sweden, are reported and firsthand results on modeling and control of a single injection line are given.

  • 42.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    On the design of cooperative road infrastructure systems2008In: Reglermöte 2008: proceedings / [ed] Thomas Gustafsson; Wolfgang Birk; Andreas Johansson, Luleå: Luleå tekniska universitet, 2008Conference paper (Other academic)
    Abstract [en]

    This paper discusses the design of cooperative road infrastructure systems for infrastructure-based driving support functions. The background of such systems is mapped out and it is shown that there is a need for a cross disciplinary approach. Using an example of a support function, namely the overtaking support, it is shown that such a system is feasible. The different challenges and technological problems that are identified are given and the future work is indicated.

  • 43.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Eliasson, Jens
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    iRoad - cooperative road infrastructure systems for driver support2009In: 16th World Congress and Exhibition on Intelligent Transport Systems 2009: 16th ITS World Congress ; Stockholm, Sweden, 21 - 25 September 2009, Red Hook: Curran Associates, Inc., 2009Conference paper (Refereed)
    Abstract [en]

    This paper discusses the design and implementation of a cooperative road infrastructure systems, which uses an intelligent road surface. Using an overtaking assist feature as an example it is shown how such a feature can be designed and implemented on a road infrastructure and integrated with drivers and passengers using IMS. The feasibility of this feature is assessed from a functional and communication perspective. Moreover, first results from real-life tests on the Swedish highway E4 are presented which motivate the next research and development steps.

  • 44.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Hesler, Alban
    NEC.
    Modular design and performance ranking of communication protocols2009Report (Other academic)
    Abstract [en]

    In this deliverable we present a systematic approach towards designing modularized protocols and rank a contribution of their components to the overall system performance. In the nutshell, this approach is based onthree steps: 1.) identifying adjustable parameters in existing protocols, 2.) ranking their influence on the system-level performance metrics and 3.) defining protocol modules exposing the parameters of the highest rank. To this end we present the definition of the components for constructing MAC protocols based on ranking of the impact of adjustable parameters on the overall system performance. We also overview a ranking method for functional blocks of protocols on the routing layer.

  • 45.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Ritter, Yvonne
    TWT GmbH Science & Innovation.
    Linder, Nicklas
    TWT GmbH Science & Innovation.
    Odefey, Ulrich
    TWT GmbH Science & Innovation.
    Lingman, Peter
    Optimation AB.
    Chandan, Vikas
    IBM India.
    OPTI-Sim: co-simulation based virtualization of large scale DHC-networks2016Conference paper (Refereed)
  • 46.
    Brännström, Mattias
    et al.
    Volvo Car Corporation.
    Levin, Daniel
    Volvo Car Corporation.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Grante, Christian
    Volvo Car Corporation.
    Jansson, Jonas
    VTI - Statens väg-och transportforskningsinstitut.
    Hultén, Johan
    Modelon AB.
    Rear end collision mitigation system for an automotive vehicle: patent pendingPatent (Other (popular science, discussion, etc.))
    Abstract [en]

    The present invention relates to a system (1) and method for autonomous rear impact mitigation in a host vehicle (2) having a brake system (4) and a steering system (5). The relative motion parameters between the host vehicle (2) and a second vehicle (11) behind the host vehicle (2) are established. While the host vehicle (2) has a positive velocity, the brake system (4) of the host vehicle (2) is selectively activated based on the determined relative motion parameters.

  • 47.
    Cancila, Daniela
    et al.
    CEA France.
    Nuzzo, Valeria
    ECE France.
    Stoycheva, Milena
    University of Trento, Italy.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Asplund, Fredrik
    KTH Royal Institute of Technology.
    Torngren, Martin
    KTH Royal Institute of Technology.
    Experiences and reflections on three years of CPS Summer schools within EIT Digital2016In: WESE '16: Proceedings of the 2016 Workshop on Embedded and Cyber-Physical Systems Education, New York: ACM Digital Library, 2016, article id 7Conference paper (Refereed)
    Abstract [en]

    This article provides an overview of current European Commission effort in term of educational innovation to reduce the gap between research and industry which still is a barrier to the economic development. Entrepreneurial innovation & education driving Europe's digital transformation (EIT Digital for short) is an European-based initiative fostering I&E (innovation and entrepreneurship) by integrating education, research and business at different educational levels. For instance in EIT master programmes, students work together with industries and academics to have a faster go-to-market of research results. Summer schools are part of the master programs; three of them have been organised related to CPS (cyber-physical systems), critical infrastructure and, more recently, Industry 4.0. Past and present events are discussed and the experience from these events is reported. It is further analysed how the general setup of the summer school program is affecting the educational aspects and achievement of the intended learning outcomes.

  • 48.
    Carlson, Johan
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Martinsson, Pär-Erik
    Löfqvist, Torbjörn
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Håkansson, Mikael
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Castano, Miguel
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Linder, Tomas
    Projekt: SCOPE Norra2011Other (Other (popular science, discussion, etc.))
    Abstract [sv]

    SCOPE Norra är ett samarbetskonsortium för forskning och utveckling tillsammans med massa- och pappersindustrin i Norrbotten och Västerbotten. Projektet koordineras av centrumbildningen ProcessIT Innovations.Inom SCOPE Norra pågår ett flertal delprojekt, uppdelat på ett antal fokusområden.Huvudfinansiär för konsortiet är Tillväxtverket genom medel från EU:s strukturfonder.

  • 49.
    Castano, Miguel
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    A new approach to the dynamic RGA analysis of uncertain systems2008In: 2008 IEEE International Symposium on Computer-Aided Control System Design: [CACSD] ; San Antonio, TX, 3 - 5 September 2008, Piscataway, NJ: IEEE Communications Society, 2008, p. 365-370Conference paper (Refereed)
    Abstract [en]

    This paper deals with DRGA analysis for uncertain systems. Uncertainties in a process model can be translated into uncertainties in the DRGA which might invalidate the decision on the variable paring in decentralized control. Bounds for the uncertainties in the DRGA of a multivariable process are derived for a given nominal process model with known uncertainty region. The resulting uncertainty region for the DRGA is used to assess the validity of decisions based on the nominal DRGA. The methodology for the computation of the bounds is currently restricted to the 2-by-2 case. Beside an explanatory example, a case study on a coal injection vessel is conducted and discussed.

  • 50.
    Castano, Miguel
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Bounds on a gramian-based interaction measure for robust control structure selection2011In: 2011 9th IEEE International Conference on Control and Automation (ICCA 2011): Santiago, Chile, 19 - 21 December 2011, Piscataway, NJ: IEEE Communications Society, 2011, p. 88-93Conference paper (Refereed)
    Abstract [en]

    This paper reviews a method for approximating the bounds on a gramian-based Interaction Measure (IM) for systems described by uncertain parametric models. The considered IM is the Participation Matrix. The reviewed method is based on analyzing the uncertainty in the area enclosed by the Nyquist curve. Conditions for the exactitude of this method are derived, and implementation issues are discussed.

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