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Andrén, Henrik
Alternative names
Publications (10 of 18) Show all publications
Engström, N., Andrén, H., Larsson, R. & Fransson, L. (2011). Direct low lateral slip roadgrip measurement compared with surface reflection of three laser beams (ed.). Paper presented at PIARC International Winter Road Congress : 08/02/2010 - 12/02/2010. Paper presented at PIARC International Winter Road Congress : 08/02/2010 - 12/02/2010.
Open this publication in new window or tab >>Direct low lateral slip roadgrip measurement compared with surface reflection of three laser beams
2011 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Infrastructure Engineering
Research subject
Machine Elements; Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-39248 (URN)de7d222b-006c-4dc1-8af1-987ca8a6b71b (Local ID)de7d222b-006c-4dc1-8af1-987ca8a6b71b (Archive number)de7d222b-006c-4dc1-8af1-987ca8a6b71b (OAI)
Conference
PIARC International Winter Road Congress : 08/02/2010 - 12/02/2010
Note
Godkänd; 2011; 20110419 (andbra)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-01-14Bibliographically approved
Fransson, L., Patil, A. & Andrén, H. (2011). Experimental investigation of friction coefficient of laboratory ice (ed.). In: (Ed.), (Ed.), Proceedings of the 21st International Conference on Port and Ocean Engineering under Arctic Conditions: . Paper presented at International Conference on Port and Ocean Engineering under Arctic Conditions : 10/07/2011 - 14/07/2011.
Open this publication in new window or tab >>Experimental investigation of friction coefficient of laboratory ice
2011 (English)In: Proceedings of the 21st International Conference on Port and Ocean Engineering under Arctic Conditions, 2011Conference paper, Published paper (Refereed)
Abstract [en]

Friction processes of rubber on ice, steel on ice and ice on ice have been investigated bymeasuring contact forces in controlled laboratory experiments. A carefully prepared ice platewas rotated at a constant speed and brought into contact with a ring on which torque andnormal load was measured. Replicas of the different types of standardized ice surfaces werestudied in microscope. Friction of rubber on ice reached a maximum value at a sliding speedof abt. 100 mm/min. At a temperature of -10°C this maximum friction coefficient decreasedwith increasing ice surface roughness. Friction of steel on ice increased with decreasing speedand no maximum value was obtained. Ice sliding on ice at low speed resulted in high frictionforces when sintering took place.

Series
Proceedings - International Conference on Port and Ocean Engineering under Arctic Conditions, ISSN 0376-6756 ; 2011
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-34696 (URN)8f75e92b-9f4e-44fa-8291-ddb704822a5a (Local ID)8f75e92b-9f4e-44fa-8291-ddb704822a5a (Archive number)8f75e92b-9f4e-44fa-8291-ddb704822a5a (OAI)
Conference
International Conference on Port and Ocean Engineering under Arctic Conditions : 10/07/2011 - 14/07/2011
Note
Godkänd; 2011; 20121116 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Engström, N., Larsson, R., Andrén, H. & Fransson, L. (2010). Direct low lateral slip roadgrip measurement compared with surface reflection of three laser beams (ed.). Paper presented at PIARC International Winter Road Congress : 08/02/2010 - 12/02/2010. Paper presented at PIARC International Winter Road Congress : 08/02/2010 - 12/02/2010.
Open this publication in new window or tab >>Direct low lateral slip roadgrip measurement compared with surface reflection of three laser beams
2010 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

Road grip on roads depend on many factors and different techniques are available to estimate available road grip. To ensure that entrepreneurs have successfully restored the road grip to an acceptable level both entrepreneurs and road keepers need tools to evaluate present road grip. Information about road grip can also be utilized directly in a vehicle if available, for systems such as ABS, traction control, etc. To evaluate a non-contact method based on three laser beams with different frequency this equipment was mounted on a car equipped with a fifth wheel behind the car. The wheel is angled about 1.5 degrees compared with the centreline of travel. A force sensor in the hub measures forces acting on a standard winter tire also mounted to the hub, this is considered to be one measurement of road grip. The main reason is to see how well one can estimate road grip with a low cost non contact device made with Laser beams in combination with a photodiode.

National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Infrastructure Engineering
Research subject
Machine Elements; Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-37758 (URN)be05fae0-e662-11de-bae5-000ea68e967b (Local ID)be05fae0-e662-11de-bae5-000ea68e967b (Archive number)be05fae0-e662-11de-bae5-000ea68e967b (OAI)
Conference
PIARC International Winter Road Congress : 08/02/2010 - 12/02/2010
Note
Godkänd; 2010; Bibliografisk uppgift: Bidragets titel på franska: Mesure de l’adhérence directe par glissement latéral faible, par rapport à la réflexion de trois faisceaux laser sur la surface; 20091211 (niceng)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-01-14Bibliographically approved
Granlund, K. & Andrén, H. (2009). Casting with a binary polymer in order to map ice surfaces (ed.). Paper presented at . Luleå: Luleå University of Technology. Department of Civil and Environmental Engineering. Division of Structural Engineering
Open this publication in new window or tab >>Casting with a binary polymer in order to map ice surfaces
2009 (English)Report (Other academic)
Abstract [en]

Tests were conducted with casting of a binary polymer on ice in low temperatures in order to map the ice surface. It had been noticed that the most useful casting material, Master Exact, took a long time to cure in extreme (-20'C) temperatures. Master Exact is a binary polymer made for dentistry, but is widely usaed in surface analysis. Laboratory experiments were conducted to deduce how curing time is affected by different temperatures.

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology. Department of Civil and Environmental Engineering. Division of Structural Engineering, 2009. p. 3
Keywords
Civil engineering and architecture - Water engineering, Samhällsbyggnadsteknik och arkitektur - Vattenteknik
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-24626 (URN)bc832670-c46b-11de-b769-000ea68e967b (Local ID)bc832670-c46b-11de-b769-000ea68e967b (Archive number)bc832670-c46b-11de-b769-000ea68e967b (OAI)
Projects
CASTT - Centre for Automotive Systems Technologies and Testing
Note
Godkänd; 2009; 20091029 (henand)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Engström, N., Andrén, H., Larsson, R. & Fransson, L. (2009). Discrepancies between longitudinal high slip and lateral low slip friction measurements on prepared ice surfaces: Paper and poster (ed.). In: (Ed.), (Ed.), Compendium of papers DVD, TRB 88th annual meeting: January 11 - 15, 2009, Washington, D.C. Paper presented at Annual meeting. Transportation Research Board (TRB) : 11/01/2009 - 15/01/2009 (pp. 1-13). Washington, DC: TRB
Open this publication in new window or tab >>Discrepancies between longitudinal high slip and lateral low slip friction measurements on prepared ice surfaces: Paper and poster
2009 (English)In: Compendium of papers DVD, TRB 88th annual meeting: January 11 - 15, 2009, Washington, D.C, Washington, DC: TRB , 2009, p. 1-13Conference paper, Published paper (Refereed)
Abstract [en]

The Swedish road administration requested that an independent organization facilitate friction tests with several types of friction measuring devices. These tests were done on the following three surfaces: macro rough and micro smooth ice, macro- and micro smooth ice and macroand micro rough ice. The objective was to evaluate lateral low slip measuring devices against traditional longitudinal high slip devices. This was done by evaluating how they measure road grip, i.e. friction differences between road surfaces and the measuring tire. Tests were performed on Lake Kakel near Arjeplog, northern Sweden on March 18th, 2008. Weather conditions were stable with ice temperatures between -4°C (24.8°F) and -3°C (26.6°F). Tests showed that changes on the ice surfaces were readily detected with all four of the lateral low slip friction measurement devices and the two longitudinal high slip devices. Friction resolutions were higher with low lateral slip devices compared to high longitudinal slip devices. The tires on the devices were of different types and are the main reason for the difference in friction resolution. One major difference was detected; the lateral low slip method measured higher friction between its regular winter tire and the macro rough, micro smooth surfacecompared to the friction on the macro- and micro rough ice. Longitudinal high slip devices measured higher friction between its industrial friction tire and macro- and micro rough ice. Capacity to measure friction in curves was only displayed by the high longitudinal slip devices.

Place, publisher, year, edition, pages
Washington, DC: TRB, 2009
Keywords
Engineering mechanics - Other engineering mechanics, Teknisk mekanik - Övrig teknisk mekanik
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Infrastructure Engineering
Research subject
Machine Elements; Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-32063 (URN)66cfd730-c46d-11de-b769-000ea68e967b (Local ID)66cfd730-c46d-11de-b769-000ea68e967b (Archive number)66cfd730-c46d-11de-b769-000ea68e967b (OAI)
Conference
Annual meeting. Transportation Research Board (TRB) : 11/01/2009 - 15/01/2009
Projects
CASTT - Centre for Automotive Systems Technologies and Testing
Note
Godkänd; 2008; Bibliografisk uppgift: DVD-ROM; 20091029 (henand)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-01-14Bibliographically approved
Engström, N., Andrén, H., Larsson, R. & Fransson, L. (2009). Stop distances for ten studless winter tires (ed.). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Stop distances for ten studless winter tires
2009 (English)Report (Other academic)
Abstract [sv]

Denna rapport innehåller stoppsträckor för tio omgångar dubbfria vinterdäck. Arbetets huvudmål är att kunna skapa en grund för vinterdäcksklassificering. Så småning om skall traffikanter kunna få relevant information om olika däckens förmåga att skapa tillräckligt väggrepp på farliga vinterväglag. Vägverket ser ett ökat behov av kunskap då dubbdäcksanvändandet kommer att minskas i framtiden.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2009. p. 43
Series
Technical report / Luleå University of Technology, ISSN 1402-1536
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Infrastructure Engineering
Research subject
Machine Elements; Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-23574 (URN)78dfc440-bfda-11de-b769-000ea68e967b (Local ID)978-91-7439-041-4 (ISBN)78dfc440-bfda-11de-b769-000ea68e967b (Archive number)78dfc440-bfda-11de-b769-000ea68e967b (OAI)
Note
Godkänd; 2009; 20091023 (niceng)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-01-10Bibliographically approved
Engström, N., Andrén, H., Nybacka, M., Fransson, L. & Larsson, R. (2008). Road grip test in Arjeplog (ed.). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Road grip test in Arjeplog
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2008 (English)Report (Other academic)
Abstract [en]

The Swedish road administration sees a need to improve the road grip estimation capacity for the Swedish road system. The challenge is to find methods to measure road grip fast and reliable. There where six different system types at the tests in Arjeplog, three continuous, two system measuring road grip through deceleration and one system based on GPS and accelerometers. Two system types used air craft runway tires. The other systems used either studded winter tires or friction winter tires. Test runs where performed and road grip where recorded for three different surface types, old system 2000 ice, polished ice and new system 2000 ice. Weather data was collected during the three days. It is clear that all systems can detect changes in road grip. It is clear that continuous systems hold an information advantage over the sequence oriented systems. For measurements of road grip on winter roads, we recommend that rubber compounds adapted for cold conditions are used, as the resolution of the road grip measurement where better. In extreme condition like on polished ice, studded winter tires increase the road grip significantly.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2008. p. 102
Series
Technical report / Luleå University of Technology, ISSN 1402-1536 ; 2008:17
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Other Engineering and Technologies not elsewhere specified Infrastructure Engineering
Research subject
Machine Elements; Functional Product Development; Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-22273 (URN)23455950-9443-11dd-a897-000ea68e967b (Local ID)23455950-9443-11dd-a897-000ea68e967b (Archive number)23455950-9443-11dd-a897-000ea68e967b (OAI)
Projects
Intelligenta inlandsvägen, CASTT - Centre for Automotive Systems Technologies and Testing
Note
Godkänd; 2008; 20081007 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-01-10Bibliographically approved
Andren, H. & Wennström, J. (2007). Analysis of replication casting of ice surfaces (ed.). In: (Ed.), (Ed.), Proceeding of the 8th International Symposium on Cold Region Development: . Paper presented at International Symposium on Cold Region Development : 25/09/2007 - 27/09/2007. : Tampere University of Technology
Open this publication in new window or tab >>Analysis of replication casting of ice surfaces
2007 (English)In: Proceeding of the 8th International Symposium on Cold Region Development, Tampere University of Technology, 2007Conference paper, Published paper (Refereed)
Abstract [en]

The microscopic analysis of an ice surface is very difficult, due to the nature of the ice. The optically transparent, brittle and very environmentally sensitive surface is hard to analyze in a manner that does not render the results useless from damage or errors in measurements.The ice surface is ill suited for contact microscopy, like Atomic Force Microscopy (AFM) or other methods of sliding a probe over the surface. Furthermore the ice surface is transparent, so even cold room optical microscopy is not feasible. Due to the vacuous atmosphere Scanning Electron Microscope (SEM) is not an option. In this paper the authors look at some casting techniques to try and reproduce the surface with a substance much better suited for optical and mechanical measurements, as well as having a longer shelf life and being easier to handle. Different evaluations have been considered, where the frequency information is used as a measure of resolution, comparing the resolution loss of different casting materials.The casting materials used are different products from the dental industry, as well as polyvinyl formvar, a dissolved polymer that is very useful for casting of ice surfaces.

Place, publisher, year, edition, pages
Tampere University of Technology, 2007
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-40442 (URN)f9604ee0-7672-11dc-824d-000ea68e967b (Local ID)978-951-758-482-1 (ISBN)f9604ee0-7672-11dc-824d-000ea68e967b (Archive number)f9604ee0-7672-11dc-824d-000ea68e967b (OAI)
Conference
International Symposium on Cold Region Development : 25/09/2007 - 27/09/2007
Projects
CASTT - Centre for Automotive Systems Technologies and Testing
Note
Godkänd; 2007; 20071009 (henand)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Nybacka, M., Larsson, T., Jeppsson, P., Ågren, A., Karlsson, L., Rantatalo, M., . . . Tingvall, B. (2007). Project: CASTT - Centre for Automotive Systems Technologies and Testing. Paper presented at .
Open this publication in new window or tab >>Project: CASTT - Centre for Automotive Systems Technologies and Testing
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2007 (Swedish)Other (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.

National Category
Other Engineering and Technologies not elsewhere specified Other Mechanical Engineering Fluid Mechanics and Acoustics Other Civil Engineering Embedded Systems Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Functional Product Development; Computer Aided Design; Engineering Acoustics; Operation and Maintenance; Embedded System; Machine Elements
Identifiers
urn:nbn:se:ltu:diva-36169 (URN)93b31871-142c-4c9c-b686-2f1d79c77faa (Local ID)93b31871-142c-4c9c-b686-2f1d79c77faa (Archive number)93b31871-142c-4c9c-b686-2f1d79c77faa (OAI)
Note

Belopp: 7 000 000,00 Euro; Publikationer: Road surface information system; Using Timber in a multi-body design environment to develop reliable embedded software; Collaboration in winter vehicle testing: real-time simulations boosting innovation opportunities; Distributed real-time vehicle validation; Vehicle validation visualization; Distribuerad simulering och visualisering av fordonsdynamik i realtid; snowBOTS: a mobile robot on snow covered ice; Analysis of replication casting of ice surfaces; Opportunities in automotive winter testing; Slippery road detection by using different methods of polarised light; Road grip test in Arjeplog; Demonstration of multi gas exhaust measurements during cold start conditions; AVL-DRIVE pre-study report; Exploring technologies for service provision in automotive winter testing; snowBOTs: Gyro guided steering of a teleoperated tractor during winter conditions; Navigation sensors for mobile robots; Circle sector expansions for on-line exploration; Signature graphs for effective localization; An autonomous vehicle for a RobotDay; A comprehensive approach to design of embedded real-time software for controlling mechanical systems; A distributed engine management system for formula SAE; Comprehensive reactive real-time programming; Embedded real-time software using TinyTimber: reactive objects in C; FIFO WiDOM: timely control over wireless links; IP over CAN: transparent vehicular to infrastructure access; TinyTimber, reactive objects in C for real-time embedded systems; Casting with a binary polymer in order to map ice surfaces; Discrepancies between longitudinal high slip and lateral low slip friction measurements on prepared ice surfaces: Paper and poster; Polarization resolved classification of winter road condition in the near-infrared region; Evaluation of tyre to road friction estimators: test methods and metrics; Angular spectral response from covered asphalt; Classification of road conditions - to improve safety; Prospective service innovation in automotive testing: beyond distributed technology; Measurements of variations in binaural transfer functions caused by displacements of sources and receivers; Examination of the variability between artificial head recordings made in different cars of the same brand and model; Renewing industry cluster developments through interregional university-industry pipelines and sensemaking; Platform independent system integration; Model development for auralization of interior tyre noise; An ad-hoc bluetooth sensor network for automotive testing; Assessment of changes in automotive sounds caused by displacements of source and listening positions; An auralization model for structure borne tyre noise based on operational data; Methods for road texture estimation using vehicle measurements; Range data in vehicle dynamic simulation; Winter test of ABD steering robot; Development of a drive cycle simulation model for hybrid powertrains; Enabling cloud-connectivity for mobile internet of things applications; Stud noise auralization; Determination of radiated sound power from an electric rear axle drive in-situ and its contribution to interior noise; Prominence of tones in electric vehicle interior noise; Mobility measurement in six DOFs applied to the hub of a car; Automotive winter testing with path-following steering robot; Evaluating ride comfort for wheelchair passengers utilizing a motionbase simulator.; A new test track for automotive squeak and rattle (S&R) detection; The influence of the acoustic transfer functions on the estimated interior noise from an electric rear axle drive; Auralization of structure-borne tire noise; Road surface status classification using spectral analysis of NIR camera images; Simplified model for light scattering from granular materials with varying moisture content; Investigation of ice surface change during vehicle testing; Model-based winter road classification; A measurement study of predicting throughput from LQI and RSSI; A measurement study for predicting throughput from LQI and RSSI; Cognitive load-control for congested Wireless Sensor Network channels; Comparison of wireless network simulators with multihop wireless network testbed in corridor environment; Sound quality evaluation of electric cars: preferences and influence of the test environment; Intelligent Road; An auralization model for structure-borne tire noise; Prominence of Different Directions of Hub Forces and Moments in Structure-Borne Tire Noise; Aktiviteter: Robotförare testas i Malå; Robotar är heta i kalla biltesterg; Status: Ongoing; Period: 17/12/2010 → …

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-01-14Bibliographically approved
Stenberg, A., Malinovskiy, D., Öhlander, B., Andren, H., Forsling, W., Engström, L.-M., . . . Baxter, D. (2005). Measurement of iron and zinc isotopes in human whole blood: preliminary application to the study of HFE genotypes (ed.). Paper presented at . Journal of Trace Elements in Medicine and Biology, 19(1), 55-60
Open this publication in new window or tab >>Measurement of iron and zinc isotopes in human whole blood: preliminary application to the study of HFE genotypes
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2005 (English)In: Journal of Trace Elements in Medicine and Biology, ISSN 0946-672X, E-ISSN 1878-3252, Vol. 19, no 1, p. 55-60Article in journal (Refereed) Published
Abstract [en]

Multi-collector inductively coupled plasma - sector field mass spectrometry was applied to the measurement of Fe and Zn isotopes in human whole blood samples. For the Fe present in the blood of healthy adults, enrichment of the lighter isotopes relative to a standard material was observed, in agreement with earlier studies. The level of fractionation was found to be lower in hemochromatosis patients exhibiting homozygous (C282Y/C282Y) mutation of the HFE gene. On the one hand, this reinforces the hypothesis that Fe fractionation in blood decreases with enhanced dietary absorption. On the other hand, this contradicts predictions made on the basis of determinations of Fe fractionation in blood samples collected from subjects characterized by milder HFE mutations. In healthy subjects, the Zn in blood is depleted in lighter isotopes, consistent with the limited number of prior observations. As for Fe, the Zn isotopic composition exhibited a tendency toward lower levels of fractionation in the blood of subjects with hereditary hemochromatosis with homozygous mutation (C282Y/C282Y) of the HFE gene. The results therefore suggest that both Fe and Zn isotopic signatures in whole blood, at least to some extent, reflect polymorphisms in the HFE gene.

National Category
Bioprocess Technology Geochemistry
Research subject
Biochemical Process Engineering; Applied Geology
Identifiers
urn:nbn:se:ltu:diva-3632 (URN)10.1016/j.jtemb.2005.07.004 (DOI)000232879100011 ()2-s2.0-24344449059 (Scopus ID)1738bcf0-0610-11dc-b09b-000ea68e967b (Local ID)1738bcf0-0610-11dc-b09b-000ea68e967b (Archive number)1738bcf0-0610-11dc-b09b-000ea68e967b (OAI)
Note
Validerad; 2005; Bibliografisk uppgift: SECOND INTERNATIONAL FESTEM SYMPOSIUM; 20070519 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
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