Blar i Scientific Publications in Engineering Sciences på forfatter "Robbersmyr, Kjell G."
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A data-based approach for modeling and analysis of vehicle collision by LPV-ARMAX models
Lu, Qiugang; Karimi, Hamid Reza; Robbersmyr, Kjell G. (Journal article; Peer reviewed, 2013)Vehicle crash test is considered to be the most direct and common approach to assess the vehicle crashworthiness. However, it suffers from the drawbacks of high experiment cost and huge time consumption. Therefore, the ... -
A fuzzy logic approach to modeling a vehicle crash test
Pawlus, Witold; Karimi, Hamid Reza; Robbersmyr, Kjell G. (Journal article; Peer reviewed, 2012)This paper presents an application of fuzzy approach to vehicle crash modeling. A typical vehicle to pole collision is described and kinematics of a car involved in this type of crash event is thoroughly characterized. The ... -
A review on approaches for condition based maintenance in applications with induction machines located offshore
Cibulka, Jaroslav; Ebbesen, Morten K.; Hovland, Geir; Robbersmyr, Kjell G.; Hansen, Michael R. (Journal article; Peer reviewed, 2012)This paper presents a review of different approaches for Condition Based Maintenance (CBM) of induction machines and drive trains in offshore applications. The paper contains an overview of common failure modes, monitoring ... -
Deformation measurement of circular steel plates using projected fringes
Gåsvik, Kjell J.; Robbersmyr, Kjell G.; Vadseth, Trond; Karimi, Hamid Reza (Journal article; Peer reviewed, 2013)Fringe projection is a versatile method for mapping the surface topography. In this paper, it is used to measure the deformation of steel plates under static penetration. Here, the surface shape changes continuously. ... -
Development of lumped-parameter mathematical models for a vehicle localized impact
Pawlus, Witold; Karimi, Hamid Reza; Robbersmyr, Kjell G. (Journal article; Peer reviewed, 2011)In this paper, we propose a method of modeling for vehicle crash systems based on viscous and elastic properties of the materials. This paper covers an influence of different arrangement of spring and damper on the models’ ... -
Further Results on Mathematical Models of Vehicle Localized Impact
Pawlus, Witold; Nielsen, Jan Eivind; Karimi, Hamid Reza; Robbersmyr, Kjell G. (Chapter; Peer reviewed, 2010)In this paper, we propose a method of modeling for vehicle crash systems based on viscous and elastic properties of the materials. This paper covers an influence of different arrangement of spring and damper on the models? ... -
Influence of unloading modes of spring-mass-damper models on vehicle to pole collision simulation results
Karimi, Hamid Reza; Pawlus, Witold; Robbersmyr, Kjell G. (Chapter; Peer reviewed, 2011)Our intention, in this brief note, is to investigate what influence the viscoelastic models' unloading properties have on models' accuracy of representing vehicle crash event. Two types of simple spring-mass-damper systems ... -
Investigation of vehicle crash modeling techniques: theory and application
Pawlus, Witold; Karimi, Hamid Reza; Robbersmyr, Kjell G. (Journal article; Peer reviewed, 2013)Creating a mathematical model of a vehicle crash is a task which involves considerations and analysis of different areas which need to be addressed because of the mathematical complexity of a crash event representation. ... -
Mathematical modeling and parameters estimation of a car crash using data-based regressive model approach
Pawlus, Witold; Robbersmyr, Kjell G.; Karimi, Hamid Reza (Journal article; Peer reviewed, 2011)n this paper we present the application of regressive models to simulation of car-to-pole impacts. Three models were investigated: RARMAX, ARMAX and AR. Their suitability to estimate physical system parameters as well as ... -
Mathematical modeling and parameters estimation of car crash using eigensystem realization algorithm and curve-fitting approaches
Munyazikwiye, Bernard B.; Karimi, Hamid Reza; Robbersmyr, Kjell G. (Journal article; Peer reviewed, 2013)An eigensystem realization algorithm (ERA) approach for estimating the structural system matrices is proposed in this paper using the measurements of acceleration data available from the real crash test. A mathematical ... -
Mathematical modeling of a vehicle crash test based on elasto-plastic unloading scenarios of spring-mass models
Pawlus, Witold; Karimi, Hamid Reza; Robbersmyr, Kjell G. (Journal article; Peer reviewed, 2011)This paper investigates the usability of spring which exhibit nonlinear force-deflection characteristic in the area of mathematical modeling of vehicle crash. We present a method which allows us to obtain parameters of the ... -
Mathematical modeling of a vehicle crash test based on elasto-plastic unloading scenarios of spring-mass models
Pawlus, Witold; Karimi, Hamid Reza; Robbersmyr, Kjell G. (Journal article; Peer reviewed, 2010)This paper investigates the usability of spring which exhibit nonlinear force-deflection characteristic in the area of mathematical modeling of vehicle crash. We present a method which allows us to obtain parameters of the ... -
Mixed Fault Classification of Sensorless PMSM Drive in Dynamic Operations Based on External Stray Flux Sensors
Attestog, Sveinung; Senanayaka, Jagath Sri Lal; Van Khang, Huynh; Robbersmyr, Kjell G. (Peer reviewed; Journal article, 2022)This paper aims to classify local demagnetisation and inter-turn short-circuit (ITSC) on position sensorless permanent magnet synchronous motors (PMSM) in transient states based on external stray flux and learning classifier. ... -
Oil whip-induced wear in journal bearings
Robbersmyr, Kjell G.; Olsen, Herman; Karimi, Hamid Reza; Tønder, Kristian (Journal article; Peer reviewed, 2014)This paper investigates the effect of oil whirl and oil whip in fluid film radial bearings due to possible metallic contact. The degree of metallic contact and thereby wear and tear between rotating shafts and bearing ... -
Online dimensional control of rolled steel profiles using projected fringes
Gåsvik, Kjell J.; Robbersmyr, Kjell G.; Vadseth, Trond (Journal article; Peer reviewed, 2020) -
Signal analysis and performance evaluation of a vehicle crash test with a fixed safety barrier based on Haar wavelets
Karimi, Hamid Reza; Robbersmyr, Kjell G. (Journal article; Peer reviewed, 2011)This paper deals with the wavelet-based performance analysis of the safety barrier for use in a full-scale test. The test involves a vehicle, a Ford Fiesta, which strikes the safety barrier at a prescribed angle and speed. ... -
The harp: a vehicle crash test apparatus for full-scale crash test experiments
Johnsen, J. S.; Karimi, Hamid Reza; Robbersmyr, Kjell G. (Journal article; Peer reviewed, 2012)The current paper describes an apparatus for full-scale vehicle crash test experimentation. This apparatus is referred to as the harp. In brief, the harp may either accelerate a trolley which is impacted into a test vehicle ... -
The performance investigation of viscoelastic hybrid models in vehicle crash event representation
Pawlus, Witold; Robbersmyr, Kjell G.; Karimi, Hamid Reza; Fanghol, Arnfinn (Chapter; Peer reviewed, 2011)This paper presents application of physical models composed of springs, dampers and masses joined together in various arrangements to simulation of a real car collision with a rigid pole. Equations of motion of those systems ... -
The performance investigation of viscoelastic hybrid models in vehicle crash event representation
Pawlus, Witold; Robbersmyr, Kjell G.; Karimi, Hamid Reza; Fanghol, Arnfinn (Chapter; Peer reviewed, 2011)This paper presents application of physical models composed of springs, dampers and masses joined together in various arrangements to simulation of a real car collision with a rigid pole. Equations of motion of those systems ...