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  • 1.
    Berghuvud, Ansel
    et al.
    Luleå tekniska universitet.
    Stensson, Annika
    Luleå tekniska universitet.
    Consequences of nonlinear characteristics of a secondary suspension in a three-piece freight car bogie2001In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 36, no 1, p. 37-55Article in journal (Refereed)
    Abstract [en]

    Mechanical systems with nonlinear characteristics can show a complex dynamic behavior that should be taken into account when analysing dynamic performance and reliability. The dynamic behavior of the main suspension in a three-piece freight car bogie with constant friction damping is considered in this work. The aim is to investigate the vertical behavior of a specific suspension design due to different driving conditions, weather and wear of the friction wedges. A variation in weather and wear is represented by different friction configurations in the model of the suspension. Models of different levels of detail that are based on experimental data on existing designs are developed. It is found that the suspension performance is very sensitive to variations of the friction configuration and this indicates a possible presence of nonlinear dynamic phenomena at in service like conditions

  • 2.
    Berghuvud, Ansel
    et al.
    Luleå tekniska universitet.
    Stensson, Annika
    Luleå tekniska universitet.
    Dynamic behaviour of ore wagons in curves at Malmbanan1998In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 30, no 3-4, p. 271-284Article in journal (Refereed)
    Abstract [en]

    The transportation of ore can be made more cost efficient by use of bigger and heavier trains. An increase in axle load is thereby wanted. The fleet of ore wagons of today at Malmbanan/Ofotbanan in northern Sweden and Norway has to be updated. It is of interest to find out if it is possible to allow a higher axle load on the track with new wagons. To be able to understand and predict the effects on track wear depending on what type of vehicle that is in use, the contact forces between wheels and rails have to be determined. A computer aided analysis has been made of the dynamic behaviour of three test vehicles equipped with different types of three-piece bogies running at Malmbanan. The vehicles are modelled and their interaction with the track is analyzed using the multibody simulation package GENSYS. The simulations show that, even if the axle load is increased from 25 tons to 30 tons and the velocity is increased from 50 km/h to 60 km/h, it is possible to reduce lateral track forces and wear in curves by using a different bogie than the standard three-piece bogie used today

  • 3.
    Drugge, Lars
    et al.
    Luleå tekniska universitet.
    Larsson, Tobias
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Innovation and Design.
    Stensson, Annika
    Luleå tekniska universitet.
    Modelling and simulation of catenary-pantograph interaction2000In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 33, no suppl, p. 490-501Article in journal (Refereed)
    Abstract [en]

    Modelling and simulation of the dynamic behaviour of catenary-pantograph interaction is an important part when assessing the capability of a current collection system for railway traffic. The large variation in infrastructure characteristics in different countries and railway companies, different types of traffic, designs of pantographs etc. makes it almost impossible to develop a final simulation model of such a system. Instead, it would be favourable to have a tool that has the ability to set up models of such systems, choose relevant detail of the models, run simulations and finally visualize the results. To make the tool useful for engineers, design experts as well as simulation experts, the functionality of the tool must be worked out. Aspects on computer simulation such as developed models, simulation methods and computer tools are presented. The aim is to develop a scenario that considers different designs, models, solution methods and user levels. The scenario focuses on how to structure the use of simulation of dynamics in catenary-pantograph development. A scenario is sketched built on different user levels, a modular structure and a structure for information management

  • 4. Jonsson, Mikael
    Simulation of dynamical behaviour of a front wheel suspension1991In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 20, no 5, p. 269-281Article in journal (Refereed)
    Abstract [en]

    A MacPherson front wheel suspension and its components are modelled with the finite element method. Nonlinearities due to both the geometry and the characteristics of the components (springs, dampers and bushings) are considered. The force due to a given compression/elongation of the spring strut is calculated and compared with experimental results. Kinematical results, change in track width and camber angle, are also shown and compared with experimental results. Good agreement between numerical and experimental results is obtained.

  • 5.
    Karlsson, Lennart
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Boman, Per-Olof
    Transient dynamic analysis of a linear model of a bus1987In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 16, no 2, p. 75-89Article in journal (Refereed)
    Abstract [en]

    Transient analysis of a linear model of a bus was performed. In the experiment the right front wheel of the bus rolled over a bump and one acceleration, two axial forces in the wheel suspension and two bending moments in the frame of the bus were measured. The different parts of the bus were modeled by uniform Rayleigh-Timoshenko beams and rigid bodies. This beam element has a uniformly distributed stiffness, inertia and viscous and/or hysteretic damping along its axis. The loading of the bus due to the bump was in the theoretical analysis modeled by a prescribed transient displacement of the model of the wheel. The fast Fourier transform technique was utilized. Fairly good agreement between calculated and measured values was obtained.

  • 6.
    Lesser, Martin
    et al.
    Luleå tekniska universitet.
    Karlsson, Lennart
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Drugge, Lars
    Luleå tekniska universitet.
    Interactive model of a pantograph-catenary system1996In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 28, no suppl 1, p. 397-412Article in journal (Refereed)
    Abstract [en]

    The overhead electrification system for high speed trains is modeled by a three degree of freedom pantograph and an infinite homogeneous and elastically supported beam. Travelling wave solutions for the beam with a moving load are used to derive an equivalent stiffness for the pantograph model. The model is new in that it takes account of transverse motion due to catenary zig-zag effects. Finite element solutions are also obtained for the moving load problem. The results show that transverse zig-zag effects are the primary expected motion in this system. The calculations also show the expected importance of critical wave speeds in these systems

  • 7.
    Stensson, Annika
    et al.
    Luleå tekniska universitet.
    Asplund, Christer
    Karlsson, Lennart
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    The non-linear behaviour of a MacPherson strut wheel suspension1994In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 23, no 1, p. 85-106Article in journal (Refereed)
    Abstract [en]

    Three nonlinear models of a MacPherson strut wheel suspension have been studied. The nonlinearities considered are due to the nonlinear geometrical effects in the mechanism, the amplitude limitation due to the bumpstop, the progressive stiffness of the bumpstop and the different damping coefficients for the shock absorber in bump and rebound. The models have been derived according to physical parameter values of. the MacPherson strut wheel suspension of the car SAAB 9.000. The most suitable model was further studied with special attention to nonlinear phenomena. For harmonic forcing the system had phenomena such as multiple solutions and subharmonics. For some parameter values the solution was very sensitive to changes in the integration tolerances in the numerical integration routine. No chaotic steady state solutions were found for the parameter values studied

  • 8.
    Stensson, Annika
    et al.
    Luleå tekniska universitet.
    Berghuvud, Ansel
    Bergman, E.
    Main suspension dynamics in a three-piece bogie2000In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 33, no Suppl 1Article in journal (Refereed)
  • 9.
    Stensson, Annika
    et al.
    Luleå tekniska universitet.
    Larsson, Tobias
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Innovation and Design.
    Merkt, Thomas
    Porsche AG.
    Schuller, J.
    BMW AG.
    Williams, R.A.
    Jaguar, Whitley, Coventry.
    Mauer, L.
    INTEC GmbH.
    Industry demands on vehicle development: methods and tools2000In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 33, no Suppl, p. 202-213Article in journal (Refereed)
    Abstract [en]

    A very important goal of mechatronics in system development is the integration of mechanical, electronic and software subsystems in order to increase functionality, minimize weight, and reduce production costs. In this work, industry demands on methods and tools for mechatronic vehicle development are addressed from the current product development in industry. The development of a mechatronic car door concept and dynamic stability control are used as examples to identify strong and weak parts of the current processes. Railway vehicle development aspects are also discussed. It is shown that a very important aspect for a successful mechatronic design is co-operation in an interdisciplinary design team. In terms of design methodology, the systematic identification of mechatronic potential based on function analysis is a main issue. Computer tools and technology for concept simulation, co-simulation, managing of models with different complexity as well as model exchange are identified as important demands for future effective development of mechatronic vehicles.

  • 10.
    Yagi, T.
    et al.
    Kungliga tekniska högskolan, KTH.
    Stensson, Annika
    Luleå tekniska universitet.
    Hardell, Christian
    Luleå tekniska universitet.
    Simulation and Visualisation of the Dynamic Behaviour of an Overhead Power System with Contact Breaking1996In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 25, no 1, p. 31-49Article in journal (Refereed)
    Abstract [en]

    For high speed rail traffic it is necessary to design overhead power systems which minimize the contact loss between pantograph head and contact wire. To predict how different design solutions will behave it is favourable to model and simulate the dynamic behaviour. In this paper a model of an overhead power system is specified and used in simulation. The model is suitable for simulation with contact loss since it includes specifications of impact conditions between pantograph head and contact wire. Two sets of equations of motion are specified, one for the contact case and one for the non-contact case. The model also includes lateral movement of the wire due to the zigzag span and friction between the pantograph head and the contact wire. It is shown how to make animations of the system behaviour using a MCAE-system. The animations are made using a geometrical model of the system together with results from numerical simulations. Through the examples provided, use of the mathematical model and the geometrical model is presented. The response is visualised as time histories and phase plane diagrams of different coordinates and as animations of the total system response. The different types of visualisations make an excellent combination when studying the system behaviour of different design solutions. In one example, simulation using the linearised set of equations gives the same results as simulation using the set of fully nonlinear equations, due to periodic response and the simple alternation of contact conditions. It is shown that the situation when any of the parameters vary suddenly is possible to simulate using the fully nonlinear equations of motion.

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