Publications Search Results

Now showing 1 - 10 of 12
  • Publication
    Ein neues Konzept zur Erprobung und Absicherung von Gesamtfahrzeugfunktionen
    ( 2016)
    Kleer, M.
    ;
    Bitsch, G.
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    Pena Vina, E.
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    Rothmann, T.
    ;
    Dreßler, K.
  • Publication
    Online condition monitoring based on real-time system simulation
    ( 2010)
    Engelhardt, L.
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    Bitsch, G.
    ;
    Schindler, C.
  • Publication
    Real-time simulation of multibody-systems for on-board applications
    (Fraunhofer ITWM, 2010)
    Engelhardt, L.
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    Burger, M.
    ;
    Bitsch, G.
  • Publication
    Systemsimulation und Erprobung in der Trailerentwicklung
    ( 2009)
    Wildhagen, M.
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    Bitsch, G.
    ;
    Dreßler, K.
    Over the last years the introduction of virtual development and simulation methods has had an enormous impact on the development process for vehicles. Especially the high number of vehicle variants in commercial vehicle industry - together with concurrent importance concerning reliability - pushed the introduction of refined test and simulations environments a lot. However, performing physical tests still is a key element in the durability refinement and validation process. Beginning with building up customer related design loads, an efficient process is characterized by a good combination of test and simulation. In this paper targets, tools and useful interactions in this process are explained. Some typical application examples in the process of developing trailers at Schmitz Cargobull are shown.
  • Publication
    Virtual durability test rigs for automotive engineering
    ( 2009)
    Dressler, K.
    ;
    Speckert, M.
    ;
    Bitsch, G.
    In recent years so-called 'virtual test rigs' have become more and more important in the development process of cars and trucks. Originally, the idea was to substitute expensive durability tests with computer simulation. Meanwhile, the focus has changed towards a more cooperative usage of numerical and laboratory rig simulation. For many safety critical issues laboratory tests remain indispensable. In early development stages, when no physical prototypes are available yet, numerical simulation is used to analyse and optimise the design. In this paper, we show how to build numerical simulation models of complex servo-hydraulic test systems and their test specimen using multi-body simulation for the mechanics in combination with simulation models for the hydraulics and controls. We illustrate this at two industrial application examples: a spindle-coupled passenger car suspension rig and a tyre-coupled full vehicle rig. We show how the simulation models are used to design and optimise better test rigs and to support the test rig operation by preparing the physical tests with new specimen, i.e. by performing numerical simulations including numerical drive file iteration before the physical tests start.
  • Publication
    Computing digital road profiles for agricultural vehicle simulations
    ( 2007)
    Bitsch, G.
    ;
    Dreßler, K.
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    Marquardt, A.
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    Nikelay, I.
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    Gölzer, M.
    The development of vehicles is increasingly based on computer simulations. CAE simulations can be used to validate and optimize vibration behaviour, acoustics, handling and durability properties even in early design stages when prototypes are not yet available. To do that, two essential types of input data are needed: Model data: construction parameters like the geometry, masses, mass inertias, characteristic curves for springs, dampers and tyre models; Dynamical load data: system loads caused by the road profile. To perform simulations for new vehicles in absence of prototype measurements a realistic system input is essential. A possibility to obtain an invariant system input is to identify a synthetic road profile by appropriate mathematical algorithms like iterative learning schemes. In this work methods originally developed for passenger car engineering are adopted to agricultural machinery. For a John Deere forage harvester (reference vehicle) wheel forces and accelerations have been measured on a test track. Using multi body simulation a 'digital road excitation' is identified which is then applied as load input for the new harvester version. The results are verified by measurements. For forage harvesters the tyre dynamics is of special importance. Thus it has been analysed which kind of tyre model and which accuracy for the tyre parameters is sufficient for this type of analysis. Entnommen aus TEMA
  • Publication
    Einsatz von Simulationswerkzeugen zur Auslegung und Optimierung von Prüfkonzepten
    ( 2007)
    Weigel, N.
    ;
    Weihe, S.
    ;
    Bitsch, G.
    ;
    Dreßler, K.
    Simulation of test rigs and especially of vehicle parts or complete vehicles on test rigs by combining multi-body simulation with models for control and hydraulics permits a major reduction of product development time expense. This paper presents such a co-simulation model for a full vehicle test rig. The validation of the vehicle model by means of test track measurements as well as identification and validation of the test rig model (including hydraulics and control) is discussed.
  • Publication
    Comparison of the solutions of the elastic and elastoplastic boundary value problems
    (Fraunhofer ITWM, 2006)
    Lang, H.
    ;
    Bitsch, G.
    ;
    Dreßler, K.
    ;
    Speckert, M.
  • Publication
    Einsatz von Simulationswerkzeugen zur Auslegung und Optimierung von Prüfkonzepten
    ( 2006)
    Weigel, N.
    ;
    Weihe, S.
    ;
    Bitsch, G.
    ;
    Dreßler, K.
  • Publication
    A homotopy between the solutions of the elastic and elastoplastic boundary value problem
    ( 2006)
    Lang, H.
    ;
    Dreßler, K.
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    Pinnau, R.
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    Bitsch, G.