To increase the speed of vehicle development and to reduce development cost, computer aided analysis called CAE is applying more and more in the various field like crash safety, aerodynamics, noise and vibration, ride and handling and so on. CAE application for body durability performance is also demanded on the development phase on which experimental vehicle is not available. Body durability analysis consists on two types of simulation. One is the estimation of input to body, which is transferred the input from rough road surface through tire and suspension, using multi body simulation method. The other is the estimation of endurance of sheet material and connections like spot welds on the body itself, on which finite element analysis method is applied. And the results of these simulations are generally compared with predecessor car. In the situation of vehicle development described above, one of the effective approaches of the multi body simulation that predicts road-load input is using the methodology of the back calculation, which generates the input on tire contact point to ground from measurement data of predecessor vehicle response like sprung acceleration, spindle force and so on. Here, the transfer function between these measuring points and tire contact point are used for this back calculation method. This paper reports the result of study to improve the accuracy of body input prediction with this back calculation methodology. The study is focused on the quality of generated input on tire contact point, which is called supposed road profile. With the assumption that the error of simulation model (for example, mass of car body is different to real vehicle, which commonly happens) will be influenced to the quality of supposed road profile and the prediction accuracy of new car variant, 8 kinds of simple suspension model with artificial modelling errors are created. Using these models that are modelled only one wheel, various selections of response of predecessor car for generating supposed road profile called 'target channel' (sprung acceleration, spindle force, unsprung acceleration, and suspension travel) are studied. The result of this study with simple suspension model indicates following inclinations. 1. Iteration process for generating supposed road profile seems to eliminate the bad effect of selected response by modelling errors. Consequently, generated supposed road profile is dissimilar with correct road profile. 2. Sprung acceleration and spindle force show similar changes of RMS values for many sorts of modelling errors. On the other side, RMS values of unsprung acceleration and suspension travel change to deferent direction. The result also shows that the supposed road profile generated by sprung acceleration or spindle force leads better relative prediction accuracy for modification of suspension property. To verify this result with simple suspension model, different selections of responses for target channels are studied by using full vehicle simulation model. The result is that the combination of sprung acceleration and spindle force leads good prediction accuracy for the suspension design modification such as damper force characteristics and bump stop clearance.


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    Titel :

    The Improvement of Accuracy of Road Load Input Prediction for Durability


    Beteiligte:


    Erscheinungsdatum :

    2006


    Format / Umfang :

    10 Seiten, 8 Bilder, 1 Tabelle, 2 Quellen




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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