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Effect of Suspension and Body Flexibility on Dynamic Behavior of Passenger Cars

[+] Author Affiliations
M. Durali

Sharif University of Technology

A. Kasaiezadeh, O. B. Nakhjavani

Saipa Company

Paper No. IMECE2005-81389, pp. 529-534; 6 pages
doi:10.1115/IMECE2005-81389
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Dynamic Systems and Control, Parts A and B
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Dynamic Systems and Control Division
  • ISBN: 0-7918-4216-9 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

The usual practice in vehicle dynamic modeling is to consider the body and suspension components as rigid elements. The question this paper is trying to answer is; how large the errors will be if flexibility of the components are not considered in vehicle dynamic model. The flexible vehicle model made for this study has 300000 elements which are generated using Super-element analysis in MSC/NASTRAN and made usable in MSC/ADAMS environment using Craig-Bampton theorem. The full vehicle model made in ADAMS has 200 degrees of freedom and includes all bushings, mechanism, power train, and suspension system. The model was used in simulating ride and handling behavior of the vehicle in several virtual road conditions. The results show that although a rigid car model will result errors in handling behavior, but these errors are all towards increased safety margin when used in design process. On the contrary using a rigid model in vibration and ride analyses of the car tend to suppress the vibrations, and a flexible model markedly affect the vibration modes of the body and the suspension system components

Copyright © 2005 by ASME

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