Study of dynamic behaviour of aluminum automotive parts

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Study of dynamic behaviour of aluminum automotive parts

Richard, M.J. / Khadir, L. / Bouazara, M.

Stringent tolerances on mechanical components have created increasingly severe demands on the quality of new mechanical designs. The mathematical models used to simulate the various types of mechanical systems these days need to incorporate an optimization algorithm capable of minimizing the levels of vibrations coming from varied sources. Hence, the designer must find a way to attenuate theses vibrations and, in this study, we focus on the effect of resonance on car suspension parts. It is within this framework that the vibration behaviour of complex aluminum parts is investigated. The method is based on a simplistic Rayleigh-Ritz approach (to determine the first eigenfrequencies) which is incorporated into an efficient optimization process based on the ESO (Evolutionary Structural Optimization) method. We also exploit the digital simulation software ABAQUS to verify our calculations and validate the results obtained from our model. The analytical resolution and the numerical calculations of the mechanical part are, finally, validated by an experimental set-up which exploits a frequency analyser, acceleration sensors and an excitation hammer. The effectiveness of this approach is also demonstrated in the analysis of an upper car suspension arm. In this example, allowable values for design parameters are incorporated in order to minimize the performance variables which are beneficial for comfort without unduly compromising road holding capabilities.