EFFECT OF BOUNCING AND PITCHING ON THE COUPLED NATURAL FREQUENCY OF AN AUTOMOBILE

Abstract

ABSTRACTThis paper describes a unique solution of bouncing and pitching interactions, in whichit play an increasingly significant role in vehicle. While the behavior of vibratingsystem has motivated numerous experimental and numerical works, very few studieshave been devoted to the case of vibration of car. This paper presents an investigationof bouncing – pitching effects, which is of strong interest for vibration of vehicle. Theprediction of the natural frequencies in the car is thus a challenging task. This paperhave a novel discussion of the dynamic behavior (natural frequencies and modeshapes) of vehicle and the relationships between the coupled natural frequency of thecar. This work is theoretical and finite element method via ANSYS software study ofdynamic performance of vehicle which is consists of two masses (body of car andtire) . The paper deals with obtaining the vibration characteristic of an automobileanalyzed as system without damping due to the effect of bouncing and pitching. Thefocus of the vibration analysis is to obtain the eigenvectors, and the correspondingnatural frequencies of the system. Good agreement is evident between the theoreticaland finite element method in which the discrepancy between the two methods is about0.05% for bouncing and 0.2% for pitching model. Also, it can be deduced that the joinbetween car and tire, the result of the natural frequencies are differed from that of thenatural frequency for the individual one, in which the higher frequency is increasedand decreased the less one.