| 201B5 |
|---|
| Chaotic Vibration in a Non-linear Vehicle Model |
| AUTHORS |
| Qin Zhu, Mitsuaki Ishitobi, Hiroyuki Tomioka (Kumamoto University) |
| ABSTRACT |
| An automobile is a non-linear system composed by components that have non-linear properties, such as tires, suspensions and so on. Since the disturbance from the road may induce uncomfortable shake and noise in the vehicle body, it is important to study the dynamic response of the vehicle. In the present study, the chaotic vibration in a four degrees-of-freedom vehicle model is considered. The study begins by introducing a simplified non-linear mechanical model. The vehicle body is supposed to have rigid heave and pitch motions and the two unsprung masses are assumed to have only heave motions. The front and rear suspension and tire are modeled as non-linear spring and damper, respectively. The forcing function is assumed to be sinusoid that is used to simulate a bumpy road surface. The dynamic responses of the model are investigated numerically. Resonance curves, bifurcation diagrams and Poincare maps are used to trace the chaotic vibration. The dominant Lyapunov exponent is used to identify the existence of chaos in the system. Our studies show that the chaotic vibration may exist in the ground vehicle. |
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Annual Conference 2002