Non-linear dynamics analysis of a steering gear system with backlashes

Abstract eng:
Steering Gear transmission plays an important role in various transmission systems. This paper investigates the dynamic behaviour of a steering system with several backlashes. First, the motion equations of a 3-DOF system about relative movements were established. Then the modal analysis was used to analyse the natural frequencies and amplitude-frequency curves of the system using the harmonic balance method. Second. the system was numerically simulated by Runge-Kutta method. Bifurcation, chaos and other complex dynamic phenomena were presented. Finally, influences of rotational speed ratio, gear backlashes, load force and damping coefficients on dynamics of the system were analysed. The result of the paper indicates that both the operating conditions and the structural parameters of the steering gear system can be designed properly to avoid undesirable dynamic motion and realize better mechanical properties.

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