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The purpose of this paper is to identify and reduce the suspension rattle noise. First, the characteristics of the rattle noise are analyzed experimentally in the time and frequency domain. It was found that the rattle noise and vibration at shock absorber mounting point are strongly correlated. Second, the sensitivity analysis of design parameters is performed using a half car model in ADAMS. The result of the simulation model is verified by comparison with test. Finally, the influence of design parameters for the rattle noise is investigated. The study shows that the shock absorber mounting bushing is the most sensitive parameter to affect the suspension rattle noise. This paper shows how the suspension rattle noise can be improved.

The chracteristics of a steering system, such as steering stiffness, power steering assisting force, gear ratio and friction, have been known as an influencing factor on the vehicle handling. Especially, the driver's feeling during straight running, so called on-maneuver feel, is of interest to investigate the steering effects on the handling qualities. This paper introduces a steering system modelling using the multi-body simulation program AUTOSIM.