컴플라이언스 특성을 고려한 멀티링크 현가장치의 조향축 해석

Steering axis of suspensions is an important factor that affects ride and handling quality in the vehiclechassis development. Macpherson strut and double wishbone’s steering axis are defined geometrically, but multi-linksuspensions can not be geometrically analyzed. In this case instant axis theory is commonly used to find a steering axis. Since the steering axis is moving with varying caster and kingpin inclination angle, this method approximatelycorresponds with exact solution. In this paper, we propose a velocity analysis method to find a pure rotational axis ofthe wheel relative to suspension arms, that is exact solution of the steering axis. This paper extends the method toanalyze the steering axis of multi-link suspensions with bushing compliance. The analysis results applied to doublewishbone and multi-link suspensions demonstrate validity and accuracy of the proposed method.