더블위시본 타입 현가계의 하드포인트 최적화 관한 연구

This paper presents a method to optimize the suspension geometry, that is, hard points in front double whishbone type suspension of a jeep using the multi body dynamic simulauon software and Taguchi method. The hard points have an effect on toe angle largely. The vehicle models include front and rear suspensions and are modeled with the interconnection of rigid bodies by kinematic joints and force elements using DADS. The design variables to have an effect on the kinematic characteristics are obtained through the parametric study and sensitive analysis with bump steer simulation of front suspension. An objective function is defined as the area of absolute differences between the desired and experimental toe angle. The design variables that make the toe angle optimized are selected using thc Taguchi method. Thc objective function for handling performance is RMS(Root Mcan Squares) of the roll angle, roll rate, yaw rate, and laternl acceleration at center of the gravity of a body while lane change. To evaluate hard points of the optimized the front suspension, lane change simulations are performed.