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This paper presents the optimization of bushing stiffness curves and suspension tuning parameters for enhancing the handling performance as well as the kinematic and compliance characteristics of the automotive suspension system. The optimization process consists of two steps. In the first step, the trailing arm bushing curves are optimized to satisfy the Kinematic and Compliance (K&C) characteristics of rear suspension. In this case, bushing stiffness curves are described as three parameters (linear gradient, non-linear gradient, transition position between linear range and non-linear range). The four optimization cases are executed to compare the design alternatives and choose the best one. In the second step, the handling performances are added to design requirements. In order to execute an automatic analysis process, K&C analysis and handling simulation are sequentially integrated using by Process Integration and Design Optimization (PIDO) technology.

An optimization program for the design of wiper linkages is developed to minimize jerky motion while satisfying design constraints on kinematic and torque performances, mobility condition, and packaging. The lengths/orientations of links and the position of a driving motor are selected as design variables. In our optimum design program for wiper linkages, an optimization module interacts with an analysis module which calculates kinematic and force/torque properties, until convergence. The optimization results of a particular wiper linkage are presented to illustrate the effectiveness of the program developed.