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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.

The study presented in this paper proposes an integrated and automated chassis design process, in which the associated design and analysis, including kinematic design and controller calibration, are sequentially performed through three steps. The first step is an automated kinematic design process that optimizes the hardpoints' coordinates and bush properties. First, ADAMS/Car is employed to evaluate the K&C characteristics by varying arrangements of the hardpoints and bush properties. In addition, a bush stiffness curve is approximated and represented by four parameters, allowing a designer to incorporate the curve as the design variables in the optimization process. Second, an optimization process is employed to automate the calibration of the UCC system modeled by Simulink, which is essential in improving the vehicle's dynamic behavior.