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In an automotive suspension, a shock absorber plays a significant role to enhance the vehicle performances, particularly ride comfort and road holding. Because of its important influences on the overall vehicle performances, the understanding of its physical characteristics is essential. Thus, this paper develops a mathematical model of twin-tube shock absorber that is widely used in modern production cars. The model is derived based on a rational polynomial formulation. This formulation generally represents the flow behaviors of fluid across a restriction. Further, simulation results are compared to those obtained from experiments to determine the model accuracy. The result comparison illustrates that the model is able to describe the behavior of shock absorber with slight discrepancies.

The aim of this study was to build a model-based design tool that allows multidisciplinary teams to design vehicle performance targets using an easily understandable common index during the conceptual design phase of vehicle ride comfort performance. The newer a system is in the conceptual design stage without a prototype, the more difficult it is to describe its performance and impact on the vehicle. The originality of this study lies in the proposal of an understandable design tool for the social implementation of new technology, referred to as the multidisciplinary optimization (MDO) and “1DCAE” design concept. More specifically, the subject is the conceptual design of a unique electronically controlled damper system. A model-based development tool was developed, and numerical analysis was performed based on the following approach.