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The “structure-borne” noise of the shock absorber is often responsible for undesirable noise in the car interior cabin. These vibrations are attributed to friction, opening/closing of the valves, fluid cavitation or other complex phenomena. Early numerical prediction of the level of these vibrations in the car development process saves time and money. Most of the shock absorber models existing in the literature are limited to analysis of vehicle ride and handling. For noise and vibration analysis, the published works do not explicitly describe any model with its associated assumptions and a clear correlation with the experiments for high frequencies. Moreover there is no interpretation of the physical meaning of the high-frequency content of the response. The objective of the present work is to build a double tube shock absorber model correlated up to 700 Hz.

In this paper we study the nonlinear steady-state dynamic of a reduced finite element model of a brake system subjected to flutter instability. Both the pad and the disc are retained in the model and contact is enforced by a penalty method. A numeric Constrained Harmonic Balance Method (CHBM) is employed to compute the limit cycle responses. Results and computational performances are compared with those from implicit time integration. To demonstrate the effectiveness of the proposed method, the influence of modal damping for the brake system is carried out.