Abstract
The FEM model of an automotive exhaust system including powertrain is established by HyperMesh in this paper. Exhaust system's free modal is tested, and the correctness of the FEM model is testified by comparing them with the theoretical calculated results. The static and vibration analysis of the exhaust system is carried out by Ansys. The static analysis results indicate that the maximum displacement of the rubber hanger of the exhaust system satisfies the design requirements, but the force applied at all the rubber hanger is not even. The constrained modal analysis results indicate the engine's excitation frequency at idle speed and economic speed keeps off the natural frequency of the exhaust system. The harmonic response analysis results indicate the force transferred to body satisfies the design requirements. These will provide the theoretical evidence for automotive exhaust system structure improvement and optimum design.
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