Hanger Location Layout of Automotive Exhaust System

The hanger location layout is crucial, because it is related to the rubber hanger life, the natural frequency of the exhaust system and the force transferred to the body from the exhaust system. In order to solve the hanger layout problem of a new developed automotive exhaust system, the finite element method (FEM) of the automotive exhaust system including the powertrain was established. The correctness of the FEM model was verified by means of experimental modal analysis. Using average driving DOF displacement (ADDOFD) method, the hanger Location was arranged. The static and vibration analysis of the exhaust system was carried out to verify the hanger location layout. The weight analysis results indicate that the maximum displacement of the rubber hanger satisfies the design requirements. The static analysis results under 4g acceleration indicate the maximum stress meets the strength requirements of the material. The constrained modal analysis results indicate the natural frequency of the exhaust system keeps off the engine's excitation frequency at idle speed and economic speed. The harmonic response analysis results indicate the force transferred to body satisfies the design requirements. The simulation results show that using ADDOFD method to determine the hanger position of the exhaust system is feasible.