Exhaust simplification and application of vehicle modeling for road unevenness inputs

In order to investigate the exhaust vibration property excited by the road inputs, the exhaust system was simplified as four lumped mass system, and the 8-DOF vehicle model was established, three typical road surfaces including a couple of operating conditions were used to validate the efficiency of the vehicle model. The results show that the model can effectively represent the real vehicle vibration characteristic, furthermore, the model provides the base to evaluate the NVH contribution from the exhaust system vibration.