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In order to reduce the impact of automotive exhaust systems on the vehicle vibration, finite element modal analyses of the exhaust system of a motor vehicle are conducted in its natural state, partially constraints state and fully constraints state. The natural frequencies and mode shapes of the exhaust system are obtained. The harmonic analysis is conducted on the basis of the modal analysis. The results show that: the vibration amplitude of the exhaust system at low- speed operating condition is relatively bigger than that of the exhaust system in high-speed conditions. The excitation frequency of the engine at the idle and economy speed can avoid the natural frequency of the exhaust system, so it can be stated that the system has good dynamic characteristics. Suspension points on the exhaust system are optimized and the optimal mounting points are located based on the method of the average drive DOF displacement (ADDOFD). The study has practical significance for reducing the vibration of automobile exhaust systems and the vehicle. using finite element software and AVL-EXCITE software. The vibration response of the exhaust system and the vibration transmissibility of the exhaust pipe were obtained. Its vibration coupling characteristics was examined. Shang guan Wen bin et al. (2) established vibration analysis model of the exhaust system including a power train. They conducted the free modal and constraint modal test of the exhaust system and their calculated values were analyzed. They proved the correctness of the exhaust system vibration model. Lu Wang Wei et al. (3) established a three-dimensional model of a diesel exhaust system using software Pro/E and obtained its finite element model using software Hyper Mesh. They conducted the simulation of exhaust system using the finite element software ANSYS and got the modal characteristics for the exhaust system. Harmonic analysis of the exhaust system is conducted on this basis. Liu Ming et al. (4) conducted modal analysis and harmonic response analysis of a vehicle exhaust system using the finite element method. They obtained the natural frequency of the exhaust system and found the Modal nodes by modal analysis. The influence of the suspension vertical stiffness regarding the natural frequency of the exhaust system was obtained. Liu Zhien et al. (5) conducted the static, modal and dynamic analysis of the exhaust system. The results showed that the hanging position designed with the method of Average driving DOF displacement (ADDOFD) is reasonable. The suspension system can meet the force requirements and avoid engine idling excitation frequency. The suspension system can meet the force requirements and can avoid engine idling excitation frequency. It ensured that the force from the hook passed to vehicle was within the design limits. Baoen Tao et al. (6) established the finite element model of automotive exhaust system and conducted modal analysis. He also analyzed several pre-order natural frequencies and obtained several mode shapes of the exhaust system. Based on the modal analysis and the vibration test results of exhaust system, they researched and analyzed the vibration of exhaust systems caused by excitation

An Analysis of the Vibration Characteristics of Automotive Exhaust Systems and Optimization of Suspension Points