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| A study on optimization methods of dynamic stiffness for automotive exhaust system hangers |
| SHANGGUAN Wen-Bin1,2;HUANG Zhi1;HE Liang-yong1;DUAN Xiao-cheng2 |
| 1 School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510641, China2 Ningbo Tuopu Vibro-Acoustics Co., Ltd, Ningbo, 315806, China |
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Abstract For minimizing the dynamic load transmitted from exhaust system hangers to a car body and enhancing the fatigue of hangers, a vibration analysis model for an exhaust system and a powertrain is established. The natural frequencies and mode shapes are calculated and compared well with the experiments for free-free boundary and constraint boundary, which validate the calculation model. By minimizing the dynamic load transmitted from hangers to a car body, and restricting the static displacement of isolators within a range, a method for optimization of dynamic stiffness for exhaustive system hangers is established. The vibration responses of the body floor at driver position are measured when the car is running in idle and second gear (wide opened throttle). It is seen that the vibration response is reduced greatly at idle and in the engine speed of 1000rpm to 3900rpm using the optimized hangers, which validates the proposed model and optimization method. The modeling and methods for optimization hangers of exhaust system presented in this paper are effective for estimating the dynamic stiffness of exhaust system hangers in the design stage.
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Received: 12 November 2008
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2010, Vol. 29 
