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Shangguan W.,Changchun University | Shangguan W.,South China University of Technology | Chen D.,South China University of Technology | Ye B.,Ningbo Tuopu Vibro Acoustics Co. | Huang X.,Ningbo Tuopu Vibro Acoustics Co.
Qiche Gongcheng/Automotive Engineering | Year: 2012

Taking natural properties optimization and displacement control of powertrain mounting systems in a vehicle model series as design requirements and its static stiffness and mounting position as optimization variables, a scheme of natural properties optimization for the powertrain mounting systems in a vehicle model series based on a common set of mounting structure is proposed. The design idea of displacement control for the powertrain mounting systems in a vehicle model series is discussed. With the powertrain mounting system having maximum mass in a vehicle model series as baseline, the force-displacement characteristic curve of each mount is designed and then the mount displacements of other powertrains are checked. Finally a calculation example is given and the results show that after optimization all mounts with common set of structure in each powertrain in a vehicle model series can have a good distribution of natural frequency and meet the displacement control requirements of each powertrain in different driving conditions.

Shangguan W.-B.,South China University of Technology | Shangguan W.-B.,Ningbo Tuopu Vibro Acoustics Co. | Huang Z.,South China University of Technology | He L.-Y.,South China University of Technology | Duan X.-C.,Ningbo Tuopu Vibro Acoustics Co.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2010

In order to minimize the dynamic load transmitted from exhaust system hangers to a car body and enhance hangers against fatigue, a vibration analysis model for an exhaust system and a powertrain was established. The natural frequencies and modal-shapes were calculated and compared with those of the experiments under conditions of free-free boundary and constraint boundary, the results validated the proposed model. Through minimizing the dynamic load in vertical direction transmitted from hangers to a car body, and restricting the static displacement of isolators within a certain range, a model for optimizing dynamic stiffness of exhaustive system hangers was established. The vibration responses of the body floor at driver position were measured when the car was running at idle speed and the second gear level. It was seen that the vibration response is reduced greatly at idle speed and in the engine speed of 1000 rpm to 3900 rpm using the optimized hangers. The results showed the effectiveness of the proposed model and optimization method. The modeling and methods for optimizing hangers of exhaust system presented here are helpful to estimating dynamic stiffness of exhaust system hangers in design stage.

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