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Li L.,South China University of Technology | Zeng X.-K.,Guangdong Polytechnic Normal College
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2014

A radial type hydraulic bushing was taken as a study object, it was widely used as a vibration isolator in vehicle chassis systems. A lumped parameter (LP) model for a hydro-bushing was applied to its dynamic characteristics analysis. Two-way fluid-structure interaction (FSI) FEA (nonlinear finite element analysis) technique was used to identify the main parameters of the LP model. The FEA method was also applied to calculate the dynamic characteristics of the hydraulic bushing. Comparing the calculated results with the experimental data and the numerical prediction results, the feasibility and correctness of the FEA method was verified. The proposed method provided an effective means for design optimuzation and development of hydraulic bushings. Source


Zeng X.-K.,Guangdong Polytechnic Normal College | Wang H.-Y.,Guangdong Polytechnic Normal College | Liu J.-R.,South China University of Technology
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2014

Test methods and parameters assessment for the dynamic performances of an automatic tensioner in an engine front end accessory drive (FEAD) system were investigated. The dynamic performances of the tensioner included dynamic stiffness and loss angle. The influences of pre-torque, excitation amplitude and excitation frequency on the dynamic characteristics of the tensioner were measured and analyzed. Considering the pre-torque, the spring stiffness and damping coefficient of the tensioner, and the moment of inertia for the tensioner arm, a hysteresis model used for the relation between the torque and angular displacement of the tensioner was built. Parameters of the model were identified with the least-square method. The dynamical properties of the tensioner were calculated and compared with the test data, the correctness of the presented hysteresis model was validated. Moreover, the equation of rotational vibration for the tensioner arm in a FEAD system was established. In the equation, the dynamic stiffness and equivalent damping of the tensioner were calculated based on the hysteresis model of the tensioner. Then, the rotational vibration responses of the FEAD system were calculated and compared with the test data, they agreed well each other. The results showed that the hysteresis model of the tensioner can provide a reference model for rotation vibration calculation of a FEAD system. Source

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