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Wu J.,South China University of Technology | Wu J.,Guangdong Provincial Key Laboratory for Automotive Engineering | Dong Z.-X.,South China University of Technology
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2013

The mount stiffness of a powertrain mounting system (PMS) generally fluctuates around its nominal design value due to measurement inaccuracy, processing and installation errors, and material aging. To improve the robustness of the frequency allocation and decoupling layout of a PMS, an interval optimization model was presented. In this model, interval number was used to describe the uncertainty of the mount stiffness, interval reliability and interval probability indices were used to characterize the robustness of the decoupling layout and frequency allocation, respectively. Then, a six-sigma random robust optimization model for a PMS was constructed in this model, the fluctuation of the mount stiffness was assumed to obey a uniform distribution. The interval optimization and six-sigma random optimization approaches were used to maximize the decoupling ratios of a general car PMS under robustness requirements of frequency allocation and decoupling layout. Optimization results showed that both the interval optimization and the six-sigma random optimization can obtain satisfactory robust designs, and the optimization results of the two optimization models have a good consistency.


Wu J.,South China University of Technology | Wu J.,Guangdong Provincial Key Laboratory for Automotive Engineering | Li S.,South China University of Technology
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2016

The frequency and decoupling ratio of a loader's powertrain mounting system were optimized in order to improve its vibration isolation performance. The mounting stiffness and installing position were selected as optimized variables. The results showed that its optimal natural frequencies are more rational, and the optimal decoupling ratios in Z and θx directions are improved significantly; the reliability of the optimal scheme is higher than the original one. At last, test results showed that the vibration isolation performance of the powertrain mounting system is significantly improved. © 2016, Chinese Vibration Engineering Society. All right reserved.

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