Robustness optimization method for frequency and decoupling ratio of powertrain mounting systems
Wu Jie 1, 2; zhou sheng-nan1
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1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641;2. Guangdong Key Laboratory for Automotive Engineering, Guangzhou 510641
Due to measurement inaccuracy, installation errors and aging, the mount stiffness of a powertrain mounting system (PMS) is not deterministic, thus the frequencies and decoupling ratios of a PMS are also uncertain. Interval numbers are used to describe the uncertainties of the mount stiffness, frequencies and decoupling ratios of a PMS in consideration of easily obtaining the variation ranges of the mount stiffness, and the probability distribution of the stiffness need not to be known. An improved interval truncation method for obtaining the variation ranges of frequencies and decoupling ratios is presented and its computational accuracy is verified. To improve the design robustness of frequencies and decoupling ratios, an interval optimization method is presented. The presented optimization method is applied to a PMS for maximizing decoupling ratios with frequency constraints. Optimization results show that the interval optimization can significantly increase the robustness of frequencies in Roll and Pitch directions. In contrast to the deterministic optimization, though the decoupling ratios in Vertical and Pitch directions decrease slightly, the interval optimization result can meet the decoupling layout requirement.
Wu Jie;;zhou sheng-nan.
Robustness optimization method for frequency and decoupling ratio of powertrain mounting systems[J]. Journal of Vibration and Shock, 2012, 31(4): 1-7
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