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Optimization Method for Powertrain Mounting Systems Considering the Errors in Inertia Properties Testing
HOU Wei-chun;WU Jie
   2012, 32 (3): 121-124.   DOI: 10.3969/j.issn.1006-1355.2012.03.028
Abstract （1317）            Save
Generally, the inertia properties of a powertrain mounting system (PMS) are determined by measuring, and the measurement error is less than 3 %. The PMS frequency and decoupling ratio are closely related to the inertia properties, mount stiffness, and mount position, thus the actual PMS frequency and decoupling ratio will not be consistent with their designed values. In this paper, the inertia properties were described with uniformly distributed random variables, the mount stiffness parameters were selected as design variables, and a robust optimization method was presented in order to desensitize the PMS frequency and decoupling ratio to the inertia properties. The optimization results of a transversely mounted PMS show that the robustness of the frequency, decoupling ratio, and frequency separation can be effectively improved compared with that of the traditional deterministic optimization method.
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Interval Analysis for Intrinsic Frequency and Decoupling Ratio of Powertrain Mounting Systems
WU Jie;; LIU Yu-bo
   2012, 32 (3): 12-15.   DOI: 10.3969/j.issn.1006-1355.2012.03.003
Abstract （1961）            Save
The mounting stiffness of powertrain mounting system (PMS) of vehicles has some uncertainty in the process of manufacturing, installation and vehicle operation, therefore the PMS frequency and decoupling ratio are also uncertain. To investigate the variation characteristics of the frequencies and decoupling ratios, an interval analysis method was proposed. In the case that the range of the mounting stiffness variation is known while its stochastic characteristics are unknown, the interval number in interval mathematics can be employed to describe the uncertainty of the mount stiffness variation. The variation range of the intrinsic frequencies and the decoupling ratios of the PMS were calculated accurately with the application of the combination method. The interval reliability formula was given to describe the robustness of the frequencies and decoupling ratios. The interval reliabilities of frequencies and decoupling ratios in the vertical and pitch directions were calculated. Computational results show that the mount stiffness parameters need to be optimized in order to increase the interval reliabilities of the frequencies and the decoupling ratios in vertical and pitch directions.
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