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CSME 2020/12
Volume 41 No.6
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807-816
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Fatigue Life Prediction of Mount Systems for Vehicle Engines in the Frequency Domain
Jun Lia, Qi-Tao Zhanga, Xiao-Jun Yanga, Xi-Quan Qia and Xin-Tian Liub
aTechnology Center, Shanghai Huizhong Automobile Manufacturing Co., Ltd, Shanghai, 200122.
bSchool of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China
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Abstract:
A prediction method to improve the accuracy of fatigue life prediction for engine mounts is proposed, which is based on wavelength packet analysis and stress power density. The stress power spectral density of the fatigue failure site is simulated and experimentally verified through transfer function theory. The Dirlik method and bandwidth coefficient are used to determine fatigue life. The main frequency bands that affect life expectancy are analyzed through wavelet packet theory. And a bench test is performed to verify the results of different fatigue life prediction methods. Results revealed that wavelength packet analysis yields low relative errors between the predicted and experimental life expectancy. The prediction method based on wavelength packet analysis has high accuracy and will improve the results of the fatigue life prediction for key automobile components.
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Keywords: engine mount, stress power spectral density, Dirlik method, fatigue life prediction.
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*Corresponding author; e-mail:
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©
2020
CSME , ISSN 0257-9731
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