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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
Tel:
86-571-87041360,87239525
Fax:
86-571-87239571
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No.9 Gaoguannong,Daxue Road,Hangzhou,China
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meem_contribute@163.com
Abstract: It was very important to understand the strength and life distribution of gear for the design and reliability analysis of gear life. Therefore, based on the experimental data of bending fatigue and contact fatigue, the C-P-S-N curve of a metro gear was studied, and its reliability was analyzed.Firstly,aiming at the distortion of P-S-N curve, a modified method of fitting material parameters was proposed, and the contact and bending C-P-S-N curves with different confidence levels were respectively calculated. Then ,the fatigue life distribution parameters of a metro gearbox in Zhengzhou under different working conditions were obtained based on the C-P-S-N curve with 95% confidence level, and the life dispersion law was analyzed. Finally, sequential reliability theory was used to evaluate the comprehensive reliability of gear under multiple working conditions. The research results show that the fatigue strength difference between the method of fitting material parameters and other methods is 0.48%, which has the same reference as other methods. The dispersion of fatigue strength increases with the increase of confidence. The coefficient of variation of bending fatigue strength is about 0.096, and the coefficient of variation of contact fatigue strength is about 0.062. The reliability of contact fatigue life is less than the bending fatigue life, that is, the pails are more likely to have contact fatigue failure. When the metro mileage reaches 1.360×107 km, the probability of no contact fatigue failure is about 0.989.
Key words: P-S-N curve; fatigue strength; confidence; life distribution; sequential reliability theory; method of fitting material parameters; comprehensive reliability
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