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A gear contact fatigue reliability analysis method

A contact fatigue and analysis method technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as nonlinearity, large dispersion of uncertain parameters, etc., and achieve the effect of ensuring reliability

Active Publication Date: 2019-01-08
HUNAN UNIV
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AI Technical Summary

Problems solved by technology

In fact, the dispersion of uncertain parameters in gear contact fatigue problems is usually large, and the relationship between fatigue life and parameters becomes extremely nonlinear as the number of fatigue cycles increases

Method used

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  • A gear contact fatigue reliability analysis method
  • A gear contact fatigue reliability analysis method
  • A gear contact fatigue reliability analysis method

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Embodiment Construction

[0010] Due to the cyclic action of the contact force on the tooth surface, the gear structure will be damaged by contact fatigue. Due to the influence of manufacturing errors and environmental factors, the gear structure has parameter uncertainties in terms of geometric characteristics, material properties and loads. The invention patent can consider the influence of these uncertain parameters, and carry out efficient fatigue reliability analysis on the gear structure.

[0011] In actual engineering, there are many factors that affect the contact stress of the tooth surface. For different working conditions, system effects, gear precision, etc., the contact stress of the tooth surface often varies greatly. For the sake of convenience, the present invention is described by taking an involute spur gear as an example. According to the American ANSI / AGMA2001-D04 standard, the tooth surface contact stress σ H It can be calculated as follows:

[0012]

[0013] In the formula: ...

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Abstract

The invention discloses a gear contact fatigue reliability analysis method. Firstly, the contact stress model of gear is established, the residual fatigue strength after a certain cycle is obtained onthe basis of a fatigue S-N curve, and then the function of gear contact fatigue failure is constructed. Then, according to the distribution characteristics of the random parameters, the Monte Carlo method is used to generate point set, the initial Kriging model is constructed by randomly selecting N points as the experimental design points, and then the sample points which are closest to the limit state surface or have the largest error are obtained by active learning strategy, and the sample points are added to the original experimental design points as the best sample points, and the Kriging model is updated until convergence. According to the convergent Kriging model, the approximate value of the function corresponding to all the sample points is obtained, and the failure probability is calculated by Monte Carlo method. Finally, an example is given to verify the feasibility of the proposed method. The gear contact fatigue reliability analysis method of the invention is more efficient and practical.

Description

technical field [0001] The invention relates to a reliability analysis method, in particular to a gear contact fatigue reliability analysis method based on an active learning strategy. Background technique [0002] Gears are often used as the main carrier of power transmission of equipment, and the damage caused by tooth surface contact fatigue is the most common fatigue failure mode, accounting for about 70% of scrapped gears. The tooth surface contact fatigue analysis for gears is very important for equipment. Safe operation is essential. [0003] Traditional gear contact strength design usually uses safety factor as a measure. Because the determination process of the safety factor involves human subjective factors, it often results in a bulky structure, and even has hidden dangers of insufficient safety, which has gradually failed to meet the needs of modern engineering design. Since the uncertainty factors in the service process of the structure can be accurately measu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F2119/12G06F2119/06G06F30/23
Inventor 龙湘云姜潮田亚鑫李博川刘志成
Owner HUNAN UNIV
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