Electromechanical system Y-type sealing structure reliability assessment method based on proxy model

Abstract

The invention provides an electromechanical system Y-type sealing structure reliability assessment method based on a proxy model and relates to the field of electromechanical systems. According to themethod, a finite element method is adopted to calculate contact stress between a Y-type sealing structure and a hydraulic cylinder wall, the relation between the contact stress and medium pressure isfound, and the magnitudes of frictional force under different working conditions are calculated; and a Kriging proxy model based on an EFF learning mechanism is adopted to fit a limit state equationof a sealing ring structure in MATLAB software, the Kriging proxy model is called through a Monte Carlo method, and the probability of failure of the sealing structure is obtained. Through the method,it is not needed to establish a specific mathematical model, a precise structure response model can be provided, an optimal sample point can be effectively selected according to an EFF learning function sequence by the adoption of the Kriging proxy model based on the EFF learning mechanism, the limit state equation of the sealing structure can be simulated at high precision, reliability calculation time of the complicated structure is shortened, operation efficiency is improved, and the method is suitable for reliability analysis and assessment of practical engineering.

Description

technical field [0001] The invention relates to the field of electromechanical systems, in particular to a performance evaluation method of a sealing structure. Background technique [0002] With the rapid development of the aerospace industry, the requirements for the reliability of the aircraft are getting higher and higher. The sealing structure is a key component of the aircraft, and its failure may cause the aircraft to malfunction, affect the completion of the mission, or cause the aircraft to crash. , causing huge economic losses. The reason for the accident of my country's Dongfanghong-3 satellite was caused by the failure of the seal. Due to the leakage of the pipeline, it could not work normally after lift-off. On June 10, 1996, when Flight 8105 from Xiamen to Beijing was flying at an altitude of 8,000 meters, the cockpit was lost due to a mechanical failure, causing passengers to suffer from acute high-altitude hypoxia and high-altitude decompression. Therefore,...

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Problems solved by technology

But it should be pointed out that the Monte Carlo method needs a large number of samples to make the estimated value converge. It takes a long time to directly use the Monte Carlo method to call the finite element model to estimate the reliability of the sealing structure, which limits the use of the Monte Carlo method in electromechanical systems. Direct application in the reliability evaluation of complex structures such as system sealing structures

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