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O-shaped rubber seal ring service life prediction method based on multivariate sample differences

A rubber sealing ring, multi-sample technology, applied in the direction of instrumentation, design optimization/simulation, calculation, etc., can solve the problems of large deviation between the predicted results and the actual, and the randomness and dynamics of the product degradation process without considering the individual differences of samples. , to achieve the effect of simple calculation

Inactive Publication Date: 2017-12-05
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for predicting the life of an O-ring rubber sealing ring based on multivariate sample differences, so as to solve the problem that existing methods do not take into account the differences between individual samples and the randomness and dynamics of the product degradation process. , leading to the problem of large deviations between the predicted results and the actual

Method used

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  • O-shaped rubber seal ring service life prediction method based on multivariate sample differences
  • O-shaped rubber seal ring service life prediction method based on multivariate sample differences
  • O-shaped rubber seal ring service life prediction method based on multivariate sample differences

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Experimental program
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Effect test

Embodiment

[0104] Design of constant stress accelerated degradation test scheme for O-ring rubber sealing ring:

[0105] Taking the nitrile rubber O-ring as the research object, a constant stress accelerated degradation test is carried out, and the collected degradation data is recorded as X ik (t j / S p ), where i=1,2,…,m p , j=1,2,...n p , p=1,2,...,P; k=2 means that there are two performance parameters, namely compression set ε and compression stress relaxation rate σ / σ 0 , P=4 means that there are four accelerated stress levels, T 1 =65℃, T 12 =80℃, T 3 =95℃, T 4 =110℃,m p =8 means that 8 samples were put into the four temperature stress levels respectively, n 1 =14,n 2 =12,n 3 =11,n 4 = 10 means the number of measurements under the four stresses, and the test censored test is respectively t 1 =25d,t 2 =18d,t 3 =15d,t 4 = 12d, and the number of tests under each temperature stress is different;

[0106] Step 1. Establish the multivariate nonlinear Wiener process degra...

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Abstract

The invention discloses an O-shaped rubber seal ring service life prediction method based on multivariate sample differences. The O-shaped rubber seal ring service life prediction method comprises the specific steps that a multivariate nonlinear Wiener process degradation model of an O-shaped rubber seal ring is established; parameter variable function models are established, including data statistics and analysis and the function relation of parameters and stresses; a reliability service life calculation model is established; unknown parameters are calculated; the storage life of the O-shaped rubber seal ring is predicted under normal temperature and stress. The differences of sample individuals of O-shaped rubber seal rings are considered, mean values and standard deviations of drift coefficients, diffusion coefficients and Copulas parameters in the Wiener process are processed into variables, and the variables and an acceleration stress form a function relation, so that final prediction results are more in line with the actual engineering situation and are more accurate.

Description

technical field [0001] The invention belongs to the technical field of reliability evaluation of accelerated degradation tests, in particular to a method for predicting the life of an O-shaped rubber sealing ring based on multivariate sample differences. Background technique [0002] For many high-reliability and long-life products, it is difficult to collect enough failure data under normal storage or working conditions, which affects the reliability evaluation of the product. Accelerated degradation test is an important part of accelerated test technology. It is a method widely used in the field of reliability analysis at present to shorten the failure time of the product, collect the degradation data of the product in a short period of time, and then establish a reliability model to extrapolate the reliability life under normal stress. [0003] In some practical engineering problems, many products have multiple performance degradation quantities, and there may be correlat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/06
Inventor 鲍兆伟顾晓辉
Owner NANJING UNIV OF SCI & TECH
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