Abstract
Accurate reliability estimation for reciprocating seals is of great significance due to their wide use in numerous engineering applications. This work proposes a reliability estimation method for reciprocating seals based on multivariate dependence analysis of different performance indicators. Degradation behavior corresponding to each performance indicator is first described by the Wiener process. Dependence among different performance indicators is then captured using D-vine copula, and a weight-based copula selection method is utilized to determine the optimal bivariate copula for each dependence relationship. A two-stage Bayesian method is used to estimate the parameters in the proposed model. Finally, a reciprocating seal degradation test is conducted, and the proposed reliability estimation approach is validated by test data. Results show that the proposed model is accurate and effective in estimating the reliability of reciprocating seals.
Highlights
Hydraulic reciprocating seals can prevent leakage, contain pressure, and exclude contamination during reciprocating motion
As the dependence between either two performance indicators could be different, the D-Vine copula is used to describe the dependence among the three performance indicators and build the degradation model
A reliability estimation model for reciprocating seals based on multivariate dependence analysis was presented in this paper
Summary
Hydraulic reciprocating seals can prevent leakage, contain pressure, and exclude contamination during reciprocating motion. Friction force, and contact temperature are three important performance indicators for reciprocating seals which can reflect their operation and degradation status. The dependence structure of the marginal distributions corresponding to each two performance indicators may not be the same In this case, a degradation model for reciprocating seals based on multivariate copula function may not be accurate. Change to the material properties of the seal will lead to the change of topography in the contact area, and affect the leakage rate and friction force when the reciprocating seal is in operation [31] Contact temperature is another important performance indicator [31], [36], [37]. As the dependence between either two performance indicators could be different, the D-Vine copula is used to describe the dependence among the three performance indicators and build the degradation model
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