Abstract
In the reliability analysis of a sealing structure, radial clearance of the contact surface is usually regarded as a failure criterion, and the sample size is usually quite small, which brings great challenges to uncertainty quantification. Therefore, this paper proposes a reliability analysis method based on the leakage mechanism of the sealing. With the application of dynamic interval, the proposed method can be used to deal with problem of degradation in small sample to evaluate reliability. Moreover, the dynamic reliability with the mixture of the probabilistic and non-probabilistic variables can be obtained using the proposed method. An illustrative numerical case study of a spool valve is conducted in order to validate the proposed method and the implemented reliability sensitivity analysis. The proposed method is of great help in evaluating and predicting reliability with small degradation sample and hybrid uncertainties.
Highlights
The problem of machines and devices assessment is considered as one of the most important and relevant reliability analysis issues [12, 13, 27, 29]
As a matter of fact, the failure of the sealing of a spool valve is caused by internal leakage [31], whose mechanism shall be taken into account in order to conduct the reliability analysis [11]
This paper proposed a failure-based reliability analysis method for sealing
Summary
The problem of machines and devices assessment is considered as one of the most important and relevant reliability analysis issues [12, 13, 27, 29]. The analysis of machines and devices reliability is focused on the identification and evaluation of various types of uncertainty, their effects and the assessment of the probability of a component failure [38]. As a matter of fact, the failure of the sealing of a spool valve is caused by internal leakage [31], whose mechanism shall be taken into account in order to conduct the reliability analysis [11]. This paper proposed a physics of a failure-based reliability analysis model, where the dynamic interval is applied to deal with the issue of degradation in a small sample. The proposed method takes a failure mechanism into consideration to build a dynamic reliability model, and the reliability is resolved with the hybrid uncertainty method. An illustrative case study of the sealing in a spool valve is conducted to validate the proposed method and to analyse the dynamic reliability of the sealing
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