Abstract
This paper addresses a new reliability model, based on energy dissipation, considering performance degradation behaviors. Different from the two-state reliability model and traditional reliability model based on failure rate statistics, this paper focuses on the component energy loss due to its fault evolution, such as fatigue, aging and wear, and presents a reliability model based on the component’s energy dissipation, as well as establishing a power dissipation constrained reliability model for degradation-based reliability assessment. As a demonstration, the proposed method is applied to model and evaluate the failure behavior of the electro-hydrostatic actuation system. The results indicate that the proposed method is effective in describing its life-cycle degradation in the energy field, and provides a reliability assessment based on energy dissipation.
Highlights
Physical degradation inevitably occurs in engineering systems, which leads to potential risks and hazards
Many studies describe the multiple states of the system degradation process and estimate the system reliability based on multi-state models, including the universal generating function technique [1,2], the structure function approach [3], the stochastic process approach [4,5], and the Monte-Carlo simulation technique [6]
Based on the above failure behavior description, we can conclude that for different degrading processes, the energy dissipation can always be obtained by the time-varying degrading rates, which are related to work stresses with totally different forms
Summary
Physical degradation inevitably occurs in engineering systems, which leads to potential risks and hazards. A unified indicator of performance degradation, named failure related energy dissipation, is proposed, which can be obtained from PPoF models. The PPoF models of hydraulic pump, motor and hydraulic cylinder are established to obtain the failure related energy dissipation and the reliability assessment results are discussed. Measure the failure behavior of energy transfer system components and characterizes reliability degrading behavior such as wear, fatigue and aging inevitably occurs, which results inthe thermal and based on energy volumetric energydissipation. Based on the above failure behavior description, we can conclude that for different degrading processes, the energy dissipation can always be obtained by the time-varying degrading rates, which are related to work stresses with totally different forms. Failure related energy dissipation is the total energy loss caused by the degradation of an ETU. I where ψi (t) stands for the FED caused by ith degradation mechanism, s(t) is the time-varying works stresses, ri is the degrading rate of a certain type of degradation mode and fi (·) is the normalized function, which modulates the weight of different energy types
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