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Reliability analysis and maintenance optimization for systems with degradation-mitigation and shock-resistance subsystems
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DOI：10.1016/j.ress.2025.112137.png)
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Abstract
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This study investigates reliability and maintenance optimization for systems comprising two distinct functional subsystems, one providing degradation-mitigation and the other shock-resistance functions (e.g., cooling, lubrication, or shock absorption), along with a backbone subsystem responsible for the primary task. System reliability is modeled as depending on complex interactions among subsystem degradations and random shocks. Existing research often focuses on a single function or simplifies subsystem roles to the system level, potentially yielding less accurate models. In the proposed framework, each functional subsystem gradually degrades, weakening its associated function, while the backbone subsystem is exposed to random shocks. System failure occurs if any subsystem fails, necessitating replacement. Reliability is analyzed through simulation, and age-based and opportunity maintenance strategies are optimized via implicit enumeration. The approach is demonstrated with numerical examples of a wind turbine and a substation system, and its effectiveness is validated against benchmark strategies. Results show that incorporating both functional subsystems extends system lifespan compared to models that exclude them. Lower maintenance costs of the backbone subsystem further enhance the method’s benefits: when backbone maintenance costs are 50 or 40 units, total system costs decrease by 10 % and 30 %, respectively, demonstrating significant economic and operational advantages. Moreover, the degradation-mitigation function is particularly advantageous in low-shock environments.
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