首页|Allocating redundancy,maintenance and spare parts for minimizing system cost under decentralized repairs
Allocating redundancy,maintenance and spare parts for minimizing system cost under decentralized repairs
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Reliability-redundancy allocation,preventive maintenance,and spare parts logistics are crucial for achieving system reliability and availability goal.Existing methods often concentrate on specific scopes of the system's lifetime.This paper proposes a joint redundancy-maintenance-inventory allocation model that simultane-ously optimizes redundant component,replacement time,spares stocking,and repair capacity.Under reliability and availability criteria,our objective is to minimize the system's lifetime cost,including design,manufacturing,and operational phases.We develop a unified system availability model based on ten performance drivers,serving as the foundation for the establishment of the lifetime-based resource allocation model.Superimposed renewal theory is employed to estimate spare part demand from proactive and corrective replacements.A bisection algo-rithm,enhanced by neighborhood exploration,solves the complex mixed-integer,nonlinear optimization problem.The numerical experiments show that component redun-dancy is preferred and necessary if one of the following situations occurs:extremely high system availability is required,the fleet size is small,the system reliability is immature,the inventory holding is too costly,or the hands-on replacement time is prolonged.The joint allocation model also reveals that there exists no monotonic relation between spares stocking level and system availability.
system availabilityinstalled basedecen-tralized repairredundancy-maintenance-inventory modelsuperimposed renewal process
Tongdan JIN、Shubin SI、Wenjin ZHU
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Ingram School of Engineering,Texas State University,San Marcos,TX 78666,USA
School of Mechanical Engineering,Northwestern Polytechnical University,Xi'an 710072,China
Key Laboratory of Industrial Engineering and Intelligent Manufacturing(Ministry of Industry and Information Technology),Xi'an 710072,China
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