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Condition-based Maintenance Modeling and Optimization for Single-unit System with Multiple Competing Processes

GE Enshun, LI Qingmin, PENG Yingwu, WANG Shen   

  1. Department of Weaponry Engineering, Naval University of Engineering, Wuhan 430033, China
  • Received:2012-04-17 Revised:2012-09-10 Online:2013-03-25 Published:2013-03-29
  • Supported by:

    National Defence Pre-research Foundation of China (51304010206, 51327020105)

Abstract:

In most practical situations of equipment work, the system does not only degrade with use and age, but is also subject to traumatic events or shocks which lead to a sudden failure; that is, system failure is due to both deterioration and shock events. Focusing on the actual problem of maintenance engineering, a new condition-based maintenance model is established based on the sequential inspection policy and multi-level control-limit rule for a single-unit system which is subject to both the deterioration process and shock process. The competing and dependent failures due to deterioration and shock are considered. A mathematical model for the deteriorating system cost is derived under a pre-selected maintenance policy, and the long-run cost rate can be minimized by a joint optimization of the maintenance structure thresholds. Through a numerical example, the proposed model is compared with the maintenance model using periodically inspection policy, and the validity and superiority of the model are proved.

Key words: multiple competing processes, multi-level control-limit, maintenance, long-run cost rate, optimization

CLC Number: