Imperfect preventive maintenance for numerical control machine tools with log-linear virtual age process
来源期刊：中南大学学报(英文版)2014年第12期
论文作者：GUO Jun-feng(郭俊锋) RUI Zhi-yuan(芮执元) FENG Rui-cheng(冯瑞成) WEI Xing-chun(魏兴春)
文章页码：4497 - 4502
Key words：reliability; imperfect preventive maintenance; virtual age; log-linear process; failure intensity
Abstract: Based on the log-linear virtual age process, an imperfect preventive maintenance policy for numerical control (NC) machine tools with random maintenance quality is proposed. The proposed model is a combination of the Kijima type virtual age model and the failure intensity adjustment model. Maintenance intervals of the proposed hybrid model are derived when the failure intensity increase factor and the restoration factor are both random variables with uniform distribution. The optimal maintenance policy in infinite time horizon is presented. A numerical example is given when the failures of NC machine tools are described by the log-linear process. Finally, a discussion is presented to show how the optimal results depend on the different cost parameters.
GUO Jun-feng(郭俊锋), RUI Zhi-yuan(芮执元), FENG Rui-cheng(冯瑞成), WEI Xing-chun(魏兴春)
(School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou 730050, China)
Abstract:Based on the log-linear virtual age process, an imperfect preventive maintenance policy for numerical control (NC) machine tools with random maintenance quality is proposed. The proposed model is a combination of the Kijima type virtual age model and the failure intensity adjustment model. Maintenance intervals of the proposed hybrid model are derived when the failure intensity increase factor and the restoration factor are both random variables with uniform distribution. The optimal maintenance policy in infinite time horizon is presented. A numerical example is given when the failures of NC machine tools are described by the log-linear process. Finally, a discussion is presented to show how the optimal results depend on the different cost parameters.
Key words:reliability; imperfect preventive maintenance; virtual age; log-linear process; failure intensity
