
For FullText PDF, please login, if you are a member of IEICE,
or go to Pay Per View on menu list, if you are a nonmember of IEICE.

Replacement and Preventive Maintenance Models with Random Working Times
Mingchih CHEN Syouji NAKAMURA Toshio NAKAGAWA
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E93A
No.2
pp.500507 Publication Date: 2010/02/01
Online ISSN: 17451337
DOI: 10.1587/transfun.E93.A.500
Print ISSN: 09168508 Type of Manuscript: PAPER Category: Reliability, Maintainability and Safety Analysis Keyword: replacement, random working time, minimal repair, imperfect PM, cumulative damage,
Full Text: PDF(234.2KB)>>
Summary:
This paper considers replacement and maintenance policies for an operating unit which works at random times for jobs. The unit undergoes minimal repairs at failures and is replaced at a planned time T or at a number N of working times, whichever occurs first. The expected cost rate is obtained, and an optimal policy which minimizes it is derived analytically. The imperfect preventive maintenance (PM) model, where the unit is improved by PM after the completion of each working time, is analyzed. Furthermore, when the work of a job incurs some damage to the unit, the replacement model with number N is proposed. The expected cost rate is obtained by using theory of cumulative processes. Two modified models, where the unit is replaced at number N or at the first completion of the working time over time T, and it is replaced at T or number N, whichever occurs last, are also proposed. Finally, when the unit is replaced at time T, number N or Kth failure, whichever occurs first, the expected cost rate is also obtained.

