Author : A. Janikiram, B. Venkata Ramudu and Y. Krishna Reddy

This paper studies a replacement policy (N1, N2) for a series repairable system consisting of two non-identical components and one repair man. It is assumed that each component after repair in the system is not ‘as good as new‘ and the successive working times form a decreasing alpha-series process while, the successive repair time’s form an increasing geometric process and both the processes are exposing to exponential failure law. Under this assumption by using a monotone process repair model, a replacement policy (N1, N2) based on the number of failures of component 1 and component 2 respectively is considered. An explicit expression for the long run expected cost rate is derived and the corresponding optimal replacement policy (N*1, N*2) is obtained such that the long run expected cost per unit time is minimized. Finally, numerical results are provided to highlight the obtained theoretical results. Numerical results are also exhibited by the graphically.

Keywords: Long-run Average, Cost Rate, Geometric Process, α-Process, Renewal Theorem and Mean Time to Failure (MTTF).

Article published in International Journal of Current  Engineering  and Technology, Vol.3,No.4(Oct- 2013)