# Availability and cost analysis of an engineering system involving subsystems in series configuration

Anuj Kumar (University of Petroleum and Energy Studies, Dehradun, India)
Sangeeta Pant (University of Petroleum and Energy Studies, Dehradun, India)
S.B. Singh (G.B. Pant University of Agriculture and Technology, Pantnagar, India)

ISSN: 0265-671X

Article publication date: 5 June 2017

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## Abstract

### Purpose

The purpose of this paper is to evaluate various reliability measures like availability, reliability, mean time to failure and profit function.

### Design/methodology/approach

The authors present a novel method for availability analysis of an engineering system incorporating waiting time to repair. The considered system consists of two subsystems, namely, A and B connected in series. The subsystem B has two identical units in standby arrangement. Each unit of the subsystem has two modes, i.e. normal efficiency or failed. The two standby units of the subsystem B are connected by an imperfect switching. The system is analyzed by supplementary variable technique, Laplace transformation and Gumbel-Hougaard family of copula.

### Findings

Numerical examples with a way to highlight the important results have been appended at last. Numerical calculation shows that availability and reliability of the system is decreasing with respect to time when failure rates are fixed at different values. Finally, cost analysis of system reveals that the expected profit decreases with increase in service cost.

### Originality/value

This paper presents a mathematical model in which an important aspect of switching has been taken into consideration, which is consistent with actual failures of switching by assuming two different types of failure between adjacent transition. It is evaluated with the help of the Gumbel-Hougaard family of copula.

## Citation

Kumar, A., Pant, S. and Singh, S.B. (2017), "Availability and cost analysis of an engineering system involving subsystems in series configuration", International Journal of Quality & Reliability Management, Vol. 34 No. 6, pp. 879-894. https://doi.org/10.1108/IJQRM-06-2016-0085

## Publisher

:

Emerald Publishing Limited