An accelerated life test plan for a two-component parallel system under ramp-stress loading using masked data
International Journal of Quality & Reliability Management
ISSN: 0265-671X
Article publication date: 5 March 2018
Abstract
Purpose
Most of the literature on the design of accelerated life test (ALT) plan focus on a single system (subsystem) totally disregarding its internal configuration. Many a times it is not possible to identify the components that cause the system failure or that the cause can only be identified by a subset of its components resulting in a masked observation. The purpose of this paper is to deal with the planning of ramp-stress accelerated life testing for a high-reliability parallel system comprising two dependent components using masked failure data. Such a testing may prove to be useful in a twin-engine aircraft. A ramp-stress results when stress applied on the system increases linearly with time.
Design/methodology/approach
A parallel system with two dependent components is taken with dependency modeled by Gumbel-Hougaard copula. The stress-life relationship is modeled using inverse power law, and cumulative exposure model is assumed to model the effect of changing stress. The method of maximum likelihood is used for estimating design parameters. The optimal plan consists in finding optimal stress rate using D-optimality criterion.
Findings
The optimal plan consists in finding optimal stress rate using D-optimality criterion by minimizing the reciprocal of the determinant of Fisher information matrix. The proposed plan has been explained using a numerical example and carrying out a sensitivity analysis.
Originality/value
The model formulated can help reliability engineers obtain reliability estimates quickly of high-reliability products that are likely to last for several years.
Keywords
Acknowledgements
There is no potential conflict of interest in the research. This research is supported by R&D grant received from the University of Delhi, India. The authors are grateful to the referees for their valuable comments.
Citation
Srivastava, P.W. and Savita, S. (2018), "An accelerated life test plan for a two-component parallel system under ramp-stress loading using masked data", International Journal of Quality & Reliability Management, Vol. 35 No. 3, pp. 811-820. https://doi.org/10.1108/IJQRM-04-2017-0072
Publisher
:Emerald Publishing Limited
Copyright © 2018, Emerald Publishing Limited