Article citation info:1. Introduction
The contextThe search for highly reliable systems has been intensifying. Such systems can be identified by implementing practices that reduce losses due to failures. Thus, maintenance plays a key role in organizations because it can significantly contribute to reducing both costs and failures, irrespective of the timing of failures during the useful life of the component. Preventive maintenance takes effect when the use of a particular policy enables the reduction of potential failures. Because these policies widely influence the safety and economy of operations, they are very important to improve the performance and reduce the cost of any producing systems.Burn-in procedures consist of testing a new component for a given period before its active life in order to prevent early failures.Burn-in has been studied by several researchers, including Kuo and Kuo [24], who presented a review of the main aspects of the procedure. Furthermore, Block and Savits [2] provided optimization examples and criteria. Regarding the adopted criteria, Block et al.[3] balanced residual life and variation (conditional survival) in the criterion of burn-in via the residual coefficient of variation, whereas Baskin [1] analysed burn-in using the general law of reliability. Perlstein et al.[29] analysed the cost of the optimal duration of burn-in, the components of which were characterized by hybrid exponential distributions using Bayesian theory. Restrictions can be added, as demonstrated by Chi and Kuo [13], who proposed a model to minimise costs under two restrictions, reliability and capacity.The use of a combined policy is sometimes more effective than the use of a pure policy [13]. An example of combined policy is presented by Golmakani and Fattahipour [19], who aimed to determine the best period for inspection and replacement in the condition-based maintenance. However, research studies involving combined policies of burn-in with replacement are rare, and the ones that stand out are those by Jiang and Jardine [21], Canfield [5], Thangaraj and Rizwam [32], Drapella and Koznik [15].A heterogeneous population of components that are present early and later fail related to exclusives failure models demands that the policy is adaptable. Therefore, a pure policy or the use of only one procedure is not effective.
The present contributionDecisions regarding the burn-in and maintenance decisions are of great interest to researchers and decision-makers, and finding alternatives that improve the performance of managed systems is a challenge.CAvAlCAnte CAv, do nAsCimento tG, lopes Rs. multi-attribute Utility theory analysis for burn-in processes combined with replacement. eksploatacja i niezawodnosc -maintenance and Reliability 2016; 18 (4): 599-605, http://dx.doi.org/10.17531/ein.2016.4.15 The vast majority of research studies addresses the problem of burn-in with a single objective function. Although the adoption of combined policies represents an advance, combined procedures sometimes do not provide imp...