Estimating Parameters in Repairable Systems Under Accelerated Stress

In this paper, the imperfect maintenance model and proportional intensity model are considered for the repairable systems under accelerated stress. The age reduction model (Malik’s model) is assumed for imperfect maintenance. The stress acts multiplicatively on the baseline cumulative intensity. The log-likelihood function is derived and a maximizing procedure is proposed. In simulation studies, we investigate the accuracy and some properties of the estimation method.