Selective Maintenance for a Multistate System Considering Energy Loss and Environmental Effect

With the increasing energy loss and environmental pollution caused by engineering systems, energy conservation and environmental protection have received more attention in industry environments. Based on this consideration, this paper introduces energy loss and environmental effect into the selective maintenance for a multistate system. According to the relationship between energy loss and system degradation, as well as the relationship between environmental pollutant discharge and system degradation, the energy loss and environmental effect models are proposed, respectively. With these models used as a basis, the selective maintenance model for a multistate system that considers energy loss and environmental effect is constructed, and a differential evolution algorithm is employed to solve the resulting maintenance strategy optimization problem. Finally, with a coal transportation system taken as an example, the energy loss and environmental effect models proposed in this paper are verified by comparison with the Monte-Carlo simulation method. Based on this, analyses of the selective maintenance strategy optimization are carried out to demonstrate the effectiveness of the proposed selective maintenance model and optimization method. The analysis results have engineering significance for how to introduce energy loss and environmental effect into the selective maintenance strategy optimization for a multistate system.