Abstract
We model the influence of opportunities in a hybrid inspection and replacement policy. The base policy has two phases: an initial inspection phase in which the system is replaced if found defective; and a later wear-out phase that terminates with replacement and during which there is no inspection. The efficacy of inspection is modelled using the delay time concept. Onto this base model, we introduce events that arise at random and offer opportunities for cost-efficient replacement, and we investigate the efficacy of additional opportunistic replacements within the policy. Furthermore, replacements are considered to be heterogeneous and of variable quality. This is a natural policy for heterogeneous systems. Our analysis suggests that a policy extension that allows opportunities to be utilised offers benefit, in terms of cost-efficiency. This benefit is significant compared to those offered by age-based inspection or preventive replacement. In addition, opportunistic replacement may simplify maintenance planning.
Highlights
Preventive maintenance is widely accepted as an effective way of reducing the total cost of ownership of industrial assets (Xia et al 2015)
The main objectives of maintenance management are related to increasing the reliability and availability of systems and to reducing the cost of maintenance (Berrade et al, 2013; Zheng, et al, 2016)
Opportunistic maintenance has been applied to several technical systems such as: wind turbines (e.g. Ding and Tian, 2011; Shafiee et al, 2015; Yildirim et al, 2017); gas turbine and compressor systems (e.g. Hu and Zhang, 2014); feed-water pump systems in nuclear power plants (e.g. Nilsson et al, 2009); cogeneration systems (Cavalcante and Lopes, 2015); port transportation
Summary
Preventive maintenance is widely accepted as an effective way of reducing the total cost of ownership of industrial assets (Xia et al 2015). Some stops can create opportunities to do preventive maintenance at a lower cost or with less disruption than scheduled preventive maintenance (e.g. maintenance of a bottling sub-system on a soft-drinks production line when cold water supply is lost due to pump failure, Wang et al,, 2000) Based on this idea, opportunistic maintenance policies have been developed Interesting is that opportunities might be considered in the context of inspection maintenance, modelled through the delay time concept of Christer (1999) This connection is not well developed in the literature and there are few articles that address it (Wang and Christer, 2003; Berrade et al, 2017).
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