An integrated bi-objective model under warranty, technology level, and pricing by considering pre-sale and post-sale costs

Due to the imperfection of processes, quality some products may be unsatisfactory. Moreover, equipment failure can stop production for a while. Therefore, integrating triple concepts quality, maintenance, and inventory control has attracted attention. Triple are constituents pre-sale costs. Selling price warranty generally considered maintain market share maximize producer's profit. Quality maintenance in should reduce post-sale costs warranty. Despite interactions, with been neglected. We integrate quadruple bi-objective model profit minimize under free minimal repair policy. A non-central chi-square (NCS) chart monitors mean variance, simultaneously. The technology level is also increasing product reducing failures during period. its high complexity, solved by particle swarm optimization algorithm. proposed applied through numerical example three comparative studies. results indicate better performance NCS chart, superiority versus single-objective optimization, importance presale postsale