Maintenance Strategy Selection using Fuzzy Hierarchical Approach

In recent years, maintenance has been recognized as an effective and a significant improvement tool in the performance of equipments. Maintenance plays an important role in maintaining reliability, availability and quality of products, risk reduction, efficiency increase and safety, so maintenance and its strategies have a special place in the industry. A lot of researches show the necessity of using fuzzy sets in decision making problems due to its high flexibility. The choosing maintenance strategy is also a problem with so many uncertainties so using fuzzy sets seems to be very useful. The aim of this research is to provide a suitable mathematical decision making model for assessment and selection maintenance strategies by using hierarchical fuzzy Axiomatic Design (HFAD) and hierarchical fuzzy Topsis (HFTOPSIS) in Haft Almas Co. Since many criteria such as added value, safety, and … so are vital in the maintenance strategy selection, in this article first these criteria are investigated in the literature review and expert's opinions, then for obtaining the weights of criteria the FAHP method is used and finally the strategies are ranked through the applying HFAD and HFTOPSIS. The results of FTOPSIS and FAD were compared in selecting a maintenance strategy. The results of comparisons indicate the similarity of rankings by two techniques. Above techniques show that TPM alternative has superior to other strategies.