Kharazmi University International Journal of Supply and Operations Management 2383-1359 6 2 2019 05 01 A Multi-attribute Approach for Simultaneous Determination of Preventive Replacement Times and Order Quantity of Spare Parts 110 125 2782 10.22034/2019.2.2 EN Seyed Mehran Hoseini Department of Industrial Engineering, Isfahan University of Technology, Isfahan, Iran Naser Mollaverdi Department of Industrial Engineering, Isfahan University of Technology, Isfahan, Iran S. Reza Hejazi Department of Industrial Engineering, Isfahan University of Technology, Isfahan, Iran Mohammad Taghi Rezvan Department of Industrial Engineering, Faculty of Engineering, University of Kashan, Kashan, Iran Journal Article 2018 08 05 One of the most important activities in preventive maintenance is replacement of spare parts prior to failure. The aim of this paper is to propose an approach which determines jointly the preventive replacement interval and the spare parts inventory by considering different criteria and interacting with decision makers. In this approach, preventive replacement intervals, determined by experts of production and maintenance, are ranked by analytical hierarchy process (AHP). Criteria such as cost per unit of time, availability, remaining lifetime, and reliability are used. Then, a mixed integer nonlinear multi-objective model presented that it simultaneously specifies the period of preventive replacement and the required number of spare parts. This model considers the mentioned criteria and the inventory control costs of spare parts as different objective functions. Since, the solution of the problem depends on the decision maker’s strategy, it need interact with the decision-makers and consequently the proposed model could be solved using goal programming approach. The applicability of the proposed approach is illustrated by two numerical examples. The effect of key parameters on the optimal decisions is investigated for two examples. http://www.ijsom.com/article_2782_60243f9b1ac2dba11ff8131c8f4431e0.pdf