9054

8399

كارشناسي ارشد

صنايع

اصفهان: دانشگاه صنعتي اصفهان، دانشكده صنايع و سيستم ها

1392

يازده،85ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

مهدي بيجاري

26/3/93

فريماه مخاطب رفيعي، ناصر ملاوردي

مهندسي صنايع و سيستم ها

ID8399

Multi period Economic Production Quantity with common component Elahe Eshaghi e eshaghi@in iut ac ir Date of Submission 2014 01 22 Department of Industrial Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Mehdi Bijari bijari@cc iut ac irAbstractGlobalization of economy leads to create new markets for all industries and increasescompetitive pressures in this field The main goal of any companies is trying to fulfill theneeds of their customers without a lot of waiting time In the recent decade attention tocustomer service has increased The assemble to order ATO strategy requires that thebasic parts are produced in advance Products are manufactured once the order has beenreceived Use common component in an ATO system will increase the variety of productsand increase service levels In this study Economic Production Quantity with commoncomponent problem in ATO environment is investigated This is a two stage problem Onthe first stage before realizing the amount of demand and by service level concept theordering decision of each component are made On the second stage due to the sharing ofparts between products in every period after realizing demands should decide about howto allocate the common component to products when component shortages occur Inorder to obtain an optimal policy for allocating components to finished products twocases for entering demand to system is investigated In the first case the demands for allgoods interred simultaneously into the system The three policies solving second stagelinear programming ascending order of demands and fair allocation policy for allocatingcomponent to product were compared by means of simulation and statistical analyzes The best policy based on maximize the profit of the second stage problem is solvingsecond stage linear programming In the case it is assumed that the demands for finalproducts is dynamic and enter during period In this case two policies first stage shareand order entry demand for components allocation to final products were investigated According to the results has not significant different Because the model have zero onevariables the possibility of solving a large scale at the reasonable time is not possible Inorder to obtain a near optimal solution in a reasonable time heuristic methods are used tosolve the problem All heuristic approaches response in a reasonable time with less thanone percent away from the optimal solution Keywords Lotsizing Common component stochastic demand Simulation

مهدي بيجاري

فريماه مخاطب رفيعي، ناصر ملاوردي