تعيين زمان اقتصادي وارانتي و قيمت محصول و تعداد مراكز ارائه خدمات وارانتي با در نظر گرفتن ارزش خالص فعلي توليد كننده و زمان انتظار مشتريان

Economic Design of Warranty Strategy Based on Warranty Time,Price,and Logistics Centers With Considering NPV and Waiting Time

مشتريان و سياست‌هاي توليد، در فضاي رقابتي توليد نقش بسزائي در سود‌آوري توليدكنندگان دارند. لذا دست‌يابي توام به اهداف مشتريان و سياست‌هاي توليد اقتصادي براي توليدكنندگان، بايكديگر در تعارض هستند. دراين مقاله با استفاده از مدل نمايي با m خدمت دهنده (M/M/m) به عنوان ابزاري براي تعيين رفتار مشتري در دراز مدت و تعيين جريان نقدي توليدكننده با در نظرگرفتن هزينه ساليانه تعمير هر خرابي، هزينه ساليانه ثابت (نگهداري و تعميرات) مركز و هزينه ساليانه انتظار مشتري در مقابل درآمد اوليه حاصل از فروش محصولات و استفاده از مفهوم ارزش خالص فعلي به طراحي مدلي دو هدفه براي تعيين متغير هاي تصميم؛ قيمت هر واحد محصول با احتساب وارانتي، نرخ ارائه خدمت در سال، مدت زمان اجراي سياست وارانتي بر حسب سال با هدف حداكثر سازي سود توليد كننده و حداقل سازي زمان انتظار مشتري در سيستم پرداخته شده است. در نهايت مدل رياضي طراحي شده با استفاده از الگوريتم NSGA-II حل گرديده و حساسيت مدل دو‌هدفه با در نظر گرفتن تغييرات پارامتر هايي مانند حجم توليد و درصد خرابي محصول، مورد بررسي قرار گرفته است.

The manufacturing competitive environment, customers on one hand, and policies affecting production, on the other hand have a considerable effect on the profitability of producers. Therefore, to achieve the combined goals of economic policy for our customers and manufacturers, are in conflict with each other. Using the techniques of net present value and economic concepts and applying probabilistic models to determine the behavior of the system will be less than these concepts are used as the research literature . In this study, using a two-objective mathematical model, a hidden agreement between manufacturer and consumer has been created to achieve their goals. Therefore, Queuing theory, and its equations and concepts that have been used as a tool to determine customer behavior in the long term with The purpose of economic feasibility and profitability for producers and reduce the waiting time for consumers. Given that the profitability of an investment plan for the manufacturer warranty policies is important, by Considering the cost of repairing any damage, fixed costs (maintenance and repair) center and customer waiting costs against the proceeds from the sale of products during the warranty has been investigated two-objective model for Determining the decision variables; the price per unit of product including warranty, Warranty period in years, number of After sales service centers service rate in warranty duration policies aimed at maximizing profits and minimizing waiting time of customers in the system. In cases where the models pose M/M/m to determine the behavior of the system is used in the NSGA-II to solve the two-objective is used and the sensitivity analysis model for volume product prices and product failure rate is investigated. Two-objective model presented in this study for all manufacturers product warranty terms offered to customers is suitable. An important result of this study is to achieve simultaneously the benefit of producers and consumers and creates interaction between them. So Manufacturer by increasing customers Satisfactions and decreasing his cost increase his profit and consumers with buying products with warranty increase his profits