عنوان مقاله :
طراحي بهينهي آزمونهاي زوال تسريع شدهي مخرب با حضور ريسكهاي رقابتي
پديد آورندگان :
آگاه، مرتضي دانشگاه علم و صنعت ايران - دانشكده مهندسي صنايع، تهران , نورالسنا، رسول دانشگاه علم و صنعت ايران - دانشكده مهندسي صنايع، تهران , صبري لقائي، كاميار دانشگاه صنعتي اروميه - گروه مهندسي صنايع، اروميه
كليدواژه :
قابليت اطمينان , آزمونهاي زوال تسريع شدهي مخرب , ريسكهاي رقابتي , طرح آزمون بهينه
چكيده فارسي :
آزمونهاي زوال تسريع شده ابزاري كارآمد براي ارزيابي طول عمر محصولات با قابليت اطمينان بالا هستند. براي بسياري از محصولات زوال يك محصول ناشي از چندين سازوكار خرابي است؛ بهعبارت ديگر چندين سازوكار خرابي براي خراب شدن محصول با يكديگر رقابت ميكنند كه اين موضوع با عنوان ريسكهاي رقابتي مطرح ميشود. همچنين در بسياري از كاربردها، فرايند اندازهگيري زوال منجر به تخريب مشخصات فيزيكي و شيميايي واحدهاي آزمون ميشود كه با عنوان آزمونهاي زوال تسريع شدهي مخرب (ADDT) مطرح ميشوند. مشخصات اندازهي كل نمونه، توالي اندازهگيريهاي مخرب، تعداد اندازهگيريها در هر سطح تنش و متغيرهاي تصميمگيري ديگر در طراحي و اجراي مؤثر ADDT اهميت دارند. در اين تحقيق يك طرح آزمون بهينه براي آزمون ADDT با حضور ريسكهاي رقابتي با در نظر گرفتن محدوديت هزينه و با كمينه كردن واريانس مجانبي براورد بيشينهي درستنمايي چندك pام توزيع زمان شكست در شرايط استفاده ارائه شده است.
چكيده لاتين :
Accurate prediction and evaluation of products reliability is one of the concerns of the companies for technical and managerial decisions. In this regard, failure data of products are used for reliability estimation. However, for products with high reliability, these data require a very long time and a large number of test units that is usually costly and impossible. Therefore, optimal usage of resources such as test units, time and facilities is necessary. Accelerated reliability tests are usually used for gathering failure data of products. However, for products with high reliability no failure or few failures may happen even by accelerated methods. So, evaluation of the products reliability just with using traditional life tests is difficult because it only
records the time of failures. Therefore, measuring the degradation process have been proposed as an alternative to failure time data to obtain fast and convenient data in manufacturing industries. Accelerated Degradation Tests (ADTs) are useful tools in evaluating lifetime of high reliability products. Many products degrade due to multiple failure mechanisms. In other words, multiple failure mechanisms (competing risks) compete to put an end to the life of a product. In some applications, the process of degradation measurement destructs physical and chemical characteristics of test units. This kind of accelerated test is called Accelerated Destructive Degradation Test (ADDT). In applying these tests resource and estimation issues should be taken into consideration. Sample size, sequence of destructive measurements, number of measurements in each stress level, and other decision variables are important in effectively designing and implementing an ADDT. Therefore, in this paper, the optimal design of an ADDT in presence of competing risks is studied. In this regard, asymptotic variance of the failure time quantile is minimized. A sensitivity analysis on the results is reported to evaluate the robustness of the results to model parameters.
عنوان نشريه :
مهندسي صنايع و مديريت شريف