GERT analysis of the deferred life test sampling plan based on gamma failure Online publication date: Mon, 04-Apr-2016
by D.K. Gangeshwer; Gauri Shankar
International Journal of Quality Engineering and Technology (IJQET), Vol. 5, No. 3/4, 2015
Abstract: This paper presents graphical evaluation and review technique (GERT) analysis of the deferred life test sampling plan based on gamma failure. GERT approach which has been successfully used by Ohta (1978) for studying some quality control problems. The idea of using what is known as deferred sampling plan is due to Vaerst (1980). A brief account of GERT methodology and its application in quality control has been given by Shankar (1993). The advantage of the GERT analysis in the present context is two folded. Firstly, this procedure gives a visual picture of the dynamics of the inspection system and secondly, it offers a through characterisation of the plan. The formula of operating characteristics (OC) function and average sample number (ASN) function is derived and illustrated numerically. Lastly, tables have been provided to determine the smallest sample size n necessary to assure a certain mean life or quality of the product.
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