Application of Statistical Quality Control in Testing Labs for Estimation of Machine Interference

Application of Statistical Quality Control in Testing Labs for Estimation of Machine Interference

Nitin K. Mandavgade (Nagpur Institute of Technology, India), Santosh B. Jaju (G. H. Raisoni College of Engineering Nagpur, India) and Ramesh R. Lakhe (Shreyas Quality Management System, India)
DOI: 10.4018/978-1-5225-5406-6.ch005

Abstract

The performance and maintenance of testing laboratories is a prime issue. The quality of coal test results not only depends on performance of individual results but it also depends on the performance of various tests in the same laboratory. Machine interference is a significant problem in many manufacturing system and testing equipment. The variation of results for testing equipment may be due to various factors which need to calculate the uncertainty of measurement to show the accuracy of the machine. In case of coal testing laboratory, the plant layout and surrounding environment affects the performance of the system. The machine interference comes under variable causes which may affect the result. This chapter proposes a methodology for constructing system performance measures, finding out the various factors responsible for variations in result. The chapter deals with estimation of machine interference existence using variable control chart approach for coal testing equipment. The analysis of results for such machine interference will be useful and significant for system designers and practitioners.
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Identification Of Factors

The uncertainty of measurement gets affected by qualitative factors as well as quantitative factors. The effects of quantitative factors can be determined using analytic approach and data from calibration certificates, instruments manual, etc. (Mandavgade et al 2011a). In case of qualitative terms, UOM is affected by various terminologies applicable to that particular case. According to the expert suggestions or opinions, questions filled by different people in particular field and practical experience of the author in field, some of the qualitative factors applicable for M/s. S.K. Mitra coal testing laboratory, Nagpur (India) are as below (Figure 1):

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