Use of Statistical Quality Control for Estimating the Machine Interference

Use of Statistical Quality Control for Estimating the Machine Interference

Nitin K. Mandavgade (G.H. Raisoni College of Engineering & Priyadarshini College of Engineering, Nagpur, India), S. B. Jaju (G.H. Raisoni College of Engineering, India) and R. R. Lakhe (Shreyas Quality Management System, India)
DOI: 10.4018/ijmtie.2012010102
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Abstract

Although it is important to test quality of coal used in thermal power station, it is more important to know how to interpret the data from the results. No single test can be used independently to determine the quality of coal. Machine interference is a significant problem in many manufacturing system and testing equipments. The variation of results for testing equipments 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 cause which may effect on the result. This paper, proposes a methodology for constructing system performance measures, finding out the various factors responsible for variations in result. The study is based on performance of coal used in thermal power station in India. The paper deals with estimation of machine interference existence using variable control chart approach for coal testing equipments. The paper gives the solution for the coal testing laboratory to improve their performance. The analysis of results for such machine interference will be useful and significant for system designers and practitioners.
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2. Factors Inventory

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, Jaju, & Lakhe, 2011a). In case of qualitative terms, UOM is affected by various terminologies applicable to that particular case. According to the expert suggestions or opinions, questioners filled by different peoples in particular field and practical experience of the author in field, some of the qualitative factors applicable for coal testing lab are as below:

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