Abstract

PROBABILISTIC MODELING OF FAILURE DISTRIBUTION AND RELIABILITY ANALYSIS OF SMALL WELDING MACHINE

UDOH, N. S. (Ph D)

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Abstract The need for performance evaluation and planned maintenance of industrial machines is an imperative for reliability study. This ensures that users have needed information on the likelihood of failure, when to repair and how long the repair would last. In this work, the failure distribution of a locally fabricated welding machine was shown to follow gamma distribution with shape parameter, and scale parameter, using the chi squared goodness-of-fit test with the aid of easyfit (5.6) software. Failure density function, distribution function and failure rate were obtained. Also, the following reliability indices were obtained using mathematical expressions; mean time to repair (MTTR=1802 hours), mean time between failure (MTBF = 3393 hours) and the availability factor, A = 95.5% while the maintainability factor is M=4.5%. The probability functions of the failure distribution gave apt description of the failure behavior of the machine while the reliability indices obtained show that the small welding machine is in good working condition. These were complementarily used to formulate a maintenance policy for effective maintenance of the machine. Keywords: Reliability, Small welding Machine, Failure rate, Probability functions, Gamma Distribution

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