By R.C. Mishra
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Sample text
The function, which assigns numbers to events, is called as random variable. This is neither random nor a variable in real sense. In the real world random variable is a ordinary variable which is selected randomly. In other words, once a random variable is well defined, we may speak of any value in the range of the random variable as if it were actually the event. It makes sense, thereby, to speak of the probability that a random variable, X, equals some particular number. It is important to note that, values of random variables have probabilities associated with them only because the values correspond to events, which deserve the probability directly.
The failure pattern can be obtained from field data, which are collected from the history cards of the equipment/system. In some cases, it is desired to identify the failure indicating parameters before actual failure of the equipment/ system takes place, as the past information on the subject matter is not available. The methods employed for ascertaining such values are termed as hazard/failure functions and are of immense help for the calculation of reliability. This will also help to determine failure density functions and failure distributions.
Highlight the influencing factors associated with failures. With the help of an example explain data failure analysis. What is the significance of hazard rate in mechanical systems? Write the importance of human factors in equipment failures. Define hazard rate. Explain their application to the reliability of components and repairable systems. Discuss the plausibility of the ‘Bath tub curve’ in both contexts. This page intentionally left blank Maintainability 21 3 Maintainability INTRODUCTION Maintainability is a characteristic of equipment design and installation which is expressed in terms of ease and economy of maintenance, availability of equipment/system, safety, and accuracy in the performance of maintenance actions.
