By B.S. Dhillon Ph.D.
This ebook offers the ideas and basic tools of estimation and calculation wanted via maintainability engineers. It additionally covers the administration of maintainability efforts, together with problems with organizational constitution, price, and making plans tactics. Questions and difficulties finish each one bankruptcy.
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Additional info for Engineering Maintainability:: How to Design for Reliability and Easy Maintenance
MTBF is the mean time between failures. MTTR is the mean time to repair. Achieved availability is the probability that an item, when used under designed conditions in an ideal support environment, will perform satisfactorily. It includes both active repair time and preventive maintenance time but excludes administrative and logistic delay times. 35) where ACH is the achieved availability. MTBM is the mean time between corrective and preventive maintenance actions. Operational availability is the probability that an item, when used under designed conditions in an actual operational environment, will perform satisfactorily.
26) tb-le-ct r(b) where b is the shape parameter. c is the scale parameter. 28 becomes the maintainability function for the exponential distribution. 27 are as follows: 9 b = positive integer values ob=0,1,2,... 5 9 r(b) = ( b - 1)! F(b + 1) = b! 5) = Maintainability Measures, Functions, and Models ,13 Erlangian Distribution This is a special case of the gamma distribution in which the gamma distribution shape parameter takes positive integer values. 27 yields r(b) = (b - 1)! 32) (b - ~)! 33) i--b SYSTEM EFFECTIVENESS A N D RELATED A V A I L A B I L I T Y A N D D E P E N D A B I L I T Y MODELS System effectiveness is the extent to which a system, product, or piece of equipment is capable of carrying out its assigned functions.
M. 16) dt Weibull Distribution This is a distribution sometimes used to represent field maintenance times for complex electronic equipment. Under certain circumstances, the distribution of administrative delay times for field maintenance can be described by using the Weibull distribution . 17) where y is the scale parameter. b is the shape parameter. 12. 18 becomes the maintainability function for Rayleigh distribution. In this case, the equipment repair time is increasing at a linear rate.
Engineering Maintainability:: How to Design for Reliability and Easy Maintenance by B.S. Dhillon Ph.D.