By R. D. Leitch
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Extra resources for Basic Reliability Engineering Analysis
It is no use a car carrying a spare if the driver is unable to change the wheel. 3. k-out-of-n systems. In a way these are systems that are part way between series and full redundant systems. There are η components available, of which k are needed for the system to run Reliability block diagrams 41 properly. They can be hot or cold redundant. The car's spare is an example of a four-out-of-five system, as any four of the five tyes is sufficient for the car to function. In this book we shall only analyse l-out-of-n hot redundant systems.
Suppose that it takes on average one hour to collect together the tools, men and equipment needed for a repair (sometimes called the logistic delay), and that the M T T R is 13 hours, making an average downtime of 14 hours. Then the M T B F that is needed to give an availability of 9 3 % is 186 hours. Other questions can be asked to determine the suitability of this figure. W h a t is the reliability of the generators? T o answer that question we must know how long the liner will be at sea. The time between planned maintenance is to be six weeks, we are told.
E. the probability of failure in the interval from time t until time t + χ depends only on x, the length of the interval, and not on i, the age of the item. This last statement certainly does not apply to many components, particularly mechanical items that are subject to wear. However, there are more complex models discussed below. The Weibull distribution For this model we put λ proportional to a power of t. where : β = the shape parameter y = the scale parameter, or characteristic life. 32. There are good reasons for using this distribution, some analytic, some heuristic: 1.