Characteristics of Reliability Designing and Planning
The following characteristics are often chosen for reliability designing and planning for maintenance of repairable equipment as these are found more suitable and meaningful.
It is the most frequent probable Time between Failures in a sample space of time domain.
T (mode) =α. (1 - 1/ β) 1/β
It is the median Time between Failure of an equipment among the sample space of time domain about a Weibull Distribution at Reliability (R) = 0.5.
T (median) =α. (- ln 0.5) 1/β
It is optimal Preventive Maintenance interval for a machine to be observed at a certain reliability values.
T (optional) =α. (1/ (β - 1)) 1/ β
The life (period) of equipment in which 63.2% of Weibull failures will occur. It is independent of shape parameter and reliability.
T (char) = α [its value is equal to alpha (α)].
It is the time at which 1 percent of the population will have failed at a reliability of 0.99.
B1 (life) =α. (- ln 0.99) 1/β
It is the time at which 0.1 percent of the population will have failed at a reliability of 0.999.
B .1(life) =α. (- ln 0.999) 1/β