8.
Assessing Product Reliability
8.1. Introduction 8.1.7. What are some basic repair rate models used for repairable systems?
|
|||
The Exponential Law is another flexible NHPP model |
An NHPP
with ROCOF or intensity function given by
$$ m(t) = \mbox{exp} \left(\alpha + \beta t \right) \,\, , $$
is said to follow an Exponential Law. This is also called the
log-linear model or the Cox-Lewis model.
A system whose repair rate follows this flexible model is improving if \(\beta\) < 0 and deteriorating if \(\beta\) > 0. When \(\beta\) = 0, the Exponential Law reduces to the HPP constant repair rate model |