8. Assessing Product Reliability
8.1. Introduction

What are some basic repair rate models used for repairable systems?

Models for repair rates of repairable systems $$N(t)$$, $$M(t)$$, and $$m(t)$$ were defined in the section on Repair Rates. Repair rate models are defined by first picking a functional form for $$M(t)$$, the expected number of cumulative failures by time $$t$$. Taking the derivative of this gives the repair rate model $$m(t)$$.

In the next three sections we will describe three models, of increasing complexity, for $$M(t)$$. They are: the Homogeneous Poisson Process, the Non-Homogeneous Poisson Process following a Power law, and the Non-Homogeneous Poisson Process following an Exponential law