This is just an Excerpt from a larger document, click here to view the entire document.Numerical Examples
Let a parallel system be composed of n = 2 identical components, each with FR λ = 0.01 and mission time T = 10 hours, only one of which is needed for system success. Then, total system reliability, by both calculations, is:
Mean Time to Failure (in hours):
The failure (hazard) rate for the two-component parallel system is now a function of T:
This system hazard rate λs(T) can be calculated as a function of any mission time T, as shown in Figure 4.
Figure 4. Plot of the Hazard λs(T) as a Function of Mission Time T. Hazard Rate λs(T) increases as time T increases. This plot can be used to find the λs(T) required to meet a Mission Time of T. Say T = 10, then λs(T) about 0.0018 (Click to Zoom)
