Fig. 3
From: A new class of survival distribution for degradation processes subject to shocks
Survival curves for two shock-degradation processes. Each illustration has the same shock stream parameters α=1 and β=1.2, and the same initial strength y0=20. The degradation processes are: a a Wiener degradation process (μ=−0.02, σ=0.1) and b a gamma degradation process (ζ=2, η=20). Each panel shows survival curves corresponding to a lower bound, a 4th order approximation to the true curve based on a Taylor series expansion, and an empirical estimate based on a sample of 1000 simulated cases