Fig. 2
From: A new class of survival distribution for degradation processes subject to shocks
Simulated paths of system strength Y(t) when a Fréchet shock process is superimposed on several alternative degradation processes W(t). Each illustration has the same simulated shock stream, generated with α=1 and β=1.2, and the same initial strength y0=20. The panels show, respectively,a system with: a constant intrinsic strength (no degradation); b deterministic exponential degradation (λ=−0.1), c Wiener degradation (μ=−0.02, σ=0.1); and d gamma degradation (ζ=2, η=20)