compute FDS from PSD

Hi All,
I'm working on a project that requires me to compute (in MATLAB)
Fatigue Damage Spectrum for a band-limited random signal(200-400 Hz)
1. The original Time Signal.
2. From The Power Spectral Density (PSD) of the signal
I could compute FDS from time signal in MATLAB using the Rainflow
Algorithm. But I'm not able to find a way to compute it from the PSD
because various books I refered have a method to generate FDS from PSD
if the PSD consists of straight lines (or the PSD is constant int he
frequency range in my case (200-400 Hz)) but the psd I computed is not
a straight line (or constant) but varies for each frequency. So any
suggestion as to how to flatten the PSD or a generalised equation to
compute FDS from PSD will be of great help. Thanks in advance.
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