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PSD from response spectra

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I'm looking to work out some vibration testing issues with for 
conformance with an IEEE spec for seismic qualification. Anyone know of 
an archive which might have software to derive a PSD curve from a seismic 
response spectrum? SIMQKE could do this, but I'd like to get C language 
source code so I could put it on my Mac. Lacking a software archive does 
anyone know of a reference for the math involved?

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)