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RE: Table 16-O - Horizontal Force Factors, ap and Rp

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>quite of bit
>of analysis is in order to figure out the period
Not so much. The unit itself is probably rigid and the only significant 
compliance is in the mounting. So it's just a simple spring-mass system T 
= 2 pi*SQRT(m/k). Make sure you figure in all the stiffness between the 
machine and ground and check in all three coordinate directions. 

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