Hi Brett,
That’s a great reference =
work.
I have another old reference from a class long =
ago.
“Vibration Analysis”, by Vierch, Copyright 1967, Library of
Congress Number 67-16234. The last chapter covers simulation by =
analog
computer and then ends with some fortran computation of multi-mass
systems. I see it is still available from antique book dealers on
line. Though it is not an in depth study it provides a good intro =
to
problem setup and scaling tasks when using an analog computer. I =
remember
enjoying the lab classes but not many of the details. =
I was reading some of the info on LIGO recently and =
it
appears there is again use for some of this. As I understood the =
paper,
the concept is to run a simulation of the system behavior in parallel =
and
compare the simulation to the real time measured response. The =
feed back
loop is then constructed as a smooth predicted value. This =
prevents amplification
of noise developed in the actual system from feeding back into future =
amplified
error.
Randy