peteroznewman
Subscriber
nThat looks like a reasonable Free-Free model and it is correct that the first nonzero frequency mode is the mass pumping against the springs. You can calculate that frequency by hand since you know the mass and the spring rate using f = sqrt(k/m)/2pi.nIn a Modal analysis, there are no loads, so you don't have gravity deflecting the springs to a static offset, but in a Static analysis you do.nIn a physical experiment, the first six modes in the analysis won't be measured. Mode 7 in the analysis will be the first mode that can be measure by an accelerometer.n
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