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Dynamic Random Vibration - What are the proper units?

ptc-1731064
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Dynamic Random Vibration - What are the proper units?

I am working in in-lbf/sec. What does the base excitation need to be in? (G^2/Hz)? Thanks, Richard
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Yes, because that is how you define the amplitude of the Power Spectral Density curve, when you program a shaker to run a Random Vibration test.
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