The following animation file is useful for demonstrating the Shock Response Spectrum (SRS) concept : HS_SRS.avi
Each system is subjected to a common base input which is a 1 G, 1 second half-sine pulse.
Each system has an amplification factor of Q=10.
The systems are arranged in order of ascending natural frequency.
Assume that each mass is the same. Thus, the system on the far left has a soft spring, representing isolation. The system on the right behaves nearly as a hard-mounted system relative to the input pulse.
The SRS is the peak response of each system as a function of natural frequency and damping.
The soft-mounted mass have very little absolute motion, but it has a high relative displacement and spring compression.
The hard-mounted system tracks the base input with nearly unity gain and will very little spring compression.
The middle systems have both high absolute and relative motion.
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– Tom Irvine