Effect of Time on Shock Spectra and
System Dynamic Response
Dr. Rudy Scavuzzo, The
The naval shock spectrum is the maximum response of a single degree-of-freedom system to a transient base input motion. For ship keel motion and the high impact shock imparted to equipment on the Light Weight Shock Test machine, the Medium Weight Shock Test machine, and the Floating a Shock Platform and similar test devices, the peak spectral response occurs very early in the shock transient. As a result normal damping associated with tested equipment can be neglected and the shock spectrum is normally calculated neglecting damping. However, if a test device is used that envelops a desired spectrum, such as the Chirp Test, time effects may be significant. In this paper, the shock spectra are presented on a three dimensional plot of magnitude, frequency and time of peak response. Also, the response of a multi-degree-of-freedom system is analyzed using different transients to evaluate this effect of time in the shock input.
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