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Response Spectra for Comparison of Severity of Dynamic Loads

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EZU is a Mechanical Engineer, Engineering Mechanics Expert, Stress and Dynamics Expert with world-class expertise in structural analysis, dynamics, shock and vibration problems, product design, failure analysis, computer modeling, and stress analysis.

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Classical Approach:

It has been common practice, in evaluating the severity of dynamic loads on any particular mechanical assembly, to perform the following analytical procedures:

1. For sinusoidal vibration, usually specified as excitation g-level as a function of excitation frequency, the structural response is estimated on the basis of an estimated transmissibility and a calculated or estimated natural frequency. 

2. For random vibration, usually specified as PSD (Power Spectral Density) as a function of frequency content, the structural response is estimated using the Miles equation (see below) and an estimated transmissibility and a calculated or estimated natural frequency. 

3. For shock loading, specified in a variety of formats (drop test, sinusoidal pulse, triangular pulse, pyrotechnic shock spectrum), a transient analysis is frequently performed to estimate the structural response.

4. The various structural responses are compared to determine which loading causes the highest stresses.  Then the structural design may be modified to assure adequate strength.  Sometimes an attempt is made to change the natural frequency so as to modify the dynamic stresses.  This can be a laborious process because a change in natural frequency might decrease one of the responses but increase another.

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