The Static Deflection Method

The static deflection method can be used for estimating the fundamental frequency of a grounded dynamic system. A 1 G body load is applied to the system for this analysis.

The method can be used as a “ballpark” check for finite element models in conjunction with modal analysis.

Here is a tutorial paper.

The paper also demonstrates the use of the static deflection shape as the starting vector for the inverse power iteration method for obtaining a better estimate of the fundamental frequency.

Matlab script: inverse_power_iteration_manual.m

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– Tom Irvine

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