32 Material Characterization of Gyroscope Isolator Using Modal Test Data 347 Fig. 32.9 First six natural frequencies and corresponding mode shapes of gyroscope B from modal tests, washers used When the FRFs of each boundary condition are assessed, significant effect of using washers is observed. Other than the notable change in the natural frequencies, response of the system at lower frequencies is considerably higher when washers are used. This shows that use of washers is essential in model correlation while it is not recommended in field use due to high response level at first visible mode.
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