Evaluation of the Modal Coupling Effect in Midstory Isolation Systems Based on Random Vibration Analysis

<div>Variance ratios of absolute acceleration with various εls and εus (r1 = 0.8 and r2 = 0.7): (a) Rals for the lower mass, (b) Raiso for the isolation mass, and (c) Raus for the upper mass.</div>

Shock and Vibration

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Figure 4

Figure 4: Evaluation of the Modal Coupling Effect in Midstory Isolation Systems Based on Random Vibration Analysis 