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A random forcing, with a bandwidth of 0-30Hz, is applied to a structure. The response is measured and converted to the frequency domain, and

A random forcing, with a bandwidth of 0-30Hz, is applied to a structure. The response is measured and converted to the frequency domain, and the mobility Nyquist plot is shown below. How many modes in this system have a natural frequency below 30Hz? Note that all modes below 30Hz have a non-zero modal participation coefficient. Imag -0.1 -0.2 0.3 0.2 0.1 0 -0.3 -0.2 0 0.2 0.4 0.6 Real

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