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Hydraulic actuator frequency response

Hello,

We are using a Parker actuator (drawing of which can be provided if needed) along with a MTS servovalve to run shake table. On obtaining the frequency response experimentally, two peaks are observed. One at the oil-column frequency of the system, and one at a lower frequency of 15Hz. I was wondering if someone could provide more insight on why the peak at 15Hz exists and how to eliminate the same.

Thanks.

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