Abstract
A dynamic absorber can be combined with a transducer to shift the antiresonant frequency by inserting an electrical element across the transducer terminals. For a disturbance with a slowly varying frequency, tracking can be effected by means of, e.g., a digital logic circuit that estimates the frequency, assigns it to a certain frequency interval, selects a corresponding interval, and selects a corresponding electrical termination to put across the transducer. At any given frequency setting, the total Q is high to obtain good suppression, thus running the chance of creating an “ear” in the frequency response. This effect can be reduced by suitable filters, shunting all or part of the electrical termination. A means, involving a special “broadband” termination, can extend the range of suppression without sacrificing Q at any frequency in the range. A composite device utilizes both a dynamic absorber (even the frequency-following kind) and a negative feedback velocity control. A brief comparison will be made among the several types indicated, as well as with standard active vibration controls.
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