A theoretical comparison between fully active and semi-active vibration control applied to a simple vibrating system is presented. With the advent of modern transducers and signal processing equipment, control of vibration by active rather than passive means is a practical possibility. There are many ways of implementing such control systems, and this paper discusses and compares a fully active and a semi-active system used to reduce the transmissibility of a single-degree-of-freedom system. The paper concentrates on the physical limitations of such active vibration control systems and highlights and discusses the important physical parameters.
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