能動騒音・振動制御による音響放射パワーの最小化 : 零制御パワーについて

This paper considers an acoustic power minimization problem from the viewpoint of active noise and vibration control. It is the purpose of this paper to elucidate a common link between : actively attenuating noise in a variety of acoustic environments, using vibration or acoustic control sources. It is shown that if acoustic reciprocity holds between each point on the primary source and each point on the control source, then the acoustic power output of the control source under optimal conditions will always be zero, with the converse also being true. This concept is demonstrated for systems operating in free space, using both acoustic and vibration control sources. The physical meaning of this concept for the employment of vibration control sources, applied directly to a vibrating structure in an effort to attenuate the radiated sound field, is shown.