Active Wave Control of a Flexible Beam : Fundamental Characteristics of an Active-Sink System and Its Verification

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This paper deals with the active wave control of a flexible beam. It is the purpose of this paper to realize experimentally the active sink proposed in the previous paper, and to discuss the fundamental characteristics of the active-sink system. First, for the purpose of observing wave flow traveling along the beam, a visualization system is developed. Next, on the basis of the visualization system, an experiment is carried out to verify the existence of the active sink. Then, from an analytical point of view, this paper further investigates the characteristics of the active-sink system, showing that an active source also exists in addition to the active sink. It is also found that there are two suppression patterns in active wave control; that is, the progressive-wave type and the standing-wave type. Finally, by introducing both phase distribution and gain of the complex reflection coefficient over a flexible beam, the generation mechanism of these patterns is clarified.
一般社団法人日本機械学会の論文
1992-06-15