薄肉平板における渦巻形パワーフローの生成メカニズム

概要

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This paper considers the active control of a vibrating thin plate from the viewpoint of a power flow control methodology. It is the purpose of this paper to elucidate the generation mechanism of power flow patterns induced in an actively controlled thin plate. Particular emphasis is placed upon the vortex-type response pattern, which has the potential for realizing energy confinement into a specific area of the plate. Firstly, it is shown that two vibration modes dominate the plate response in the case of vortex-type power flow near the optimum condition for suppressing the plate vibration. Vibration intensity is derived for these two vibration modes. An energy stream function for the vibration intensity field is then introduced, to whose contour the vibration intensity vector proves to be tangential. From the characterintics of the stream function, the number and direction of the vortices are predicted. Finally, it is shown that the period of the vortex is not always the same as the exciting period, but rather equal to some integer times the exciting period.
一般社団法人日本機械学会の論文
1993-05-25