薄肉平板のパワーフロー制御に関する研究

抄録

This paper deals with the active control of power flow of a vibrating plate. It is the purpose of this paper to present a wave control method of a distributed parameter system such as a beam or a plate. This paper also aims to show the results of visualizing wave propagation. Unlike a conventional modal based control method, this method has the potential of suppressing all the vibration modes of a structure. First, from an analytical point of view, this paper presents three kinds of flow patterns in controlled vibration intensity; that is, (1) straight flow patterns from exciting point to control point, (2) S-shaped flow patterns, and (3) rotational flow patterns around the exciting point and control point. Then, the existence of these patterns is verified experimentally. Next, relationships between vibrational and acoustical intensity are discussed, and also the acoustic power and acoustic pressure in terms of these patterns are clarified. Furthermore, the characteristics of the rotational patterns are clarified, and a mean to generate the vortex of vibration intensity at an arbitrary position of a plate is presented.