N. Tanaka et al., POWER-FLOW CONTROL OF A THIN-PLATE, JSME international journal. Series C, dynamics, control, robotics, design and manufacturing, 37(3), 1994, pp. 588-594
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 metho
d for suppressing vibration of a distributed parameter system such as
a beam or a plate. Unlike a conventional modal-based control method, t
his method has the potential to suppress all vibration modes of a stru
cture. First, from an analytical point of view, this paper presents th
ree kinds of flow patterns appearing in controlled vibration intensity
: (1) straight flow patterns from the excitation point to control poin
t, (2) S-shaped flow patterns and (3) vortex flow patterns around the
excitation point and control point. Then, the existence of these patte
rns is verified experimentally. Next, relationships between vibrationa
l and acoustical intensities are discussed, and the acoustic power and
acoustic pressure in terms of these patterns are also investigated. F
urthermore, the characteristics of the rotational patterns are clarifi
ed and a means to generate the vortex of vibration intensity at an arb
itrary position on a plate is presented.