抄録
This paper focused on a vortex typed structural intensity on plate. When the structural intensity distribution on the plate is kind to be in vortex, the vibration and the radiation sound levels are getting smaller and the radiation efficiency is drastically changed to be larger and smaller than the case of the non-vortex types structural intensity pattern. In this paper, it is firstly shown that the vortex typed intensity distribution is aroused by the excitation at near the nodal line. Then the modal expansion of structural intensity can prove the occurrence of the vortex intensity. Finally the relation between the structural intensity with vortex distribution and the low noise and vibration conditions is discussed.
