Abstract
The purpose of this study is to reduce a transmission noise of floor structureby the active noise isolation unit which constructed from thin board and piezoelectric viblator. The piezoelectric vibrator is attached to the thin board by the center connection bolt. Through the experiments, the effects of material of isolation control board on isolation characteristics were investigated. The experimental results show that isolation loss at input frequency from 200Hz to 700Hz is obtained about 50dB by using thin and lightweight boaed. In addition, by using the insulator material pasted to the control board, the isolation loss could be increased.
