Abstract
The purpose of this study is to reduce a transmission noise of floor structure by the active noise isolation unit which constructed from thin board and piezoelectric vibrator. 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 120Hz to 500Hz is obtained about 30 to 60 dB by using thin and lightweight board. In addition, by using the insulator material pasted to the control board, the isolation loss could be increased.
