Abstract
The purpose of this paper is to reduce a impulse noise of floor structure by using the active noise isolation unit which constructed from the thin board and the piezoelectric vibrator. In the experiment, an additional weight is connected to the piezoelectric vibrator in order to improve the isolation loss of low frequency range, and examined its mass and number. The experimental results show that the isolation loss of low frequency range was increased as the additional weight became heavy, and the isolation characteristics were obtained by both control effects and those effects. Furthermore, depending on the selection of appropriate mass, the additional weight was also effective to reduce the floor impulse noise.
