抄録
To reduce the noise radiated from the transformer, it is necessary to set up the sound insulating walls or for the transformer to be placed indoor, but these countermeasures are high-cost. Because the panels of transformer are very thick, it is difficult to control the vibration of the panels. As one measure of lightweight and low-cost, we propose a way to dissipate the noise energy transmitted through panels of transformer by installing noise control panels equipped with piezo-ceramic loudspeakers which consist of piezo-ceramic and thin iron plates. By fixing the noise control panels on the panel of transformer directly, the noise transmitted through the panel of transformer reduced by 7dB at 200Hz.
