Abstract
Noise reduction is becoming more important in design process of automobile, aircraft, electric appliance and others from the viewpoints of environment problem and improvement of product value. Embossing processing is proposed as a noise reduction technique for panel structures and the authors studied about optimization of placement and dimension of embossing. Embossing is a good technique to improve stiffness of panel structures and reduce sound power level. However, it is not effective in reducing peak levels of sound pressure level at resonance frequencies because of little enhancement of damping. In this paper, the combination of embossing and PZT shunt circuit is proposed as a more effective technique to reduce noise radiated from panel structures.
