| Budget Amount *help |
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Research Abstract |
The sound absorbing effect of the plate that is obtained at around the natural frequency of the plate is well known; however, the effect is usually insufficient because of the lack of the damping ratio of the plate. Therefore, we proposed the sound absorbing panel using the piezoelectric element and LR circuit. Because the piezoelectric element and LR circuit give the damping effect to the plate, the proposed sound absorbing panel indicated the high sound absorption coefficient. In addition, the method that enhances the efficiency of the piezoelectric element was applied to the proposed method. The method that gives negative stiffness to the plate using the negative capacitance was also proposed in order to cancel the air spring effect of the air space behind the sound absorbing panel.
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