206 負性容量回路を結合した圧電材料の遮音および防振性能について(音のダンピング設計3)

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This paper investigates the sound-insulation and vibration-isolating efficiency of the piezoelectric films and ceramics connected with the electrical circuit to control their elasticity. Normal incident transmission loss of VDF/TrFE film is measured before and after coupling the negative capacitance circuit which makes the films harden. Results indicate that the circuit has the ability to improve sound-shielding efficiency of the film by 5 to 12 dB in the frequency range of about 2 octaves. Similar experiments are carried out to examine vibration transmissibility of PZT ceramic plates with the circuit which makes the ceramics soften. It is shown that the circuit makes the resonance peak of the vibration system downward, and that the efficiency is noticeably improved by more than 20 dB above the resonance frequency.
社団法人日本機械学会の論文
2002-01-11