204 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(一般 : 制振)

概要

論文の詳細を見る
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 polyvinylidene fluoride (PVDF) films is measured before and after coupling the negative capacitance circuit which makes the films harden, and similar experiments are carried out to examine vibration transmissibility of PZT ceramic plates with the circuit which makes the ceramics soften. Results indicate that each circuit has the ability to improve sound- and vibration-shielding efficiency of the film and the ceramic. The efficiency is noticeably improved by 15 dB for the film and by 30 dB for the ceramics approximately at frequencies where the equivalent electrical impedance of the circuit matches that of the materials. Magnitude of the improvement is controlled arbitrarily by adjusting the output voltage from the negative capacitance circuit.
社団法人日本機械学会の論文
2001-06-05