213 圧電性高分子フィルムによる遮音・吸音

概要

論文の詳細を見る
Sound reflection and absorption by piezoelectric polymer films connected with negative capacitance circuits were studied. Normal acoustic transmission loss and normal acoustic absorption coefficient of PVDF films were determined by the acoustic tube measurements. When the circuit H, which hardens the films, was connected to the film, transmission loss was increased and absorption coefficient was slightly decreased. When the circuit S, which softens the films, was connected to the film, transmission loss was decreased and absorption coefficient was slightly decreased. Transmission loss of the film connected with an improved circuit H, in which a PVDF condenser was installed, increased 5dB in the frequency range of 200Hz to 1.3kHz. A prototype of sound reflection unit, which combines the second PVDF film, was made. Transmission loss of the unit increased 20∿35dB over a frequency range from 200Hz to 1.6kHz.
社団法人日本機械学会の論文
2003-06-04