巻号一覧
18 巻 (1991)
- 4 号 p. 202-
- 3 号 p. 146-
- 2 号 p. 84-
- 1 号 p. 36-
18 巻, 3 号
選択された号の論文の2件中1～2を表示しています
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山口 静馬, 倉本 和興, 老松 建成, 桑原 信也1991 年 18 巻 3 号 p. 146-153
発行日: 1991/07/01
公開日: 2011/08/16
ジャーナル フリーFor the purpose of fundamental consideration of the underwater random sound field, an approximate expression for the probability distribution function of sound power fluctuation radiated from a moving ship (which is very important as the sound source) is first derived, by paying special attention to the standard shape of sound pressure spectrum level of radiated noise. Next, by using the above theoretical result, a simplified probability expression is proposed as a statistical method of practical use. Finally, the validity and usefulness of the theoretical result is experimentally confirmed by applying it to data obtained by simulation experiment.抄録全体を表示PDF形式でダウンロード (761K) -
長谷川 秋雄, 吉井 哲, 菊池 年晃1991 年 18 巻 3 号 p. 154-164
発行日: 1991/07/01
公開日: 2011/03/02
ジャーナル フリーConventional piezoelectric ceramics, such as lead zirconate titanate (PZT), are hard materials (high Q materials). This hardness exhibits noticeable resonances and causes a narrow bandwidth. A flexible piezoelectric rubber is very promising piezoelectric material for wide band applications because of its low Q property. The transmitting and receiving sensitivities are measured over the frequency ranges 20-150 and 100-1000 kHz. The results of these measurements are compared with those obtained PZT, anisotropic (Pb, Ca) TiO3 and P (VDF/TrFE). It is clarified that the piezoelectric rubber, (Pb, Ca) TiO3 and P (VDF/TrFE) are very useful for underwater hydrophone applications over wider frequency ranges. In addition, a tone-burst response is tested. A damped ringing in a tone-burst pulse is measured-for piezoelectric rubber and (Pb, Ca) TiO3 ceramics.抄録全体を表示PDF形式でダウンロード (1166K)
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