巻号一覧
41 巻, 7 号
選択された号の論文の11件中1～11を表示しています
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塩田 正純, 松井 昌幸原稿種別: 本文
1985 年 41 巻 7 号 p. 431-441
発行日: 1985/07/01
公開日: 2017/06/02
ジャーナル フリーThis paper makes a proposal of prediction formula showing distance reduction in vibration propagation that imported a new thinking of "vibration source power level" on the vibration propagation along the ground surface causing by the industrical machines that is established a forging factory, a metal press factory, a foundary, and so on. Next, it was evident that the theory of "noise source power level "used in the field of noise control engineering could apply to this prediction process, and an appropriateness as the prediction formula at distance reduction could confirm from an examination result of double-sides of the theory and the field measurement. It showed these conclusions as follows. (1)Getting vibration velocity at vibration source, vibration power at vibration source can calculate from it. (2)Wave impedance in the ground is a foctor to determine the reference of vibration power. In case of using wave impedance in the ground (the first kind of groud soil-rock)showing this paper, the reference of vibration power W_0(W_0=1. 2*10^<-7> watt)is determined by the above. Consequently, vibration source power level L_<vw>(L_<vw>=10log_<10>W/W_0 dB)can be calculated, the prediction concerned with vibration propagation with L_<vw>(dB)might be possible. (3)There are correlation between vibration source power level in theory. Similarly, there are correlation between vibration source assumed power level and vibration source assumed power level and vibration source power level in prediction as well. Therefore, it is a good reason in the thinking of "vibration source power level. "(4)The most suitable prediction formula(L_<vr>=L_<vw>-15log_<10>γ-8. 68α・γ-k_γdB. Here, L_<vr>:vertical vibration level, γ:the distance from receive vibration point to vibration source, α:soil nature damping constant, k_γ:the coefficient depending to distance) could find from an examination result in the field measurement, and it becomes the prediction formula in the field measurement, and it becomes the prediction formula in hte field measurement. (5)The field measurement values are more appreximate to values according to the prediction formula than according to theoretical formula抄録全体を表示PDF形式でダウンロード (1222K) -
石原 豊彦, 戸田 耕司原稿種別: 本文
1985 年 41 巻 7 号 p. 442-449
発行日: 1985/07/01
公開日: 2017/06/02
ジャーナル フリーA high-frequency sound field in a duct with a monotonically increasing velocity profile over an impedance boundary is investigated by four methods:1)boundary wave mode, continuous spectrum, and surface wave mode(surface trapped mode)representation, 2)geometrical acoustical ray, interference wave expressed in integral form, and surface wave mode representation, 3)geometrical acoustical ray, lower order boundary wave mode, and surface wave mode representation, and 4)near field perturbation representation. Numerical evaluations and physical interpretations of these alternative methods are performed for a specific example with a slowly increasing exponential velocity profile. As for planar impedance boundary problems, the total sound field is enhanced and an interference effect appears due to the existence of a surface trapped mode for a highly inductive impedance boundary. Most interesting from a physical view point is a field representation consisting of a few geometrical acoustical rays, lower order boundary wave modes, and a surface wave mode抄録全体を表示PDF形式でダウンロード (887K) -
吉田 拓正原稿種別: 本文
1985 年 41 巻 7 号 p. 450-458
発行日: 1985/07/01
公開日: 2017/06/02
ジャーナル フリーThis study concerns subjective ratings of speech-intelligibility with method of magnitude estimation. Rating tests were conducted for speech sound in level-fluctuating noises with four σ (standard deviation of noise level distribution)and steady noises of controls. Relations of subjective ratings(or PSE)among level-fluctuating noises and steady noise were investigated in relation to SNR(signal-to-noise ratio). Further, an equivalent level of level-fluctuating noises to steady noise was estimated for subjective ratings of speech-intelligibility by multiple regression analysis. As the results, subjective ratings in level-fluctuating noises correlated to SNR in higher than 0. 92 and the standard errors of subjective ratings(in PSE)were 1. 5-3. 4 dB around each regression line. Accuracy of these was equivalent to that in steady noise. Further, it was showed that L_<eq> had a tendancy to be overestimated as to subjective ratings of speech-intelligibility especially in the lower levels of L_<eq> at the larger σ of level-fluctating noises. As the equivalent level to steady noise, it was estimated that L_y=L_<eq>-SNR(0. 05σ-0. 003σ^2 for subjective ratings. It was showed that articulation index(estimated)would be available to estimate subjective ratings in stead of L_y. It was also showed that the equivalent level of L_s by Sone et al. for sound articulation would be useful to estimate subjective ratings instead of L_y. But some differences were observed between L_y and L_s and it was suggested that the definition of L_s should follow L_s=L_<eq>-0. 059σ^2 as far as distribution of noise levels would not follow normal distribution抄録全体を表示PDF形式でダウンロード (879K) -
厚井 弘志, 青井 一郎, 藤田 真一, 笈西 隆滋原稿種別: 本文
1985 年 41 巻 7 号 p. 459-464
発行日: 1985/07/01
公開日: 2017/06/02
ジャーナル フリーPDF形式でダウンロード (1059K) -
小橋 豊原稿種別: 本文
1985 年 41 巻 7 号 p. 465-470
発行日: 1985/07/01
公開日: 2017/06/02
ジャーナル フリーPDF形式でダウンロード (766K) -
浜田 晴夫, 榎木 隆司, 岡部 馨, 三浦 種敏原稿種別: 本文
1985 年 41 巻 7 号 p. 471-480
発行日: 1985/07/01
公開日: 2017/06/02
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山崎 芳男, 大越 幹, 伊藤 毅原稿種別: 本文
1985 年 41 巻 7 号 p. 481-489
発行日: 1985/07/01
公開日: 2017/06/02
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編集委員会原稿種別: 本文
1985 年 41 巻 7 号 p. 490-494
発行日: 1985/07/01
公開日: 2017/06/02
ジャーナル フリーPDF形式でダウンロード (641K) -
原稿種別: 付録等
1985 年 41 巻 7 号 p. 495-
発行日: 1985/07/01
公開日: 2017/06/02
ジャーナル フリーPDF形式でダウンロード (107K) -
原稿種別: 本文
1985 年 41 巻 7 号 p. 496-499
発行日: 1985/07/01
公開日: 2017/06/02
ジャーナル フリーPDF形式でダウンロード (570K) -
鈴木 昭次原稿種別: 本文
1985 年 41 巻 7 号 p. 500-506
発行日: 1985/07/01
公開日: 2017/06/02
ジャーナル フリーPDF形式でダウンロード (780K)
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