Sound Transmission Analysis by Holography on Plates

通过平板全息技术进行声音传输分析

• 批准号: 60460176
• 负责人: OTSURU Toru
• 金额: $ 3.46万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60460176/
• 关键词: Sound transmission; From of plates; Edge condition; Holography; Computational mechanics; Boundary restrain parameter; Flat plate; 音響インテンシティ; ホログラフィ; 音響透過損失; 放射音響エネルギーの推定; 有限要素法による数値解析; 板の支持状態; 板振動

The problem treated in this study is that of the sound transmission characteristics through plates with various kinds of form such as the boundary conditions and the shape of a plate. The method used in this study is the observation of plates' vibrating modes by holography, and the computational analysis on plates' aound transmission properties by finite element method. From the holographic observation, the following are concluded that the elastically supported edges, considered to be the condition between simply supproted edges and clamped edges, can be quantified by the boundary restrain parameter. Additionally, a holographic method is developed to estimate the radiated acoustic power from the plates' vibrating modes; this estimation is useful in the discussion on the resonant sound transmission characteristics of plates; the approximation of the estimating method is examined in comparison with the acoustic intensity measurement. Here, these observations are performed on plates, alum … More inum and steel, rectangular flat shape and cylindrical curved shape., with elastically supproted edges and fixed edges. Generally speaking, even if the form of a plate is too complicated to be analysed by other existing measurements using vibration sensors, it can be analysed by holography in detail without affecting the plate's own vibration. Some new analysing method is needed to support the conclusions derived from the holographic observations theoretically. A computational analysing method on sound transmission characteristics of plates is developed to meet with the problem. It is based on finite element method, and it can treat the problem on various kinds of plates. With these observations and computational analysis, the characteristics of cylindrical curved plates are investigated to have superior sound insulating properties to those of flat plates under the ring frequence; this characteristics of cylindrical curved plates are found to be caused by the characteristics of the modes' radiation efficiency. Less

本文所研究的问题是各种形式的板的声传播特性，如边界条件、板的形状等。本研究采用全息照相法观察板的振动模式，用有限元方法对板的声传输特性进行计算分析。从全息观察可以看出，弹性支承边可以用边界约束参数来量化，弹性支承边被认为是简支边和固定边之间的条件。此外，还发展了一种从板的振动模式估计辐射声功率的全息方法；这种估计在讨论板的共振声传输特性时是有用的；通过与声强测量的比较，检验了估计方法的近似性。在这里，这些观察是在培养皿上进行的，明矾…更多的是iNum和钢材，矩形扁平形状和圆柱形弯曲形状，有弹性支承的边缘和固定的边缘。一般来说，即使板的形状太复杂，无法通过其他现有的使用振动传感器的测量来分析，它也可以通过全息术进行详细分析，而不会影响板本身的振动。需要一些新的分析方法来从理论上支持从全息观测得出的结论。针对这一问题，提出了一种板声传播特性的计算分析方法。它是以有限元方法为基础的，可以处理各种板的问题。在这些观测和计算分析的基础上，研究了圆柱形曲板在环形频率下的隔声性能优于平板的特性，发现圆柱形曲板的这种特性是由模式的辐射效率特性引起的。较少

项目成果

Toru Otsuru, Hideki Yamamoto, Hajime Yanagita: "Soung Transmission Analysis by Computational Mechanics on Cylindrical Curved Plates" Inter-Noise 88 Proceedings. (1988)

Toru Otsuru、Hideki Yamamoto、Hajime Yanagita：“通过计算力学对圆柱形弯曲板上的声音传输进行分析”Inter-Noise 88 论文集。

大鶴徹: 日本建築学会大会学術講演梗概集. 69-70 (1986)

Toru Ohtsuru：日本建筑学会会议学术讲座摘要 69-70 (1986)。

大鶴徹: 日本建築学会中国・九州支部研究報告. 7. 5-8 (1987)

大鹤彻：日本建筑学会中国/九州分院研究报告。7. 5-8 (1987)。

Toru Otsuru, Hideki Yamamoto: "Sound Transmission Analysis Using Computational Mechanics" The Journal of the Acoustic Society of Japan. 44-4. 11-17 (1988)

Toru Otsuru、Hideki Yamamoto：“使用计算力学的声音传输分析”日本声学学会杂志。

樋口正美: 日本建築学会大会学術講演梗概集. 65-66 (1986)

樋口雅美：日本建筑学会会议记录 65-66 (1986)。