Sound Transmission Analysis by Holography on Plates

通过平板全息技术进行声音传输分析

基本信息

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

项目摘要

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

这项研究中处理的问题是通过具有各种形式的板（例如边界条件和板的形状）的板传递特性的问题。本研究中使用的方法是通过全息图观察板的振动模式，以及通过有限元方法对板的AOUND传输属性进行的计算分析。从全息观察中，可以得出结论，可以通过边界限制参数来量化弹性支撑的边缘，被认为是简单的刺激边缘和夹紧边缘之间的条件。此外，开发了一种全息方法来估计板的振动模式的放射力。该估计在讨论板的共振传输特性时很有用。与声强度测量相比，检查了估计方法的近似值。在这里，这些观察结果是在板上进行的，校友……更多的INUM和钢，矩形扁平形状和圆柱形弯曲形状。一般而言，即使板的形式过于复杂，无法使用振动传感器对其他现有测量进行分析，也可以通过全息图对其进行详细分析，而不会影响板自身的振动。需要一些新的分析方法来支持从全息观察理论上得出的结论。开发了有关板的声音传输特性的计算分析方法，以解决问题。它基于有限元方法，可以在各种板上处理问题。通过这些观察结果和计算分析，研究了圆柱弯曲板的特征，其具有优越的声音绝缘性能，其特性与环频率下的平板的特性具有出色的特性。发现圆柱弯曲板的这种特征是由模式辐射效率的特征引起的。较少的