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Reception Plate Method for Structure-Borne Sound Sources

结构声源接收板法

基本信息

批准号：
EP/H040293/1
负责人：
Barry Gibbs
金额：
$ 21.97万
依托单位：
University of Liverpool
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2010
资助国家：
英国
起止时间：
2010 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FH040293%2F1
关键词：
Reception Plate Method Structure Borne

项目摘要

There are not presently available practical methods of characterising vibro-acoustic sources, which excite supporting and surrounding structures into vibration through the supports and other contacts. The context of the proposal concerns the prediction and control of noise due to machine vibrations being transmitted to a receiving structure, subsequently propagating and re-radiating from the structure as noise. By practical, is meant laboratory methods which yield source data in reduced form, which can be transformed into a prediction of the structure-borne power in the installed condition. Whilst generally, airborne sources have been successfully incorporated into prediction models by reference to airborne sound power, it has not yet been possible to incorporate structure-borne sources on a similar basis. There are two main challenges in seeking a structure-borne source characterisation. First, a source characterisation requires consideration of both the vibration activity and the structural dynamics at the contacts with supporting and surrounding structures. Secondly, the vibration transmission process is complicated and a full description requires a large data set and is experimentally and computationally intensive. However, design engineers, test-house managers and consultants require laboratory-based measurement systems which will yield single values of source strength and the conventional view is that these practical requirements conflict with the requirements for a physical and accurate source characterisation. The core of this investigation is to address this conflict by developing and appraising a novel reception plate method of structure-borne sound source characterisation. The machine under test is attached to a high-mobility plate, from which the source activity is obtained indirectly in the form of the velocity of the free source (i.e. as if the machine had been freely suspended). The machine then is attached to a low-mobility plate to indirectly obtain the blocked force (i.e. as if the machine had been attached to an inert structure). From these two quantities, the source mobility is obtained without direct measurement.The fundamental advantage of this method is that the time consuming and complicated process of directly acquiring the source activity and dynamics for each contact, and for each component of excitation, is replaced with an indirect method which only requires measurement of the response velocity of simple attached plates.

目前还没有可用的实用方法来表征振动声源，振动声源通过支撑和其他接触激发支撑和周围结构振动。该提案的背景涉及预测和控制由于机器振动被传输到接收结构，随后作为噪声从结构传播和重新辐射而产生的噪声。实用是指产生简化形式的源数据的实验室方法，这些数据可以转化为安装条件下结构承载功率的预测。虽然一般来说，空气声源已经通过参考空气声功率成功地纳入预测模型，但尚不可能在类似的基础上纳入结构声源。寻求结构源表征存在两个主要挑战。首先，源表征需要考虑与支撑和周围结构接触处的振动活动和结构动力学。其次，振动传递过程复杂，完整的描述需要大量的数据集，并且实验和计算量大。然而，设计工程师、测试室经理和顾问需要基于实验室的测量系统，该系统将产生源强度的单一值，而传统观点认为这些实际要求与物理和准确的源表征的要求相冲突。这项研究的核心是通过开发和评估一种新颖的结构声源表征接收板方法来解决这一冲突。被测机器连接到高移动性板上，从该板上以自由源速度的形式间接获得源活动（即，就好像机器已自由悬挂一样）。然后将机器连接到低移动性板上以间接获得阻挡力（即，就好像机器已连接到惰性结构）。从这两个量，无需直接测量即可获得源迁移率。该方法的根本优点是直接获取每个接触和每个激励分量的源活动和动态的耗时且复杂的过程被仅需要测量简单附着板的响应速度的间接方法所取代。