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.

目前没有表征氛围声源的实用方法，这些方法通过支撑和其他接触来激发支撑和周围结构的振动。该提案的上下文涉及由于机器振动传输到接收结构而引起的噪声的预测和控制，随后从结构中传播并重新辐射为噪声。实际上，是指实验室方法以降低形式产生源数据，可以将其转换为安装条件下结构传播功率的预测。尽管一般而言，空中源已通过参考机载声音成功地纳入了预测模型中，但尚未有可能以类似的基础结合结构传播来源。寻求结构传播源表征有两个主要挑战。首先，源表征需要考虑振动活性和与支撑和周围结构的接触处的结构动力学。其次，振动传输过程是复杂的，完整的描述需要大量数据集，并且在实验和计算上是密集的。但是，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，这将产生源强度的单一值，并且常规的观点是，这些实际要求与物理和准确的源表征的要求相冲突。这项调查的核心是通过开发和评估一种新型的接收板方法来解决这场冲突的结构传播方法。正在测试的机器附着在高弹性板上，该机器以自由源速度的形式间接获得源活动（即，好像机器已自由悬挂）。然后，将机器连接到低弹性板上，以间接获得阻塞的力（即，好像机器已连接到惰性结构上）。从这两个数量中，可以在没有直接测量的情况下获得源迁移率。该方法的基本优势是，直接获取每个接触的源活动和动态的耗时且复杂的过程，对于激发的每个组成部分，仅需要一种仅需要一种仅需要测量简单附着plates的响应速度的间接方法。