Estimation of uncertainty in the structure-borne sound power transmission from a source to a receiver
Estimation of uncertainty in the structure-borne sound power transmission from a source to a receiver
复制标题
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
T. Evans
中科院分区：
文献类型：
--
作者：
T. Evans
结构动态的不确定性越来越受到许多行业的关注。以前已经有相当多的注意力用于频率响应函数的研究，然而与结构声源激励结构相关的不确定性却很少受到关注。在这项工作中，在结构承载的声功率从一个振动源传输到接收结构的不确定性被考虑。本文提出了一种方法，将结构声源及其接收器结构的有源和动态特性的不确定性传播到注入功率中。考虑的情况下，描述源和接收器的数据是不完整的，因此被称为“颗粒”。的平均值和不确定性的颗粒变量的估计方法的开发，它表明，通过估计的平均值和不确定性的缺失元素的不确定性传播方法可以用于一个“颗粒”的情况下。这种方法是用一个例子来说明，其中的自由速度相位数据被假定为不可用。理想化的结构传播的声源分析创建，以检查所提出的方法的有效性。良好的相关性之间的估计的不确定性，在传输功率和通过蒙特卡洛分析获得的不确定性。深入了解的频率区域，可以预期在传输的结构声功率的大的不确定性。有人认为，通过提供估计的不确定性预测的传输功率，洞察估计的可靠性实现，允许工程决策，以更大的信心。
Uncertainty in structural dynamics is of growing concern to numerous industries. Significant attention has previously been devoted to the study of frequency response functions, however the uncertainty associated with excitation of structures by structureborne sound sources has received little attention. In this work, the uncertainty in the structure borne sound power transmitted from a vibration source into a receiving structure is considered. A method is presented whereby the uncertainties in the active and dynamic properties of a structure borne sound source and its receiver structure are propagated through to the injected power. Consideration is given to the case where the data describing the source and receiver is incomplete and is therefore termed 'granular'. An approach for the estimation of the mean and uncertainty of granular variables is developed and it is shown that by estimating the mean and uncertainty of the missing elements the uncertainty propagation approach can be used for a 'granular' case. This approach is illustrated using an example in which the free velocity phase data is assumed to be unavailable. Idealised structure borne sound sources are created analytically in order to examine the validity of the presented methods. Good correlation is observed between the estimated uncertainties in the transmitted power and the uncertainties obtained through a Monte Carlo analysis. Insight into the frequency regions where large uncertainties can be expected in the transmitted structure borne sound power is obtained. It is argued that by providing estimates for the uncertainty of a prediction of the transmitted power, an insight into the reliability of the estimate is achieved, allowing engineering decisions to be made with greater confidence.