Some relationships for coupled structures and their application to measurement of structural dynamic properties in situ
Some relationships for coupled structures and their application to measurement of structural dynamic properties in situ
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DOI：
10.1016/j.ymssp.2010.12.016
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发表时间：
2011-07
影响因子：
8.4
通讯作者：
A. Moorhouse;T. Evans;A. Elliott
中科院分区：
文献类型：
--
作者：
A. Moorhouse;T. Evans;A. Elliott
提出了间接确定子结构结构动力特性的三种关系，即堵塞力、流动性和自由速度。首先，表明振动源的阻塞力可以从原位测量中获得，即当震源连接到接收器结构时。这可能会消除对采用阻塞终端的特殊测试平台的需求。这种关系的一个推论是，理论上精确的传递路径分析可以对一个完全组装的结构，如车辆。其次，推导了子结构迁移率的间接测量关系。在这种情况下，有必要分离子结构，但优点是仅在子结构上用户定义的点上需要激励；接触点不需要激励，因此可以避免通常遇到的测量困难。最后表明，振动源的自由速度可以通过在安装条件下的测量间接得到；因此，避免了许多重要的振动源在实践中不可能实现的自由悬架的需要。用杆和梁的半解析模拟验证了这种关系，并简要讨论了误差。
Three relationships are presented for indirect determination of the structural dynamic properties of substructures, namely the blocked force, mobility and free velocity. First, it is shown that the blocked force of a vibration source can be obtained from measurements made in situ, i.e. when the source is connected to a receiver structure. This potentially removes the need for special test rigs employing blocked terminations. A corollary of this relationship is that a theoretically exact transfer path analysis can be made on a fully assembled structure, such as a vehicle. Next, a relationship for indirect measurement of substructure mobility is derived. In this case, it is necessary to separate the substructures, but the advantage is that excitation is only required at user defined points on the substructures; excitation at the contact points is not required, so commonly encountered measurement difficulties can be avoided. Finally, it is shown that the free velocity of a vibration source can be obtained indirectly from measurements made in the installed condition; the need for a free suspension, which is impossible in practise for many important vibration sources, is thus avoided. The relationships are validated using semi-analytical simulations of rods and beams, and errors are briefly discussed.