Indirect determination of the mobility of structure-borne sound sources
Indirect determination of the mobility of structure-borne sound sources
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DOI：
10.1016/j.jsv.2015.01.011
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发表时间：
2015-05
影响因子：
4.7
通讯作者：
C. Höller;B. Gibbs
中科院分区：
文献类型：
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作者：
C. Höller;B. Gibbs
考虑了间接确定结构声源移动性的方法。源迁移率是从原位测量中获得的，而不是在自由状态下对源进行测量。如果源难以悬挂，或者包含非线性结构元素，则此方法很有用。从理论上推导了间接源迁移率的两种公式。第一个需要测量接触点处或接触点附近的速度。第二个仅涉及远程速度的测量。这两种方法都不需要在耦合状态下的接触处进行激励。耦合光束的数值模拟用于验证这两种方法，并研究它们相对于典型测量误差（例如背景噪声和传感器定位不准确）的准确性和可靠性。研究发现，这些会对所考虑的方法产生重大影响。进行了几个单接触和多接触源的实验案例研究。结果原则上证实了这两种方法的有效性，但强调了它们对实验误差的敏感性。在风扇装置的代表性案例研究中，平均误差范围在 ±5 dB 到 ±10 dB 之间，偶尔误差高达 30 dB。
Methods are considered for the indirect determination of the mobility of structure-borne sound sources. Instead of performing measurements on the source in the free state, the source mobility is obtained from measurements madein-situ. This approach is beneficial if the source is difficult to suspend, or if it contains nonlinear structural elements. Two formulations for an indirect source mobility are derived theoretically. The first requires measurement of velocities at or near to the contact points. The second involves measurement of remote velocities only. Neither of the methods requires excitation at the contacts in the coupled state. Numerical simulations of coupled beams are used to validate the two methods and investigate their accuracy and reliability with respect to typical measurement errors, such as background noise and inaccuracies in sensor positioning. It is found that these can have a significant effect on the methods considered. Several experimental case studies with single-contact and multi-contact sources are performed. The results confirm the validity of the two methods in principle, but highlight their sensitivity to experimental errors. In a representative case study with a fan unit, average errors range between ±5 dB and ±10 dB, with occasional errors of up to 30 dB.