Spatial Distribution of Acoustic Radiation Force for Non-Contact Modal Excitation

Spatial Distribution of Acoustic Radiation Force for Non-Contact Modal Excitation
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非接触模态激励声辐射力的空间分布

DOI:
10.1007/978-3-319-30249-2_12
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发表时间:
2016
期刊:
Volume 10
影响因子:
--
通讯作者:
Raisbeck, Cole
Raisbeck, Cole
中科院分区:
--
文献类型:
--
作者:
Huber, Thomas A;Algren, Mikaela;Raisbeck, Cole

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在模态测试中,常见的激励方法是换能器与被测物体机械接触。然而,对于某些结构,期望在没有物理接触的情况下激发振动。一种有前途的激励技术是声辐射力。然而,在使用这种技术的挑战是,声辐射力是分散在一个有限直径的焦点区域。我们描述了一种直接测量这种力的空间分布的方法。超声换能器发射频率为例如f1 = 600.610 kHz和f2 = 600 kHz的正弦波;所产生的辐射力具有频率差f1-f2= 610 Hz的分量。将MicroAcoustic Instruments BAT 6超声换能器聚焦到具有610 Hz基频的19.6 × 8.1 × 0.37 mm无夹持黄铜悬臂上的约2 mm直径的点。当焦点穿过悬臂的边缘时,振动计测量响应。这使得能够确定由换能器传递的声辐射力的分布。这可能有助于未来的研究,涉及建模的力施加到一个结构使用声辐射力。
In modal testing, a common excitation method is a transducer in mechanical contact with the object under test. However, for some structures it is desirable to excite vibrations without physical contact. One promising excitation technique is the acoustic radiation force. However, a challenge in using this technique is that the acoustic radiation force is spread out over a finite-diameter focal region. We describe a method to directly measure the spatial distribution of this force. An ultrasound transducer emitted sine waves with frequencies of, for examplef1= 600.610 kHz andf2= 600 kHz; the resulting radiation force had a component at the difference frequencyf1-f2= 610 Hz. A MicroAcoustic Instruments BAT6 ultrasound transducer was focused to an approximately 2 mm diameter spot on a 19.6 by 8.1 by 0.37 mm clamped-free brass cantilever with a 610 Hz fundamental frequency. A vibrometer measured the response as this focus spot traversed the edge of the cantilever. This enabled determination of the distribution of the acoustic radiation force being delivered by the transducer. This may be helpful in future studies that involve modeling the force applied to a structure using the acoustic radiation force.
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