Detection of object resonances by vibro-acoustography and numerical vibrational mode identification.
Detection of object resonances by vibro-acoustography and numerical vibrational mode identification.
复制标题
通过振动声学和数值振动模式识别检测物体共振。
DOI：
10.1121/1.1616921
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
J. Chapelon
中科院分区：
文献类型：
--
作者：
F. Mitri;P. Trompette;J. Chapelon
白垩球和圆柱体的共振频率有关的压缩和弯曲模式检测在水中，使用振动声成像，一个相对较新的成像技术。低频激励的可变（辐射）力，由两个频率略有不同的主要聚焦超声波交叉产生，迫使物体振动。由物体振动引起的低频声发射场由水听器检测。通过将物体固定在超声波束的焦点处，并在选定的带宽内扫描其中一个初级波束的频率，可以通过声发射幅度的变化来检测一些共振频率（与压缩和弯曲模式相关的共振频率）。实验结果与有限元计算结果吻合良好。该方法可用于表征材料科学或生物学领域中各种介质中存在的非均匀性。
Chalk sphere and cylinder resonance frequencies related to compressional and bending modes were detected in water, using vibro-acoustography, a relatively new imaging technique. The variable (radiation) force of low-frequency excitation, produced by intersecting two primary focused ultrasound waves with slightly different frequencies, forces the object to vibrate. The low-frequency acoustic emission field, resulting from object vibration, was detected by a hydrophone. By fixing the object at the focus of the ultrasound beam and sweeping the frequency of one of the primary beams within a chosen bandwidth, it was possible to detect some of the resonance frequencies (those related to compressional and bending modes) via variations in acoustic emission amplitude. Experimental results showed excellent agreement with finite element calculations. This method can be used to characterize the presence of heterogeneities in various media, in the field of materials science or biology.
影响因子：
2.4
作者：
Chen, SG;Fatemi, M;Greenleaf, JF
通讯作者：
Greenleaf, JF