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http://hdl.handle.net/10397/74989
Title: | Investigations on flexural wave propagation and attenuation in a modified one-dimensional acoustic black hole using a laser excitation technique | Authors: | Ji, H Luo, J Qiu, J Cheng, L |
Issue Date: | 1-May-2018 | Source: | Mechanical systems and signal processing, 1 May 2018, v. 104, p. 19-35 | Abstract: | Acoustic Black Holes (ABHs), as a new type of passive structure for vibration damping enhancement and noise attenuation, have been drawing increasing attentions of many researchers. Due to the difficulty in manufacturing the sharp edges required by the ABH structures, it is important to understand the wave propagation and attenuation process in the presence of damping layers in non-ideal ABHs with a truncated edge. In this paper, an analytical expression of the wave reflection coefficient in a modified one-dimensional ABH is derived and a time-domain experimental method based on a laser excitation technique is used to visualize the wave propagation. In the experimental studies, the flexural waves in the ABH were excited by a scanning pulse laser and measured by a Laser Doppler Vibrometer (LDV). The incident wave and reflected wave were separated from the measured original wave field and the decrease of the wave velocity in the ABH was exhibited. The reflection coefficient was calculated from the ratio of the amplitude of the reflected wave to that of the incident wave for different ABH parameters and different thicknesses of the damping layer. The measured reflection coefficients were used to identify the unknown coefficients in the theoretical formula. The results confirm that there exists an optimal thickness for the damping layer, which leads to the minimum wave reflection. Based on the laser-induced visualization technique and various signal processing and feature extraction methods, the entire process of the wave propagation in a non-ideal one-dimensional ABH structure can be visualized and scrutinized. | Keywords: | Acoustic black holes Damping layer Energy trapping Laser excitation technique Reflection coefficient |
Publisher: | Academic Press | Journal: | Mechanical systems and signal processing | ISSN: | 0888-3270 | EISSN: | 1096-1216 | DOI: | 10.1016/j.ymssp.2017.10.036 | Rights: | © 2017 Elsevier Ltd. All rights reserved. © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Ji, H., Luo, J., Qiu, J., & Cheng, L. (2018). Investigations on flexural wave propagation and attenuation in a modified one-dimensional acoustic black hole using a laser excitation technique. Mechanical systems and signal processing, 104, 19-35 is available at https://doi.org/10.1016/j.ymssp.2017.10.036. |
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Cheng_Investigations_Flexural_Wave.pdf | Pre-Published version | 2.28 MB | Adobe PDF | View/Open |
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