Investigations on flexural wave propagation and attenuation in a modified one-dimensional acoustic black hole using a laser excitation technique

被引:84
作者
Ji, Hongli [1 ,2 ]
Luo, Jing [1 ]
Qiu, Jinhao [1 ]
Cheng, Li [2 ]
机构
[1] Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Nanjing, Jiangsu, Peoples R China
[2] Hong Kong Polytech Univ, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China
基金
中国国家自然科学基金;
关键词
Acoustic black holes; Energy trapping; Reflection coefficient; Laser excitation technique; Damping layer; PLATES; VIBRATIONS;
D O I
10.1016/j.ymssp.2017.10.036
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
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. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码:19 / 35
页数:17
相关论文
共 37 条
[1]   Experimental study of sound radiation by plates containing circular indentations of power-law profile [J].
Bowyer, E. P. ;
Krylov, V. V. .
APPLIED ACOUSTICS, 2015, 88 :30-37
[2]   Experimental investigation of damping flexural vibrations in glass fibre composite plates containing one- and two-dimensional acoustic black holes [J].
Bowyer, E. P. ;
Krylov, V. V. .
COMPOSITE STRUCTURES, 2014, 107 :406-415
[3]   Effect of geometrical and material imperfections on damping flexural vibrations in plates with attached wedges of power law profile [J].
Bowyer, E. P. ;
O'Boy, D. J. ;
Krylov, V. V. ;
Horner, J. L. .
APPLIED ACOUSTICS, 2012, 73 (05) :514-523
[4]   Laser ultrasonic anomalous wave propagation imaging method with adjacent wave subtraction: Application to actual damages in composite wing [J].
Chia, Chen Ciang ;
Lee, Jung-Ryul ;
Park, Chan-Yik ;
Jeong, Hyo-Mi .
OPTICS AND LASER TECHNOLOGY, 2012, 44 (02) :428-440
[5]   Numerical analysis of the vibroacoustic properties of plates with embedded grids of acoustic black holes [J].
Conlon, Stephen C. ;
Fahnline, John B. ;
Semperlotti, Fabio .
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 2015, 137 (01) :447-457
[6]   Measurement and modelling of the reflection coefficient of an Acoustic Black Hole termination [J].
Denis, V. ;
Gautier, F. ;
Pelat, A. ;
Poittevin, J. .
JOURNAL OF SOUND AND VIBRATION, 2015, 349 :67-79
[7]   Guided waves in a plate with linearly varying thickness:: experimental and numerical results [J].
El-Kettani, MEC ;
Luppé, F ;
Guillet, A .
ULTRASONICS, 2004, 42 (1-9) :807-812
[8]   An Experimental Investigation of Acoustic Black Hole Dynamics at Low, Mid, and High Frequencies [J].
Feurtado, Philip A. ;
Conlon, Stephen C. .
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME, 2016, 138 (06)
[9]   Damping of structural vibrations in beams and elliptical plates using the acoustic black hole effect [J].
Georgiev, V. B. ;
Cuenca, J. ;
Gautier, F. ;
Simon, L. ;
Krylov, V. V. .
JOURNAL OF SOUND AND VIBRATION, 2011, 330 (11) :2497-2508
[10]   Wave Energy Focalization in a Plate With Imperfect Two-Dimensional Acoustic Black Hole Indentation [J].
Huang, Wei ;
Ji, Hongli ;
Qiu, Jinhao ;
Cheng, Li .
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME, 2016, 138 (06)