基于频率-波数分析的激光Lamb波传播特性实验研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (22) : 70-78.

论文

刘增华1,2 冯雪健1,2 任捷1,2 王双全1,2 何存富1,2 吴斌1,2

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Experimental study on the propagation characteristics of laser-induced Lamb waves based on frequency-wavenumber analysis

LIU Zenghua1,2 FENG Xuejian1,2 REN Jie1,2 WANG Shuangquan1,2 HE Cunfu1,2 WU Bin1,2

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文章历史 +

摘要

Lamb波的频散和多模态特性，使得利用Lamb波信号的时域或频域特征实现缺陷的定量检测具有一定的困难。本文提出了一种在频率-波数内分析激光Lamb波传播特性的方法。基于全光学型激光超声检测系统，脉冲激光在固定位置激励，连续激光一维线扫描接收，获得时间-空间波场信号，可直观地显示激光Lamb波信号的传播特性以及激光Lamb波与缺陷之间的作用规律。采用二维傅里叶变换将波场信号从时间-空间域转换到频率-波数域，可有效识别信号中包含的各模态信息。为了保留空间信息，借鉴短时傅里叶变换的思想，采用短空间二维傅里叶变换得到沿扫描路径上波数的分布，从中可直观看出缺陷的位置。采用带通滤波结合连续小波变换的方法对短空间二维傅里叶变换的结果进行了优化。分别在有、无缺陷铝板中进行了实验研究，实验结果验证了该方法的有效性。

Abstract

It is difficult to realize the quantitative detection of defects by using the time domain or frequency domain features of Lamb wave signals due to their dispersion and multi-mode characteristics. This paper proposes a method for analyzing the propagation characteristics of laser-induced Lamb waves in frequency-wavenumber domain. Based on a full-optical laser ultrasonic testing system, time-space wavefield signals were obtained by the pulse laser excitation in a fixed location and continuous laser acquisition with one-dimensional scanning, where the propagation characteristics of laser-induced Lamb wave signals and the regular pattern of the interaction between the laser-induced Lamb wave signal and the defect can be visually displayed. The two-dimensional Fourier transform was used to convert the wavefield signals from the time-space domain to the frequency-wavenumber domain where individual modes including in the signals are well discernible. Based on the idea of short-time Fourier transform, for retaining the space information, a short-space two-dimensional Fourier transform was adopted to obtain the distribution of wavenumber along the scanning path, by which the location of the defect can be visually displayed. The results of short-space two-dimensional Fourier transform were optimized by using band-pass filtering combined with continuous wavelet transform. The experiments performed on pristine and defected aluminum plates respectively confirm the effectiveness of the method.

导出引用

刘增华1,2 冯雪健1,2 任捷1,2 王双全1,2 何存富1,2 吴斌1,2. 基于频率-波数分析的激光Lamb波传播特性实验研究[J]. 振动与冲击, 2019, 38(22): 70-78

LIU Zenghua1,2 FENG Xuejian1,2 REN Jie1,2 WANG Shuangquan1,2 HE Cunfu1,2 WU Bin1,2. Experimental study on the propagation characteristics of laser-induced Lamb waves based on frequency-wavenumber analysis[J]. Journal of Vibration and Shock, 2019, 38(22): 70-78

参考文献

[1] 张钰. 铝合金在航天航空中的应用[J]. 铝加工, 2009, (3)：50-53.
ZHANG Yu. Application of aluminum alloy to aerospace industry[J]. Aluminium Fabrication, 2009, (3)：50-53.
[2] 王文杰. 高性能先进舰船用合金材料的应用现状及展望[J]. 材料导报, 2013 27(4)：98-105.
WANG Wenjie. The appliation status and perspective of alloys for high performance and advanced naval vessels[J]. Materials Review, 2013, 27(4)：98-105.
[3] ROSE J L. A baseline and vision of ultrasonic guided wave inspection potential[J]. Journal of Pressure Vessel Technology, 2002, 124(3)：273-282.
[4] DALTON R P, CAWLEY P, LOWE M J S. The potential of guided waves for monitoring large areas of metallic aircraft fuselage structure[J]. Journal of Nondestructive Evaluation, 2001, 20(1)：29-46.
[5] BENMEDDOUR F, GRONDEL S, ASSAAD J, et al. Study of the fundamental Lamb modes interaction with symmetrical notchs[J]. NDT & E International, 2008, 41(1)：1-9.
[6] TAN K S, GUO N, WONG B S, et al. Comparison of Lamb waves and echo in detection of near-surface defects in laminate plates[J]. NDT & E International, 1995, 28(4)：215-223.
[7] 王强, 袁慎芳. 主动Lamb波结构健康检测中信号增强与损伤成像方法[J]. 航空学报, 2008, 29(4)：1061-1067.
WANG Qiang, YUAN Shenfang. Amplifying signal and imaging damage method for active Lamb wave structure health monitoring[J]. Acta Aeronautica ET Astronautica Sinica, 2008, 29(4)：1061-1067.
[8] OSTACHOWICZ W, KUDELA P, MALINOWSKI P, et al. Damage localisation in plate-like structures based on PZT sensors[J]. Mechanical Systems and Signal Processing, 2009, 23(6)：1805-1829.
[9] 刘增华, 徐营赞, 何存富, 等. 板状结构中基于Lamb波单模态的缺陷成像试验研究[J]. 工程力学, 2013, 31(4)：232-238.
LIU Zenghua, XU Yingzan, HE Cunfu, et al. Experimental study of defect imaging based on single lamb wave mode in plate-like structures[J]. Engineering Mechanics, 2013, 31(4)：232-238.
[10] 陈洪磊, 邓菲, 刘增华.基于Lamb波传播路径分析的复合材料板中缺陷成像[J]. 机械工程学报, 2016, 52(24)：232-238.
CHEN Honglei, DENG Fei, LIU Zenghua. Defect imaging in composite plates based on propagation paths analysis of Lamb waves[J]. Engineering Mechanics, 2016, 52(24)：232-238.
[11] 刘增华, 樊军伟, 何存富, 等. 基于概率损伤算法的复合材料板空气耦合Lamb波扫描成像[J]. 复合材料学报, 2015, 32(1)：227-235.
LIU Zenghua, FAN Junwei, HE Cunfu, et al. Scanning imaging of composite plate using air-coupled Lamb waves based on probabilistic damage algorithm[J]. Acta Materiae Compositae Sinica, 2015, 32(1)：227-235.
[12] LIU Zenghua, SUN Kunming, SONG Guorong, et al. Damage localization in aluminum plate with compact rectangular phased piezoelectric transducer array[J]. Mechanical Systems and Signal Processing, 2016, 70：625-636.
[13] YU Lingyu, LECKEY C A C. Lamb wave-based quantitative crack detection using a focusing array algorithm[J]. Journal of Intelligent Material Systems and Structures, 2013, 24(9)：1138-1152.
[14] YU Lingyu, GIURGIUTIU V. In situ 2-D piezoelectric wafer active sensors arrays for guided wave damage detection[J]. Ultrasonics, 2008, 48(2)：117-134.
[15] KHALILI P, CAWLEY P. Excitation of single mode Lamb waves at high frequency thickness products[J]. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2015, 63(2)：303-312.
[16] WILCOX P, LOWE M, CAWLEY P, et al.. Omnidirectional guided wave inspection of large metallic plate structures using an EMAT array[J]. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2005, 52(4)：653-665.
[17] LIU Zenghua, YU Hongtao , FAN Junwei, et al. Baseline-free delamination inspection in composite plates by synthesizing non-contact air-coupled Lamb wave scan method and virtual time reversal algorithm[J]. Smart Materials and Structures, 2015, 24(4)：1-15.
[18] MAJUMDER M, GANGOPADHYAY T K, CHAKRABORTY A K, et al. Fibre Bragg gratings in structural health monitoring-Present status and applications[J]. Sensors and Actuators A Physical, 2008, 147(1)：150-164.
[19] AN Y K, PARK B, SOHN H. Complete noncontact laser ultrasonic imaging for automated crack visualization in a plate[J]. Smart Materials and Structures, 2013, 22(22)：025022(10pp).
[20] STASZEWSKI W J, LEE B C, MALLET L, et al. Structural health monitoring using scanning laser vibrometry: I. Lamb wave sensing[J]. Smart Materials and Structures, 2004, 13(2)：251-260.
[21] SUN Guangkai, ZHOU Zhenggan, LI Guanghai, et al. Development of an optical fiber-guided robotic laser ultrasonic system for aeronautical composite structure testing[J]. Optik, 2016, 127(12)：5135-5140.
[22] CHIA C C, LEE J R, PARK C Y, et al. Laser ultrasonic anomalous wave propagation imaging method with adjacent wave subtraction: Application to actual damages in composite wing[J]. Optics and Laser Technology, 2012, 44(2)：428-440.
[23] TIAN Zhenhua, YU Lingyu, LECKEY C A C. Rapid guided wave delamination detection and quantification in composites using global-local sensing[J]. Smart Materials and Structures, 2016, 25(8)：1-11.
[24] MALLET L, LEE B C, STASZEWSKI W J. Structural health monitoring using scanning laser vibrometry: II. Lamb waves for damage detection [J]. Smart Materials and Structures, 2004, 13(2)：261-269.
[25] KÖHLER B, BLACKSHIRE J L. Laser vibrometric study of plate waves for structural health monitoring (SHM)[C]. AIP Conference Proceedings, 2006, 25：1672-1679.
[26] LEE J R, CHIA C C, PARK C Y, et al. Laser ultrasonic anomalous wave propagation imaging method with adjacent wave subtraction: algorithm[J]. Optics and Laser Technology, 2012, 44(5)：1507-1515.
[27] LEE J R, CHO C M, PARK C Y, et al. Spar disbond visualization in in-service composite UAV with ultrasonic propagation imager[J]. Aerospace Science and Technology, 2015, 45(10)：180-185.
[28] RUZZENE M. Frequency-wavenumber domain filtering for improved damage visualization[J]. Smart Materials and Structures, 2007, 16(6)：2116-2129.
[29] PARK B, An Y K, Sohn H. Visualization of hidden delamination and debonding in composites through noncontact laser ultrasonic scanning[J]. Composites Science and Technology, 2014, 100(21)：10-18.
[30] YU Lingyu, TIAN Zhenhua. Lamb wave structural health monitoring using a hybrid PZT-laser vibrometer approach[J]. Structural Health Monitoring, 2013, 12(5-6)：469-483.
[31] KUDELA P, RADZIENSKI M, OSTACHOWICZ W. Identification of cracks in thin-walled structures by means of wavenumber filtering[J]. Mechanical Systems and Signal Processing, 2015, 50：456-466.
[32] ROGGE M D, LECKEY C A C. Characterization of impact damage in composite laminates using guided wavefield imaging and local wavenumber domain analysis[J]. Ultrasonics, 2013, 53(7)：1217-1226.
[33] FLYNN E B, CHONG S Y, JARMER G J, et al. Structural imaging through local wavenumber estimation of guided waves[J]. NDT & E International, 2013, 59：1-10.
[34] 朱倩, 裘进浩, 张超, 等. 双层层压材料中激光超声检测方法的应用[J]. 激光与光电子学进展, 2016, 53(3)：031402 (8pp).
ZHU Qian, QIU Jinhao, ZHANG Chao, et al. Application of laser ultrasonic detection method for double-layer laminated material[J]. Laser & Optoelectronics Progress, 2016, 53(3)：031402(8pp).
[35] 顾林霞. 基于频率-波数域分析方法的金属板损伤检测与评估[D]. 江苏：江苏大学, 2016.
GU Linxia. Damage detection and evaluation for metallic plates based on frequency-wavenumber analysis[D]. Jiangsu：Jiangsu University, 2016.
[36] YU Lingyu, TIAN Zhenhua, LECKEY C A C. Crack imaging and quantification in aluminum plates with guided wave[J]. Ultrasonics, 2015, 62：203-212.
[37] KUDELA P, RADZIENSKI M, OSTACHOWICZ W. Impact induced damage assessment by means of Lamb wave image processing[J]. Mechanical Systems and Signal Processing, 2018, 12：23-36.
[38] TIAN Zhenhua, YU Lingyu. Lamb wave frequency–wavenumber analysis and decomposition[J]. Journal of Intelligent Material Systems and Structures, 2014, 25(9)：1107-1123.
[39] IANNI T Di, Marchi L D, Perelli A, et al. Compressive sensing of full wave field data for structural health monitoring applications.[J]. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2015, 62(7):1373-1383.
[40] 刘增华, 曹丽华, 何存富, 等. 铝板中激光Lamb波信号的模态分析与缺陷检测研究[J]. 实验力学, 2016, 31(4)：425-430.
LIU Zenghua, CAO Lihua, HE Cunfu, et al. On the mode identification and defect detection of laser-induced Lamb waves signal in an aluminum plate[J]. Journal of Experimental Mechanics, 2016, 31(4)：425-430.
[41] KIM H, JHANG K, SHIN M, et al. A noncontact NDE method using a laser generated focused-Lamb wave with enhanced defect-detection ability and spatial resolution[J]. NDT & E International, 2006, 39(4)：312-319.
[42] LEE J R, CHEN C C, SHIN H J, et al. Laser ultrasonic propagation imaging method in the frequency domain based on wavelet transformation[J]. Optics & Lasers in Engineering, 2011, 49(1)：167-175.
[43] LI Fucai, MENG Guang, KAGEYAMA K, et al. Optimal mother wavelet selection for Lamb wave analyses[J]. Journal of Intelligent Material Systems and Structures, 2009, 20(10)：1147-1161.