Experimental Research on Excitation of Single Mode of Lamb Waves and Defect Detection by Using Piezoelectric Ceramic Wafers
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摘要: 为了激励Lamb波单一模态的S0和A0,采用2个相同的直径14 mm、厚0.8 mm的压电陶瓷片对称粘贴在2 mm厚的有机玻璃板上作激励传感器,在另一位置布置同一尺寸的压电陶瓷片作接收传感器.采用一发一收法,在低于100 kHz的频段内,激励传感器在板中分别单片、2片对称和反对称并联激励Lamb波,分析接收信号中模态成分的变化.并在此基础上,采用3种不同的激励Lamb波的方式对板中模拟缺陷进行了检测.实验结果表明,在一定频段内,对称并联激励压电陶瓷片可以有效抑制A0模态,得到较为单一的S0模态,而反对称并联激励压电陶瓷片能有效抑制S0模态,得到较为单一的A0模态;激励的Lamb波信号中模态越单一,缺陷回波越易识别.Abstract: To excite single S0 mode and single A0 mode of Lamb waves,two same piezoelectric ceramic wafers of which diameter is 14 mm and thickness is 0.8 mm bonded in the PMMA plate symmetrically are applied as actuators,and a piezoelectric ceramic wafer of the same size arranged in another position is applied as the sensor.In the frequency range of below 100 kHz,according to pitch-catch arrangement,the actuator excites Lamb waves alone or two actuators excite Lamb waves in parallel symmetrically or antisymmetrically.And then the change of mode components in the signals received by the sensor is analyzed.Based on the experimental result,three Lamb wave excitation methods are applied to detect the simulated defect in the plate.Experimental results show that in a certain frequency range,the method of exciting piezoelectric ceramic wafers in parallel symmetrically can suppress A0 mode effectively,and acquire single S0 mode relatively,and meanwhile the method of exciting piezoelectric ceramic wafers in parallel antisymmetrically can suppress S0 mode effectively and acquire single A0 mode relatively.The fewer the modes of Lamb waves excited are,the easier it is to identify the echoes from the defects.
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Keywords:
- Lamb waves /
- thin plate /
- S0 mode /
- A0 mode /
- defect
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[1] 刘镇清,刘骁.超声无损检测的若干新进展[J].无损检测,2000,22(9):403-405.LIU Zhen-qing,LIU Xiao.Development of ultrasonic nondestructive testing techniques[J].Nondestructive Testing,2000,22(9):403-405.(in Chinese) [2] 何存富,怀保玲,杜婷,等.基于兰姆波的大型罐体液位定点检测方法[J].机械工程学报,2007,43(6):99-104.HE Cun-fu,HUAI Bao-ling,DU Ting,et al.Method monitoring fixed liquid level of large tanks using Lamb waves[J].Chinese Journal of Mechanical Engineering,2007,43(6):99-104.(in Chinese) [3] 严刚,周丽.应用遗传算法和散射Lamb波的板结构损伤识别[J].振动工程学报,2007,20(3):291-296.YAN Gang,ZHOU Li.Damage identification for plate-like structure using genetic algorithms and scattered Lamb waves[J].Journal of Vibration Engineering,2007,20(3):291-296.(in Chinese) [4] GIURGIUTIU V.Tuned Lamb wave excitation and detection with piezoelectric wafer active sensors for structural healthmonitoring[J].Journal of Intelligent Material Systems and Structures,2005,16(4):291-305.
[5] MICHAELS J E.Detection,localization and characterization of damage in plates with an in situ array of spatially distributedultrasonic sensors[J].Smart Materials and Structures,2008,17(3):035035.1-035035.15.
[6] WORLTON D C.Ultrasonic testing with Lamb waves[J].Nondestructive Testing,1957,15(4):218-222.
[7] BENZ R,NIETHAMMER M,HURLEBAUS S,et al.Localization of notches with Lamb waves[J].Journal of AcousticalSociety of America,2003,114(2):677-685.
[8] LU Ye,YE Lin,SU Zhong-qing.Crack identification in aluminum plates using Lamb wave signals of a PZT sensor network[J].Smart Materials and Structures,2006,15(3):839-849.
[9] WANG X,LU Y,TANG J.Damage detection using piezoelectric transducers and the Lamb wave approach:I.system analysis[J].Smart Materials and Structures,2008,17(2):1-15.
[10] 王强,袁慎芳.主动Lamb波损伤成像监测中的波包重建方法[J].宇航学报,2009,30(3):1207-1211.WANG Qiang,YUAN Shen-fang.Wave rebuilding method for the active Lamb wave based structural damage imaging[J].Journal of Astronautics,2009,30(3):1207-1211.(in Chinese) [11] 曹小杉,金峰,王子昆.功能梯度材料板中Lamb波传播特性研究[J].固体力学学报,2009,30(1):35-41.CAO Xiao-shan,JIN Feng,WANG Zi-kun.Propagation properties of Lamb waves in a functionally graded material plate[J].Chinese Journal of Solid Mechanics,2009,30(1):35-41.(in Chinese) [12] 何存富,刘溯,刘增华,等.小波降噪在钢绞线缺陷检测中的应用[J].机械工程学报,2008,44(7):118-122.HE Cun-fu,LIU Su,LIU Zeng-hua,et al.Application of wavelet denoise in defect inspection of steel strands[J].ChineseJournal of Mechanical Engineering,2008,44(7):118-122.(in Chinese) [13] LI Fu-cai,MENG Guang,KAGEYAMA Kazuro,et al.Optimal mother wavelet selection for Lamb wave analyses[J].Journal of Intelligent Material Systems and Structures,2009,20(10):1147-1161.
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