基于压电导波的钢梁损伤检测实验  

Experimental on Damage Detection of Steel Beam Based on Piezoelectric Guided Waves

作　　者：王丹生[1] 张富成[1] WANG Dan- sheng;ZHANG Fu-cheng(School of Civil Engineering and Mechanics,Huazhong University of Science and Technology,Wuhan 430074,Chin)

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《土木工程与管理学报》2018年第4期24-31,共8页Journal of Civil Engineering and Management

摘　　要：本文对压电导波应用于钢梁损伤检测进行了实验研究。实验利用压电陶瓷片(PZT)作为导波激励器和接收器,选择1000 mm×30 mm×20 mm的Q235钢梁。首先根据MATLAB求解出的钢梁频散曲线,选择3.5周期,Hanning窗调节的50 k Hz正弦信号作为实验激励信号。实验中,利用双片加载产生的单模态导波(A0导波和S0导波)作为激励信号,并选择不同位置的3个PZT片作为接收器进行损伤检测。实验结果表明:损伤会引起激励信号的反射和透射;A0和S0模态导波都可对损伤进行高精度定位,其中S0导波比A0导波精度高,且将激励器和接收器置于损伤同侧可提高定位精度;损伤反射导波幅值和端面反射导波幅值与损伤程度之间具有很强的线性相关性;通过粘贴200 g砝码实验,得知导波法对结构微小质量增加变化的敏感性很低。Anexperiment was carried out about applying piezoelectric wave to detect the damage of the steel beam. The experiment used piezoelectric ceramic （PZT） as waveguide exciter and receiver and selected a Q235 steel beam of 1000 mmX30 mmX20 mm. First,according to the steel beam dispersion curve solved by MATLAB, the 3.5 cycle, 50 kHz sine signal adjusted by Hanning window was selected as the experimental excitation signal. In the experiment, single-mode guided waves （A0 guided wave and S0 guided wave） generated by double-chip loading were used as the excitation signal respectively, and three PZT sheets in different positions were selected as the receiver to damage detection. The experimental results show that the damage can cause the reflection and transmission of the excitation signal. A0 and S0 guided wave can locate the damage accurately. S0 guided wave’ s accurate ratio is higher than A0 waveguide, and placing the exciter and receiver on the same side of the damage can improve the positioning accuracy; damage reflection wave amplitude and the end of the reflection wave amplitude have a strong linear correlation with the degree of damage; by affixing 200 g weight test, the sensitivity of the waveguide to the small mass increase of structure is very low.

关 键 词：钢梁 PZT LAMB波 损伤检测 实验研究 

分 类 号：TU317.8[建筑科学—结构工程]