摘要
在结构健康监测系统中,基于应力波的结构损伤诊断技术是一种主动的局部损伤检测方法。压电晶体传感器作为激励部件可以在结构中引入高频应力波;其同裂纹等局部损伤发生相互作用将产生波动的能量耗散、波形反射以及波形干涉等现象。通过对附着在无约束金属板上的压电晶体传感器(PZT)激励模型的理论分析及有限元数值计算,说明PZT能有效地产生检测应力波,并可将其应用在结构局部损伤检测中。
Using piezoelectric wafer embedded inside structure for nondestructive evaluation of micro crack has been researched by many researchers in the field of structural health monitoring system. High frequency guided ultrasonic waves induced into structures by piezoelectric sensors may interact with damages in the structures. The phenomenon of energy dissipation, wave reflection and wave intervening with damages will occur when damage exists, which could be detected and located with the information contained in the wave data. The electrical impedance model and numeric analysis of the piezoelectric wafer alone in vacuum and then of the embedded wafer is proposed. PZT may effectively generate Lamb wave, which can be used in the detection of micro crack in structures.
出处
《传感技术学报》
CAS
CSCD
北大核心
2005年第2期215-220,共6页
Chinese Journal of Sensors and Actuators
