基于压电陶瓷动态信息的结构损伤检测技术

依据压电材料的压电效应特性,压电陶瓷片既可作为传感器又可作为驱动器.将压电陶瓷片粘贴在待测结构的表面,运用压电阻抗技术对结构中螺栓松动的损伤进行检测分析,实验表明,通过检测压电动态阻抗的变化可分析出螺栓松动的结构损伤情况.基于压电陶瓷的结构损伤检测技术,可以对机械结构进行实时在线损伤检测,它不仅适用于宏观损伤的检测,在高频激励下对于微小损伤的检测也非常有效.

Testing Technology for Structure Damages Based on Piezoelectric Ceramics Dynamic Information

Based on the piezoelectric effect of piezoelectric materials,piezoceremic patches(PZT) can be used both as sensors and drivers.By sticking PZT onto the surface of the structure to be tested and employing piezoelectric impedance technology,this paper analyzes and tests the damages of loose bolts in a structure.Piezoceremic-based testing technology for structure damages can be used for real-time on-line damage testing in mechanical structures.It can be used not only to test macro damages,but also to test micro damages with the excitation of high frequency.