基于压电超声相控阵方法的结构多损伤监测  

Structure Multi-damage Monitoring Based on the Piezoelectric Ultrasonic Phased Array

作　　者：王志凌[1,2] 袁慎芳[1] 邱雷[1] 钟永腾[1] 

机构地区：[1]南京航空航天大学机械结构力学及控制国家重点实验室,南京210016 [2]南京航空航天大学金城学院,南京211156

出　　处：《振动．测试与诊断》2014年第5期796-801,970,共6页Journal of Vibration,Measurement & Diagnosis

基　　金：国家杰出青年基金资助项目(51225502);国家自然科学基金资助项目(51205189)

摘　　要：基于超声相控阵的主动结构健康监测是飞行器结构健康监测领域一个新的发展方向,也是当前研究的难点之一,超声相控阵结构健康监测在国内还处于起步阶段。在已有应用超声相控阵技术对单损伤定位的基础上,进一步研究飞行器结构中多损伤的监测。通过控制信号的延时,进而控制波束指向,实现对结构的多方位、多损伤扫描。在铝板上进行了实验研究,通过对比不同角度延时前后的损伤散射信号及其合成信号,验证了超声相控阵对多损伤信号的延时叠加能够有效地提高多损伤信号的能量,同时减少非损伤处的能量,从而增强了信号的信噪比,并且对多损伤识别具有较高精度。A recent development in the field of aircraft structural health monitoring is active structural health monitoring based on ultrasonic phased array.Based on existing applications of ultrasonic phased array technology for single damage localization,this paper studies multi-damage monitoring in the aircraft structures.Multi-damage and multi-direction scanning can be achieved by controlling the time delay in order to control wave direction.Experiments are conducted on an aluminum plate.By comparing the damage reflection signals before and after a time delay of different angles and their synthesized signals,it can be proved that delay-superposition of the ultrasonic phased array can effectively increase the multi-damage signal energy,and reduce the signal energy where there is no damage.This improves the signal to noise ratio and demonstrates high accuracy for multiple damage identification.

关 键 词：LAMB波 超声相控阵 线阵换能器 单模式 多损伤 

分 类 号：TB553[理学—物理]