管道导波振动模态分析及缺陷周向定位研究  

Study on vibration modal and circumferential location of pipeline defects

作　　者：陈乐[1] 王悦民[1] 耿海泉 叶伟[1] 邓文力 CHEN Le;WANG Yue-min;GENG Hai-quan;YE Wei;DENG Wen-li(Power Engineering College,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学动力工程学院,武汉430033

出　　处：《船舶力学》2018年第10期1268-1276,共9页Journal of Ship Mechanics

基　　金：总装备部装备预研基金(9140A27020115JB11001)

摘　　要：针对磁致伸缩导波无法确定管道缺陷周向位置的弊端,研究了一种利用阵列式磁致伸缩导波传感器对管道裂纹进行周向定位的方法。分析了非轴对称声源所激发导波的振动模态,计算了在特定轴向位置处导波的能量圆周分布,根据调制方法计算了能量聚焦于某一周向角度时阵列传感器各激励通道所需的调制值。通过对多通道接收信号进行相应的逆向调制并叠加合成,实现导波能量在某一角度上的虚拟聚焦。按不同聚焦角度进行逆向调制,可以实现圆周方向的扫查,从而确定缺陷的周向位置。仿真和实验结果表明:非轴对称缺陷反射的导波与非轴对称声源激励的导波在位移云图、波形图和能量的圆周分布方面具有很大的相似性;逆向调制方法可有效定位出缺陷在管道中的周向位置。In view of the disadvantages of verifying the defect location in circumferential direction by the magnetostrictive guided wave,a circumferential positioning method by using the array guided wave sensor was studied.The energy distribution of the guided waves induced by a non-axisymmetric magnetostrictive acoustic source in a certain axial position was studied.The tuning value of each excitation channel for the energy focusing was calculated.In order to achieve the virtual focusing at the specified angle,the multi-channel received signals were reverse tuned and superposed.Reverse modulation according to different focusing angles realized the scanning in circumferential direction,so as to determine circumferential position of the defect.The simulation and experiment results show that the non-axisymmetric defect reflection signals and non-axisymmetric acoustic source signal have great similarity in displacement contour,waveform and angular profile,and the reverse modulation method can effectively locate the defects in circumferential position.

关 键 词：模态分析 阵列传感器 磁致伸缩超声导波 能量调制 周向定位 

分 类 号：TG115.28[金属学及工艺—物理冶金]