基于EMI结构损伤检测技术的模拟与分析  

Simulation and Analysis of Structural Damage Detection Based on EMI

作　　者：许杨健[1] 韩朋成 

机构地区：[1]河北工程大学土木工程学院,河北邯郸056038

出　　处：《压电与声光》2018年第1期134-137,143,共5页Piezoelectrics & Acoustooptics

基　　金：河北省自然科学基金资助项目(E2010001007;E2011402033)

摘　　要：该文基于压电阻抗法(EMI)对带有损伤板类结构进行模拟分析,研究了损伤拓展对EMI信号的影响规律。首先,采用有限元软件ANSYS建立6种不同损伤情况下的三维精细"压电片(PZT)-主体结构"有限元模型;然后,对有限元模型进行动力谐响应分析,得到考虑损伤深度d、损伤位置与压电片距离s的压电片电导频谱信号;最后,通过横纵向对比分析了板类结构损伤扩展对压电片电导频谱信号的影响规律。分析结果表明,采用建立的含有细小损伤的三维精确压电有限元模型,可以精确地检测到压电片电导纳谱中的共振模态,进而可以很好地识别板类结构局部的细小损伤;验证了现有电阻抗法对含有细小损伤结构分析理论的有效性;当损伤位置越靠近压电片,电导频谱信号模态峰值向左偏移的就越多,因此,通过布置压电片的合理位置可以确定结构细小损伤的位置。Based on the high frequency electromagnetic interference（EMI）method,the damage patch structure is simulated and analyzed,and the influence of damage propagation on the EMI signal is studied in this paper.First,the three-dimensional finite element model considered＂piezoelectric patches（PZT）-main structure＂under six different damage cases is established by the ANSYS software.Then the conductance spectrum signal considering the damage depth of d and the distance s between the damage position and the piezoelectric patch is obtained by using the finite element model to analyze the power-harmonic response.Finally,the effect of the patch structural damage propagation on the conductance spectrum signal of the piezoelectric patch is analyzed with the vertical and horizontal comparison.The analysis results show that the resonant mode in the conductance spectrum of the piezoelectric patch can be accurately measured by using the three-dimensional finite element model contained the fine damage,and then the local minor damage in the patch structure can be recognized very well.The validity of the existing impedance analysis method for the analysis of structures containing small damage is verified.When the damage location is closer to the piezoelectric patch,the more the signal peak of the conductance spectrum signals is shifted to the left,so the location of the fine structure damage can be determined by arranging the reasonable location of the piezoelectric patch.

关 键 词：ANSYS软件 压电片 谐响应分析 电阻抗法 损伤检测 

分 类 号：TN384[电子电信—物理电子学]