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载荷影响下的机电阻抗协整结构损伤识别方法
Structural Damage Identification Under Load Based on Electromechanical Impedance Co-integration
  
DOI:10.16450/j.cnki.issn.1004-6801.2020.03.015
中文关键词:  结构健康监测  高频机电阻抗技术  荷载影响  协整  螺栓松动
英文关键词:structural health monitoring (SHM)  electromechanical impedance (EMI)  influence of load  co-integration  bolt loosening
基金项目:国家自然科学基金资助项目(51378402,51975581)
作者单位
揭小落,肖黎,屈文忠 (武汉大学工程力学系武汉430072) 
摘要点击次数: 83
全文下载次数: 102
中文摘要:
      高频机电阻抗(electromechanical impedance, 简称EMI)方法利用粘贴在结构表面的压电传感器(piezoelectric transducer, 简称PZT)进行主动激励,通过连续监测和分析PZT机电导纳信号的变化评估结构的健康状态;然而EMI方法容易受到环境工况变化的影响,导致结构损伤的误报。针对此问题,采用时间序列协整方法处理及消除结构工作载荷对阻抗谱特征信号的影响。该方法是基于结构动荷载作用下PZT阻抗谱导纳信号的非平稳特征,将动荷载影响下的阻抗谱非平稳时间序列经线性组合变换成平稳时间序列,根据得到的协整余量序列有效判断结构的健康状态。为验证该方法的有效性,开展了动应力影响下铝梁结构的螺栓松动损伤识别实验。结果表明,协整消除了动态应力对EMI方法的影响,当铝梁内存在持续变化的应力时,仍可以准确识别螺栓松动。机电阻抗协整方法能够消除结构健康监测中荷载作用的影响,及时准确地进行结构损伤识别。
英文摘要:
      The high-frequency electromechanical impedance (EMI) method creates active motivation by piezoelectric transducers (PZT) affixed to the surface of the structure, and monitor the structure's health by continuous monitoring and analyzing changes of admittance signals of PZT. However, the EMI method is susceptible to environmental and operational variations, leading to false alarms of structural damage. In light of this problem, the impact of the structural workload on the electromechanical impedance signatures is eliminated by the time series co-integration method. This method is based on the non-stationary characteristics of the PZT impedance spectrum admittance signal under the dynamic load of the structure. The non-stationary time series of the impedance spectrum under the influence of the dynamic load is transformed into a stationary time series by linear combination and the health of the structure is determined according to the co-integration margin sequence. The experiments of loose bolt damage identification of aluminum beam structure under dynamic stress are carried out to verify the effectiveness of the proposed method. The results show that the method can isolate damage-sensitive features from stress variations to detect the existence of bolt loosening. The EMI co-integration method can eliminate the impact of load on structural health monitoring and time to identify structural damage.
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