基于阻抗技术的压电元件自损伤检测  

Piezoelectric Transducer Self-Diagnosis Based on Impedance Technology

作　　者：孙佳[1] 裘进浩[1] 费利萍[2] 袁欣[1] 

机构地区：[1]南京航空航天大学机械结构强度与振动国家重点实验室,南京210016 [2]浙江省计量科学研究院,杭州310013

出　　处：《振动．测试与诊断》2011年第4期454-458,534,共5页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金重点资助项目(编号:50830201);长江学者和创新团队发展计划资助项目(编号:IRT0968)

摘　　要：为了保证结构健康监测系统的有效运行,基于压电阻抗技术原理,提出了一种压电传感、驱动元件自损伤检测方法。通过研究压电元件等效电容值(压电元件导纳虚部数值)的变化,判别压电元件是否破损及其与主体结构之间是否剥离,并在悬臂梁结构上进行压电元件自损伤检测试验。结果表明,相比压电元件完好的情况,各频率下压电元件电纳值随脱粘部分面积的增加而上升,随破裂部分面积的增加而下降,并且损伤程度和等效电容变化量成比例关系,与理论分析结果吻合较好。This paper proposes a piezoelectric sensor/actuator self-diagnostic procedure based on the principle of piezoelectric impedance technology to ensure the effective operation of the structural health monitoring(SHM) system.The premise of this procedure is to track the changes in the capacitive value of piezoelectric materials resulting from the degradation of the mechanical/electrical properties and its attachment to a host structure,which is manifested in the imaginary part of the measured electrical admittances.Experiment is carried out on a cantilever beam attached with a PZT sheet to demonstrate the feasibility of the proposed procedure.The results are in good agreement with theoretical analysis that,compared to the case of good PZT transducers,the debonding between PZT transducers and the host causes an upward shift in the slope of the imaginary part of the admittance while the crack PZT transducers causes a downward shift in the slope.The degree of the damage is proportional to the change of the capacitive value.

关 键 词：结构健康监测 自损伤检测 压电材料 电纳 压电阻抗技术 

分 类 号：TM282[一般工业技术—材料科学与工程] TP206[电气工程—电工理论与新技术]