摘要
针对压电层合板智能结构,建立了压电阻抗的计算模型,从理论上分析了压电阻抗与结构机械阻抗的相关性,并对冲击损伤试件的压电阻抗进行了实验测试。理论分析和实验研究表明,通过直接测量压电阻抗并提取与冲击损伤相关的特征信息来评价冲击损伤的方法是可行的。该方法基于压电智能结构的机-电动态阻抗特性,不受结构的几何形状限制。测试用的压电元件成本低、且对主体结构刚度的影响很小,测量压电阻抗的方法简单可行,易于实现压电层合智能结构冲击损伤的自诊断功能,有望作为一种新技术在飞行器结构损伤监测方面获得实际应用。
The computational model of piezoelectric impedance for a laminated plate pasted piezoelectric wafer is established.It is analyzed theoretically that the piezoelectric impedance has relations with the mechanical impedance of structures.The piezoelectric impedance of the specimen with impact damage is tested experimentally.Theoretical analysis and experimental study show that it is feasible to evaluate the characteristics of impact damage through measuring directly piezoelectric impedance and extracting relevant feature information involving in impact damage.The method is based on dynamic electro-mechanical impedance characteristics of piezoelectric smart structures without restrictions of structural geometry.The piezoelectric components with low cost and little effect on the stiffness of the main structures could be easily used to implement the function of impact damage self-diagnosis for piezoelectric laminated smart structures.The method proposed is expected to find practical application in monitoring damage of aircraft structures as a new technology.
出处
《振动与冲击》
EI
CSCD
北大核心
2008年第6期114-117,共4页
Journal of Vibration and Shock
基金
国家自然科学基金(10672077)资助项目
关键词
智能结构
压电阻抗
冲击损伤
损伤因子
自诊断
smart structures
piezoelectric impedance
impact damage
damage factor
self-diagnosis
