摘要
非线性Lamb波监测技术是结构健康监测研究的热点之一。为了解决线性Lamb波监测结构早期微损伤敏感度低的问题,采用具有积累效应的(S1,S2)对称模式非线性Lamb波方法,实现对金属结构材料非线性变化的定量监测。实验结果表明,非线性Lamb波信号及特征参数对结构材料非线性变化十分敏感,且随模拟疲劳损伤范围的扩大,特征参数呈线性增长,而基频信号的变化很微弱,从而验证了非线性Lamb波方法对疲劳等结构早期损伤监测的有效性和可行性。
The nonlinear Lamb wave monitoring technology is one of the hot topics in the structural health monitoring.To solve the low sensitivity problem in the early micro damage of linear Lamb wave monitoring structure,this article adopts the symmetric mode（S1,S2）nonlinear Lamb wave which has a cumulative effect to achieve quantitative monitoring of metallic structural material nonlinear changes.The results show that the nonlinear Lamb wave signals and characteristic parameters are sensitive to structural material nonlinearity change.With the increasing of simulative fatigue damage scope expanding,the characteristic parameter grows linearly,but the change of fundamental frequency signal is weak.The results validated the feasibility and effectiveness of the nonlinear Lamb wave method to early structure fatigue damage monitoring.
出处
《压电与声光》
CAS
CSCD
北大核心
2016年第1期170-173,共4页
Piezoelectrics & Acoustooptics
基金
国家自然科学基金资助项目(11202107)
教育部高等学校博士学科点专项科研基金资助项目(20113223120008)
中央高校基本科研业务费专项基金资助项目(NJ20140014)
关键词
非线性Lamb波
结构健康监测
积累效应
疲劳损伤
特征参数
nonlinear Lamb wave
structural health monitoring
cumulative effect
fatigue damage
characteristic parameters
