摘要
为提高板结构缺陷检测效能,提供一种基于宽带激励的超声局部谐振检测方法。利用最大类间方差法对宽带激励下的超声波场进行了分析处理,得到了缺陷的超声局部谐振频率,并将超声局部谐振频率下声场的空间分布用于板结构损伤检测成像;针对特定材料及厚度的各向同性板结构,通过均匀设计试验的方法,建立了缺陷尺寸与其超声局部谐振频率的关系模型。实验结果表明,所提超声局部谐振检测方法可以高效地实现各向同性及各向异性板结构损伤检测。利用回归分析模型还可实现缺陷几何参数的反演,且反演精度较高(半径反演误差最大为2 mm,厚度反演误差最大为0.6mm)。该方法为板结构缺陷检测及定量分析提供了可行的技术方案。
In order to improve the efficiency of plate structure defect detection,an ultrasonic local resonance detection method based on wideband excitation is developed in this paper.The maximum between-class variance method is used to analyze and process the ultrasonic field under broadband excitation,and the ultrasonic local resonance frequency of the defect is obtained.The acoustic field spatial distribution under ultrasonic local resonance frequency is used in the detection and imaging of the plate structure damage.Aiming at the isotropic plate structure with specific material and thickness,the relationship model of defect size and ultrasonic local resonance frequency is established by means of the uniform design test.The experiment results show that the developed ultrasonic local resonance detection method can effectively achieve the damage detection of isotropic and anisotropic plate structure.With the regression analysis model,the inversion of the geometric parameters of the defects can be achieved,and the inversion precision is high(the maximum radius inversion error is 2 mm,and the maximum thickness inversion error is 0.6 mm).This study provides a feasible technical scheme for the defect detection and quantitative analysis of plate structure.
作者
焦敬品
李立
马百义
何存富
吴斌
Jiao Jingpin;Li Li;Ma Baiyi;He Cunfu;Wu Bin(College of Mechanical Engineering and Applied Electronics Technology,Beijing University of Technology,Beijing 100124,China)
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2019年第12期1-8,共8页
Chinese Journal of Scientific Instrument
基金
国家重点研发计划(2016YFF0203002)
国家自然科学基金(11572010,11772013)项目资助.
关键词
超声波
局部谐振
局部谐振频率
均匀设计
无损检测
定量评价
ultrasound
local resonance
local resonance frequency
uniform design
non-destructive testing
quantitative evaluation
