陕西师范大学学报（自然科学版）2026，Vol.54Issue(2)：74-84,11.DOI:10.15983/j.cnki.jsnu.2026204
基于Lamb波传播模型的缓变厚度板缺陷成像方法
Defect imaging method for slowly varying-thickness plates based on Lamb wave propagation model
摘要
Abstract
The propagation behavior of Lamb waves in variable thickness plates is complex and exhibits significant dispersion effects,which leads to the difficulty of defect localization and imaging.A defect imaging method for slowly varying-thickness plates based on a Lamb wave propagation model is proposed in this paper.A Lamb wave propagation model for variable thickness plates is established,enabling the prediction of response signals through segmented constant thickness approximation and dispersion curve interpolation.A backward propagation phase compensation algorithm is introduced to eliminate signal distortion induced by dispersion effects.Combined with a delay-and-sum imaging algorithm,this approach achieves high-resolution defect imaging in the slowly varying-thickness plates.Numerical simulations and experimental studies are conducted to validate the proposed method.Numerical results demonstrate a positioning error of approximately 5.8 mm for an 8 mm diameter circular hole defect in a 500 mm×500 mm aluminum plate with thickness varying linearly from 2 mm to 4 mm.Experimental results confirm clear defect visualization with a positioning error of about 10 mm,verifying the method's applicability in defect detection for slowly varying-thickness plates.关键词
Lamb波/变厚度板/成像检测/缺陷定位/频散补偿Key words
Lamb wave/variable thickness plate/imaging testing/defect localization/dispersion compensation分类
数理科学引用本文复制引用
王旗,黄尹,许才彬,邓明晰..基于Lamb波传播模型的缓变厚度板缺陷成像方法[J].陕西师范大学学报（自然科学版）,2026,54(2):74-84,11.基金项目
国家自然科学基金(12374430,12134002) （12374430,12134002）
