文献类型：期刊文献

英文题名：Design and application of an upright waveguide transducer for single-mode guided wave excitation for delamination monitoring in composite structures

作者：Xu, Wenjie[1];Zhou, Shaoping[1];Luo, Zhi[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2025

卷号：36

期号：11

外文期刊名：MEASUREMENT SCIENCE AND TECHNOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001619304800001)】；

基金：This work was supported by the National Natural Science Foundation of China (Grant Nos. 52175137, 52205151), and Key Technologies Research and Development Program (Grant No. 2021YFB400800).

语种：英文

外文关键词：structural health monitoring; guided waves; upright waveguide transducer; delamination damage; mode conversion

摘要：To address the challenges of multimode interference and complex signal interpretation in guided wave-based delamination monitoring of composite structures, while overcoming the drawbacks of conventional single-mode piezoelectric transducers-including high cost, limited bandwidth and coupling dependence-this study proposes a novel upright waveguide transducer (UWT) based on the mode conversion mechanism. Using a dual-source excitation strategy, a pure S0 mode Lamb wave is generated and guided along the upright waveguide. The dominant in-plane motion of S0 mode in the upright waveguide is efficiently converted into out-of-plane motion of the single A0 mode within the horizontal test specimen. This mechanism suppresses interference from S0 mode and quasi-mode, denoted here as S0 ', enhancing both the excitation purity and energy coupling efficiency of the A0 mode. Furthermore, a mode-conversion sensing network based on the UWT is developed, along with a path-grouping discrimination and localization algorithm. This integrated framework effectively addresses challenges such as baseline dependency and environmental variation, while also providing a practical solution for real-time implementation with localization accuracy and simplified measurement. Finite element simulations and experimental validations confirm that the proposed transducer significantly reduces signal interference and improves interpretability, offering a robust technical solution for composite structures' online structural health monitoring when coupled with the proposed algorithm.