Journal ArticleDOI
Characterizing Halbach EMAT Configurations for SH0 Ultrasonic Waves
Reads0
Chats0
TLDR
In this paper, the authors explored the Halbach magnet array pattern as an alternate to the conventional periodic permanent magnet (PPM) structure, and compared the amplitude generated from multiple single-row Halbach EMATs with singlerow PPM EMAT configurations using finite-element-based simulation models for SH0 ultrasonic wave generation.Abstract:
Electromagnetic acoustic transducers (EMATs) can efficiently generate the shear horizontal (SH) guided wave modes. In this article, the Halbach magnet array pattern is explored as an alternate to the conventional periodic permanent magnet (PPM) structure. The magnetic field strength of a Halbach array is significantly higher on one side of the structure while it is weak on the opposite side of the array. This magnetic field distribution enables Halbach EMATs to generate ultrasonic waves with relatively large amplitude. To observe this phenomenon, this study compares the amplitude generated from multiple single-row Halbach EMATs with single-row PPM EMAT configurations using finite-element-based simulation models for SH0 ultrasonic wave generation. This article then presents the ultrasonic wave fields generated by various double-row Halbach EMAT configurations using finite-element-based simulation models and experimentally validated for guided fundamental SH0 mode generated in an aluminum plate specimen. It is observed that distinct ultrasonic guided wave beam patterns be associated and predicted for different double-row Halbach EMAT configurations.read more
Citations
More filters
Proceedings ArticleDOI
Dual-mode second-harmonic (DMSH) generation on an elastic plate medium
TL;DR: In this article , the authors discussed the observation of a simultaneously propagating dual-mode second-harmonic (DMSH) fundamental symmetric (s 0.
Dual-mode second-harmonic (DMSH) generation on an elastic plate medium
TL;DR: In this article , the authors discussed the observation of a simultaneously propagating dual-mode second-harmonic (DMSH) fundamental symmetric (s0) mode and an orthogonal-shear horizontal (SH 0) mode generated on a weekly nonlinear isotropic elastic plate while excited with a primary shear horizontal mode.
Journal ArticleDOI
Damage imaging of a U-shaped boom using improved periodic permanent magnet electromagnetic acoustic transducers
TL;DR: In this paper , an improved periodic permanent magnet electromagnetic acoustic transducer (PPM EMAT) was proposed for defect detection for a U-shaped boom, which has superior frequency response characteristics and acoustic field directivity, which is suitable for detecting large and complex structures.
References
More filters
Book ChapterDOI
A New Structure of SH Wave Electromagnetic Acoustic Transducer (EMAT)
Yang Xu,Akihiro Tagawa,Masashi Ueda,Takuya Yamashita,Y. Ohtsuka,Kazunori Osafune,Masahiro Nishikawa +6 more
TL;DR: In this paper, the in service inspection (ISI) for the reactor vessel of the fast breeder reactor MONJU is performed in a severe environment of elevated temperature (about 200 centigrade) and high level radiation field (about I000R/h).
Proceedings ArticleDOI
Development of the ISI Device for Fast Breeder Reactor MONJU Reactor Vessel
TL;DR: In this article, a new inspection device has been developed in order to improve the visual test performance, volumetric test performance and controllability of the inspection device reflecting the experience of the original test.
Proceedings ArticleDOI
Reflection study of SH0 mode with plate edge at different incident angles
TL;DR: In this article, the reflection behavior of SH0 guided wave mode from a flat plate edge is investigated using Periodic Permanent Magnet - Electromagnetic Acoustic Transducers (PPM-EMAT) of constant wavelength (λ).