@inproceedings{5379fe43a8434dc7969ad1671ab34cee,
title = "Two-dimensional analysis of subharmonic ultrasound generation at closed cracks by damped double nodes",
abstract = "Evaluation of closed cracks is the most serious issue for safety of important structures such as power plants or air planes. To overcome the problem, subharmonics in nonlinear ultrasound is particularly useful because of the excellent selectivity for closed cracks and high temporal resolution, which has been verified by the subharmonic phased array for crack evaluation (SPACE), developed by the authors. In this study, we propose the first two dimensional (2D) model to reproduce subharmonic generation at closed cracks using damped double nodes (DDN). Numerical simulation using finite difference time domain (FDTD) method was performed using DDN and time frequency analysis was performed based on the wavelet analysis. The results were able to reproduce essential features observed in the experiments.",
keywords = "Closed Crack, Double Node, FDTD, Nonlinear, Subharmonic, Ultrasonic Testing (UT)",
author = "Kazushi Yamanaka and Yohei Shintaku and Miyuki Oguma and Yoshikazu Ohara",
year = "2011",
language = "English",
series = "NDT in Progress 2011 - 6th International Workshop of NDT Experts, Proceedings",
publisher = "Brno University of Technology",
pages = "327--332",
editor = "Pavel Mazal",
booktitle = "NDT in Progress 2011 - 6th International Workshop of NDT Experts, Proceedings",
address = "Czech Republic",
note = "6th International Workshop NDT in Progress 2011 ; Conference date: 10-10-2011 Through 12-10-2011",
}