Browse > Article

Acoustic Emission Source Location and Material Characterization Evaluation of Fiberboards  

Ro Sing-Nam (서울산업대학교 기계공학과)
Park Ik-Keum (서울산업대학교 기계공학과)
Sen Seong-Won (서울산업대학교 기계공학과)
Kim Yong-Kwon (서울산업대학교 에너지 환경대학원)
Publication Information
Transactions of the Korean Society of Machine Tool Engineers / v.14, no.3, 2005 , pp. 96-102 More about this Journal
Abstract
Acoustic Emission(AE) technique has been applied to not only material characterization evaluation but also on-line monitoring of the structural integrity. The AE source location technique is very important to identify the source, such as crack, leak detection. Since the AE waveforms obtained from sensors are very difficult to distinguish the defect signals, therefore, it is necessary to consider the signal analysis of the transient wave-form. In this study, we have divided the region of interest into a set finite elements, and calculated the arrival time differences between sensors by using the velocities at every degree from 0 to 90. A new technique for the source location of acoustic emission in fiberboard plates has been studied by introducing Wavelet Transform(WT) do-noising technique. WT is a powerful tool for processing transient signals with temporally varying spectra. If the WT de-noising was employed, we could successfully filter out the errors of source location in fiberboard plates by arrival time difference method. The accuracy of source location appeared to be significantly improved.
Keywords
Acoustic Emission(AE); Source location; Material characterization; Wavelet transform; De-noising; Arriving time difference;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Inoue, H., 1996, 'Experimental Wavelet Analysis of Flexural Waves in Beams,' Experimental Mechanics, Vol. 36, No. 3, pp. 212-217   DOI   ScienceOn
2 Kishomoto, K., 1995, 'Time-Frequency Analysis of Dispersive Waves by Means of Wavelet Transform,' Transaction of the ASME, Journal of Applied Mechanics, Vol. 62, No. 4, pp. 841-846
3 Misiti, M., 1997, Wavelet Toolbox User's Guide, For use With MATLAB, The Math Works
4 Gorman, M. R., 1991, 'Plate Wave Acoustic Emission,' J. of Acoustical Society of America, Vol. 90, No. 1, pp. 358-364   DOI
5 Anthony, R. W., 1993, 'Application of Acoustic- Ultrasonics to Finger-jointed Lumber,' The American Society for Nondestructive Testing, Inc., Second International Conference on Acousto-Ultrasonics, pp. 191-200
6 Gorman, M. R., and Prosser, W. H., 1990, 'AE Source Orientation by Plate Wave Analysis,' J. of Acoustic Emission, Vol. 9, No. 4, pp. 283-288
7 Rhee, Z. K., Park, S. O. and Woo, C. K., 2004, 'AE Source Location in Planar Defects using Spot Excitation,' Transactions of the Korean Society of Machine Tool Engineers, Vol. 13, No. 5, pp. 87-95