k-최근접 이웃 알고리즘을 이용한 원공결함을 갖는 유한 폭 판재의 음향방출 음원분류에 대한 연구

Acoustic Emission Source Classification of Finite-width Plate with a Circular Hole Defect using k-Nearest Neighbor Algorithm

  • 이장규 (인천대학교 기계공학과) ;
  • 오진수 (인천대학교 대학원 기계공학과)
  • 발행 : 2009.03.31

초록

A study of fracture to material is getting interest in nuclear and aerospace industry as a viewpoint of safety. Acoustic emission (AE) is a non-destructive testing and new technology to evaluate safety on structures. In previous research continuously, all tensile tests on the pre-defected coupons were performed using the universal testing machine, which machine crosshead was move at a constant speed of 5mm/min. This study is to evaluate an AE source characterization of SM45C steel by using k-nearest neighbor classifier, k-NNC. For this, we used K-means clustering as an unsupervised learning method for obtained multi -variate AE main data sets, and we applied k-NNC as a supervised learning pattern recognition algorithm for obtained multi-variate AE working data sets. As a result, the criteria of Wilk's $\lambda$, D&B(Rij) & Tou are discussed.

키워드

참고문헌

  1. Miller, R. K. and McIntire, P., 1987, Nondestructive Testing Handbook(2nd ed.), Vol. 5, Acoustic Emission Testing, ASNT
  2. Tensi, H. M., 2004, 'The Kaiser-effect and its Scientific Background,' Journal of Acoustic Emission, Vol. 22, pp. s1-s16
  3. Yoshimura, T. and Kano, S., 1987, 'A Method of Rapidly Estimating the Fatigue Limits by Acoustic Emission,' Journal of Acoustic Emission, Vol. 6, No. 3, pp. 145-149
  4. Mukhopadhyay, C. K., Jayakumar, T., Raj, B. and Ray, K. K., 2000, 'Acoustic Emission―Stress Intensity Factor Relations for Tensile Deformation of Notched Specimens of AISI Type 304 Stainless Steel,' Materials Science and Engineering, A293, pp. 137-145 https://doi.org/10.1016/S0921-5093(00)01042-X
  5. Huang, M., Jiang, L., Liaw, P. K., Brooks, C. R., Seeley, R. and Klarstrom, D. L., 1998, 'Using Acoustic Emission in Fatigue and Fracture Materials Research, Journal of Metals, Vol. 50, No. 11
  6. Singh, S. K., Srinivasan, K. and Chakraborty, D., 2003, 'Acoustic Emission Studies on Metallic Specimen under Tensile Loading,' Materials and Design, 24, pp. 471-481 https://doi.org/10.1016/S0261-3069(03)00067-0
  7. Woo, C. K. and Rhee, Z. K., 2008, 'Case Study on the Load-Deflection and Acoustic Emission Analysis of SM45C Coupons with a Circular Hole Defect under Tensile Loading,' Transactions of the Korean Society of Machine Tool Engineers, Vol. 17, No. 1, pp. 50-58
  8. Mitchell, T. M., 1997, Machine Learning, McGraw-Hill
  9. Korean Standards Association, 2002, Test pieces for tensile test for metallics materials, KS B 0801
  10. http://www.matweb.com, MatWeb, The Online Materials Database JIS S45C Steel, Normalized
  11. Rhee, Z. K. and Woo, C. K., 2005, 'Experimental Studies on Joinability of SWS 490A High Tension Steel using Acoustic Emission Signals,' Transactions of the Korean Society of Machine Tool Engineers, Vol. 14, No. 3, pp. 87-85
  12. Rhee, Z. K., 2007, 'AStudy on the Wavelet Transformof Acoustic Emission Signals Generated fromFusion-Welded Butt Joints in Steel during Tensile Test and its Applications,' Transactions of the Korean Society of Machine Tool Engineers, Vol. 16, No. 1, pp. 26-32