Journal of the Korea Society of Computer and Information (한국컴퓨터정보학회논문지)

Korean Society of Computer Information (한국컴퓨터정보학회)
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Bearing Faults Identification of an Induction Motor using Acoustic Emission Signals and Histogram Modeling

음향 방출 신호와 히스토그램 모델링을 이용한 유도전동기의 베어링 결함 검출

  • Jang, Won-Chul (School of Electrical and Computer Engineering, University of Ulsan) ;
  • Seo, Jun-Sang (School of Electrical and Computer Engineering, University of Ulsan) ;
  • Kim, Jong-Myon (School of Electrical and Computer Engineering, University of Ulsan)
  • 장원철 (울산대학교 전기전자컴퓨터공학과) ;
  • 서준상 (울산대학교 전기전자컴퓨터공학과) ;
  • 김종면 (울산대학교 전기전자컴퓨터공학과)
  • Received : 2014.06.26
  • Accepted : 2014.09.19
  • Published : 2014.11.29
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Abstract

This paper proposes a fault detection method for low-speed rolling element bearings of an induction motor using acoustic emission signals and histogram modeling. The proposed method performs envelop modeling of the histogram of normalized fault signals. It then extracts and selects significant features of each fault using partial autocorrelation coefficients and distance evaluation technique, respectively. Finally, using the extracted features as inputs, the support vector regression (SVR) classifies bearing's inner, outer, and roller faults. To obtain optimal classification performance, we evaluate the proposed method with varying an adjustable parameter of the Gaussian radial basis function of SVR from 0.01 to 1.0 and the number of features from 2 to 150. Experimental results show that the proposed fault identification method using 0.64-0.65 of the adjustable parameter and 75 features achieves 91% in classification performance and outperforms conventional fault diagnosis methods as well.

본 논문에서는 저속으로 회전하는 유도 전동기의 베어링 결함을 검출하기 위해 음향 방출 신호와 히스토그램 모델링을 이용하는 방법을 제안한다. 제안한 방법은 정규화된 결함 신호가 구성하는 히스토그램의 포락선을 모델링하여, 부분 상관 계수와 DET(Distance Evaluation Technique) 기법을 이용하여 결함 유형별 고유한 특징을 추출 및 선택한다. 추출된 특징을 SVR(Support Vector Regression) 분류기의 입력으로 사용하여 베어링의 내륜, 외륜 및 롤러 결함을 분류한다. 최적의 분류 성능을 위해 SVR 커널함수의 매개변수를 0.01에서 1.0까지 변화시키고, 특징 개수는 2에서 150까지 변화시키면서 실험한 결과, 0.64-0.65의 매개변수와 75개의 특징 개수에서 제안한 방법은 약 91%의 분류 성능을 보였고, 또한 기존의 결함 분류 알고리즘보다 높은 분류 성능을 보였다.

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