Welcome to Acta Armamentarii ! Today is

Acta Armamentarii ›› 2024, Vol. 45 ›› Issue (2): 684-694.doi: 10.12382/bgxb.2022.1021

Previous Articles    

Fault Diagnosis Method for Diesel Engine Based on Texture Analysis

LIU Zichang, LI Siyu, PEI Mochao, LIU Jie, MENG Shuo, WU Weiyi*()   

  1. Shijiazhuang Campus of Army Engineering University, Shijiazhuang 050003, Hebei, China
  • Received:2022-11-03 Online:2024-02-29
  • Contact: WU Weiyi

Abstract:

Diesel engine fault feature extraction is a key step in the process of fault identification, which is directly related to the accuracy and timeliness of identification. The texture analysis theory is applied to diesel engine fault feature extraction, and a fault feature extraction method based on modified hierarchical decomposition (MHD) and grayscale image processing is proposed. A single one-dimensional vibration signal sample is decomposed into multiple one-dimensional sub-signals and converted into a grayscale image separately using MHD. The features from accelerated segment test (FAST) algorithm is used to detect the feature points of grayscale image; the image is convolved by the real part of Gabor filter bank, and the histograms are computed as feature vectors using the responses of the feature points. In order to test the ability of the fault features extracted by the proposed method to recognize the different fault types of diesel engine, non-dominated sorting genetic algorithm-Ⅱ (NSGA-Ⅱ) and support vector machine (SVM) are introduced for fault status recognition. Preset fault experiments are carried out through a experimental bench to compare the proposed method with the traditional method. The experimental results show that the proposed method has the highest fault diagnosis accuracy and provides a new idea for diesel engine fault diagnosis.

Key words: diesel engine, texture analysis, modified hierarchical decomposition, non-dominated sorting genetic algorithm-Ⅱ, support vector machine

CLC Number: