Volume 29 Issue 3
Mar.  2014
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Article Navigation >  Journal of Aerospace Power  > 2014  >  29(3): 504-510
SHENG Jing, WEI Min-xiang, LIU Guo-man, LI Yu-fang. Calculating method of knock factors based on method of intrinsic mode function high-frequency integral energy for kerosene engine[J]. Journal of Aerospace Power, 2014, 29(3): 504-510. doi: 10.13224/j.cnki.jasp.2014.03.004
Citation: SHENG Jing, WEI Min-xiang, LIU Guo-man, LI Yu-fang. Calculating method of knock factors based on method of intrinsic mode function high-frequency integral energy for kerosene engine[J]. Journal of Aerospace Power, 2014, 29(3): 504-510. doi: 10.13224/j.cnki.jasp.2014.03.004
shu

Calculating method of knock factors based on method of intrinsic mode function high-frequency integral energy for kerosene engine

doi: 10.13224/j.cnki.jasp.2014.03.004

  • 1. College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;

  • 2. College of Mechanical and Electrical Engineering, Nanchang Institute of Technology, Nanchang 330099, China;

  • 3. Bearer Network Product Pre-research Department, Zhongxing Telecom Equipment Corporation Limited, Nanjing 210012, China

  • Received Date: 2013-06-05
  • Publish Date: 2014-03-28
    Abstract
  • The method of intrinsic mode function high-frequency integral energy was proposed. In this method,the cylinder combustion pressure signals of the electronic controlled two-stroke kerosene engine were decomposed into a finite number of intrinsic mode function components and the residual function using the empirical mode decomposition method. The knock high frequency signal component was obtained by analyzing the intrinsic mode function components using the fast Fourier transform(FFT). The crank angle corresponding to the peak of the residual function peak was chosen as the starting crank angle of the knock window. Then the knock factors were calculated using the method of intrinsic mode function high frequency integral energy based on the knock high frequency signal component. By analyzing the knock window width, it's learnt is that a reasonable constant crank angle of knock window width is 30°. Knock factors of cylinder combustion pressure signals for four cycles were calculated using the method of intrinsic mode function high-frequency integral energy. Four cycles include non-knocking cycle, slight knock cycle, moderate knock cycle and strong knock cycle. The knock factors of four cycles include 0.6642, 1.8191, 3.0275 and 5.3717, which could represent the strength of knock. Research shows that the method of intrinsic mode function high-frequency integral energy in the process of knock factors calculation for the electronic controlled two-stroke kerosene engine is practical and effective.

     

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