Wavelet analysis of in-cylinder LDV velocity measurements

Magnus Wiktorsson, Fredrik Söderberg, Bengt Johansson, Bengt Lindoff

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review


The Discrete Wavelet Transform (DWT) is a new way to analyze gas flow measurements in engine cylinders. The DWT technique differs significantly from the Fast Fourier Transform (FFT) in that with the former, the analysis of information can be done in both the time domain and frequency domain. The basic theory of wavelets is presented and the use of DWT is demonstrated on information derived from laser Doppler velocity (LDV) measurements for different geometrical configurations of combustion chambers in a natural gas converted truck engine.
Original languageEnglish
Title of host publication[Host publication title missing]
ISBN (Print)1-56091-869-1
Publication statusPublished - 1996
EventSAE International Fall Fuels and Lubricants Meeting and Exposition - San Antonio, Texas, United States
Duration: 1996 Oct 141996 Oct 17

Publication series



ConferenceSAE International Fall Fuels and Lubricants Meeting and Exposition
Country/TerritoryUnited States
CitySan Antonio, Texas

Subject classification (UKÄ)

  • Probability Theory and Statistics

Free keywords

  • Natural gas converted engine
  • Discrete wavelet transforms (DWT)
  • Gas engines
  • Laser Doppler velocimeters
  • Velocity measurement
  • Fast Fourier transforms
  • Flow measurement
  • Wavelet transforms
  • Engine cylinders
  • Combustion chambers
  • Turbulence
  • Time domain analysis
  • Frequency domain analysis
  • Automotive fuel


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