Aero-acoustic test post-processing

PSA Peugeot Citroen implemens Scilab in the Fluid Mechanics, Thermals & Aeroacoutics department.
It enables fast processing of their data and easy visual representation.


Context: Fluid Mechanics, Thermals and Aeroacoutics department (MFTA)

  • Studying vehicle penetration in the air
    • Decreasing consumption by reducing drag
    • Reducing CO2 pollution and noise

Background and objectives

  • From high speed aeroacoustic noise > engine noise
    • Penetration of the vehicle -> vortex ->mechanical effort on the windows
    • Subject of thesis on fluctuating pressure


In order to analyze the measurement generated by the test campaign, the engineers at PSA introduced the following process:

  • Data acquisition (30 GB per test campaign)
  • Reading data
  • Fragmented reading of ASCII file because of the large file size
  • Writing and formatting values in the same matrix (50MB)
  • Commuting into spectral data (Fourier transform)
  • Grid definition
  • Corrextion matrix
  • Display