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.

Challenge

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

Solution

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

Results