Prediction of Interior Noise in a Sedan Due to Exterior Flow

Siemens Experimenter Siemens Experimenter
Siemens Experimenter

Prediction of Interior Noise in a Sedan Due to Exterior Flow

 

Aero-vibro-acoustic prediction of interior noise associated with exterior flow requires accurate predictions of both fluctuating surface pressures across the exterior of a vehicle and efficient models of the vibro-acoustic transmission of these surface pressures to the interior of a vehicle. The simulation strategy used in this paper combines both CFD and vibro-acoustic methods. An accurate excitation field (which accounts for both hydrodynamic and acoustic pressure fluctuations) is calculated with a hybrid CAA approach based on an incompressible unsteady flow field with an additional acoustic wave equation. To obtain the interior noise level at the driver's ears a vibro-acoustic model is used to calculate the response of the structure and interior cavities. The aero-vibro-acoustic simulation strategy is demonstrated for a Mercedes-Benz S-class and the predictions are compared to experimental wind tunnel measurements.

 

Publisher:

  • SAE

Author(s):

  • Alexander Schnell
  • Vincent Cotoni

Author's company:

  • Daimler AG
  • CD-adapco

Industry(ies):

  • Automotive

Product(s):

  • Simcenter STAR-CCM+

Date:

  • June 15, 2015

Link:

http://papers.sae.org/2015-01-2331/