Vibro-acoustic simulation of a car window

Christophe Barras

Waist seals and glass run channel are used for sealing purposes of automotive opening windows. These seals also contribute in the acoustic performance of the system specifically in the 3kHz frequency band known as the coincidence frequency. In this paper, we present the simulation of the acoustic transparency of a car window with seals around. In a first stage, the mounting of the seals around the windows is simulated by mean of a 2D non linear static analysis in order to get the deformed and pre-stressed state of the seal. In a second stage, a 3D mesh of the vibro-acoustic model is built. It is composed of the 600x600x4mm glass surrounded by the seals. All components are meshed with volumic elements. A thickness of 10 cm air behind the glass is also meshed in order to get the radiated acoustic power at this distance allowing experimental-simulation comparisons. Infinite acoustic elements are finally added to simulate an infinite space. The window is excited by a diffused field. The acoustic transparency curves are presented up to 5200Hz. Comparisons with tests show a good correlation and give confidence in the vibro-acoustic model for predictive purposes.

Mots clés: seal; transparency; simulation; window

Domaines: Acoustique [physics.class-ph]

Christophe Barras. Vibro-acoustic simulation of a car window. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810759⟩