Acoustic protective glazing for a vehicle
AssigneeSaint-Gobain Vitrage International
InventorsMarc Rehfeld, Michel Canaud
Life of this patent
Estimating the term…
Abstract
An acoustic glazing intended for land transportation vehicles and including first and second glass sheets separated by an interlayer region, wherein the acoustic transmission loss differs at most by 5 dB from a figure increasing of 9 dB per octave from 800 to 2000 Hz and of 3 dB per octave above that. As examples, double glazings or laminated glazings are presented featuring an interlayer with a pronounced damping. The acoustic glazing will then operate to effectively eliminate aerodynamic noises in moving vehicles.
Claims22
An acoustic protective glazing for a vehicle, comprising:
- a first glass sheet;
- a second glass sheet;
- said first and second glass sheets being positioned so as to form an interlayer region between said first and second glass sheets;
- wherein at least one of the thickness of at least one of said glass sheets and the composition and dimensions of said interlayer region are chosen such that said protective glazing attenuates frequencies higher than 800 Hz and has an acoustic transmission loss which does not differ for any frequency by more than 5 decibels from an increasing reference figure of 9 dB per octave up to 2000 Hz and of 3 dB per octave at higher frequencies, wherein said first and second glass sheets comprise first and second monolithic glass sheets whose thickness differs by more than 20%, said first and second glass sheets being separated by an air space forming said interlayer region.
An acoustic protective glazing for a vehicle, comprising:
- a first glass sheet;
- a second glass sheet;
- said first and second glass sheets being positioned so as to form an interlayer region between said first and second glass sheets;
- wherein at least one of the thickness of at least one of said glass sheets and the composition and dimensions of said interlayer region are chosen such that said protective glazing attenuates frequencies higher than 800 Hz and has an acoustic transmission loss which does not differ for any frequency by more than 5 decibels from an increasing reference figure of 9 dB per octave up to 2000 Hz and of 3 dB per octave at higher frequencies, and wherein the thickness of at least one of said glass sheets and the composition and dimensions of said interlayer region are chosen such that the standard deviation .sigma. of the differences of the acoustic attenuation factor in relation to the reference figure remains less than 4 dB, and wherein said first and second glass sheets comprise first and second monolithic glass sheets whose thicknesses differ by more than 20%, said first and second glass sheets being separated by an air space forming said interlayer region.
Dependencies are inferred from the claim text.