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Windshields With New PVB Interlayer for Vehicle Interior Noise Reduction and Sound Quality Improvement
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 05, 2003 by SAE International in United States
Annotation ability available
Noise transmission through automotive windshields is the subject of extensive laboratory acoustic and full scale high-speed track NVH evaluation. Standard windshields transmit structure-borne noise through resonances at low frequencies, and wind noise and airborne noise due to coincident effect at high frequencies. Approaches to enhance windshields NVH performance and to improve vehicle interior noise quality are explored. The study shows that the most effective approach is to design a new interlayer for windshields. This leads to the development of an acoustic grade PVB interlayer.
To quantify the noise reduction by windshields with the new PVB interlayer, Solutia commissioned NVH testing of the windshields installed on cars, comparing these with factory-equipped standard windshields. Dynamic responses of the windshields were studied in laboratory on a dynamometer and resulting frequency response functions measured. A considerably high damping of resonant vibrations and significant reduction of structure-borne noise were noted. Further studies on the windshields for enhanced noise reduction, in particular wind and road noise, were conducted with several vehicles on high-speed test tracks. Test results show that the use of the windshields with new PVB interlayer results in 2 - 6 dB reduction in the cabin noise in high frequency range and up to 2 - 3 dB reduction in low to mid frequency range. Both subjective and objective results indicate that these windshields can greatly improve the vehicle wind noise and road noise performance and noise quality within the cabin, and result in the quieter passenger compartment.
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CitationLu, J., Pyper, J., Weber, R., and Fisk, J., "Windshields With New PVB Interlayer for Vehicle Interior Noise Reduction and Sound Quality Improvement," SAE Technical Paper 2003-01-1587, 2003, https://doi.org/10.4271/2003-01-1587.
SAE 2003 Transactions Journal of Passenger Cars - Mechanical Systems
Number: V112-6 ; Published: 2004-09-15
Number: V112-6 ; Published: 2004-09-15
- Callister J. R., et al. Aerodynamic and Acoustic Testing of Automobile Side Windows, SAE NVH Conference, 1996, paper No. 960902.
- Lu J., Designing PVB Interlayer for Laminated Glass with Enhanced Sound Reduction, International Noise Control Conference, Internoise 2002, Dearborn, 2002. INCE paper No. IN02-581.
- Lu J., Passenger Vehicle Interior Noise Reduction by Laminated Side Glass. International Noise Control Conference, Internoise 2002, Dearborn, 2002. INCE paper No. IN02-582.
- Pyper J. L., Use of PVB in Laminated Side Glass for Passenger Vehicle Interior Noise Reduction. International Body and Engineering Conference, Detroit, 2000, SAE paper No. 2000-01-2728.
- The measurement of Sound Transmission Loss of glass and glass product follows ASTM E-90. The test panel temperature is controlled at 20°C unless otherwise noted. The panel size is 47-cm × 74-cm.
- Beranek L. L., “Noise and Vibration Control Engineering”, John Wiley & Sons, Inc., 1992.
- The lowest frequency at which the coincident occurs is called the critical frequency. It depends on surface density (ρs) and bending stiffness (B) of glass and can be calculated with the equation: , where c = sound speed in air. In case of monolithic glass, , where h = thickness in millimeter.
- Acoustic data were recorded using a binaural head. Results were gathered for both the right and left ear of the binaural head, seated in the front passenger seat. In this paper, the headspace sound pressure level was the average of both the right and left ear responses.