Assessment of Lightweight Automotive Glass Solutions on Interior Noise Levels & Sound Quality

Paper #:
  • 2017-01-1814

  • 2017-06-05
The automotive industry continues to develop new powertrain and vehicle technologies aimed at reducing overall vehicle level fuel consumption. Specifically, vehicle light weighting is expected to play a key role in helping OEM’s meet fleet CO2 reduction targets for 2025 and beyond. Corning’s Gorilla® Glass Hybrid laminate solution offers more than 30% weight reduction compared to conventional automotive laminate. Additionally, Gorilla Glass Hybrid laminates provide improved toughness, better optics, and enables better vehicle dynamics by lowering the vehicle center of gravity. Although thin glazing offers multiple advantages, glazing weight reduction leads to an increase in transmission of sound through the laminates for certain frequencies. This paper documents a study that uses a systematic test-based approach to understand the sensitivity of interior vehicle noise behavior to changes in acoustic attenuation driven by installation of lightweight glass. Specifically, this study evaluates the influence of a lightweight windshield on wind, road, and powertrain contributions to vehicle interior noise. To facilitate this assessment, operating tests were conducted utilizing variable powertrain loads, vehicle speeds, and road surfaces such that varying balances of powertrain, wind, and road-induced interior vehicle noise could be evaluated. A time-domain noise transfer path analysis (TPA) was conducted, including multiple sources to quantify the contributions of powertrain, wind, and tire-induced noise. Prototype glass treatments were installed, and differences in measured airborne noise transfer functions used to update the TPA model for interior noise prediction. To eliminate the influence of test reproducibility, a consistent set of “source” data was used throughout this study. Based on the results of the iterative TPA analysis, the influence of glass acoustic performance on interior sound was assessed. The use of a time-domain TPA process facilitated both subjective and objective assessment of interior sound quality. The results from this process will be discussed and suitable conclusions drawn, with respect to vehicle-level NVH performance of the Gorilla Glass Hybrid laminate relative to conventional laminate.
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