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With the increased electric vehicle (EV) adoption and the reduced application of the traditional combustion engine, windnoise is becoming the major contributor to the interior noise level in the vehicle. The weakest point for the acoustical insulation of the car body remains the glazing due to its legal requirements of impact resistance and transparency. Moreover, in modern car design the relative glazing surface tends to increase contributing to the interior comfort and an enhanced viewing experience. Larger glass panels however show a larger transparency for environmental noise sources such as wind and passing-by noise. New polymeric interlayers have been developed to remediate this problem. In most cases the application of this PVB (polyvinylbutyral) films tends to be restricted to the laminated windscreen while other glazing surfaces are predominantly tempered glass. In this study, aero-acoustical and vibro-acoustical modelling, using Actran®, have been used as a tool to quantify the relative contribution of each glass panel to the interior noise level in the car. The local turbulence near the glazing positions was computed from a CFD simulation of the air flow over the car’s body. The respective noise sources were derived from the calculated kinetic energy and kinetic energy dissipation using Lighthill’s theorem and the Stochastic Noise Generation and Radiation (SNGR) methodology to determine the relative noise level up to a frequency of 10.000 Hz. The finite element (FE) technique, rather than the statistical energy approach, has permitted to simulate noise levels at specific locations in the cabin’s interior. These methods were used to evaluate the relative effect of different interlayer types in the respective glazing parts (windscreen, sunroof and sidelams) on the acoustical insulation. Specifically for the car model considered, the simulation results have indicated that the transfer path for aero-dynamically induced noise is strongly frequency dependent. In the lower frequency range, noise is predominantly transmitted through the side windows. At the higher frequencies a considerable fraction of the noise is also transferred through the sunroof. The outlined simulation strategy can be further applied to optimize noise insulation performance of the glass configurations.

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Evaluation of the PVB Interlayer Type on the Interior Noise Level Using a Finite Element Approach

  • 会议论文

  • 发表日期：

    2025年

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  • Dan Hodder,
  • Mike Johnson,
  • Pol D’Haene,
  • Viswesh Sujjur Balaramraja

摘要

With the increased electric vehicle (EV) adoption and the reduced application of the traditional combustion engine, windnoise is becoming the major contributor to the interior noise level in the vehicle. The weakest point for the acoustical insulation of the car body remains the glazing due to its legal requirements of impact resistance and transparency. Moreover, in modern car design the relative glazing surface tends to increase contributing to the interior comfort and an enhanced viewing experience. Larger glass panels however show a larger transparency for environmental noise sources such as wind and passing-by noise. New polymeric interlayers have been developed to remediate this problem. In most cases the application of this PVB (polyvinylbutyral) films tends to be restricted to the laminated windscreen while other glazing surfaces are predominantly tempered glass. In this study, aero-acoustical and vibro-acoustical modelling, using Actran®, have been used as a tool to quantify the relative contribution of each glass panel to the interior noise level in the car. The local turbulence near the glazing positions was computed from a CFD simulation of the air flow over the car’s body. The respective noise sources were derived from the calculated kinetic energy and kinetic energy dissipation using Lighthill’s theorem and the Stochastic Noise Generation and Radiation (SNGR) methodology to determine the relative noise level up to a frequency of 10.000 Hz. The finite element (FE) technique, rather than the statistical energy approach, has permitted to simulate noise levels at specific locations in the cabin’s interior. These methods were used to evaluate the relative effect of different interlayer types in the respective glazing parts (windscreen, sunroof and sidelams) on the acoustical insulation. Specifically for the car model considered, the simulation results have indicated that the transfer path for aero-dynamically induced noise is strongly frequency dependent. In the lower frequency range, noise is predominantly transmitted through the side windows. At the higher frequencies a considerable fraction of the noise is also transferred through the sunroof. The outlined simulation strategy can be further applied to optimize noise insulation performance of the glass configurations.