Acoustically Absorbing Lightweight Thermoplastic Honeycomb Panels

Paper #:
  • 2017-01-1813

Published:
  • 2017-06-05
Abstract:
The aerospace industry has employed sandwich composite panels (stiff skins and lightweight cores) for over fifty years. It is a very efficient structure for rigidity per unit weight. 3M has developed novel thermoplastic composite panels that may be heated and shaped by compression molding or thermoforming with cycle time commensurate with automotive manufacturing lines build rates. These panels are also readily recycled at the end of their service life. As vehicles become lighter to meet carbon dioxide emission targets, it becomes more challenging to maintain the same level of quietness in the vehicle interior. Panels with interconnected honeycomb cells and perforations in one skin have been developed to absorb specific noise frequencies. The absorption results from a combination of Helmholtz resonators and quarter wave destruction interference effects. Computer modeling was used to design panels that absorb one of the problem frequency ranges (800-1250 Hz), caused by tires on the roadway. This was achieved in thin (7-8 mm) panels of low density (0.25-0.35 g/cc). Acoustic absorption experimental results, the mechanical performance of these panels, and examples of thermoformed parts will be presented.
Also in:
  • SAE International Journal of Vehicle Dynamics, Stability, and NVH - V126-10
  • SAE International Journal of Vehicle Dynamics, Stability, and NVH - V126-10EJ
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