Tunable sandwich-structured acoustic barriers
In one embodiment, provided is a sound attenuating barrier having a core structure between face sheets with a mass attached to at least one face sheet, and having a spatially varied stiffness distribution and/or a spatially varied density. The sound attenuating barrier may include at least one face sheet and/or core having a spatially varied stiffness distribution and/or a spatially varied mass distribution. In one embodiment, a sound attenuating barrier is provided having a core structure between face sheets with a mass structure attached to at least one face sheet, with the core/and or face sheet(s) being constructed to design an effective vibration length as well as enable a variable local stiffness and mass across the sound attenuating barrier such that the sandwich structure provides variable resonance frequency responses and broadband coverage.
HRL Laboratories, LLC
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G10K G10K
inventional inventional
Alan J. William Adour V. Chia-Ming Tobias A. Geoffrey P.
Jacobsen Carter Kabakian Chang Schaedler McKnight