Acoustical panel
AssigneeAlphadyne, Inc.
InventorLawrence F. Hansen
Life of this patent
Estimating the term…
Abstract
An acoustical panel for reducing acoustic noise is disclosed. The panel is comprised of a corrugated sheet of material. The sheet of material has a generally parabolic-sinusoidal configuration forming a plurality of corrugations. The corrugations extend in a first direction and form a plurality of peaks and valleys. At least one side of the panel has a surface adapted to face a source of acoustical noise. The surface acoustically diffuses acoustic waves striking the surface and causes acoustic wave interference to occur. The acoustic panel has a transaxial stiffness-compliance such that the panel is permitted to pump when low frequency acoustic energy is applied to the panel for the purpose of dissipating acoustic energy.
Claims23
An acoustic panel for reducing acoustic noise comprising:
- means for causing acoustic wave interference of the acoustic noise to occur including a corrugated sheet having a wall of generally parabolic sinusoidal configuration made up of a plurality of curvilinear sections interconnected by a plurality of linear sections to form a plurality of corrugations wherein given sound waves over a selected frequency spectrum striking said wall are segregated into their respective frequency components and are reflected from said wall and phase shifted to meet a complementing frequency component to yield a total phase shift of approximately one hundred and eighty degrees;
- said corrugated sheet being bounded by a plurality of edges and having a first dimension generally parallel to the corrugations and a second dimension generally perpendicular to the first dimension;
- and
- means connected to said edges extending along said second dimension for enabling said corrugated sheet to dissipate acoustic energy by pumping when selected low frequency acoustic energy is applied to the corrugated sheet, said means including a flange member attached to at least one of said last-mentioned edges, said flange member having selected thickness and width to establish the transaxial stiffness-compliance of said panel such that said panel pumps when acoustic energy below approximately 160 Hertz is applied to the wall of said panel.
An acoustic panel for reducing acoustic noise comprising:
- a corrugated integral sheet of acoustically hard material having a generally parabolic-sinusoidal configuration made up of a plurality of curvilinear sections interconnected by a plurality of linear sections to form a plurality of corrugations, at least 50% of said corrugations being formed of said curvilinear sections;
- each curvilinear section having a first and a second end each of which joins with one of said linear sections, a first tangent line extending from said first end and a second tangent line extending from said second end intersecting to form an included angle in the range of substantially 55.degree. to 70.degree. to maximize the acoustic noise reduction within a selected frequency range;
- said corrugations extending in a first direction and forming a plurality of peaks and valleys;
- at least one side of said panel having a surface adapted to face a source of acoustical noise;
- said surface forming means for acoustically diffusing acoustic waves striking said surface and for causing acoustic wave interference to occur within a selected frequency range;
- and
- said acoustic panel having a trans-axial stiffness-compliance to enable said panel to pump when low frequency acoustic energy is applied to the panel whereby acoustic energy is dissipated.
An acoustical panel for reducing acoustic noise comprising:
- a corrugated sheet of material having a generally parabolic-sinusoidal configuration defined by a plurality of curvilinear sections each of which has a radius of curvature with its center disposed a distance away from a plane passing medially of opposing curvilinear sections and having an angular extent of between approximately 110.degree. and 125.degree. interconnected by a plurality of linear sections to form a plurality of corrugations;
- said corrugations extending in a first direction and forming a plurality of peaks and valleys;
- at least one side of said panel having a surface defined by the parabolic-sinusoidal configuration and adapted to face a source of acoustic noise;
- said surface forming a means for acoustically diffusing acoustic waves striking said surface and for causing acoustic wave interference to occur in a selected band of frequencies.
Dependencies are inferred from the claim text.