초록 ▼

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 p

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.

대표청구항 ▼

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 pluralit

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.