Sound-absorbing panel
AssigneeLord Corporation
InventorJohn M. Zalas
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Abstract
A non-porous, sound-absorbing panel which can be readily cleaned and which is intended for use in high humidity, sanitary environments. The panel comprises two non-porous membranes or panels bonded to opposite sides of a honeycomb structure. At least one membrane is formed of sound-absorbing material with the membrane natural frequency, the membrane/honeycomb cavity natural frequency and the standing wave natural frequency of the honeycomb cavities being closely matched. In a preferred embodiment of the invention, the membrane comprises a polyurethane panel; while the honeycomb structure is formed from phenolic impregnated paper.
Claims7
A sound-absorbing panel comprising a honeycomb core having cavities formed therein and having bonded to its opposite sides non-porous panels, at least one of said panels which is subjected to acoustic vibrations being formed from a flexible membrane whose natural frequency of vibration is substantially the same as both the natural frequency of vibration of the membrane in combination with a cavity in the honeycomb core and the standing wave natural frequency of the cavity itself.
A sound-absorbing panel comprising a honeycomb core having cavities formed therein and having bonded to its opposite sides non-porous panels, at least one of said panels which is subjected to acoustic vibrations being formed from a flexible membrane which absorbs acoustic vibrations from the hysteretic damping associated with flexing of the membrane itself.
Dependencies are inferred from the claim text.