Cellular sound absorptive structure

Details Cellular sound absorptive structure Cellular sound absorptive structure

G - Physics

10

K

181/15

G10K 11/04 (2006.01) B32B 3/12 (2006.01) G10K 11/172 (2006.01)

Patent

CA 1051351

A B S T R A C T A sound absorbing structure comprising an orthogonal array of like cells, wherein each cell com- prises a bundle of parallel, terminated, acoustical waveguides. The bundle of waveguides is cut obliquely so that individual waveguides vary substantially in length along the cut. The total admittance of acoustical energy to each absorber cell is the sum of the individual admittances of the waveguides comprising the bundle. The cell (unit bundle) structure is repeated throughout the array. A sound wave arriving at the open end of any cell in the array will encounter at least one waveguide which is effectively resonant at the frequency of the arriving wave. The admittance for the resonant waveguide will be large; the rest of the waveguides will not be resonant to that frequency (admittance is small). The local resonance serves to absorb acoustic energy at its frequency from an area up to about .lambda.2/.pi., where is the wavelength of the sound to be absorbed. Operation of the structure is rela- tively independent of the materials from which it is made and is particularly suitable for sound attentuation in jet engines, high-velocity gas flow ducts, and other applications having similar adverse environmental conditions.

223651

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