Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1995-05-25
1997-01-28
Dang, Khanh
Acoustics
Sound-modifying means
Muffler, fluid conducting type
138121, F01N 708
Patent
active
055979858
ABSTRACT:
A corrugated structure is designed by dividing a given length of a corrugated structure into a number of sections, or corrugations. The length is then divided by the number of sections to obtain a constant value which serves as a reference point for determining the varied pitches of the structure of the present invention. The varying pitch of each section is determined by adding or subtracting a variation value from the constant value to obtain a varying pitch. The variation values, and thus the varying pitches, of the sections of corrugated structure are empirically chosen. Whistles, or pure tones of noise, produced by the flow of a fluid relative to the corrugations are eliminated when the corrugated structure is designed according to three requirements: 1) the total of the pitches of a given section is approximately equal to the length of a given section; 2) no two adjacent sections can have the same pitch; 3) no two variations within a given set of sections can have the same value. A group of varying pitches can itself be repeated in the manufacture of an extended structure. Such a design is particularly useful in blow-molded or injection-molded hoses, where the repetition of the pattern of varying pitches is easily adapted to manufacturing techniques. Such hoses may be used in a variety of applications, including architectural, medical, automotive and aircraft.
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Dear Terrence A.
Ingard Karl U.
Dang Khanh
E. I. Du Pont de Nemours and Company
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