Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1996-08-05
1999-02-16
Dang, Khanh
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181279, 181225, F01N 116
Patent
active
058723420
ABSTRACT:
A free rotor is mounted to spin freely in a conduit network that is acoustically coupled to a noise source through a working fluid that flows through the conduit network. The free rotor muffles the acoustic perturbations travelling through the conduit network, thus effectively muffling the noise source. The network has at least one extent of conduit and within the extent of conduit. The free rotor is typically mounted with its axis of rotation parallel to the direction of flow of the working fluid. Additional free muffling rotors may be provided, either counter rotating or rotating in the same direction. If adjacent free rotors rotate in the same direction, it is beneficial to provide a stationary blade row between them. The multiple free rotors may be mounted on the same spindle, or mounted on independent spindles. The parameters of the free rotor are typically sized relative to the elements and environment of the conduit network such that: ##EQU1## where J is the free rotor rotational inertia, R is the mean radius of the free rotor, u.sub.x is the axial velocity of fluid in the conduit, f is the lowest frequency of any acoustic vibration in the conduit to be muffled .rho. is the density of the working fluid, where .pi. is the ratio of the circumference of a circle to its diameter and A is the cross-sectional flow area of the free rotor.
REFERENCES:
patent: 1318996 (1919-10-01), Hauman
patent: 2076827 (1937-04-01), Ross
patent: 2172713 (1939-09-01), Rutherford
patent: 3000465 (1961-09-01), Bruno
patent: 3248758 (1966-05-01), Mockridge et al.
patent: 3856333 (1974-12-01), Cox
patent: 5129792 (1992-07-01), Abousabha
Dang Khanh
Massachusetts Institute of Technology
Weissburg Steven J.
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