Accession Number : ADD015598

Title :   Sound Absorbing Muffler.

Descriptive Note : Patent, Filed 28 Mar 91, patented 6 Oct 92,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Reitz, Ronald P

Report Date : 06 Oct 1992

Pagination or Media Count : 5

Abstract : A sound absorbing muffler construction is provided. The muffler includes a gas conduit having an unobstructed gas flow path and a plurality of perforations passing through its walls along a portion thereof. A sound attenuator body encases the perforated portion of the gas conduit such that a sound absorbing space is formed between the outer wall of the gas conduit and the inner wall of the sound attenuator body. A plurality of parabolically shaped baffles are located in the sound absorbing space. Each baffle is radically disposed and axially extended along the direction of the gas flow. The baffles direction the propagation of acoustic energy entering the sound absorbing space such that the energy traverses a substantially longer path than if no baffles were present. Thus, the acoustic energy is subject to a greater amount of possible attenuation within the sound absorbing space.

Descriptors :   *MUFFLERS, *PATENTS, ACOUSTICS, ATTENUATION, ATTENUATORS, BAFFLES, BODIES, CONDUITS, ENERGY, FLOW, GAS FLOW, PATHS, PERFORATION, PROPAGATION, SOUND, WALLS

Subject Categories : Surface Transportation and Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE