Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1976-06-22
1978-08-29
Tomsky, Stephen J.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181250, 181206, 181256, 181282, 181296, F01N 104, F01N 100, F01N 716
Patent
active
041097521
ABSTRACT:
A muffler incorporates a tubular shell that has an acoustically reflective interior circumferential surface. In successive sections taken transversely through the shell, the acoustically reflective surface has at least a portion of its circumference shaped to define at least part of an ellipse or a parabola. Between an inlet into and an outlet from the shell, a fluid flow path extends along an axis lengthwise through the shell. A sound absorptive treatment is disposed along a second axis extending lengthwise through the shell. The treatment is spaced from but communicates with the fluid flow path. At least one of the two axes is defined by corresponding focal points of successive transverse sections taken through the curvilinear portion of the circumference of the acoustically reflective shell surface. In operation, sound emitted from fluid flowing along the fluid flow path is reflected by the reflective shell surface to the sound absorptive treatment. The muffler thus attenuates sound emitted from the fluid without significantly interfering with the flow of fluid.
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Lord Corporation
Salada Maurice R.
Tomsky Stephen J.
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