Vacuum pump exhaust muffler

Details Vacuum pump exhaust muffler Vacuum pump exhaust muffler

1979-01-31

1981-04-28

Miller, Jr., George H.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181273, F01N 102, F01N 110

Patent

active

042639816

ABSTRACT:
A muffler for use in conjunction with a high intensity, low frequency noise-propagating open pipeline is disclosed. The muffler features an acoustically lined expansion chamber in tandem with a reasonator chamber. The length of the expansion chamber is approximately 25 percent of the wavelength to be attenuated. An exit tube, which passes through the resonator chamber to lead from the expansion chamber to the muffler outlet, is partially perforated with the perforations being restricted to at most the 50 percent of the exit tube closer to the muffler outlet. Audible noise which is emitted by the open pipeline is reduced by up to 30 dB and 11 .DELTA. dB(A) and brought to within acceptable levels.

REFERENCES:
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patent: 3534828 (1970-10-01), Iver
patent: 3581842 (1971-06-01), Hall
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patent: 4113051 (1978-09-01), Moller
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Report 1192, "Theoretical and Experimental Investigation Of Mufflers With Comments on Engine-Exhaust Muffler Design", by D. D. Davis, Jr., et al., Langley Aeronautical Laboratory, pp. 4, 22, 23 and 45.

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