Low frequency muffler

Details Low frequency muffler Low frequency muffler

1982-08-09

1985-02-26

Fuller, Benjamin R.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181272, 181273, F01N 102

Patent

active

045013411

ABSTRACT:
A muffler comprises two Helmholtz resonators, one tuned for high frequency and the other for low frequency. There is a resonance of the high frequency resonator volume's compliance and the effective tail pipe gas inertance which produces an undesirable low frequency noise. This is matched by the resonant frequency of the low frequency resonator, and suppressed thereby. A secondary effect to suppress noise at frequencies above said low frequency resonance due to the tailpipe gas inertance increasing linearly with frequency.

REFERENCES:
patent: 2112964 (1938-04-01), MacKenzie
patent: 2191619 (1940-02-01), Muller
patent: 2191620 (1940-02-01), Muller
patent: 3434565 (1969-03-01), Fischer

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