FIELD: mechanical engineering.
SUBSTANCE: invention relates to transportation equipment field and can be used for noise reduction of exhaust system of internal combustion engine. Method is that it is installed acoustic resonator with changable resonance frequency before muffler. Preliminary it is received noise spectrum inside the pipe and specified spectral frequencies of exhausts follow with increased noise levels, and resonance frequency of acoustic resonator during the engine operation at any revolutions is synchronously adjusted on follow harmonic frequency of exhausts with increased noise levels.
EFFECT: method usage provides to reduce noise of exhaust without increasing of hydraulic friction of exhaust system.
2 dwg
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