Abstract
Total dimensions of the silencer of exhaust gas noise usually are in finite relations with the sound wavelength, corresponding to the engine assigned frequency. A silencer design independent of assigned frequency is suggested. An ultrasound sirenlike flux cyclical switch ensures the N-cascade up-conversion of the pulsing frequency into the ultrasound frequency range, where the small-dimensional sound absorbers may be used. N cascades ensure low-frequency pulsing amplitude decreasing by 2N times. The output cascade tube diameter must be more than the input tube diameter by √2 times to save the average in time total flux cross section. This circumstance is the main factor that limits a decrease in the size of the silencer dimensions. The results of experimental investigations of the one-cascade system are presented.
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