FIELD: transport.
SUBSTANCE: truck body channels, designed to heat carried cargo, make the exhaust system muffler. To this end, natural frequencies of the said channels acoustic oscillations are determined and exhaust gas flow noise nearby channels end in road tests. Simultaneously, noise is recorded, recorded noise spectrum processing is effected and spectrum frequencies are compared to aforesaid natural frequencies of the channels acoustic oscillations. Further on, gas flow noise spectral components, that feature noise pressure maximum amplitudes, are isolated. Sound pressure noise crest zones are determined for the given frequencies in the said channels to sound absorbing devices to be mounted in the said crest zones.
EFFECT: truck body channels, designed to heat carried cargo, double for exhaust system muffler.
1 dwg
