Abstract
The main automobile aerodynamic noise sources radiating into the environment are internal combustion engine gas-exchange systems (intake and exhaust). Practical possibilities of active noise control unit applications for automobile gas-exchange system low-frequency noise reduction are discussed. Existing technical constructions of active noise control units (including those patented by author) for automobile intake and exhaust noise reduction are concerned. New construction of a unit is proposed. Its peculiarity is joint intake and exhaust noise reduction possibility. The signal of engine rotation frequency pick-up is input into the control system through the low-pass filter and transducer and then transmitted by the loudspeakers through the special waveguides into the zones of compensation near the intake and exhaust pipe open ends. Throttle opening angle is accounted for. Calculative results show the efficiency of such a construction operation.
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