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Active Noise Control of Compressor Noise in an Inverter-Type Air Conditioner

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This paper presents experimental results of active noise control (ANC) for compressor noise suppression in an inverter-type air conditioner, which is kindly offered by TECO Electric & Machinery Co. A microphone for picking up residue noise is installed about 10 centimeters above the compressor and an accelerometer for measuring vibration signal of the compressor for synthesizing the reference signal is attached to the compressor cap. A loudspeaker is mounted at the top right position of the compressor for generating the secondary source for noise attenuation. Three architectures of feedforward, feedback, and hybrid ANC for computing control signals are employed for suppressing compressor noise in the air conditioner. Experimental results show that averaged noise reduction of 2.12dB, 3.48dB, and 3.02dB can be obtained by using the proposed feedforward, feedback, and hybrid control, respectively, in the range of 26-62 rps (revolution per second) of the compressor rotational speed. Furthermore, more than 10dB attenuation at the noise primary frequency is observed for every tested compressor rotational speed, some even to 20dB attenuation for compressor speeds between 35-44rps.

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