When the refrigerant quality changes, the far-field sound pressure spectrum does not change much. Generally speaking: when charging R410a refrigerant, its far-field sound pressure is larger. This is because the internal acoustic radiation impedance is related to the density of the refrigerant. The density increases, the equivalent damping increases, the corresponding shell vibration response decreases, and the far-field sound pressure also decreases. Since the density of R410a is smaller than the density of R134a, the far field sound pressure is larger. The far-field sound pressure spectrum when the thickness of the compressor casing changes under the action of internal concentrated load. It can be seen that the thickness of the casing increases from 1mm to 3mm, and the far-field sound pressure peak drops from 96.3dB to 89.3dB, which is 7dB lower. That is to say, the far-field sound pressure of the compressor increases with the increase of the thickness of the casing. decline. Moreover, the number of formants is reduced. The far-field sound pressure spectrum of the shell structure with different thickness shells shows the far-field sound pressure spectrum of the compressor when the compressor shell is damped under the internal concentrated load. It can be seen that as the structural damping increases, the peak in the sound pressure spectrum is effectively reduced. Increasing structural damping is an effective way to reduce compressor noise. The loss factor of ordinary steel plates is about 10-4, and the loss factor of composite vibration-damping steel plates can be as high as 0.2. Replacing ordinary steel plates with composite vibration-damping steel plates is a method that can be considered to control compressor noise. As the radius of the compressor casing increases, the far-field sound pressure increases correspondingly, especially the number of formants in the response spectrum increases. This is because the radius of the casing increases and the radiation area increases; and the rigidity of the casing is weakened. The number of formants increases. The low frequency noise of the compressor, the low frequency vibration is closely related to the noise of the refrigerator, and the size of the movement is reduced, which is very beneficial for controlling the noise of the refrigerator. As the compressor casing radius increases, the compressor far-field sound pressure increases.
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March 16, 2023