Piping vibration which is mainly caused by the torsional vibration of rotary compressor can be a major noise source of air-conditioner. Especially, the tangential vibration of rotary compressor which is due to the torsional vibration is much higher than the radial vibration or the vertical vibration of compressor. A study as to how the tangential vibration of rotary compressor is related with the design parameters of rotary compressor is conducted by dimensional analysis along with experiment. According to this study, the tangential vibration of rotary compressors is closely related with the inertia moment of compressor as well as design parameters that determine the displacement. They are cylinder height, roller outside diameter and shaft eccentricity. Therefore, when rotary compressor is newly designed for capacity extension or new refrigerant application such as R410A, the design parameters should properly be selected for minimum tangential vibration.
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