Methods for Resolving Fan/Motor Vibration Problems in Air-Conditioning Units: Part I-Analytical Models for Identifying Vibration Modes Excited by Fan Impeller Unbalance (same as 4116)
空调机组风机/电机振动问题的解决方法:第一部分——识别风机叶轮不平衡激发振动模式的分析模型(与4116相同)
Analytical models have been developed that can be used to investigate the vibration modes that exist in small air-conditioning units and to obtain a clearer understanding of the influence of gyroscopic effects on these vibration modes. Techniques have been developed that can be used to determine the values of the mass and stiffness coefficients in the analytical models from measured data. The analytical model that incorporated the effects of the gyroscopic moment associated with the fan impeller indicated the gyroscopic moment resulted in forward and backward fan impeller whirling modes. These modes were associated with each of the rocking and swaying vibration modes that existed in the two air-conditioning units examined during this project. The correlation between the measured and calculated system resonance frequencies associated with specific vibration modes was very good.Units: SI