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现行 SF-98-25-2(RP-685)
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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)
已开发出分析模型,可用于研究小型空调机组中存在的振动模式,并更清楚地了解陀螺效应对这些振动模式的影响。已开发出可用于根据测量数据确定分析模型中质量和刚度系数值的技术。考虑了与风机叶轮相关的陀螺力矩影响的分析模型表明,陀螺力矩导致了风机叶轮的前后旋转模式。 这些模式与本项目期间检查的两台空调机组中存在的摇摆和摇摆振动模式有关。与特定振动模式相关的测量和计算系统共振频率之间的相关性非常好。单位:SICitation:研讨会,ASHRAE交易,1998年,第104卷,pt。1A,旧金山
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
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