ASHRAE第685-RP号研究项目:解决空调机组风机/电机振动问题的测试和分析方法的目标是开发基本分析模型和实验程序，用于找出由风机叶轮不平衡激发的空调机组风机叶轮、电机和电机支架的振动模式，考虑到旋转风扇叶轮的陀螺效应和电机转矩脉动。该项目调查了四台空调机组。它们被指定为测试单元#1至#4。对于试验装置#1和试验装置#2，考虑到旋转风扇叶轮的陀螺效应，研究了由风扇叶轮不平衡激发的与风扇叶轮、电机和电机安装系统相关的振动问题。从理论和实验上证明，旋转风扇叶轮的陀螺效应对系统的前向振动模态有显著影响。 采用经典方法和能量方法建立了包含旋转风扇叶轮陀螺效应的三维集总参数模型。在经典方法中，旋转风扇叶轮的陀螺效应提供了额外的阻尼矩阵。在能量法中，由于旋转风扇叶轮的陀螺效应，在刚度矩阵中添加了附加项。阻尼矩阵或刚度矩阵中的所有这些附加项表示两个不同平面中运动之间的模态耦合。经典方法的模型和能量方法的模型对前向摇摆模式给出了很好的预测，前向摇摆模式是本研究中最重要的振动模式。前两台机组均进行了非旋转和旋转试验。非旋转试验用于测量与风机叶轮、电机和电机安装系统相关的振动模式，并确定分析模型中使用的参数。 旋转试验用于测量由于旋转风扇叶轮的陀螺效应而产生的振动模式偏移，并确定与正向和反向摇摆模式对应的共振速度。分析模型的结果与非旋转和旋转试验的实验结果非常吻合。对于第二个两个试验装置，即试验装置#3和试验装置#4，研究了与电机转矩脉动激发的电机转子、轴和风扇叶轮扭转振动相关的噪声问题。研究了电机定子和电机安装系统以及风扇叶轮、电机转子和轴组件的扭转频率响应。在识别扭转共振频率的调查中，研究了不同的测试方法。在这项工作中，还研究了固定螺钉拧紧度对有效轴长度和电机转矩脉动的影响。

The objective of the ASHRAE Research Project No. 685-RP: Test and Analysis Methods for Resolving Fan/Motor Vibration Problems in Air-Conditioning Units, is to develop the basic analytical models and experimental procedures that can be used to find the vibration modes associated with fan impeller, motor and motor mount in airconditioning units that are excited by fan impeller unbalance, taking into account the gyroscopic effect of the rotating fan impeller, and motor torque pulsations.Four air-conditioning units were investigated in the project. They were designated as test units #1 to #4.For the test unit #1 and test unit #2, the vibration problems associated with fan impeller, motor and motor mount system that are excited by fan impeller unbalance taking into account the gyroscopic effect of the rotating fan impeller were investigated. It was proved, both theoretically and experimentally, that the gyroscopic effect of the rotating fan impeller did have significant effect on the forward vibration modes of the system. The classical approach and energy approaches were used in the three dimensional lumped parameter model development, in which the gyroscopic effect of rotating fan impeller was included. In the classical approach, the gyroscopic effect of the rotating fan impeller gave an additional damping matrix. In the energy approaches, additional terms were added to the stiffness matrix due to the gyroscopic effect of the rotating fan impeller. All these additional terms, either in the damping matrix or in the stiffness matrix, represent the modal coupling between the motions in the two different planes.The model from classical approach and the model from energy approach gave very good predictions about the forward rocking mode, which is the most important vibration mode in this work. Both non-rotating and rotating tests were conducted in these first two units. The non-rotating tests were used to measure the vibration modes associated with fan impeller, motor and motor mount system and to identify the parameters used in the analytical models. The rotating tests were used to measure the vibration mode shifting due to the gyroscopic effect of the rotating fan impeller and to locate the resonance speeds corresponding to both the forward and backward rocking modes. The results from analytical models agreed very well with the experimental results both for the non-rotating and rotating tests.For the second two test units, test unit #3 and test unit #4, the noise problems associated with torsional vibrations of motor rotor, shaft and fan impeller that are excited by motor torque pulsations were investigated. The torsional frequency responses of both the motor stator and motor mount system and the fan impeller, motor rotor and shaft assembly were studied. Different test methods were studied in the investigations for identifying the torsional resonance frequencies. The effect of the tightness of the set screw on the effective shaft length and the motor torque pulsations were investigeted too in this work.