基于轴系刚度计算分析水泵轴系的振动

发布时间：2018-07-07 18:29

本文选题：水泵机组 + 轴系振动　；参考：《排灌机械工程学报》2017年07期

【摘要】：为研究水泵机组轴系支撑刚度与轴系振动之间的关联机理,基于立式水泵机组集中参数模型,提出了水泵机组轴系支撑刚度的计算理论和方法.建立水泵机组电动机转子和水泵转轮形心轨迹运动方程,利用转子和转轮摆度比值关系实现运动方程中耦合刚度项的解耦,结合水泵无水启动的特殊运行条件简化附加外力,进而获得转子和定子形心轨迹运动方程的解析表达式.利用某泵站2台机组的无水启动摆度测试数据,采用多项式拟合方法计算轴系摆度形态,间接得到转子和定子的摆度数据、提取电动机转子附加外力,对计算中的相关问题进行了详细说明.基于2台水泵机组电动机转子和水泵转轮摆度数据计算机组轴承刚度,进行对比分析.结果表明:轴系摆度较大的水泵机组其支撑刚度小于正常机组的刚度.所提出的刚度计算对比方法,可从机组振动的诸多诱因中辨别出刚度影响因素,从而对泵站多机系统中个别机组振动较大情况下的振动进行识别和分析,具有一定的工程参考价值.
[Abstract]:In order to study the correlation mechanism between shaft support stiffness and shaft vibration of water pump unit, based on the centralized parameter model of vertical pump unit, the calculation theory and method of supporting stiffness of water pump unit shaft system are put forward. The motion equation of the center of motion of motor rotor and pump runner of pump unit is established. The coupling stiffness term in the motion equation is decoupled by using the ratio of rotor and runner pendulum, and the additional external force is simplified according to the special operating conditions of water pump start-up. Then the analytic expression of the motion equation of the rotor and stator center-locus is obtained. Based on the test data of water free starting swing of two units in a pump station, the pendulum shape of shafting system is calculated by polynomial fitting method, and the pendulum data of rotor and stator are obtained indirectly, and the additional external force of motor rotor is extracted. The related problems in the calculation are explained in detail. Based on the data of rotor and pump runner pendulum of two water pump units, the bearing stiffness of computer group is compared and analyzed. The results show that the supporting stiffness of the pump unit with larger shafting degree is less than that of the normal unit. The stiffness calculation and contrast method proposed can distinguish the factors of stiffness influence from many inducements of unit vibration, and then identify and analyze the vibration of individual units in multi-machine system of pump station under the condition of larger vibration. It has certain engineering reference value.
【作者单位】：云南省水利水电投资有限公司;云南水投牛栏江滇池补水工程有限公司;
【分类号】：TH38

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