摘要
将立式水泵机组轴系结构简化为三支承二圆盘的集中参数模型,建立了电动机转子和水泵转轮形心轨迹的运动方程,进而获得稳态下形心轨迹的解析表达式.利用水泵机组无水启动试验的特殊性和近似处理,给出了电动机转子和水泵转轮固有频率和阻尼比的计算方法.以某泵站无水启动的轴系摆度实测数据为例,根据轴系几何结构拟合轴系摆度形态,结合多转速下的测试数据,采用多项式拟合方法获得转子和转轮摆度数据.利用拟合得到的转子和转轮摆度数据计算水泵机组轴系特征参数,并对计算中的相关问题进行了分析说明.采用文中所提出的方法,可计算得到水泵转轮和电动机转子的固有频率转速、阻尼比和质量偏心等振动特征参数,且计算结果具有一定的数值稳定性.由于采用实测数据进行计算,所获得的振动特征参数包含了安装、调试等不确定性因素的影响,对于已安装运行的水泵机组振动研究具有参考价值.
Firstly,the shafting of vertical pumping units is simplified as a geometric model with three bearings and two discs. Motion equations of the central trajectory for electromotor rotor and pump runner are established. Then,the analytical expressions of central trajectory under steady state are obtained. Secondly,according to particularity of no-water start test and approximate treatment,the calculation methods of the natural frequency and damping ratio for electromotor rotor and pump runner are proposed based on some of approximate assumptions. Using test data under no-water start test in a pump station,one fits to obtain the throw shape of shafting referring to geometric structure of shafting,and obtain throw data of runner and rotor by using the polynomial fitting method. Characteristic parameters of water pump units can be calculated by using throw data of runner and rotor,in which detailed calculation steps and explanation are given. The proposed method can calculate characteristic parame-ters of shafting vibration,such as natural frequency,damping ratio and mass eccentricity,and the calculation results have a certain numerical stability. Owning to the test data used in calculation,the obtained characteristic parameters of shafting vibration include uncertainty factors produced by install and debug. The results are of reference value to the research into vibration characteristic of water pump units installed under operation.
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2017年第8期659-665,共7页
Journal of Drainage and Irrigation Machinery Engineering
关键词
水泵轴系
特征参数
无水启动
形心轨迹
water pump shafting
characteristic parameter
no-water start
central trajectory
作者简介
李耀辉（1960-），男，云南德宏人，副总工程师（2755193115@qq．com），主要从事水力机械故障分析研究．
朱双良（1971-），男，云南曲靖人，总工程师（914548058@qq．com），主要从事水力机械故障分析研究．
