非对称支撑刚度立式泵的动力特性分析及多矢量加权优化方法的应用

Analysis of Dynamic Characteristics of Vertical Pump with Asymmetrical Support Stiffness and Application of Multi-vector Weighted Optimization Method

针对660MW发电机组中立式水泵变频改造中出现的异常振动现象进行分析和治理。由于凝结水泵的电机壳体一侧存在观察窗,导致圆周方向的支撑刚度不对称。在交叉刚度的作用下,凝泵的变频运行区间内存在2个临界转速区且振动相互耦合。对于这类支撑刚度不对称的系统,提出了一种加权多矢量优化方法。对系统的原始振动情况进行分析处理,通过矢量优化方法计算出当矢量和最小时的最佳动平衡加重方案后,根据实际运行需求采用加权系数进行优化,达到良好的减振效果。给出了多矢量加权优化的算法,并以某台660MW的汽轮发电机组配套凝泵实际振动数据为例进行了分析。

The abnormal vibration phenomenon of vertical water pump in 660 MW generator set is analyzed and treated in this paper.Due to the observation window on the one side of the motor housing of the condensate pump,the stiffness of the support in the circumferential direction is not symmetrical.Under the effect of cross stiffness,there are two critical speed regions in the variable frequency operation region of the condensate pump,and the vibration is coupled with each other.A weighted multi-vector optimization method is proposed for this kind of system with asymmetrical bracing stiffness.The original vibration of the system is analyzed,and the optimal dynamic balance weighting scheme is calculated by the vector optimization method when the vector sum is the minimum,and then the weighted coefficient is used to optimize according to the actual operation requirements to achieve good vibration reduction effect.In this paper,a multi-vector weighted optimization algorithm is presented,and the actual vibration data of a 660 MW turbine-generator set matching condensate pump is analyzed.