水轮发电机组横/轴有限元振动分析

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (14) : 64-69.

论文

水轮发电机组横/轴有限元振动分析

张雷克1，范宇宏1，张金剑1，马震岳2，王雪妮1

作者信息 +

Finite element analysis on the transversal / axial vibration of a hydraulic generating set

ZHANG Leike1，FAN Yuhong1，ZHANG Jinjian1，MA Zhenyue2，WANG Xueni1

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文章历史 +

摘要

针对机械和电磁故障引起的水轮发电机组轴系振动问题，基于单节点4自由度Euler梁，将轴向位移纳入整体结构建立了单节点5自由度机组转子-轴承系统有限元模型。利用Newmark-β和Newton-Raphson相结合方法对系统进行求解，借助轴心轨迹图分别讨论了是否考虑轴向自由度和轴向电磁力下质量偏心、静偏心对系统横向振动特性的影响。结果表明：轴向自由度的加入对系统运动轨迹形态及大小起到了积极改变作用。轴向电磁力与动、静偏心下不平衡磁拉力形成电磁激励耦联效应，二者共同作用使系统横向运动振幅明显增大。因此，在水轮发电机组轴系建模及分析过程中应充分考虑轴向自由度及相关荷载作用影响。
关键词：水轮发电机组；有限元法；轴向自由度；轴向电磁力；动、静偏心

Abstract

Aiming at the shaft vibration problem of hydraulic generating set caused by mechanical and electromagnetic faults, based on Euler beam with 4 degree of freedom for single node, the finite element model of rotor-bearing system possessing 5 degree of freedom is established by incorporating axial displacement into whole structure.. The system is analyzed by combination of Newmark-β and Newton-Raphson method. With the help of axis trajectory diagram, the effects of mass eccentricity and static eccentricity on lateral vibration characteristics with and without axial degree of freedom, as well as axial electromagnetic force, are discussed respectively. The results show that the addition of axial degree of freedom plays a positive role in changing shape and size of the system trajectory. The coupling effect of electromagnetic excitation is formed between axial electromagnetic force and unbalanced magnetic pull considering both dynamic and static eccentricities, and the amplitude of lateral motion of system is obviously increased due to dual electromagnetic excitation. Therefore, the effects of axial degrees of freedom and related loads should be fully considered in the process of shaft modeling and corresponding analysis for hydraulic generating set.
Key words: hydraulic generating set; finite element method; axial degree of freedom; axial electromagnetic force; dynamic and static eccentricities

导出引用

张雷克1，范宇宏1，张金剑1，马震岳2，王雪妮1. 水轮发电机组横/轴有限元振动分析[J]. 振动与冲击, 2022, 41(14): 64-69

ZHANG Leike1，FAN Yuhong1，ZHANG Jinjian1，MA Zhenyue2，WANG Xueni1. Finite element analysis on the transversal / axial vibration of a hydraulic generating set[J]. Journal of Vibration and Shock, 2022, 41(14): 64-69

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