Safety analysis for torsional vibration during variable frequency conversion of feed water pump

YANG Kun; ZHAO Pengcheng; GU Yujiong; NIE Shenbin; HE Qingqiong

doi:10.19666/j.rlfd.201709170

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Safety analysis for torsional vibration during variable frequency conversion of feed water pump

更新时间：2025-09-28

- Safety analysis for torsional vibration during variable frequency conversion of feed water pump
- Thermal Power Generation Vol. 47, Issue 5, Pages: 118-123(2018)
- 作者机构：
  
  1. 华北电力大学能源动力与机械工程学院
  2. 苏州热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201709170
  CLC： TH312
- Published Online：03 May 2018，
  
  Published：2018
- 稿件说明：
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YANG Kun, ZHAO Pengcheng, GU Yujiong, et al. Safety analysis for torsional vibration during variable frequency conversion of feed water pump[J]. Thermal power generation, 2018, 47(5): 118-123.
DOI：

YANG Kun, ZHAO Pengcheng, GU Yujiong, et al. Safety analysis for torsional vibration during variable frequency conversion of feed water pump[J]. Thermal power generation, 2018, 47(5): 118-123. DOI： 10.19666/j.rlfd.201709170.

摘要

针对给水泵变频改造可能出现的振动过大、轴系断裂等安全性问题

建立了给水泵转子-齿轮-前置泵转子轴系的多段集中质量模型

并利用ANSYS建立轴系有限元模型

分别利用传递矩阵法和有限元法计算轴系的扭振固有频率和振型;根据计算结果确定轴系的危险截面;利用MATLAB/Simulink建立详细的变频调速系统模型

并对高压变频器输出谐波进行仿真

作为水泵轴系扭振故障的扰动源;最后利用建立的有限元模型

计算由于变频器输出谐波造成的轴系危险截面扭矩响应

并结合本文拟合的危险截面S-N曲线得到轴系疲劳寿命损耗值。结果表明:采用齿轮联接方案时轴系的危险截面分别位于给水泵联轴器前端和前置泵轴叶轮前端位置

由于变频器谐波造成的轴系扭应力较小

分别为5 MPa和1 MPa

远低于危险截面部位的疲劳极限50 MPa

不会使转子出现寿命损耗。

Abstract

To solve the safety problems such as excessive vibration and shaft fault occurred during variable frequency transformation of electric feed pump

the multi-lumped masses model of the pump rotor-gear-front pump rotor was established

and the finite element model was established by ANSYS. The torsional vibration frequencies and modes of the shaft system were calculated by using the transfer matrix method and the finite element method respectively. According to the calculation results

the dangerous sections of the shafting system were determined. The detailed frequency conversion speed control system model was built up by using the MATLAB/Simulink platform

and the output harmonics of the high voltage inverter were simulated as the faulty source of the fault. Finally

the finite element model was applied to calculate the torque response of the dangerous sections due to the output harmonics of the inverter

and combining with the S-N curve

the fatigue life loss of the shaft system was obtained. The results show that

the dangerous cross section of the shafting system locates at the front end of the feed pump coupling and the front end position of the front pump shaft

respectively. The torsional stress of the shaft caused by the harmonic of the inverter is 5 MPa and 1 MPa

which is far away lower than the fatigue limit o f50 MPa at the dangerous section

so life loss of the rotor will not occur.

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