Vibration Transmission Path Analysis of Auxiliary Steam Turbine-Generator Unit Based on OTPA

LIU Bing; ZHANG Wanfu; ZHAO Qianqian; Lü Xuebin; REN Jie

doi:10.19805/j.cnki.jcspe.2026.240642

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Vibration Transmission Path Analysis of Auxiliary Steam Turbine-Generator Unit Based on OTPA

更新时间：2026-10-10

- Vibration Transmission Path Analysis of Auxiliary Steam Turbine-Generator Unit Based on OTPA
- Chinese Journal of Power Engineering Vol. 46, Issue 1, Pages: 42-50(2026)
- 作者机构：
  
  1. 上海理工大学能源与动力工程学院,上海,200093
  2. 上海市动力工程多相流动与传热重点实验室,上海,200093
  3. 中电建(南京)工程有限公司,江苏,南京,210019
  4. 国网山东省电力公司,山东,济南,250001
  5. 国网山东省电力公司电力科学研究院,山东,济南,250003
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2026.240642
  CLC：
- Online First：15 January 2026，
  
  Published：15 January 2026
- 稿件说明：
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刘兵,张万福,赵乾乾,吕学宾,任杰. 基于OTPA的辅汽轮发电机组振动传递路径分析动力工程学报, 2026, 46(1): 42-50 https://doi.

org/10.19805/j.cnki.jcspe.2026.240642
刘兵,张万福,赵乾乾,吕学宾,任杰. 基于OTPA的辅汽轮发电机组振动传递路径分析动力工程学报, 2026, 46(1): 42-50 https://doi. DOI： 10.19805/j.cnki.jcspe.2026.240642.

org/10.19805/j.cnki.jcspe.2026.240642 DOI：

摘要

针对辅汽轮发电机组振动传递路径不清晰问题

以某高速辅汽轮发电机组为研究对象

建立转子-轴承-定子整机模型

基于工况传递路径分析(operational transfer path analysis

OTPA)方法构建机组振动传递模型

分析机组振动传递规律。首先应用有限元方法获取机组各传递路径频率响应函数

综合考虑转子不平衡、脉动汽流力及不平衡磁拉力等激励源

采用奇异值分解技术对各轴承座处输入信号进行降噪合成

构建各路径输入与输出关系的传递函数矩阵

分析不同路径对定子外壳的振动贡献

明确其主要振动传递路径。结果表明:定子外壳各测点振动主要振动路径来源于辅汽轮机的2个轴承座

特别是发电机侧轴承座的振动贡献量最大。通过优化调整该轴承座结构固有特性与转子不平衡力相位差可以有效降低定子外壳振动

最大振幅由364 μm降至51 μm。研究结果可以为辅汽轮发电机组振动溯源及故障诊断的优化提供参考。

Abstract

To address the issue of unclear vibration transmission paths in auxiliary steam turbine-generator units

taking a high-speed auxiliary steam turbine-generator unit as the research object

a complete rotor-bearing-stator model of the unit was established

and a vibration transmission model was constructed based on operational transfer path analysis (OTPA). After which

the vibration transmission characteristics of the unit were analyzed. First of all

the finite element method was applied to obtain the frequency response function of each transmission path of the unit. Taking into account the excitation sources such as rotor imbalance

pulsating vapor force and unbalanced magnetic tension

the singular value decomposition technique was adopted to reduce the noise and synthesize the input signals at the bearing seats

the transfer function matrix of the relationship between the inputs and outputs of various paths was constructed

and the vibration contribution of the different paths to the stator shell was analyze to clarify the main vibration transmission paths. Results show that the main vibration paths of the stator shell vibration at each measurement point originate from the two bearing housings of the auxiliary steam turbine

especially the generator-side bearing housing has the largest vibration contribution. The stator shell vibration can be effectively reduced by optimizing the adjustment of the structural intrinsic characteristics of the bearing housings and the phase difference of the rotor imbalance force

with the maximum amplitude being reduced from 364 μm to 51 μm. The research results can provide a reference for tracing the vibration of auxiliary steam turbine-generator units and optimizing the diagnosis of faults.

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