Identification Investigation of Oil-Film Dynamic Coefficients of Large-Size Journal Bearings

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Identification Investigation of Oil-Film Dynamic Coefficients of Large-Size Journal Bearings

更新时间：2025-07-09

- Identification Investigation of Oil-Film Dynamic Coefficients of Large-Size Journal Bearings
- Vol. 44, Issue 7, Pages: 75-78(2010)
- 作者机构：
  
  1. 西安交通大学机械电子及信息系统研究所,西安,710049
  2. 西安交通大学强度与振动教育部重点实验室,西安,710049
  3. 武警工程学院电子技术系,西安,710086
- 作者简介：
- 基金信息：
- DOI：
  CLC： TH133.3
- Online First：10 July 2010，
  
  Published：2010
- 稿件说明：
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Identification Investigation of Oil-Film Dynamic Coefficients of Large-Size Journal Bearings[J]. 2010, 44(7): 75-78.
DOI：

Identification Investigation of Oil-Film Dynamic Coefficients of Large-Size Journal Bearings[J]. 2010, 44(7): 75-78. DOI：

摘要

为解决大型滑动轴承难以施加外部激励的难题

根据高速动平衡机摆架刚度可变且水平和垂直方向等刚度设计的特点

简化了轴承与摆架系统的物理模型

给出了一套基于动平衡实验的最小二乘辨识方法.该方法可在动平衡机上便捷地开展全尺寸实验

快速地辨识出大尺寸轴承油膜动特性系数

利用摆架动刚度测试一次性获取了摆架等效刚度和参振质量.通过300 MW汽轮机的测试数据进行了实验验证

结果表明

摆架固有参数的变化对识别结果有较大影响

尤其以摆架等效刚度的影响最为灵敏

而且固有参数变化的辨识结果与实验结果吻合较好

参数识别精度最大可提高17%.

Abstract

To solve the difficulty in imposing high-power external excitation on a large-size journal bearing

a least square method is presented with a simplified identification model of bearing-pedestal system

considering the changeable bearing-pedestal stiffness of high-speed dynamic balancing machine. A full-size test rig is designed to fast identify the oil-film dynamic coefficients of large size journal bearings. The vibration mass and equivalent stiffness can be obtained at one time by the dynamic stiffness test

and their influences are discussed and verified by the test data of a 300 MW turbo-generator. The results show that the changes of the inherent parameters

especially the stiffness of the bearing-pedestal

obviously affect the identification accuracy. The identification results considering the changes of the inherent parameters coincide with the experimental ones. The highest identification accuracy improvement reaches 17%.

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Keywords

references

王丽萍,乔广,郑铁生.可倾瓦轴承的完整动力分析模型及计算方法 [J]. 机械工程学报, 2008,44(1):75-80.

WANG Liping, QIAO Guang, ZHENG Tiesheng. Analysis and calculate model for the complete dynamical coefficients of tilting-pad bearings [J].Journal of Mechanical Engineering, 2008,44(1):75-80.

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DIMOND T W, SHETH P N, ALLAIRE P E, et al. Identification methods and test results for tilting pad and fixed geometry journal bearing dynamic coefficients: a review [J]. Shock and Vibration, 2009,16(1):13-43.

姚大坤,黄文虎,邹经湘. 滑动轴承油膜刚度参数的识别 [J].动力工程, 2005,25(4):483-486.

YAO Dakun, HUANG Wenhu, ZHOU Jingxiang. Identification of oil-film stiffness coefficients of journal bearings [J]. Journal of Power Engineering, 2005,25(4):483-486.

马金奎,刘元峰,朱振杰,等.基于小波分析的滑动轴承参数识别研究 [J].机械工程学报, 2000,36(5):81-88.

MA Jinkui, LIU Yuanfeng, ZHU Zhenjie, et al. Study on dynamic parameter identification of journal bearing based on wavelets [J]. Chinese Journal of Mechanical Engineering, 2000,36(5):81-88.

段吉安. 转子轴承系统油膜动特性研究及模态参数识别的研究 [D].西安:西安交通大学机械工程学院,1996.

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