Unstable Vibration induced by full annular rub between carbon brushes and rotor in a generator

PDF(1799 KB)

Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (1) : 108-113.

TIAN Yong wei

Author information +

History +

Abstract

Here, the vibration characteristics induced by full annular rub between carbon brushes and rotor in a generator were analyzed. According to carbon brushes working principle, a rub force model was set up. The rub cross-section temperature field and the rotor's thermal bending model were built based on the theory of thermoelasticity. The rotor thermal bending model was coupled with the rotor FE dynamic model, and the system vibration responses were computed with the coupled model. Vibration characteristics were analyzed with a generator rotor model. Results showed that the rub between carbon brushes and the rotor can cause the systems spiral or divergent unstable vibration. The effects of unbalance force, carbon brushesrotor non-concentricity and brushers friction coeficient on the sytem vibration were studied. It was shown that unstable vibration can be eliminated through using more refined dynamic balance, increasing carbon brushesrotor non-concentricity, or reducing brushers friction coeficient.

Key words

carbon brush / rub / rotating machinery

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

TIAN Yong wei. Unstable Vibration induced by full annular rub between carbon brushes and rotor in a generator[J]. Journal of Vibration and Shock, 2017, 36(1): 108-113

References

[1] 褚福磊,汤晓瑛,唐云. 碰摩转子系统的稳定性[J].清华大学学报(自然科学版),2000,40(4):119-123
CHU Fulei, TANG Xiaoying, TANG Yun. Stability of a rub-impact rotor system[J]. Journal of Tsinghua University (Sci & Tech),2000,40(4):119-123
[2] Cai Wan, Chang Jian, Chao Kuang Chen. Chaos and bifurcation of a flexible rub-impact rotor supported by oil film bearings with nonlinear suspension[J]. Mechanism and Machine Theory, 2007(42):312-333
[3] 张雷克,马震岳. 不平衡磁拉力作用下水轮发电机组转子系统碰摩动力学分析[J]. 振动与冲击,2013,32(8):48-54
ZHANG Lei-ke, MA Zhen-yue. Dynamic analysis for rotor system with rub-impact of a hydraulic generating set under unbalanced magnetic pull[J]. Journal of Vibration and Shock, 2013,32(8):48-54
[4] Larsson B. Heat separation in frictional rotor-seal contact[J].ASME Journal of Tribology. 2003, 125(3):600-607
[5] Jerzy T Sawicki, Alberto Montilla,etc. Thermomechanical Behavior of Rotor with Rubbing[J]. International Journal of Rotating Machinery,2003,9(1):41-47
[6] Bachschmid N, Pennacchi P, Vania A. Thermally induced vibrations due to rub in real rotors [J].Journal of Sound and Vibration, 2007, 299(4-5), 683-719
[7] 杨建刚,黄葆华,高伟. 摩擦热冲击问题的建模、仿真与振动特性分析[J]. 中国电机工程学报,1999,19(6):68-73
Yang Jiangang, Guang Baohua, Gao wei. Modeling simulation and vibration analysis of rub-induced thermal impact problem[J]. Proceedings of the CSEE, 1999,19(6):68-73
[8] 黄葆华,杨建刚,高伟.摩擦热弯曲对转子稳定性的影响[J].振动工程学报,2001,14(1): 23-28
Huang Baohua, Yang Jiangang, Gao Wei. Influence of thermal bow on the stability of rubbing bearing-rotor system[J]. Journal of vibration engineering, 2001,14(1): 23-28
[9] J.J.Yu,P. Goldman, D.E. bently,etl. Rotor Seal experimental and analytical study on full annular rub[J]. Journal of engineering for gas turbines and power,2002,124:340-350
[10]赵建民,安志勇等. 北重330MW机组间隙性振动原因分析及处理[J].热力发电,2014,43(8):158-160
Zhao Jianmin, An Zhiyong, etc. Carbon deposition and rubbing of oil baffle in a 330MW unit turbine: reason analysis and treatment[J]. Thermal power generation, 2014,43(8):158-160
[11]赵智慧,刘立军.引进型300MW汽轮发电机组7号轴承振动分析[J].汽轮机技术,2007,49(3):228-229
Zhao Zhihui, Liu Lijun. Research of the No.7 bearing’s vibration of 300MW introduced turbine-generator unit[J]. Turbine technology, 2007,49(3):228-229
[12]宋光雄,杨涛等.汽轮机组轴颈碰摩故障分析与研究[J].汽轮机技术,2011,53(3):213-216
Song Guangxiong, Yang Tao, etc. Analysis and study on bearing location rub-impact fault of turbine generator units[J]. Turbine technology, 2011,53(3):213-216