排灌机械工程学报
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排灌机械工程学报  2017, Vol. 35 Issue (5): 398-403    DOI: 10.3969/j.issn.1674-8530.16.0169
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随机水力激励下机组轴系的动力响应
白冰1, 张立翔2
1.华北水利水电大学土木与交通学院, 河南 郑州 450011; 2.昆明理工大学建筑工程学院, 云南 昆明 650500
Dynamic response of hydro-turbine set shaft system under stochastic hydraulic excitation
BAI Bing1, ZHANG Lixiang2
1. School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450011, China; 2.Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, Yunnan 650500, China
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摘要 简要分析了水轮发电机组轴系上的作用力,包括导轴承上的非线性油膜力、转子与转轮上的机械不平衡力、转子上的不平衡磁拉力和转轮上的水力不平衡力.采用零均值i.i.d.随机数序列模拟作用于水轮机转轮上的随机水力激励,通过调整随机数方差来改变随机水力激励的大小,建立了水轮发电机组轴系的非线性动力学模型.求解得到了机组轴系关键部位(转子、转轮和3个导轴承)响应的时域波形图、轴心轨迹图、频谱图和庞加莱图,以及系统响应的分岔图.结果表明:水轮机转轮上作用的随机水力激励对于轴系上部的上导轴承、发电机转子影响较小,对于下导轴承影响适中,对于轴系下部的水导轴承和水轮机转轮影响比较大.随着随机水力激励增强,水导轴承处和水轮机转轮处轴的横向摆度均发生明显的分叉,已明显影响了轴系的振动形态和振动稳定性.
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白冰
张立翔
关键词水轮发电机组   轴系   动力响应   随机水力激励   非线性磁拉力   非线性油膜力     
Abstract: The forces acting on a hydro-turbine generator set shaft system were analyzed, including the nonlinear oil film force in the guide bearings, mechanical unbalanced forces on the rotor and runner, the unbalanced magnetic force on the rotor, and the hydraulic imbalance force on the runner. Then a nonlinear dynamic model for the shaft system was established, and the stochastic hydraulic excitation in the model was simulated with a zero mean, identically independent distributed(i.i.d.)signal, and its magnitude was changed by adjusting the random variance. The responses of the key parts(rotor, runner and guide bearings)to the changes in rotational speed, eccentric mass and exciting current, namely amplitude-time history curves, trajectory, amplitude spectra and Poincare diagram and bifurcation patterns, were obtained by solving the dynamic model equations. Results showed that the rotational speed and eccentric mass have a considerable influence on the vibration response of main parts in the shaft system. And the lateral throws at the turbine guide bearing and runner become obviously bifurcated as the stochastic hydraulic excitation increases. The excitation has strong influence on the vibration mode and stability of the shaft system.
Key wordshydro-turbine generator set   shaft system   dynamic response   stochastic hydraulic excitation   nonlinear magnetic pull   nonlinear oil film force   
收稿日期: 2016-07-20;
基金资助:国家自然科学基金重点资助项目(50839003);华北水利水电大学高层次人才引进资助项目
通讯作者: 张立翔(1959—),男,云南石屏人,教授,博士,博士生导师(通信作者:zlxzcc@126.com),主要从事流固耦合振动研究.   
作者简介: 白冰(1987—),男,河南郑州人,讲师,博士(baibing7777@ncwu.edu.cn),主要从事水轮发电机组轴系振动研究.
引用本文:   
白冰,张立翔. 随机水力激励下机组轴系的动力响应[J]. 排灌机械工程学报, 2017, 35(5): 398-403.
BAI Bing-,ZHANG Li-Xiang-. Dynamic response of hydro-turbine set shaft system under stochastic hydraulic excitation[J]. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(5): 398-403.
 
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