使用磁流变阻尼器的大型汽轮发电机定子端部绕组振动控制
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摘要
为控制大型二极汽轮发电机定子端部绕组产生的强迫振动,提出了基于磁流变阻尼器端部绕组的减振方法。将端部绕组及支撑结构简化为等效均质连续的三维板壳组合模型,采用Sig-moid力学模型计算阻尼器的阻尼力,建立了加装磁流变阻尼器的端部绕组的振动控制方程,通过直接积分法计算了电磁力作用下某大型汽轮发电机定子端部绕组加装磁流变阻尼器前后的振动响应。计算结果表明,磁流变阻尼器使端部绕组中径向、轴向动应力幅值分别降低了17.3%、55.9%,采用磁流变阻尼器是控制发电机端部绕组振动的一种有效方法。
To control the forced vibration of the stator end winding of large generators,a vibration isolation strategy based on magneto rheological damper is proposed.The stator end winding is simplified as a 3-D continuous homogeneous model of plates and shells,and the damping force produced by magneto rheological dampers is calculated adopting Sigmoid model.The governing equations of the stator end winding with magneto rheological dampers are discretized by finite element method.Forced responses of a stator end winding with and without magneto rheological dampers caused by electromagnetic forces are evaluated by numerical integration.The results show that dampers enable to reduce peaks of radial and axial stresses by 17.3% and 55.9% respectively.
To control the forced vibration of the stator end winding of large generators,a vibration isolation strategy based on magneto rheological damper is proposed.The stator end winding is simplified as a 3-D continuous homogeneous model of plates and shells,and the damping force produced by magneto rheological dampers is calculated adopting Sigmoid model.The governing equations of the stator end winding with magneto rheological dampers are discretized by finite element method.Forced responses of a stator end winding with and without magneto rheological dampers caused by electromagnetic forces are evaluated by numerical integration.The results show that dampers enable to reduce peaks of radial and axial stresses by 17.3% and 55.9% respectively.
引文
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[8]关新春,欧进萍.磁流变减振驱动器的响应时间试验与分析[J].地震工程与工程振动,2002,22(6):96-102.GUAN Xinchun,OU Jinping.Response time experi-ment and analysis of magnetorheological fluid actuator[J].Earthquake Engineering and Engineering Vibra-tion,2002,22(6):96-102.
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[11]徐赵东,沈亚鹏.磁流变阻尼器的计算模型及仿真分析[J].建筑结构,2003,33(1):68-71.XU Zhaodong,SHEN Yapeng.Calculating modelsand Simulink analysis about magnetorheological damp-er[J].Building Structure,2003,33(1):68-71.
[12]汪建晓,孟光.磁流变液阻尼器用于振动控制的理论及实验研究[J].振动与冲击,2001,20(2):39-46.WANG Jianxia,MENG Guan.Theoretical and experi-mental study on the vibration control by magneto-rheo-logical fluid dampers[J].Journal of Vibration andShock,2001,20(2):39-46.
[2]王玉田,袁晓红.大型汽轮发电机定子绕组端部固定方法[J].大电机技术,2011(2):15-16.WANG Yutian,YUAN Xiaohong.Discussion on fix-ing methods of large turbogenerator stator endingsoverhang[J].Large Electric Machine and HydraulicTurbine,2011(2):15-16.
[3]邱家俊,胡宇达,卿光辉.电磁力激发下汽轮发电机定子端部绕组的磁固耦合振动[J].振动工程学报,2002,15(3):267-273.QIU Jiajun,HU Yuda,QING Guanghui.Magnetismand solid coupling vibration of turbogenerator statorend windings under electromagnetic force[J].Journalof Vibration Engineering,2002,15(3):267-273.
[4]胡宇达,邱家俊.电磁力作用下发电机定子端部绕组的两自由度主共振[J].固体力学学报,2004,25(4):439-445.HU Yuda,QIU Jiajun.Two-degree-of-freedom princi-ple resonance and bifurcation of generator end windingunder electromagnetic force and friction force[J].Ac-ta Mechanica Solida Sinica,2004,25(4):439-445.
[5]姚大坤,曲大庄,李虹,等.大型汽轮发电机定子端部绕组动态特性研究[J].大电机技术,2002(2):1-4.YAO Dakun,QU Dazhuang,LI Hong,et al.Studyon end winding dynamic character of large turbogener-ator[J].Large Electric Machine and Hydraulic Tur-bine,2002(2):1-4.
[6]成中均,黄立民,李晓霞.大型汽轮发电机定子端部绕组固有频率测试与分析[J].大电机技术,1999(4):1-8.CHENG Zhongyun,HUANG Limin,LI Xiaoxia.Measurement and analysis of the natural frequency ofthe end winding on large turbogenerator stator[J].Large Electric Machine and Hydraulic Turbine,1999(4):1-8.
[7]姚大坤,沈梁伟.发电机定子端部绕组动态特性标准探讨[J].电力设备,2002,3(3):61-64.YAO Dakun,SHEN Liangwei.Dynamic characteristicstandards discussion on of stator end windings of largeturbo-generator[J].Electrical Equipment,2002,3(3):61-64.
[8]关新春,欧进萍.磁流变减振驱动器的响应时间试验与分析[J].地震工程与工程振动,2002,22(6):96-102.GUAN Xinchun,OU Jinping.Response time experi-ment and analysis of magnetorheological fluid actuator[J].Earthquake Engineering and Engineering Vibra-tion,2002,22(6):96-102.
[9]王震鸣.复合材料力学和复合材料结构力学[M].北京:机械工业出版社,1991:71-81.
[10]DRUBEL O,KULIG S,SENSKE K.End windingdeformations in different turbo generators during 3-phase short circuit and full load operation[J].Electri-cal Engineering,2000(82):145-152.
[11]徐赵东,沈亚鹏.磁流变阻尼器的计算模型及仿真分析[J].建筑结构,2003,33(1):68-71.XU Zhaodong,SHEN Yapeng.Calculating modelsand Simulink analysis about magnetorheological damp-er[J].Building Structure,2003,33(1):68-71.
[12]汪建晓,孟光.磁流变液阻尼器用于振动控制的理论及实验研究[J].振动与冲击,2001,20(2):39-46.WANG Jianxia,MENG Guan.Theoretical and experi-mental study on the vibration control by magneto-rheo-logical fluid dampers[J].Journal of Vibration andShock,2001,20(2):39-46.
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