灯泡贯流式机组水导轴承振动评估OA北大核心CSTPCD
Vibration evaluation of water guide bearing of bulb tubular unit
[目的]对于采用扇形支撑结构的灯泡贯流式机组水导轴承,水平方向的结构刚度不足,造成振动值偏大,需要对水导轴承振动进行评估,确定合理的振动限值,保障机组的安全稳定.[方法]对同类型机组的振动情况进行统计分析,开展有限元计算、振动和动应力的真机测试,分析动应力和振动的相关性,对水导轴承结构疲劳特性进行评估.[结果]结果显示:水导轴承水平振动统计样本分布的中位数为131.6 μm,根据标准要求取1.6倍中位数即200.0 µm作为振动限值的参考值;通过对凌津滩电厂机组水导轴承有限元的分析和真机实测,水导轴承体最大静应力为33.8 MPa,远小于许用应力要求,试验工况下水导轴承最大水平振动峰峰值为91.0 µm,扇形板最大动应力峰峰值为1.4MPa.[结论]结果表明:灯泡贯流式机组水导轴承水平振动随机组有功功率的增加而增加,振动与动应力主要频率为机组转频和桨叶叶片倍频率,且振动幅值与动应力幅值具有良好的线性关系,可通过线性拟合预测振动幅值在200.0μm下的动应力.根据得到的极限动应力结合有限元分析所得到的静应力数值,通过S-N曲线可得到水导轴承支撑结构的疲劳寿命和损伤系数,结果表明其能够满足使用寿命周期要求.
[Objective]For the water guide bearing with fan-shaped support structure,the horizontal structural stiffness is insuffi-cient,resulting in a large vibration value.It is necessary to evaluate the vibration of the water guide bearing and determine a rea-sonable vibration limit to ensure the safety and stability of the unit.[Methods]The vibration of the water guide bearing of the same type of bulb tubular unit is statistically analyzed.The finite element calculation of the water guide bearing is carried out.The field test of vibration and dynamic stress is carried out.The correlation between dynamic stress and vibration is analyzed.The fatigue characteristics of the water guide bearing structure are evaluated to determine the reasonable vibration limit.[Results]The result show that the median of the horizontal vibration statistical sample of the water guide bearing is 131.6 μm,according to the standard requirements,1.6 times the median value of 200.0 µm is taken as the reference value of the vibration limit.Based on the finite element analysis and actual measurement of the water guide bearing in Lingjintan Power Plant,the max-imum static stress of the water guide bearing is 33.8 MPa,which is far less than the allowable stress requirement,the maximum horizontal vibration peak value of the water guide bearing under test conditions is 91.0 µm,and the maximum dynamic stress peak value of the sector plate is 1.4 MPa.[Conclusion]The result show that:The horizontal vibration of water guide bearing of bulb tubular units increases with the increase of the active power of the unit,the main frequencies of vibration and dynamic stress are the rotation frequency of the unit and the frequency doubling of blade blades,the vibration amplitude has a good linear rela-tionship with the dynamic stress amplitude,and the dynamic stress at a vibration amplitude of 200.0 µm can be predicted by lin-ear fitting.According to the ultimate dynamic stress and static stress obtained by finite element analysis,the fatigue life and damage coefficient of water guide bearing support structure can be obtained by S-N curve,and the result show that it can meet the requirements of service life cycle.
付亮;王治国;王佩
湖南五凌电力科技有限公司,湖南长沙 410007哈尔滨大电机研究所,黑龙江哈尔滨 150040
能源与动力
灯泡贯流式机组水导轴承振动评估疲劳分析影响因素
bulb tubular unitwater guide bearingvibration assessmentfatigue analysisinfluence factor
《水利水电技术（中英文）》 2024 (007)
104-113 / 10
国家科技支撑计划项目(2012BAF12B16-1);黑龙江省自然科学基金项目(ZD2020E002);湖南省自然科学基金项目(2024JJ9169)
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