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600 MW超临界汽轮发电机组低压转子叶片脱落振动特性研究
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国家自然科学基金项目(51575176;11672106;51375162);湖南省教育厅优秀青年项目(16B093).


Study on Blade Loss Vibration Characteristics for Low Pressure Rotor of 600 MW Supercritical Steam Turbine Generator Units
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    摘要:

    针对国产600 MW超临界汽轮发电机组低压2转子末级叶片脱落故障问题,开展低压转子叶片脱落对机组轴系振动特性的影响研究。采用有限元法构建轴系动力学模型,进行临界转速与振型分析;通过施加瞬态激励力模拟叶片脱落,建立低压转子叶片脱落瞬态激励模型,开展机组轴系非线性瞬态时域分析,得到工作转速3 000 r/min下轴系叶片脱落和各轴承处振动响应;对比激励前后振动响应,总结低压转子叶片脱落故障对轴系振动的影响规律。研究发现,轴系振型以各跨转子弯曲振型为主,叶片脱落主要影响其所在跨转子的振动特性,且表现为典型的瞬态不平衡振动特性。

    Abstract:

    As for the rotor with blade loss fault occurred in the 600 MW supercritical steam turbine generator units,the vibration characteristics of low pressure rotor 2 with last stage blade loss were studied.The dynamics model of the shaft system was built by the finite element method to analyze the critical speed and mode shape.By applying the transient excitation force to simulate the last stage blade loss of low pressure rotor,the model of low pressure rotor blade loss was established.The nonlinear transient timedomain response analysis for the shaft system were carried out to obtain the responses of blade loss point and bearings at operational speed 3 000 r/min.Compared with the vibration responses before and after of transient excitation,the effect of low pressure rotor with blade loss effect on the shaft system was confirmed.It is shown that the shaft system mode mainly is dominated by the bending mode of its rotor.The vibration response is obvious for these bearings which belong to the rotor with blade loss,which presents as the typical transient unbalance vibration characteristics of rotor.

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宾光富,廖子豪,姚剑飞,郭帅平.600 MW超临界汽轮发电机组低压转子叶片脱落振动特性研究[J].润滑与密封,2017,42(12):73-78.
. Study on Blade Loss Vibration Characteristics for Low Pressure Rotor of 600 MW Supercritical Steam Turbine Generator Units[J]. Lubrication Engineering,2017,42(12):73-78.

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  • 在线发布日期: 2018-03-16
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