参数异变性对冲击式水电站系统轴系振动摆度影响

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摘要为深入研究水轮发电机组参数异变对冲击式水电站系统轴系振动摆度影响，在引入分数阶阻尼力基础上，建立包含压力引水管道、调速器和水轮发电机组等多子系统耦合的冲击式水电站系统分数阶模型。研究不同分数阶阶次下励磁电流、上导轴承刚度、下导轴承刚度、水导轴承刚度和转速值异变对水电站服役性能参数转子轴心偏移的影响。分析结果表明：服役性能参数在励磁电流影响下所呈现非线性动力演化过程具有统一性；在轴承刚度参数影响下所呈现动力失稳方式不同。通过对系统失速振动幅度分析，发现振动幅值在转速上升过程出现跳跃现象。上述研究结果为后续揭示冲击式水电站系统故障诊断机理提供理论依据。

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	许贝贝1
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关键词 ：冲击式水电站, 参数异变性, 振动摆度, 动力演化, 分数阶

Abstract：To deeply study effects of structural parameters variation on shafting vibration of a Pelton hydropower station system, a nonlinear mathematical model with fractional order damping force was established for the system considering coupling among multi-subsystem including pressure penstock, governor, and hydro-turbine generator unit.Effects of excitation current, upper guide bearing stiffness, lower guide bearing one, water guide bearing one and its rotating speed on the system’s service performance parameters, such as, shaft offset, generator rotating speed, etc.were studied under damping force with different fractional orders.The results showed that nonlinear dynamic evolution processes revealed by the system’s service performance parameters have a unity under excitation current variation; the system dynamic instability modes are different under the variation of bearing stiffness parameters; the system shafting vibration amplitude has jump phenomenon with increase in rotating speed; the study results provides a theoretical basis for further revealing fault diagnosis mechanism of Pelton hydropower station systems.
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Key words： Pelton hydropower station parameter variation shafting vibration dynamic evolution fractional order

收稿日期: 2018-05-24 出版日期: 2019-11-28

引用本文:

许贝贝1,2，陈帝伊1,2，李欢欢1,2，闫懂林1,2. 参数异变性对冲击式水电站系统轴系振动摆度影响[J]. 振动与冲击, 2019, 38(23): 10-18.
XU Beibei1,2, CHEN Diyi1,2, LI Huanhuan1,2, YAN Donglin1,2. Effects of parameter variation on a Pelton hydropower station system’s shafting vibration. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(23): 10-18.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2019/V38/I23/10

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