大型非线性转子-密封-轴承系统的不平衡响应与稳定性

崔 颖;刘占生;叶建槐

振动与冲击 ›› 2011, Vol. 30 ›› Issue (5) : 205-207.

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PDF(1457 KB)
振动与冲击 ›› 2011, Vol. 30 ›› Issue (5) : 205-207.
论文

大型非线性转子-密封-轴承系统的不平衡响应与稳定性

  • 崔 颖;刘占生; 叶建槐
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DYNAMIC RESPONSE AND STABILITY OF LARGE SCALE NONLINEAR ROTOR-SEAL-BEARING SYSTEM

  • Cui Ying; Liu Zhansheng;Ye Jianhuai
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摘要


摘 要:对实际大型汽轮机转子-密封-轴承系统建立了具有超大规模维数的非线性动力学模型,该模型考虑了密封的非线性激振力、可倾瓦轴承的弹性支承力、转子的阻尼力、不平衡质量力和重力。采用Newmark方法对其进行数值求解,模拟出转子升速过程中汽流激振现象的典型特征和发生汽流激振的失稳转速,并且得到系统参数对转子不平衡响应和稳定性的影响规律。结果表明:适当的增大转子的阻尼、密封的半径间隙和密封流体轴向流速可提高转子发生汽流激振的失稳转速,这为在设计和运行中提高实际大型汽轮机转子-密封-轴承系统的稳定性提供了参考依据。

Abstract

Abstract: A nonlinear dynamic model of rotor - seal - bearing system with ultra-large-scale dimension for an actual steam turbine is proposed, in which the non-linear seal-excited force, the elastic support force of tilting-pad bearing, the damping force, imbalance force and gravity of rotor are considered. The unbalance response of the rotor is numerically calculated by the Newmark method. The typical characteristic of self-excited vibration and threshold speed of instability induced by the seal-force were revealed. The effects of system parameters on dynamic response and instability were also investigated. The results show that appropriately increases of rotor damping, seal’s radius clearance and axial velocity of seal fluid can improve the stability of the system by increasing the threshold speed of instability. The results can be used for improving the stability of rotor-seal-bearing system in the designing and operating of large steam turbine.

关键词

转子-密封-轴承系统 / 非线性 / 高维 / 不平衡响应 / 失稳转速

Key words

rotor - seal - bearing system / nonlinear / high-dimensional / unbalance response / threshold speed of instability.

引用本文

导出引用
崔 颖;刘占生;叶建槐. 大型非线性转子-密封-轴承系统的不平衡响应与稳定性[J]. 振动与冲击, 2011, 30(5): 205-207
Cui Ying;Liu Zhansheng;Ye Jianhuai. DYNAMIC RESPONSE AND STABILITY OF LARGE SCALE NONLINEAR ROTOR-SEAL-BEARING SYSTEM[J]. Journal of Vibration and Shock, 2011, 30(5): 205-207

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