轴流式水轮发电机组不对中-碰摩耦合故障振动特性分析

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (8) : 11-18.

论文

张雷克1，蔚建辉1，王雪妮2,1，张金剑3，马震岳3，邓显羽4

作者信息 +

Vibration characteristics of misalignment-rubbing coupling fault foran axial-flow hydrogenerator unit

ZHANG Leike1，YU Jianhui1，WANG Xueni2,1，ZHANG Jinjian3，MA Zhenyue3，DENG Xianyu4

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文章历史 +

摘要

针对轴流式水轮发电机组因联轴器偏角不对中引起的碰摩转子-转轮系统振动问题，基于修正的LuGre摩擦模型，本文推导了联轴器不对中故障下转轮叶片碰摩力表达式。在此基础上，搭建了综合考虑不平衡磁拉力等外激励作用下系统动力学模型。采用数值方法研究了不对中角度对系统振动特性的影响，并结合Floquet理论分析了以转速为控制变量的系统周期解稳定性。结果表明：不对中的存在增大了系统发生失稳可能性，显著改变了系统动态特性。此外，不对中角度对转子与转轮振动响应的影响具有较大差异，随着不对中角度的增加，转轮振动变化明显且碰摩程度较为恶劣。本文研究结果可为轴流式水轮发电机组安全运行及稳定性分析提供有益借鉴。

Abstract

Aiming at the vibration problem of the rub-impact rotor-runner system in axial-flow hydrogenerator set caused by misalignment of coupling Angle, based on the modified LuGre friction model,the expressions for the rub-impact forces of runner blades under the misalignment fault are derived in this paper. On this basis, the system dynamic model is established which comprehensively considers external excitations including unbalanced magnetic pull force. The influence of the misalignment angle on the vibration characteristics of the system is studied by numerical method, and the stability of the periodic solution of the system with the speed as the control variable is analyzed based on Floquet theory. The results show that the existence of misalignment significantly changes the dynamic characteristics and increases the possibility of system instability. In addition, the effect of the misalignment angle on the vibration response of the rotor and the runner is quite different. With the increase of the misalignment angle, the runner vibration varies obviously and the degree of rub-impact is worse. The research results in this paper can provide references for the safe operation and stability analysis of axial-flow hydrogenerator set.

导出引用

张雷克1，蔚建辉1，王雪妮2,1，张金剑3，马震岳3，邓显羽4. 轴流式水轮发电机组不对中-碰摩耦合故障振动特性分析[J]. 振动与冲击, 2024, 43(8): 11-18

ZHANG Leike1，YU Jianhui1，WANG Xueni2,1，ZHANG Jinjian3，MA Zhenyue3，DENG Xianyu4. Vibration characteristics of misalignment-rubbing coupling fault foran axial-flow hydrogenerator unit[J]. Journal of Vibration and Shock, 2024, 43(8): 11-18

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