水力发电学报2017，Vol.36Issue(11)：23-31,9.DOI:10.11660/slfdxb.20171103
时变油膜力下贯流式机组耦合故障动力学分析
Dynamic analysis on misalignment and rub-impact faults of tubular turbines under time-varying nonlinear oil film forces
摘要
Abstract
Rub-impact between the oil pipe and floating tile of a tubular turbine under excitation by multifault source coupling could cause the aggravation of its vibrations and oil leakage that reduce its operating safety considerably.Considering the time-varying nonlinear oil film forces,this study develops a coupling dynamic model for a tubular turbine system with misalignment and rub-impact,and examines their effects on the dynamic behaviors of the system under interaction with the oil impurities and radial stiffness of the oil receiver.Results show that the system undergoes diverse nonlinear motions such as periodic motions and quasi-periods corresponding to different magnitudes of misalignment,featured with a vibration spectrum dominated by various low frequencies and large amplitudes.And working oil impurity induces the occurrence of rub-impact;the harmonic components become more complicated under the coupling effect and mutual excitation of misalignment,rub-impact and oil film forces.Moreover,reduction in the radial stiffness of oil supply may lead to an unstable chaotic state of the system.The results would lay a theoretical basis for safe operation and multi-fault diagnosis ofhydropower units.关键词
水轮发电机组/多故障源耦合/时变非线性油膜力/碰摩/非线性动力学Key words
hydroelectric generating set/multi-fault source coupling/time-varying nonlinear oil film force/rub-impact/nonlinear dynamics分类
建筑与水利引用本文复制引用
党建,贾嵘,武桦,董开松..时变油膜力下贯流式机组耦合故障动力学分析[J].水力发电学报,2017,36(11):23-31,9.基金项目
国家自然科学基金(51779206 （）
51279161) （）
陕西省水利科技计划项目(2015slkj-04) （2015slkj-04）
电网公司科技项目(522722150012) （522722150012）
