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以水轮发电机组转子系统为研究对象,针对刚性联轴器综合不对中引起转子局部碰摩的问题,建立了机组转子不对中–碰摩耦合故障的动力学模型和微分方程,并利用数值积分方法研究该系统随不对中平行量和偏角参数变化的动力学行为。通过分岔图、Poincaré截面图、轴心轨迹图、时域波形图和幅值谱图系统地分析了发电机转子与水轮机转子在耦合故障下非线性动力学响应,发现机组转子系统随不对中平行量和偏角变化存在周期运动和复杂的拟周期,其碰摩过程非常复杂,机组故障特征频率除主要在1倍频外,还在0.3~0.4倍频处存在幅值较大的谐波分量。研究结果为水轮发电机组安全运行和准确识别转子不对中、碰摩故障提供有益的理论依据。
Taking the rotor system of hydro-generator set as the research object, aiming at the problem of local rub-impact caused by the misalignment of the rigid coupling, the dynamic model and differential equation of the rotor-misalignment-rubbing coupling failure are established. Numerical integration Methods The dynamic behavior of the system with the change of misalignment parallel parameters and declination parameters was studied. The nonlinear dynamic response of generator rotor and turbine rotor under coupling failure was systematically analyzed by bifurcation diagram, Poincaré section, axial locus diagram, time-domain waveform diagram and amplitude spectrum. The rotor system of the generator was found to be misaligned with misalignment There are periodic motion and complex quasi-periodic changes in the amount of parallel and declination, and the rubbing process is very complicated. Except for the primary harmonic frequency, the characteristic frequency of the fault also has the harmonic with the larger amplitude at the frequency of 0.3-0.4 Component. The results provide useful theoretical basis for the safe operation of hydro-generator units and accurate identification of rotor misalignment and rub-impact faults.