故障受油器影响下灯泡贯流式机组非线性振动特性

针对故障受油器引发的灯泡贯流式机组事故，为提高机组运行的安全性和稳定性，基于构建复合偏心影响下不平衡磁拉力模型，建立多振源激励下含故障受油器灯泡贯流式机组轴系模型及其运动微分方程.应用数值计算方法分析有无故障受油器系统动态特性的差异，对系统在励磁电流、气隙静偏心以及动偏心变化过程中的非线性振动特性进行研究.结果表明：故障受油器的存在虽加大了转子非稳态运动范围并激发转子不利振动形式，但其对抑制系统振幅、削弱谐波成分表现出一定的积极作用，使机组受迫振动程度得以减缓；相比于数值固定的静偏心，随机组转动而不断变化的动偏心可使系统产生拟周期、周期二等丰富的动态响应形式，并进一步缩减了系统整体稳定运行范围，需引起足够重视.研究结果可为灯泡贯流式机组安全运行及稳定性分析提供一定借鉴.

Nonlinear vibration characteristics of bulb tubular unit under influence of faulty oil receiver

Accident of bulb tubular unit caused by fault oil receiver components occasionally, which directly affects the safety and stability of unit operation. Based on constructing unbalanced magnetic pull model under the influence of compound eccentricities, the shaft model of bulb tubular unit with fault oil receiver and corresponding differential equation are established. Nonlinear vibration characte-ristics of rotor system in the process of excitation current, static eccentricity of air gap and dynamic eccentricity are studied by numerical analysis. The results show that, on one side, the unsteady motion range and the adverse vibration of rotor is increased due to fault oil receiver, on the other side, the failure part plays a positive role in suppressing system amplitude and weakening harmonic component to certain extent. Furthermore, compared with the constant static eccentricity, the dynamic eccentricity, which is continually changing with the unit operation, makes the system produce more abundant responses such as quasi-periodic and periodic-2 motions, meanwhile, the stable operating range is reduced, which needs to be paid enough attention to. The results can provide useful references for the safe operation and stability analysis of bulb tubular hydropower units.