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首页> 外文期刊>Thermal engineering >The Impact of Design Deviations on Dynamic Characteristics of a Flexible Multispan Rotor on Complete Electromagnetic Suspension
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The Impact of Design Deviations on Dynamic Characteristics of a Flexible Multispan Rotor on Complete Electromagnetic Suspension

机译：设计偏差对柔性多跨转子动态电磁悬浮特性的影响

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The paper presents a study of dynamics of rotors on complete electromagnetic suspension, a characteristic feature of which is a relatively low stiffness of the support system. The experience of balancing the rotors of this type shows that deviations of geometrical parameters, although the latter are within design tolerance limits, may have a significant impact on the rotor dynamics. The analysis of the impact of design deviations caused by the nonorthogonality of the disk plane of the axial active magnetic bearings (AMBs) to the rotation axis and noncoaxiality of the rotor shafting in the elastic clutch section on the dynamics of the flexible multispan rotors was made. The model of the dynamics of the rotor was refined considering the above deviations. The resulting model of the dynamics of a rotor on the complete electromagnetic suspension comprises a mechanical model, models of forces of different physical nature, and a model of the AMB control system. The model takes into consideration the effects of forces in the radial and axial active magnetic bearings, imbalance, gyroscopic forces, the force of gravity, and the frequency-independent inner damping; it also describes circulation impacts and tension forces caused by electromagnetic interactions in the generator and exciter as well as gas-dynamic forces in turbines, compressors, and labyrinth seals of their shafts. It is shown in the paper that the considered design deviations caused by nonorthogonality of the disk plane of the axial AMB to the rotation axis and noncoaxiality of the rotor shafting in the elastic clutch section lead to amplitude- constant harmonic influences on the rotor, whose frequency coincides with the rotational speed of the rotor. The verification of the refined computer model was conducted on a scale-modeling test bench for the vertical flexible rotor of a high-temperature gas-cooled reactor. The testing of the model demonstrated qualitative identity of the numerical and experimental results that describe the rotor dynamics in the running- down mode. The proposed mathematical model of the flexible rotor allows for enhancing the precision of the method for identification of unknown parameters, in particular, the residual imbalance, based on solving the inverse dynamics problem.
机译：本文介绍了在完全电磁悬挂下转子的动力学研究，其特征是支撑系统的刚度相对较低。平衡此类转子的经验表明，尽管几何参数的偏差在设计公差范围内，但可能会对转子动力学产生重大影响。进行了分析，分析了由轴向主动磁性轴承（AMBs）的圆盘平面的非正交性对弹性离合器部分中的旋转轴的旋转轴和转子轴的非同轴性引起的设计偏差对柔性多跨转子动力学的影响。 。考虑到上述偏差，改进了转子的动力学模型。完整的电磁悬架上的转子动力学模型包括机械模型，不同物理性质的力模型以及AMB控制系统模型。该模型考虑了径向和轴向有源电磁轴承中的力，不平衡，陀螺力，重力以及与频率无关的内部阻尼的影响。它还描述了由发电机和励磁机中的电磁相互作用引起的循环冲击和拉力，以及涡轮机，压缩机及其轴的迷宫式密封中的气体动力。本文表明，由轴向AMB的圆盘平面相对于旋转轴的非正交性以及弹性离合器部分中的转子轴的非同轴性引起的已考虑的设计偏差会导致振幅恒定的谐波影响转子，其频率与转子的转速一致。精炼计算机模型的验证是在高温气冷反应堆的垂直柔性转子的比例模型测试台上进行的。模型的测试证明了数值和实验结果的定性一致性，这些结果描述了减速模式下的转子动力学。所提出的挠性转子的数学模型允许在解决逆动力学问题的基础上提高用于识别未知参数，特别是残余不平衡的方法的精度。

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