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首页> 外文期刊>International journal of non-linear mechanics >Active control of coupled flexural-torsional vibration in a flexible rotor-bearing system using electromagnetic actuator
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Active control of coupled flexural-torsional vibration in a flexible rotor-bearing system using electromagnetic actuator

机译：使用电磁致动器主动控制挠性转子-轴承系统中的挠曲-扭转振动耦合

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摘要

Rotor-shaft systems are subject to non-uniform spin speed during start-up, coast-down or any non-stationary situation changing the spin speed suddenly, e.g., load fluctuation or sudden mass-loss like loss of a blade or a part thereof. For a flexurally and torsionally compliant rotor-shaft, the dynamics under non-uniform spin-speed shows inertial coupling among transverse and torsional coordinates through mass-unbalance and gyroscopic effect. This results into coupled transverse-torsional vibration, where torsional response consists of significant harmonic components at bisynchronous spin frequency, torsional natural frequency of the shaft, and at combination frequencies corresponding to sum and difference of spin and transverse natural frequencies and twice the transverse natural frequency of the rotor-shaft. As a result of the coupling, transverse rotor motion also influences the torsional motion. The Method of Multiple Scales (MMS) is used in this work to carry out an analysis of a simplified system to get an idea about the dominant frequencies of excitation. Results of numerical simulation are presented next to show the effectiveness and influence of actively controlling the transverse rotor motion on its torsional motion, at the dominant frequencies, with the help of non-contact electromagnetic force from an actuator. Transverse vibration control is also observed to control the torsional oscillations due to coupled nature of the problem. The Stability Limit Speed (SLS) of the system is also increased as a result of application of the active control action. Constant axial torque is observed to diminish the influence of coupling, and protect the system against torsional instability, but control action is a must to stabilize the transverse vibration of the system above SLS.
机译：转子轴系统在启动，滑行或任何非平稳的情况下会突然出现不均匀的旋转速度，例如突然改变旋转速度的旋转，例如负载波动或突然的质量损失，例如叶片或其一部分的损失。对于挠曲和挠曲的转子轴，在非均匀旋转速度下的动力学通过质量不平衡和陀螺效应显示了横向和扭转坐标之间的惯性耦合。这导致耦合的横向扭转振动，其中扭转响应由双同步自旋频率，轴的扭转固有频率以及对应于自旋和横向固有频率之和与差的组合频率和横向固有频率的两倍的重要谐波分量组成转子轴的通过耦合，转子的横向运动也影响扭转运动。在这项工作中，使用了多尺度方法（MMS）对简化的系统进行了分析，从而获得了关于激励的主导频率的想法。接下来给出数值模拟的结果，以示出在来自执行器的非接触电磁力的帮助下，主动控制横向转子运动对其在主频上的扭转运动的影响和影响。由于问题的耦合性质，还观察到横向振动控制来控制扭转振动。由于应用了主动控制措施，系统的稳定极限速度（SLS）也得到了提高。观察到恒定的轴向扭矩可以减小耦合的影响，并保护系统免受扭转不稳定性的影响，但是必须采取控制措施，才能稳定系统在SLS上方的横向振动。

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