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首页> 外文会议>International Symposium on Stability Control of Rotating Machinery(ISCORMA-4); 20070827-31; Calgary(CA) >EXPERIMENTAL STUDIES OF RUB CONTROL WITH AN ACTIVE AUXILIARY BEARING
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EXPERIMENTAL STUDIES OF RUB CONTROL WITH AN ACTIVE AUXILIARY BEARING

机译：主动辅助轴承控制橡胶的实验研究

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摘要

A new approach to control a rubbing rotor by applying an active auxiliary bearing is presented. The auxiliary bearing is attached to the foundation via two unidirectional actuators. The control force is applied indirectly using the active auxiliary bearing, only in case of rubbing. A robust control system has been developed which reduces the intensity of rubbing significantly by stabilizing the rotor system and assuring an optimal rubbing state. The model based cascade control consists of a feedback control of the actuators, the computation of the target trajectory and an activation routine which tracks the orbit of the rotor. The control system is activated shortly before the occurrence of the first impact, if a contact between rotor and the auxiliary bearing is inevitable. In the first phase, when the contact is still open, a target trajectory for the movement of the auxiliary bearing is determined, which synchronizes the auxiliary bearing with the orbit of the rotor. The synchronization is followed by a smooth transition to a contact. Thereby, the relative velocity is minimized, depending on the deflection of the rotor. In the second control phase (during contact) a target trajectory is determined, which keeps a permanent contact with low contact forces and produces a state of synchronous full annular rub. Furthermore, the controller assures at all times that the rotor deflection does not exceed the initial air gap of the auxiliary bearing, to keep its general purpose in mind - the limitation of the deflection. The feedback control of the actuators is based on a feedback linearization and assures an accurate and robust motion control of the auxiliary bearing throughout the full range of possible contact forces and impacts. In the plane perpendicular to the rotor at the location of the auxiliary bearing the displacement of the rotor and the auxiliary bearing are measured. Only these signals are used for the controller. On a test rig the performance of an active auxiliary bearing has been studied experimentally. Various experiments show the success of the control strategy. By using the proposed control system, the contact forces are reduced up to 90 per cent and the rotor deflection decreases significantly.
机译：提出了一种通过应用主动辅助轴承来控制摩擦转子的新方法。辅助轴承通过两个单向执行器连接到基础。仅在发生摩擦时，才通过主动辅助轴承间接施加控制力。已经开发了一种鲁棒的控制系统，该系统通过稳定转子系统并确保最佳的摩擦状态来显着降低摩擦强度。基于模型的级联控制包括执行器的反馈控制，目标轨迹的计算以及跟踪转子轨道的激活例程。如果不可避免地在转子和辅助轴承之间发生接触，则在第一次撞击发生之前不久就激活控制系统。在第一阶段，当触点仍断开时，确定辅助轴承运动的目标轨迹，该轨迹使辅助轴承与转子的轨道同步。同步之后，将平滑过渡到触点。因此，取决于转子的偏转，相对速度被最小化。在第二控制阶段（接触期间），确定目标轨迹，该轨迹以低接触力保持永久接触并产生同步的完全环形摩擦状态。此外，控制器始终确保转子的挠度不超过辅助轴承的初始气隙，从而牢记通用目的-挠度的限制。执行器的反馈控制基于反馈线性化，可确保在可能的接触力和冲击的整个范围内对辅助轴承进行准确而稳健的运动控制。在辅助轴承位置处垂直于转子的平面中，测量转子和辅助轴承的位移。仅这些信号用于控制器。在试验台上，已经通过实验研究了主动辅助轴承的性能。各种实验表明控制策略的成功。通过使用建议的控制系统，接触力降低了90％，转子的挠度也大大降低。

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