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首页> 外文会议>ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference 2007 >VIBRATION CONTROL OF COMPOSITE BEAMS USING ADAPTIVE POSITIVE POSITION FEEDBACK
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VIBRATION CONTROL OF COMPOSITE BEAMS USING ADAPTIVE POSITIVE POSITION FEEDBACK

机译：基于自适应正位置反馈的复合梁振动控制

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摘要

This paper presents a new method of active vibration control (AVC) of flexible composite cantilever beams. A recursive least mean squares (LMS) based filter is used to perform on-line system identification, updating a positive position feedback (PPF) controller in real-time. With conventional time-invariant PPF control the damping ratio and natural frequency are selected based on the structural response, with the feedback path taking the form of a second-order filter; therefore having performed an off-line system identification of the plant dynamics, this controller is relatively straightforward to implement. Some structures undergo parameter changes over time and actuation in the control sequence can contribute to this change in the system dynamics. PPF control is optimized when an accurate estimation of the natural frequency is available. It is demonstrated that the recursive LMS algorithm can be used to provide a continual on-line estimation of the plant dynamics, for robust control of a slender glass fiber beam. The result is an increase in vibration attenuation, which is robust to variations in the beam properties. It is shown that this controller delivers a high performance settling time when compared with the standard PPF controller for free vibration in the first mode. Robustness of the technique is further demonstrated by altering the fundamental frequency of the beam, via the addition of a lumped mass. The adaptive controller re-tunes itself to this parameter variation, ensuring a high level of vibration suppression is upheld.
机译：本文提出了一种新型的柔性复合悬臂梁主动振动控制方法。基于递归最小均方（LMS）的滤波器用于执行在线系统识别，实时更新正位置反馈（PPF）控制器。在传统的时不变PPF控制下，阻尼比和固有频率是根据结构响应来选择的，反馈路径采用二阶滤波器的形式。因此，在执行了工厂动态离线系统识别后，该控制器的实施相对简单。一些结构会随着时间而发生参数变化，并且控制序列中的致动会导致系统动态变化。当可以准确估计固有频率时，可以优化PPF控制。事实证明，递归LMS算法可用于提供对植物动态的连续在线估计，以可靠地控制细长的玻璃纤维束。结果是增加了振动衰减，这对于光束特性的变化是稳健的。结果表明，与用于第一模式下自由振动的标准PPF控制器相比，该控制器具有较高的建立时间。通过添加集总质量来更改光束的基本频率，进一步证明了该技术的鲁棒性。自适应控制器将自身重新调整为该参数变化，从而确保保持较高水平的振动抑制。

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