Enhancing active vibration control of pedestrian structures using inertial actuators with local feedback control
Enhancing active vibration control of pedestrian structures using inertial actuators with local feedback control
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DOI：
10.1016/j.engstruct.2012.03.043
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发表时间：
2012-08
影响因子：
5.5
通讯作者：
I. M. Díaz;E. Pereira;M. J. Hudson;P. Reynolds
中科院分区：
文献类型：
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作者：
I. M. Díaz;E. Pereira;M. J. Hudson;P. Reynolds
基于惯性致动器的振动主动控制技术被认为是缓解土木工程结构过度振动的一种可行技术。特别是，最近的几项现场试验表明，这种技术有可能有效地消除行人结构中人类诱导的振动。然而，在使用惯性执行器实现AVC之前，必须解决几个缺点。主要的缺点来自于用于这种应用的惯性执行器的动态特性，即：(I)其低频动态(可能与结构动力学相互作用)，以及(Ii)其非线性(行程和力饱和)。因此，任何要实现的控制技术都必须解决稳定性问题(由执行器的低频响应引起)以及行程和力饱和，这可能导致较差的减振性能。为了缓解这些缺点，本工作提出使用基于两个控制回路的AVC策略：(I)闭合在执行器内的回路，其被设计为根据其最大行程和力以及结构动力学来人为地修改执行器的频率响应，以及(Ii)被设计为向结构提供减振的回路。本文重点研究了AVC系统基于速度反馈时，考虑稳定性和执行器饱和的设计过程，以提高给定惯性执行器的效率。给出了使用商用执行器的全尺寸混凝土实验室结构的实验结果，以说明所提出的AVC策略的性能，该策略在不需要硬件修改的情况下确保了对给定结构的适应性。
Active vibration control (AVC) via inertial actuators is considered a viable technique for the mitigation of excessive vibrations in civil engineering structures. In particular, several recent field trials have shown that this technique has the potential to be effective for the cancellation of human-induced vibrations in pedestrian structures. However, prior to the implementation of AVC using inertial actuators, several drawbacks have to be dealt with. The main disadvantages come from the dynamic behaviour of the inertial actuators employed for this application, which are: (i) their low frequency dynamics (that might interact with the structure dynamics), and (ii) their nonlinearities (stroke and force saturation). Thus, any control technique to be implemented has to tackle stability problems (caused by the low frequency response of the actuators) and stroke and force saturation, which might lead to poor vibration cancellation performance. To alleviate such drawbacks, this work proposes to use an AVC strategy based on two control loops: (i) a loop, closed within the actuator, designed to artificially modify the actuator frequency response according to its maximum stroke and force and the structure dynamics, and (ii) a loop designed to impart damping to the structure. This work focuses on the design process such that stability and actuator saturations are taken into account to improve the efficiency of a given inertial actuator when the AVC system is based upon velocity feedback. Experimental results on a full-scale concrete laboratory structure using a commercial actuator are presented to illustrate the performance of the AVC strategy proposed, which ensures adaptability to a given structure without requiring hardware modifications.