基于磁致伸缩作动器的斜拉桥桥面系振动主动控制系统设计

Design of an Active Vibration Control System for Cable-Stayed Bridge Deck Systems Based on Magnetostrictive Actuators

摘要:

针对斜拉桥桥面系在风、车辆荷载和地震作用下的振动，以及磁致伸缩作动器存在时滞和输出效能波动的问题，设计了振动主动控制系统。系统采用光电编码器和转矩传感器获取位移与控制力反馈，在桥面系降阶模型基础上联合估计等效时滞和作动器效能，预测控制力实际作用时刻的模态状态，并对驱动指令施加幅值、变化率和非注能约束。试验结果表明，该系统能够适应控制时滞和输出能力变化，有效抑制桥面系振动。

Abstract:

An active vibration control system is proposed for the bridge deck of a cable-stayed bridge subjected to wind, traffic, and seismic excitations, considering the effects of time delay and varying output effectiveness of magnetostrictive actuators. Optical encoders and torque sensors provide displacement and control force feedback. A reduced-order bridge deck model is employed to jointly estimate the equivalent time delay and actuator effectiveness, enabling prediction of the modal states at the actual control force application instant. Control commands are constrained by amplitude, rate-of-change, and passivity (non-energy-injection) requirements. Experimental results show that the proposed system effectively accommodates variations in control delay and actuator performance, achieving significant vibration suppression of the bridge deck.