基于SMA-压电阻尼器的巨-子结构智能控制

Smart control of mega-sub structure based on SMA-piezoelectric damper

针对巨-子结构体系,提出在巨-子结构间设置柔性隔震层,并增设一种SMA-压电复合智能阻尼器,形成巨-子结构智能控制体系,可有效改善巨-子结构的抗震安全性。介绍了SMA-压电阻尼器的工作原理与力学模型,建立了巨-子结构体系智能控制体系的分析模型,在此基础上构建了巨-子结构智能控制体系的运动方程。基于限界Hrovat最优控制算法和H2/LQG算法设计了巨-子结构智能控制体系的半主动控制器,进行了Simulink控制效果仿真分析,并与传统抗震,被动隔震,SMA-压电阻尼器的Passive-on、Passive-off控制和理论最优的主动隔震控制策略进行了系统的对比研究。仿真分析结果表明,SMA-压电阻尼器实施智能隔震控制时可兼顾主结构与子结构的控制效果,其控制效果与主动控制时接近,远优于被动控制策略。所提出的巨-子结构智能控制体系可望应用于实际工程中,并取得较好的经济和社会效益。

This paper proposes a novel smart mega-sub control system, in which seismic isolators are inserted be- tween the mega-structure and sub-structure, and a SMA-piezoelectric composite intelligent damper is installed in the isolation layer to enhance the safety of mega-sub structure system. The working principle and mechanical model of this SMA- Piezoelectric damper was presented. The analytical model of the smart mega-sub control system was built, and the governing equation of the smart Mega-sub control system was established. An H2/LQG control algo- rithm was used for primary controller design, and clipped Hrovat algorithm was employed for semi-active controller design. Numerical simulation of different controllers for the mega-sub control system were carried out within the en- vironment of Simulink and compared systematically. Results show that the semi-active control strategy can achieve very similar performance to the pure active case, and outperforms the passive control strategies. The proposed smart mega-sub control system based on SMA-piezoelectric damper may achieve good economic and social benefits , which is of practical significances and good application prospect.