新型主动变刚度阻尼器的滑动模态控制及仿真分析

Sliding Mode Control of a New Active Variable Stiffness System

设计出一种新型主动变刚度阻尼装置,该装置可向受控结构提供两种等效刚度,使受控结构能主动地避开地震动卓越频率而永远处于非共振的状态。基于变结构控制理论的滑动模态控制算法,推导了该新型阻尼器的两种开关控制律。仿真分析结果表明,这种新型主动变刚度阻尼器的减震效果是非常明显的,可取得明显优于被动控制的减震效果。两种控制律中,连续型滑动模态控制律可以更充分地发挥该新型阻尼器的性能,取得更好的控制效果。

In this paper, we propose a new semi-active variable stiffness damper （NAVSD）, which offers two stiffness to the controlled structure and can keep the structure in nonresonant condition. The sliding mode control algorithm in variable structural control theory is employed to derive both control laws of the NAVSD. The results of numerical simulation show that the NAVSD is very effective in attenuating the structural vibration for a set of earthquakes, and outperforms its passive counterpart. The continuous sliding mode control law can achieve a better performance than the discrete sliding mode control law. The NAVSD is an economical, reliable and effective control device with a good prospect of engineering application in the near future.