变阻尼混合质量阻尼器控制系统研究

Research on variable damping hybrid mass damper control system

针对强风作用下直线电机驱动的混合质量阻尼器(HMD)控制系统出现控制力输出或质量块冲程过大的问题,提出了变阻尼混合质量阻尼器(VD-HMD)控制系统,该控制系统是通过将HMD中的固定阻尼单元替换为变阻尼单元而构成。通过对LQG控制算法中的二次型泛函修正,采用遗传算法对其权重矩阵进行优化。以广州塔为算例进行降阶的主动和被动VD-HMD控制系统的仿真,并进行对比分析。结果表明:基于直线电机驱动的HMD控制系统改进的VD-HMD控制系统对结构控制有效;10年重现期风荷载作用下,VD-HMD控制系统的减振控制效果相比HMD控制系统的有较大提升;相比于HMD控制系统,主动和被动VD-HMD控制系统在整体楼层平均加速度控制中效果提升明显,分别提高约10%和5%;所提出的控制系统可以降低控制装置的物理尺度,并能减少直线电机控制力的输出,保证变阻尼控制的连续性。

Aiming at the problem of excessive control force output or mass stroke in the hybrid mass damper(HMD)control system driven by linear motor under strong wind,a variable damping hybrid mass damper(VD-HMD)control system is proposed by replacing the fixed damping unit in HMD with the variable damping unit.The quadratic functional in LQG control algorithm is modified,and its weight matrix is optimized by genetic algorithm.Taking Candon tower as an example,the reduced order active and passive VD-HMD control systems are simulated and compared.The results show that the improved VD-HMD control system based on HMD driven by linear motor is effective.Under the wind load of 10-year return period,the vibration reduction control effect of VD-HMD control system is improved compared with that of HMD control system.Compared with HMD control system,the control effect of active and passive VD-HMD control system in average acceleration control of the overall floor is significantly improved,about 10%and 5%,respectively.The proposed control system can reduce the physical scale of the control device,reduce the output of the linear motor control force,and ensure the continuity of variable damping control.