基于多级模糊控制的半主动隔震结构减震研究

摘要

A new type of fuzzy control controller designed for seismic protection of a base-isolated building with a piezoelectric friction damper was presented here.The controller adopted a multi-level fuzzy control algorithm.The sub-level fuzzy controller was designed to determine the command voltage of the piezoelectric friction damper with inputs of velocity and displacement of base floor.With the input of seismic acceleration,the high-level fuzzy controller adjusted quantization factor and scaling factor of the sub-level fuzzy controller in real-time.The effectiveness of the proposed multi-level fuzzy controller was verified through numerical simulation of a base-isolated structure.The simulation results were compared with those with the traditional fuzzy controller and the passive controller.Numerical results show that the proposed multi-level fuzzy controller can successfully mitigate the displacement of the base floor and the superstructure acceleration response of the structure,and has a good adaptability to ground motions with different intensities.%提出了一种基于压电摩擦阻尼器的新型模糊控制器，对其在半主动隔震结构中的减震效果进行研究。该控制器引入多级式模糊控制策略，其中次级模糊控制器以隔震层的速度和位移为输入，以阻尼器的电压为输出；高级模糊控制器以地震动加速度为输入，实时调整次级模糊控制的量化因子及比例因子。为检验多级模糊控制方法的有效性，对一隔震结构进行数值模拟，并与被动控制和普通模糊控制的减震效果进行对比。数值结果表明：该方法能有效地降低隔震结构的基底位移和上部结构的加速度响应，并且对不同强度的地震动具有良好的适应性。