Theoretical Study Of Building Structural Vibration Decentralized Control Based On Fuzzy Control

The traditional structural vibration control algorithm usually need an accurate mathematical model,The structure of civil engineering is composed of structural member which is under stressed and non-structural member which is not.So it is hard to get model's actual parameters,the change of stiffness and mass in vibration have an influence on calculative results Researches on fuzzy control which don't depend on the precise model and can be simply adjusted is a hot issue in the development of structural vibration control.Centralized control in the traditional structure's vibration control is a single point,which means a controller's breakdown will lead to the failure of the whole control system.Structural system will be divided into several subsystems in decentralized control,each subsystem is independently controlled using local information,this can improve the stability of the control system.The paper aims at the building structural vibration control under seismic force,use fuzzy control algorithm and decentralized control strategy with MATLAB simulation calculation,mainly researches the following aspects of content:First,fuzzy logic control algorithm,decentralized control strategy and LQR overlapping decentralized control theory are analyzed theoretically.Second,for semi-active vibration control of high-rise buildings in seismic excitation,fuzzy logic control theory is introduced to solve the problem that accurate mathematical model of mechanics is necessary in traditional control algorithm.The fuzzy controller is designed for 20-storey Benchmark model with layer MR damper,and it considerates the MR damper's characteristics which can only output force that prevent structure's movement;the calculation results indicate the method can limit the displacement between layers.Third,for problems in centralized control of high-rise buildings in seismic excitation,logic and fuzzy control theory is introduced to 20-storey Benchmark model with direct drive actuators.The calculation results indicate that fuzzy decentralized control's effect is similar to LQR decentralized control's.Meanwhile it is verified that the fuzzy decentralized control has robustness when stiffness changes and the stability when sensor fails.Fourth,for structure's vibration control of multi-storey building in seismic excitation,a six-storey shear frame model is installed with interlayer drive and direct drive MR damper,and fuzzy logic controller is designed for it.The calculation results indicate that fuzzy control effect of displacement is good but the control effect of acceleration is poor when actuator is applied to each inter-story.The calculation results indicate that control effect of displacement and acceleration are good when building is installed with MR damper supported to the ground.The study also compares the control effect of open-loop and closed-loop and open-closed loop system.The paper's research results indicate that: fuzzy control effect of displacement is similar to LQR's,but the control effect of acceleration is poor when actuator is applied to each inter-story.Control effect of displacement and acceleration are both similar to LQR's when actuator is a direct type.Fuzzy decentralized control doesn't depend on accurate mathematic model,it overcomes the problem that centralized control is easy to fail and has good robustness and stability,so it is more practically significative.