Truss Bridge Structure System Based On GMM Active Optimal Control Research

Bridge structure system is the basic of economic survival and development of traffic facilities,if bridge structures have been destroyed,which failed to stand the test of earthquake,the destroyed bridges will not only bring immeasurable social losses,but also serious disorder relief system,that making reconstruction difficult.So this article on how to improve the seismic behavior of the bridge structure system,to ensure its safety and reliability in under the action of earthquake were studied.First of all,based on the physical and mechanical properties of the Giant Magnetostrictive Material-GMM,we can form the actuator components in order to control the structure seismic response,obtained by the experiment of actuator current drive constitutive model,According to the basic principles of active control to obtain the desired control input current.This article choose the structure of the truss bridge as the research object,which not only can be completed in a short time but also can alleviate the pressure of urban traffic and meet the requirements of overload transportation system.In this paper,we use the large general finite element analysis software ANSYS to modeling of the study,which can output of the structure of the mass and stiffness matrix M matrix K,then set up the structure of the dynamic equation and transform it into a state space model.Secondly,based on genetic algorithm to optimization GMM actuator's numbers of layout arrangement position and arrangement position,proposed the GMM actuator configured to optimize performance and fitness function in the active seismic control process of the structure,establish the mathematical model.Using MATLAB software for programming the fitness function and combined with MATLAB genetic algorithm toolbox for optimization analysis.According to the general applicability and breadth of classical linear optimal control,using MATLAB to programming of LQR control algorithm,and analysis the steel truss bridge structure's dynamic response under various working condition.The analysis result shows that using genetic algorithm to optimal allocation of actuators for active structural seismic control is effective.Finally,according to sliding mode variable structure control principle,using MATLAB to programming the sliding mode control algorithm.It still use the truss bridge structure as a model object,and the 20 GMM actuator arranged optimization results to analysis the different conditions of structural dynamic response that under EI-Center waves and waves of Nanjing.The results proved that the structure of the nodes displacement controlled state there was a clear improvement over the displacement uncontrolled state,and which reflects the reliability and efficiency of the sliding mode control algorithm.