The Active Control Of Spherical Reticulated Shell Under Wind Excitation

As one of typical truss structure, spherical reticulated shell structure havereasonable stress characteristics; beautiful structural style；and large spanning ability,making it in favor of contemporary architects, so it is widely used in the airport, trainstation, gymnasium, exhibition center and other large gatherings. But because of thelow stiffness、small damping of this kind of structure, it will be greatly destoryedunder the effection of wind load, so the method which can be adopted to reduce thewind vibration damage of the structural is very important. Based on the structure ofspherical shell,this paper researched the effect of the active control system in reducingthe wind vibration response of the reticulated shell structures by the method ofnumerical analysis, the main work of this paper include the following aspects：（1）This paper analysised some basic properties of wind load, writ relactiveMATLAB program with the method of linear filter, and simulated fluctuating windspeed for each node in the spherical reticulated shells, and generated correspondingwind load schedule.（2）This paper researched the composition of the active air control system of thespherical Tennis structure and the controlling position matrix establishing method ofstructure integrated actuator have been deduced.（3）This paper established state-space model based on the modern control theory,analysised the basic principles of the linear quadratic classic optimal control law, andwrite its active control algorithm, simulated wind vibration active control of SphericalReticulated Shell, got wind vibration response of the structure without control and under controll.（4）Took quadratic performance functional as optimization criteria, this paperoptimizated the location of actuator in Spherical Reticulated Shell with the geneticalgorithm toolbox in MATLAB software. The result shows that optimizating theactuator with genetic algorithm can improve the efficiency of the optimization, andensure the overall optimization of the structure. By the control effect coefficient in thetext, we can determine the number of actuators in Spherical Reticulated Shell, shows thecorrectness of quadratic performance functional,the validity and applicability of geneticalgorithm.According to the analysis of this paper, by using linear quadratic-type optimalcontrol algorithm, the effect of active control to the wind vibration response ofSpherical Reticulated Shell is obvious, actuators wiht reasonable number, and positioncan also play a good control effect, reaching rontrol purposes. Plays a positive role ininhibition of wind vibration response of spherical reticulated shell, promots theapplication of active control system in the internship project.