Optimal Design Of Dynamic Disaster Active Control On Spatial Span Structures

With the progress of technology and the development of economy, the research and application of spatial span structures have greatly widespread, and have been developing rapidly. Span and height of the building are constantly increasing, the form of structures become more complex. If architectural structure is designed in traditional way, the civil engineering structures had been easily destroyed in the strong earthquakes and strong winds. Actuator which based on intelligent materials installed in the appropriate place in civil engineering structures and control structure initiative. Active control can effectively reduce the dynamic response and damage accumulation as well as improve performance of anti-seismic.This thesis aims to study and produces a kind of actuator which based on giant magnetostrictive materials as the main component and discusses the GMM actuator's principle and optimal design method. This paper discusses the optimal placement method of actuator in the structure and verifies control effect active control optimized. Main tasks are as follows:1. This thesis studies the GMM's deformation mechanism magnetic characteristics. On this basis, a better performance of the GMM actuator is designed and produced, its magnetic properties are tested. According to the experimental results, the relationship between output displacement, output force and current are analyzed and summarized.2. This thesis uses genetic algorithm to optimize the position of actuator, and uses MATLAB to write fitness function. This optimization is achieved by MATLAB's GADS Toolbox. At the same time of improving the computational efficiency of optimization design, GA also achieves the overall optimization of the structure.3. Finally, in this paper, the MATLAB's SIMULINK toolbox is used to test the effectiveness of optimization and active control. The effectiveness of genetic algorithm to actuator layout optimization is verified by comparing the control performance in different conditions. The results show that active control with GMM actuators is feasible and the control effect of structural displacement can reach as much as 50%.