Optimization Design Of Friction And Slip Base Isolation System Based On Improved Genetic Algorithm

In recent years,the base isolation technology has been vigorously promoted.The optimization of isolation performance has also become an important part of the research on base isolation.The multi-objective optimization problem is in a very important position in the real life of science and engineering applications,and it is one of the most complex and urgent problems to be solved.How to effectively solve multi-objective optimization problems has also been the goal pursued by many scholars.In this paper,a sliding vibration isolator is taken as the research object,and the multi-objective optimization study of the friction-slip base-isolation structure under earthquake is carried out,which mainly includes the following three aspects:A friction-slip vibration isolator with a restoring device is proposed.By analyzing the restoring force model of the friction-sliding base-isolation system and the calculation model of the superstructure,the dynamic equation of the isolation layer and the dynamic equation of the superstructure were established.Combined with the structural control equations,the sliding isolation structure with the sliding isolator is modeled in Simulink environment.Under the MATLAB environment,the Simulink modeling structure was simulated under three different seismic waves,and the seismic response of the uncontrolled structure and friction-sliding base-isolated structure with each seismic wave was obtained.Obtain the top-level acceleration of the structure,displacement of the top layer,and the displacement of the isolation layer with the changing of the celected parameters of the isolator.Using a friction slip damper as the damping control device,a non-dominating genetic algorithm with an elite strategy called NSGA-? is applied to the multi-objective optimization study of the friction-slip base isolation device to obtain the optimal design parameters of the sliding friction damper with minimized seismic response of the isolated structure under the multi-objective optimization framework.Comparing the responses of the uncontrolled structure and the friction-sliding isolated structure before and after optim-ization under different seismic waves.