Dry-type Air Core Reactormodel Structure Seismic Responsesemi-active Control Experimental Research

The power system is an important part of the national lifeline engineering.Once destroyed in the earthquake,it will not only cause huge economic losses,but also lead to secondary disasters,which will increase the difficulty of rescue work after the earthquake.The reactor is the main part of the power of lifeline engineering,its structure is a typical "top-heavy" support structure and supporting structure will produce two times the dynamic amplification effect,the system is close to the natural frequency of the structure compared with the predominant frequency of seismic wave,easy to produce resonance problem.The development of structure control theory provides new ideas and new methods for disaster prevention and mitigation engineering structure,it will rely on the traditional structure system,passive stiffness to the seismic bearing capacity of changing the way the semiactive / active control direction,can effectively reduce the seismic response of the key parts of the structure.In this paper,the model structure of 10 kV dry type air reactor is studied.The main contents are as follows:(1)At present,most of the earthquake resistant problems of engineering structures can be transformed into numerical optimization analysis.The traditional single optimization method has great limitations,and it is difficult to obtain the optimal solution and satisfactory solution.To solve this problem,this paper proposes an adaptive hybrid immune clone algorithm,introduced the cloning and immune memory unit,the optimization ability is far better than the genetic algorithm,and through the complex function tests show that the proposed algorithm not only does not appear the phenomenon of premature convergence,and optimizing capability is greatly enhanced in local and global that provides a theoretical support for the optimization development of active and semi-active control systems.(2)The electrostrictive properties of piezoelectric materials "special",through the reasonable design and construction,developed a piezoelectric friction semi-active control device,and through the experimental analysis of the different piezoelectric stack and the number of different input voltage,the semi-active control device performance and damping principle.The research results show that the piezoelectric / friction semi-active control device developed in this paper has stable and reliable output / output performance and obvious effect,and it can be used for semi-active vibration control of reactor model structure.(3)Design a similar ratio of 1/2 10 kV reactor model and finite element model analysis of the structure,the input of the artificial earthquake wave,studied in model structure with or without control of the failure pattern,displacement response and stress variation of insulators,and simulated earthquake the shaking table test model of the structure under various conditions.Finite element analysis and test results show that the maximum seismic response of model structure on insulators,as the weak link of earthquake damage of reactor structure,but equipped with piezoelectric friction semi-active control system,a control displacement reactor model structural response control is reduced about 20%,the seismic insulator the response is reduced by 56%,show R & D semi-active control system can effectively reduce the reactor engineering structure seismic response,relatively broad application prospects.(4)The traditional BP neural network has many disadvantages in the initial weight / threshold selection.The adaptive hybrid immune algorithm is used to optimize the BP neural network model.It can search the best initial weight / threshold,making the neural network error after training minimal.In this paper,the optimized BP neural network model is applied to the shaking table test and analysis of semi-active control system and 10 kV dry air reactor model structure.The displacement and acceleration responses of the model without control and controlled time are compared.The results show that the BP neural network model based on the optimized settings,compared with semi-active control system of 10 kV reactor model structure and without control,the maximal interlaminar displacement response of the damping rate of about 64%,the maximum acceleration response of the interlayer damping rate of about 60%,after the test found no damage occurred in the model structure,description seismic reliability of reactor model structure has been improved.The results obtained in this paper can provide reference for the research and application of vibration control of engineering structure top-heavy ",have certain popularization and application value.