| The power transmission tower is a highly flexible structure, and the dynamic actionof wind loads and earthquakes are more sensitive, easy to have a greater dynamicresponse. The application of smart materials research and design active control systemand power transmission tower structure vibration control, can effectively inhibit thedynamic response of the structure to reduce the structural damage accumulation, andimprove the safety and reliability of the structure, and compare with passive andsemi-active control more flexible, smart, efficient, and adaptable.On the basis of existing research results to the North China Power Grid110kVtypical design of power transmission tower structure for the study, its core componentsfor GMM actuator based on giant magnetostrictive material (Giant MagnetostrictiveMaterial-GMM) with unique physical and mechanical performance has been developed,which is suitable for power transmission tower structural vibration active control.Meanwhile the GMM optimization of active control system in the power transmissiontower structure layout method was discussed, and active control effect was inspected.The content of the work and research are as follows:(1) Using ANSYS finite element analysis software, reasonable to simplify thepower transmission tower structure, a finite element model for the North China PowerGrid110kV power transmission tower structure in a typical design was established andthe finite model was analysed. studying these the dynamic characteristics of thestructure, and the proceeds of the first vibration cycle with the existing specificationformula calculation results were compared with in good agreement, and indicated thatthe text of the simplified calculation model was more reasonable and the income calculation results were reliable.(2) On the basis of theoretical analysis, the deformation mechanism and magnetroncharacteristics of the GMM, and the GMM actuator works and construction methodswere developed, meanwhile the GMM actuator and its magnetic properties were tested.GMM actuator drive structure, magnetic structure, pre-pressure and temperature controlactuator performance were optimizated. the different pre-stress GMM actuator outputperformance and drive current relationship were analysed, and the correspondingtheoretical analysis and computational models were established. The results shownthat the R&D GMM actuator magnetic high conversion efficiency, good performanceof driver, can be used for power transmission tower structural vibration active control.(3) The basic principles of active vibration control for the power transmissiontower structure was analyed to study the composition of the GMM active control systemand construction methods as well as the integration of high-power transmission towerstructure. the power transmission tower structural vibration control, the dynamic finiteelement equations and the structure of the state space model were established under thepower transmission tower structural vibration control. the application of GMM activecontrol system for the realization of such active structural vibration control wasexplored.(4) Based on genetic algorithm, fitness function is witted by MATLAB. Thisoptimization is achieved by MATLAB’s GADS toolbox.The simulation results verifythat the active control effect is obvious.LQR active control algorithm by the MATLABis used to carry on the active control simulation analysis to the power transmissiontower structure. The results prove that using genetic algorithm to optimize the actuatorposition is more accurate. The dynamic simulation analysis of the power transmissiontower structure is done by LQR active control algorithm. The effectiveness of geneticalgorithm to actuator layout optimization is verified by comparing the controlperformance and safety coefficient in different conditions. Results show that, the activeseismic control method and the corresponding active seismic control system can easilycontrol model of seismic response of the structure. The control effect can reach morethan35%generally. |
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