Optimal Design Of Mechaincal Structure For Blade Of 600kW Tidal Current Turbine

With the development of human beings,the demand for energy is increasing.As a renewable energy,tidal energy has a high value,has received great attention in the background of the shortage of global resources.The key components of the blade current can be converted,but the blade is in a harsh environment,the load is complex and changeable,and it is easy to corrode,destroy and break.The hydrodynamic shape of blade determines the efficiency of energy conversion,and the mechanical structure and layer design of blade determine the stiffness and strength of blade.In this paper,the mechanical structure of the blade of 600 k W power generating set is investigated to obtain the optimal mechanical structure of the blade.The research contents of each chapter of the paper are as follows:The first chapter introduces the research status of power generation equipment at home and abroad,and introduces the research status of blade mechanical structure of power flow units.The second chapter expounds the basic theory of blade design,including the theory of blade load calculation-the principle of leaf element momentum theory,the introduction of composite laminates and the rules of strength analysis and modal analysis,and the optimal introduction of the problem definition of multi-objective optimization algorithm,the selection of optimization solution set,the genetic algorithm and the multi-objective evolution algorithm NSGA-II.The third chapter designs the basic mechanical structure of the blade.The ultimate load of blade is solved by using Bladed software based on leaf element momentum theory,the batch processing method of Bladed software working condition is expounded,and the material of blade layer is selected and explained.then the section form of the blade and the blade root connection mode are selected and designed,and the number of bolts at the blade root is calculated.finally,the thickness of the main beam cap,the root reinforcement layer and the shear-resistant web are calculated by using the empirical formula according to the result of the ultimate load.the layer change of the blade spreading direction is designed.In the fourth chapter,the multi-objective optimization algorithm is used to optimize the layer structure of the blade.the two extended packages of pyansys and Geatpy are introduced and used for blade modeling and optimization;the multi-objective optimization of the blade is conditionally limited and the result set of the final optimization is analyzed.The fifth chapter mainly carries on the simulation and the analysis to the previous design scheme.firstly,the apdl command flow is used to simulate the blade structure and layer laying to verify the performance of the blade obtained by the empirical design method;then the simulation verifies the scheme results in the multi-objective optimization algorithm;finally,the optimal scheme is selected according to the loss function of the design.The sixth chapter summarizes the work of the thesis and looks forward to the subsequent design of the subject.