Structure Optimization Analysis For The Rotor System Of Flywheel Energy Storage System

Along with the focus on energy efficiency and reducing energy waste,flywheel energy storage as a relatively new way of clean energy storage has been get more and more attention by the researchers in the energy industry.As the 600 Wh energy storage flywheel prototype design for the research background,this research focused on optimization analysis for energy storage flywheel rotorg system,including the optimization of the shaft structure layout based on the distribution of critical speed and the structure of the flywheel based on improving the energy density for the main energy storage components.And the test was carried out to verify the correctness of the conclusion.According to the design requirements of 600 Wh energy storage flywheel system,the bearing characteristic of the electromagnetic bearing was analyzed to gain the main structure and control parameters of electromagnetic bearing.Based on the analysis,the equivalent stiffness and equivalent damping range of magnetic bearing was analyzed.Besides,finite element method was used to analyze the distribution of the critical speed of rotor system.And the rotor critical speed distribution of initial design condition was gain.According to the specific circumstances of the critical speed distribution of initial design condition,the structure of the rotor system was optimized through with the genetic algorithm to adjust the distribution of the critical speed.Based on the sensitivity method,the optimized structure parameters ware gained,including the length of the rotating shaft,diameter.Besides,the design variable,objective function and constraint conditions on the genetic algorithm ware analyzed to establish a mathematical model of optimization problems.Finally,the reasonable structure parameters ware attained by the genetic algorithm,and the modal analysis of the optimized rotor was carried out.The aluminum alloy flywheel of umbrella structure was optimized to improve the flywheel energy storage density.Firstly,storage index of 600 Wh flywheel energy storage test prototype was analyzed to gain the relationship between the design height and radius of flywheel and the formula of the stress distribution.Baesd the optimal control principle,the mathematical model of flywheel optimization was established to get the structure parameters of aluminum alloy flywheel with umbrella structure.The safeware ANSYS was used to analyze strength of the flywheel for the strength requirement.The experimental analyze based on the prototype of 600 Wh flywheel energy storage system has been carried out in the laboratory.The specific circumstances of the prototype ware introduced and the theoretical analysis has been validated by the test.The test results wad analyzed to get the actual distribution of critical speed.Based on the analysis,the modify advices awording some problems of the prototype have been put forward to provide the reference for the design of flywheel energy storage system.