Shafting Structure Design And Modal Analysis For The Tester Of600Wh Energy Storage Flywheel

As a new energy storage way, the flywheel energy storage technology is not only high energy storage density,high power density,high efficiency of charge and discharge,and also simple maintenance,pollution-free,noiseless. So that the flywheel energy storage technology attracts lots of attention from energy industry, has a broad application prospect.This article through the shafting structure design and vibration analysis of the600Wh flywheel energy storage experiment prototype, providing a certain reference for the research and application of600Wh flywheel energy storage system.First of all, according to the energy storage requirements and basic performance requirements, we made the flywheel structure design optimization, including the design of the flywheel’s material, shape and size. We got two design schemes, by checking the flywheel strength of the two kinds of schemes, chose the appropriate design, then made parameters optimization calculation to the flywheel which met the strength requirement, finally got the optimum design of the flywheel.Secondly, we did the design of the overall arrangement of shafting according to the flywheel’s design parameters, moment of inertia, dynamic balance, etc., including the type selection of the motor, the layout of the support system, the type selection and life verification of the protecting bearing, the design and verification of the flywheel axle, etc.. Finally we completed the shafting structure’s holistic design of this flywheel energy storage tester.Again, we did the stress analysis and intensity check to the key parts of the energy storage device. We chose the finite element software ANSYS for stress analysis of the flywheel rotor, getting the flywheel’s stress distribution and the size of the principal stress data. We did the intensity check to the flywheel by the failure criterion of the fourth strength theory, the results conformed to the requirements. Then we did the statics analysis and intensity check using the ANSYS software, getting the maximum equivalent stress and the maximum shear stress of the shaft are both less than the allowable compressive strength of materials, this proved that the strength of the shaft also met application requirements.Finally, this paper introduces the main research content of rotor dynamics, calculation method and the modal analysis theory foundation. We did the rotor dynamics research by the finite element method, based on the shafting structure modal analysis of the energy storage device, we got the first ten order natural frequency and vibration mode, and analyzed the impact of each vibration mode to the plant operation. Then we used Matlab to verify the modal analysis results of ANSYS. In order to further determined the reliability of the shafting structure, we also did the modal analysis to the engine base of the flywheel energy storage device. We compared the difference of the natural frequency between the engine base and the shaft system, analyzed the conditions that may occur when the flywheel was in the process of acceleration and deceleration. The results showed that the engine base and the shafting structure would not happen resonance when the energy storage device was working. These proved the rationality of the shafting structure design, met the design requirements of energy storage device.