Research on mechanics and dynamics of MW-level large energy storage flywheel shafting
Current research on high-power,large-capacity flywheel energy storage systems remains insufficient.This study focuses on a newly developed prototype of a MW/100 MJ flywheel.We analyzed the structural mechanics of both built-in and surface-mounted flywheel motor rotors,assessed the impact of different dynamic balance block materials on stress and deformation,and performed a dynamic characteristics analysis of the shaft system.Experimental validation of the flywheel prototype was conducted to ascertain system stability.Findings from numerical calculations suggest that the surface-mounted design substantially reduces stress on the silicon steel sheet,although this configuration typically necessitates a carbon fiber reinforced layer to prevent the magnetic steel from detaching from the silicon steel sheet under centrifugal forces during operation.Stress values increased by over 45%when using stainless steel for the dynamic balance block compared to aluminum alloy.The shaft system's dynamic analysis revealed two rigid vibration modes at operational speeds of 1300 r/min and 4200 r/min,corresponding to translational and conical movements,respectively.Experimental observations confirmed a peak vibration at 1300 r/min,corroborating the numerical simulations.However,the anticipated critical speed(conical motion)at 4200 r/min did not manifest as a significant peak in actual tests,indicating that translational vibration modes are more prone to excitation in this shaft configuration.
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