Comparison and finite-element analysis of energy-storage characteristics of flywheel rotors with different materials
Currently,the flywheel energy-storage systems attract extensive attention due to their advantages of fast response speed and high power density.In this article,in order to analyze the difference among the flywheel rotors with different materials,the titanium alloy,the 4340 alloy steel,and the epoxy resin-carbon fiber composite materials are explored.The maximum rota-tional speed that the flywheel can withstand is analyzed with the help of the finite-element software ANSYS Workbench,and both the energy-storage density and the energy-storage amount of the flywheel rotors with different materials are compared.When the flywheels are running with the same rotational speed and size,the analysis is conducted on their internal stress and deformation.According to the data,as for the flywheel rotors with the same size,the flywheel featuring the epoxy resin-carbon fiber compos-ite materials can withstand the highest rotational speed;it has the largest energy-storage density as well as the smallest internal stress and deformation.The flywheel featuring the titanium alloy has the largest energy-storage amount.Although the flywheel fea-turing the 4340 alloy steel enjoys high energy storage,its internal stress and deformation are large,which will adversely affect the safety of flywheel operation.Therefore,the flywheels with different materials should be selected properly according to their char-acteristics in actual situations.
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