In order to minimize the mass and optimize the dynamic performance of the sealed cowling for a magnetic bearing reaction flywheel

the optimum design method for sealed cowling structure is researched. The Finite Element Models(FEM) for the sealed cowling of two outline design schemes are established based on the FEM theory. The static intensity in one of the sealed cowlings is analyzed

and the stability of each sealed cowling to contract compressive stress is analyzed using an eigenvalue buckling technique. Then the two design schemes are compared each other

the optimum design of variable parameter outline is obtained.The effects of two key outline parameters and the thickness of the shell on the whole performance of the sealed cowling are analyzed

the results show that the optimum design scheme is in the shell mass of 0.197 kg

and the stability coefficient of 5.374. The method improves the reliability and efficiency of sealed cowling design

and has important significance in optimization design of the flywheel system.