Investigation of the dynamic stability of a capsule in multidisciplinary methods

A preliminary exploration on active control methods of an unsteady reentry capsule with multi-disciplinary research methods, including computational fluid dynamics, flight mechanics and control technology, was implemented. The active control process of the dynamic instability of the capsule was studied with a simplified two-jet attitude control system. The effects of different control methods were analyzed and compared. With the pole placement method, the state of the capsule could transfer from the limit cycle vibration to the trim state by selecting appropriate control parameters corresponding to the different control efficiencies. The time of the capsule changing the limit cycle vibration and reaching a trim state, the deviation between the pitch angle and the equilibrium position and the maximum total pressure of the jet changed with different control parameters.