Design And Dynamics Research Of Aerospace Dual-input Reducer And Electromagnetic Brake

With the wide application of electric actuator in aerospace and other fields,the reliability and precise control requirements of actuator are increasingly strict.The single degree of freedom actuator has been unable to meet the higher reliability requirements.Redundant steering gear has become a trend of development.In this paper,the development of a micro double input planetary reducer is introduced in accordance with the technical requirements for the transmission device of a certain type of spacecraft.Aiming at the limitation of the structure of this reducer to the space volume,a disposable electromagnetic brake is designed,which is used to brake an input shaft for switching in the working state of the reducer.According to the design requirements of double input reducer,the gear transmission system is designed and calculated by mechanical design theory,and all parameters of each gear are determined,and the gear strength and bearing life are checked.The overall structure design of the reducer is completed.The 2D drawing and 3D modeling of the reducer are completed by CAXA and Pro/E,and the finite element analysis of the key parts is done.Based on the lumped parameter method,a dynamic model of gear transmission system is established.The natural frequency of the transmission system is solved by MATLAB,which is verfied by the finite element method.The modal analysis of complex parts is carried out by ANSYS,which provides a basis for avoiding system resonance.According to the limited space volume,disposable machine design concept is applied to the electromagnetic brake,The armature of which is designed by conical surface,the key parameters of the electromagnet are calculated,and the design of the electromagnetic brake is completed.The electromagnetic suction is verified by ANSYS,and the braking time of the brake is calculated,which lays the foundation for the fast response of the control.A rigid body dynamic model of the reducer is established,and the working state of the reducer is simulated.The ADAMS simulation is carried out,and the meshing force curve of the gear is obtained,which verifies the correctness of the theoretical calculation.The performance test of the reducer prototype is carried out,and the transmission accuracy,transmission efficiency and axial stiffness test rig are built.All the experimental tests are carried out,and the results are analyzed.The experimental results show that the performance of the reducer basically meets the requirements.