Research Of Cycle-Driven Space Telescopic Masts

The stretching rib antenna is a kind of umbrella antenna with special structures.The supporting ribs can be folded together,and the ribs itself can be folded and stretched.As a result,the stretching rib antenna has a higher storage ratio and has become a hot topic in the research of the extremely large and super large space antennas.In this paper,a telescopic mast applied to the supporting ribs of the stretching rib antenna is proposed.The telescopic mast has the characteristics of reciprocating driving,which helps to improve the drive efficiency of the mechanism.The design and research of the masts are accomplished systematically.The envelope and dynamic design are emphasized and accomplished,by means of the structural design of the mast,the kinematic planning and simulation,the dynamic analysis and design,as well as the analysis and simulation of the structural characteristics.The main contents of the research are as follows:1)The current different types of space deployable masts at home and abroad are summarized and analyzed.It is concluded that the telescopic mast can be applied to the stretching rib antenna.Based on the current researches of the telescopic masts,a cyclically-driven type is designed.2)The working mode of the new-type mast is analyzed.The structures of the driving module,the extension module and the locking mechanism are designed and analyzed respectively.The structures of the specific components are designed.Based on it,the design of the 5-meter engineering prototype is accomplished,and the 3D model is printed.3)The kinematic planning and transmission issues are solved based on the Envelope Theory.The kinematic planning is made by assuming the gear ratio.The motion trajectory equations are solved based on the spatial coordinate transformation.The envelope bus of the transmission hole is calculated according to the Envelope Theory.The numerical simulation and verification are made by using the MATLAB.The numbers of the driving pins are analyzed.Finally,kinematics verification and analysis of the mast are made based on the ADAMS software.4)The dynamic design is made based on the space rigid body dynamics.Rigid body dynamic differential equations are established based on the spatial composite motion principle and rigid body dynamics.The dynamic results are solved,and the design of the motor is completed.5)Based on the finite element method,the structural characteristics of the mast are analyzed,including statics and dynamics analysis.The statics simulation is the strain and stress analysis of the single mast and the fully extended masts,in order to ensure the structural strength;the structural dynamics simulation is a modal analysis of the mast when folded and fully extended.The research on the mast in this paper shows that the structure of the cyclically-driven telescopic masts is concise and the principle is clear,which can meet the structural requirements of the support ribs of the extended rib antenna.