| The hoop truss antenna has received wide attention from related researchers since some of its advantages.The prerequisite to ensure the stable operation of the antenna during its service life is the smooth and complete deployment of the antenna in space without(micro)gravity.In order to make the deployment process in space smooth and better play the role of transmitting and receiving electromagnetic waves and information,dynamic analysis of the whole deployment process of hoop truss antenna must be performed.Research background of the space large deployable antenna was introduced.The structural composition,working principle and driving modes of the hoop truss antenna are briefly stated.Through the kinematics analysis,the kinematics model of the hoop truss during the deployment of the antenna is obtained,which lays a foundation for the deployment dynamic modeling of the hoop truss antenna.In order to analyze the deployment process of antenna cable net,the deployment model of antenna cable net is established according to the cable elements model,numbering of cable net and topological matrix.For solving the equations,the inverse motion deployment method is used,that is,from the fully deployed state to the fully stowed state.The relationship between the tension of cable elements,the elastic potential energy of the cable net and the deployment angular displacement can be obtained separately through analysis,which can simulate the deployment process of the cable net.Based on the second kind of Lagrange dynamic equation,the dynamic model of the hoop truss antenna is established considering the kinetic energy of the system,the elastic potential energy of the cable net,the gravitational potential energy and the dissipative energy of the system,and also considering the kinetic energy of overall diagonal rods that varies with the deployment angle of antenna.The deployment of the motor-driven antenna is achieved indirectly by pulling the driving rope in the diagonal rods of hoop truss antenna,so the research on the motor drive can be transformed into the research on the driving force of the driving rope.The accuracy of the dynamic model of this paper is proved by the comparison of three different deployment dynamic model of hoop truss antenna.According to the dynamic model,the forward dynamic analysis of the whole deployment process of hoop truss antenna was carried out based on the combination of torsion spring drive and motor drive.The influence of the relevant parameters of the torsion spring and the driving rope driving force on the deployment process of the antenna is studied,respectively.The research contents and conclusions can provide reference for the study of antenna deployment process and the selection of related parameters.The driving mode of hoop truss antenna is the combined drive of torsion spring and motor.Based on the motion equation of the electromechanical transmission system,the electromechanical integration model of the deployment process of the hoop truss antenna is established considering the motor model,antenna deployment dynamics model,drum model and driving rope model.The relationship between deployment angular displacement,deployment angular velocity,driving force of driving rope and deployment time of hoop truss antenna can be obtained separately by analysis,which can effectively simulate the actual deployment process of hoop truss antenna.The research method can provide necessary guidance for the in-depth analysis of hoop truss antenna. |
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