Deployment Analysis And Simulation Of Hoop Truss Deployable Antenna

With the rapid development of space navigation, satellite antenna has been requested more. Such as, bigger caliber, more precision, lighter mass and higher rigidity etc. Because the means delivering antenna to space is restricted in weght and volume, it's demanded that the big satellite antennas are deployable. The structure of hoop truss deployable antenna has lots of advantages such as flexible, good heat stability, less contract volume and simpler structure than other etc, so some countries laid a strong emphasis on its research. Its main characteristic is that the deployable antenna has complex structure and simple geometry shape of parts. It's very important to do research of deployable process anlysis and simulation of circular truss deployable antenna.Based on the structural characteristics of the hoop truss deployable space mechanism, the motion transformation relation between two hoop modules is given using the method of coordinate transformation. The general model of deployment kinematic analysis is established. The model can be applied to carrying out the position, velocity and acceleration analysis of any point on the structure. In order to avoid too large impact in the deployable process, the deployment velocity is planned.Based on Lagrange method in multibody dynamics systems, using absolute generalized coordinates, the dynamics modeling for the hoop truss deployable antenna is established while the dissipative force, torque of torsional spring in hinges and the pre-tension forces in cables are considered. The force-controlled method is presented to control the deployment motion, the relation between the driving force and the deployment motion is derived. The variation of the driving force is obtained according to the planned deployment motion. The deployment dynamic of a hoop truss deployable antenna is simulated, and the effects of initial velocity, damp and gravity upon deployment are summarized. The deployment dynamic analysis and control of hoop truss deployable antenna are carried out taking the stiffness of torsional spring, damp in hinges, gravity and the pre-tension forces in cables into account.A feasible approach to deployable process analysis and simulation of circular truss deployable antenna was proposed based on the virtual prototype technology. The parameterized modeling technology is applied to build parameterized models with VC++ and CMD language in ADAMS, the finite element analysis software is applied to create flexible body models for the parts through modal analysis, and the mechanical system dynamics analysis software platform ADAMS is applied to generate a system model through assembling all models. The presented development steps and examples validated the feasibility of the approach.