Analyses And Experimental Researches Of Deployment Process Of Deployable Planar Antenna Structure

As the development of information enterprise, there are larger and larger demandsof space mechanisms. As a kind of space mechanism, satellite planar antenna shouldhave the characteristics of high stiffness, high precision and high stability, so as to meetthe urgent demand of information and adapt to the severe space environment.Deployable planar antenna support structure is important to drive the antenna to deployand to maintain the position and stiffness of the antenna when it is in deployment state.The support structure is space truss structure with multi closed-loop, having complexassociation between bars and rigorous position constraint. To ensure that thedeployment of the planar antenna is reliable on orbit, full analysis and deployment testmust be carried out on the ground.From the perspective of degree of freedom, the multi-module space structure issimplified into single-module plane mechanism. Then the general model of deploymentkinematic analysis is established using closed-loop vector method, and the kinematicmodel includes single-loop model and multi-loop model. With the models the kinematiccharacteristics are obtained by programming, and the conditions of reaching singularityposition are given through comparative analysis of the angular velocity and the angularacceleration under different driving strategies.On the basis of kinematic analysis, the dynamic model for the deployable structureis established using the Lagrange Equation in multi-body dynamic system, which takesinto consideration gravity and driving forces of springs. Also, given the different drivingstrategies, the example analysis is conducted, and the impacts on driving torques duringthe deployment process of driving strategy, gravity and spring parameters are studied.Then, it’s convinced that springs do favor to the deployment.Combined with ADAMS simulation software, the three-dimensional parameterizedsimulation model of the deployable structure is established. Then kinematic simulationis conducted, which verifies the correctness of the theoretical analysis of kinematiccharacteristics and singularity position, and dynamic simulation is also carried out,which verifies the correctness of the theoretical dynamic model. Using simulationmodel, the impacts on driving torques during the deployment process of driving strategyand spring parameters are further studied to guide deployment test.Based on the results of theoretical analysis and simulation, test system for theprototype of the deployable structure is established. And the control system whichconsists of upper monitoring system and lower control system is completed. The tests ofdeployment function of the prototype are conducted, and the results of the tests verify that the prototype is deployable. Meanwhile, comparative studies of effects of drivingstrategy on locking case are launched, and finally the driving strategy which can makethe mechanism completely locked is given. Besides, vibration test of the deploymentprocess is conducted, and the results claim that spring is conducive to locking themechanism.