Kinematic And Dynamic Analysis Of Deployable Planar Antenna Support Structure

Deployable planar antena support truss structure is one the important payloadsthat easure the success of the deployment of the space antenna and also the keycomponent to help maintain a reasonable position on orbit. The research of thedeployment characteristics of the deployable planar antena support truss structure isof great importance to the achievement of the space antenna mission. The difficultyof the structure in this paper is about the many moving constraints. Also thecoupling of the link parameters brings great trouble in a reasonable design of drivingpath. Under the tough requirements of the deployment performance, it is of greatimprotance to find out an available deployment pattern considerning the multidegree of freedoms and the existence of many links and deal with sigular points inthe deployment of the structure. Considering on the existence of the multi-loop inthe structure, by multistage modelling method, the kinematic and dynamic analysisaccompanied by the moving parameteres designed of the motors and springs.Considering the multiloop characteristic of this structure. the analysis modelsare built by multistage method which begins with a single loop and then a2-loopmodel and so on. By coordinate transformation, the movement tracks of the keypoints are to be discussend firest and also the relative kinematic characteristics ofthe ajacent links. Also the singularition points will be discussed during thedeployment. On the analysis of a single loop,thus the analysis of other higher levelmodel can be obtained.Then based ont the kinematic analytical models, by using the Kane dynamicequations, the driving dynamic characteristics under different given driving groups.The driving torques near the special points are also paid particular attention. Fordifferent performances of the structure under different driving groups, there areenough driving groups defined. By all the possible driving groups considered, thecomparison of the difference on structure characteristics can be obtained. Thedriving torque needed and the moving track during the deployment, and also thedesign parameters of motros and springs obtained from the simulation will allprovide a credible basis to the actual design of the deployable structure.Meantime, the accuracy characteristics under given driving groups duringdeployment will be discussed on the basis of the conclusions got from the kinmaticand dynamic analysis by using the analytical models constructed before. Theanalysis of the accuracy analysis includes the relationship between the input linkparameters and the output angular positions, and the sensitity of the link length parametes by the numerical influence on the specified output variables. Therelationship of the input link length errors and the output position error is discussedby differential method on the characteristic of the structure with multi-loop. Bycomparison of the accuracy characteristic of the structure under different drivingconditions, the accuracy distribution of the structure can be obtained.On the analysis results of the kinematic analysis, the dynamic analysis and theaccuracy analsyis, the analytical model in the ADAMS will be built to simulate theactual mechanism. Thus the available motor movement design and the best assistantspring couples with reasonable parameters desgin under chosen driving group anddriving position.Also the analysis of the design of how to couple the motor andspring paraters provides important reference valut on the design of the final designand analysis of the structure.