| With the rapid development of computer technology and continuous improvementof multi-body dynamics theory, simulation analyses of complex mechanical systemusing computer become an important auxiliary method of mechanical design. In orderto improve the performance of a new antenna named Hoop-rib deployable antenna,improvement schemes for its locking forms, driving forms and existing gaps areproposed, and their dynamic simulation analyses provide important reference for theimprovement of the antenna.Firstly, for the unideal effect of two existing locking types, two other lockingtypes are proposed. In order to study the locking performance in reliability andprecision, according to the characteristics of the four locking structures, combinedCAD software UG and multi-body dynamics software ADAMS, four lockingstructures are verified and compared through dynamic simulation analyses.Secondly, since gaps existed in the prototype model affect the deployableperformance of the antenna, a improvement scheme to reduce gaps is proposed. Byestablishing the fine dynamic models of the joint structures for the improved modeland original model, simulation analyses are carried out. Experiment results show thatreducing gaps could effectively improve precision and reduce dynamic load.Finally, according to the characteristics of Hoop-rib deployable antenna, threekinds of driving ways are proposed and the dynamic models of three driving structuresare created. In the process of establishing rope model, it is hard to simulate byconventional method for the large data quantity, therefore a new method is put forwardand its validity is verified. On this basis, by establishing dynamic models of antenna’sjoints under three driving forms, simulation analyses are carried out. Simulation resultsshow that in the driving form of tensionspring-rope, the stability of joints in thedeployable process is the best, and that dynamic load and rigid impact in the lockedposition are minimum. It is an ideal driving form. |
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