3R-3URU可展单元机构及其在构架式可展天线中的应用

doi:10.7527/S1000-6893.2017.421285

Abstract

Abstract:

A spatial deployable unit 3R-3URU with one Degree of Freedom (DoF) is proposed. The DoF of the single closed-loop mechanism RURUR is analyzed, based on the screw theory and the modified G-K formula. The analytical expression for the velocities of active joints and passive joints of the mechanism RURUR are then established. According to the velocity expression and the structural characteristic that three RURUR mechanisms share their first and last revolute joints, the DoF of the 3R-3URU mechanism is derived. The geometrical relationship among the positions and directions of all joints is also obtained when the 3R-3URU mechanism has one DoF. Novel deployable mechanisms are obtained by applying the 3R-3URU mechanism to the 3RR-3RRR tetrahedral unit and a deployable truss antenna composed of the tetrahedral units, and the novel mechanisms have two types of DoFs:movement and orientation adjustment. DoF analysis and application of the 3R-3URU deployable unit are verified by the Adams software. The proposed deployable unit 3R-3URU has the advantages of one DoF, simple structure, and single type of joints, and can be applied to the supporting mechanism of deployable truss antennas with a curved surface to achieve a large folding ratio.

Key words: deployable unit, Degree of Freedom (DoF), screw theory, folding ratio, deployable antenna

CLC Number:

V243.4
TH112

LIU Wenlan, XU Yundou, YAO Jiantao, CHEN Liangliang, WANG Hui, ZHAO Yongsheng. Deployable unit 3R-3URU and its application in deployable truss antenna[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(11): 421285-421285.

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Deployable unit 3R-3URU and its application in deployable truss antenna

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