Kinematic Characteristics and Dynamics Analysis of a Double-ring Truss Deployable Antenna Mechanism

doi:10.3969/j.issn.1000-1093.2020.04.020

Abstract

Abstract: A double-ring truss deployable antenna mechanism, which is used as the support and deployment mechanism for large-diameter space-borne antenna, is proposed to improve the stiffness of the single-ring truss deployable antenna with large diameter. The structural decomposition of double-ring truss deployable antenna mechanism is conducted, the screw constraint topology graph of the closed-loop deployable mechanism unit is drawn, and the degree of freedom (DOF) of the mechanism is analyzed. The analyzed result shows that the double-ring truss deployable mechanism has only one DOF. The screw velocity of each component in the mechanism is analyzed based on screw theory, the angular velocity and centroid linear velocity of each component are obtained through vector operation, and the Jacobian matrixes are also obtained. Furthermore, the screw accelerations of the components in the mechanism are derived based on the screw derivative, and the angular acceleration and centroid linear acceleration of each component in the double-ring truss mechanism are obtained. A dynamic model of the double-ring truss mechanism is established based on Newton-Euler equation and virtual work principle, and the numerical calculation and simulation verification are carried out. The research results show that the theoretical analysis is correct. The proposed double-ring truss deployable antenna mechanism has a simple structure, and can be smoothly deployed with only one input drive, the kinematic and dynamic analysis method based on screw theory used in this paper has a clear physical meaning, the analysis process is relatively stylized and is easy to program.Key

Key words: deployableantenna, double-ringtruss, screwtheory, degreeoffreedom, kinematicscharacteristic, dynamicsanalysis

CLC Number:

V423.4⁺5

HAN Bo， XU Yundou， YAO Jiantao， ZHENG Dong， LI Yongjie， ZHAO Yongsheng. Kinematic Characteristics and Dynamics Analysis of a Double-ring Truss Deployable Antenna Mechanism[J]. Acta Armamentarii, 2020, 41(4): 810-821.

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第41卷第4期2020 年4月
兵工学报ACTA ARMAMENTARII
Vol.41No.4Apr.2020

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