Abstract
Hoop truss deployable antenna can realize the communication and data transmission between satellite and earth, which is an important type of satellite antennas, and its configuration design is currently one of the research hotspots in the field of aerospace. Based on screw theory, configuration synthesis of the hoop truss deployable mechanisms for space antenna is studied in this paper. First, the constraint synthesis method based on screw theory is briefly described, the structure and folding principle of hoop truss deployable mechanism are analyzed. Then, structure decomposition of the hoop truss deployable mechanism is carried out, it is divided into upper hoop edge, lower hoop edge and connected rods. The movement features of the nodes are described by the prismatic (P) joints, configuration synthesis of the hoop edge mechanisms is carried out, and 18 kinds of constrained branch mechanisms are obtained, two kinds of constrained branch mechanisms are selected through analysis and optimization. Furthermore, hoop edge mechanisms are obtained by combining the constrained branch mechanisms, and five hoop truss deployable mechanisms are obtained through different connection combinations. Finally, simulation models of the five kinds of hoop truss deployable mechanism are built in Solidworks and Matlab software, the deployment processes are simulated and verified, and their characteristics are analyzed and discussed. The research in this paper provides a good reference for the configuration synthesis of spatial deployable mechanisms, and the hoop truss mechanisms obtained in this paper can be well applied in the field of aerospace.
Highlights
This paper studied the configuration synthesis of the hoop truss deployable mechanisms for space antenna based on screw theory, the whole paper is organized as follows
Configuration synthesis of the hoop truss deployable mechanisms for space antenna was studied based on screw theory
It started from a brief introduction of the constraintsynthesis method, the structure and folding principle of the hoop truss deployable mechanism were analyzed, through the P joint describing the movement features, 18 kinds of constrained branches were obtained, and five kinds of hoop truss deployable mechanisms were constructed based on the selected constrained branches
Summary
Deployable mechanism can be deployed from a folded state to a predetermined structure and can withstand specific loads, it has the advantages of small mass, small occupied space, easy to store and transport, this characteristics make it has been widely used in the field of aerospace. Deployable mechanism can be used as the deploying and supporting mechanism for the satellite antennas in space, at present, space deployable antennas in orbit mainly includes tetrahedral truss deployable antennas, hoop truss deployable antennas, and radial rib deployable antennas. The hoop truss deployable antenna has the characteristics of large folding ratio and low surface density, compared with other types of deployable antennas, its mass does not increase proportionally with the increase of diameter, so that it is an ideal structural form for large-diameter space antennas.. Deng et al studied the type synthesis of articulated deployable mechanisms, Wang et al studied the topology structure synthesis of spatial pyramid deployable mechanisms based on graph theory, and constructed a large scale satellite SAR antenna, Refs. 37 and 38 studied the configuration synthesis of the truss deployable mechanisms based on graph theory, this references all conducted the research based on graph theory. Whether based on graph theory or screw theory, no research on configuration synthesis of the hoop truss deployable antenna mechanisms has been reported. This paper studied the configuration synthesis of the hoop truss deployable mechanisms for space antenna based on screw theory, the whole paper is organized as follows.
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