Structural Design And Dynamic Study Of Ring Truss

With the development of space communication and manned spaceflight,the development of large deployable ring antennas with excellent dynamic performance has received significant attention in recent years.As the primary source of stiffness for the antenna structure,ring truss structures have encountered difficulties in manufacturing and cost escalation as they scale up.Ground testing of large-scale structures is also challenging.To facilitate the experimental analysis of ring truss structures and reduce development costs,this paper proposes a deployable mechanism for a ring truss with an adjustable number of cells.This mechanism can accommodate various types of ring truss configurations.The main research content of this paper are as follows:Analyzing the development principle and driving method of the deployable mechanism and providing an overall configuration for the deployable ring truss structure.Based on the analysis of joint structure design,two new ring truss structures are proposed.According to the new overall structure design,modeling and assembly are carried out.Finally,the two design schemes are analyzed and compared to optimize the basic model for the next step.Dynamic simulation of the six-side,ten-side and thirty-side ring truss models of the selected scheme using ADAMS.The feasibility of the design is verified by setting different velocity planning parameters.Simulation curves for the displacement,velocity and acceleration of the vertical bar centroid of the truss mechanism are obtained,and the simulation results are analyzed,which provides a data foundation for actual testing.Using ANSYS and ADAMS for rigid-flexible coupling simulation,the influence of the support arm on the ring truss is studied.The system’s response is analyzed under two situations based on the truss extension process.The first case is where the upper arm is rigid and the lower arm is flexible,while the second case is where both upper and lower arms are flexible.Taking the centroid of the outer vertical pole of the truss mechanism as an example,the effect of arm flexibility on the truss when it reaches the target position is analyzed for both cases.Based on the virtual model of the truss mechanism,prototypes of hexagonal and decagonal ring-expandable mechanisms are developed.Physical prototypes are tested for deployment and structural vibration to validate the design of the variable edge joint and fixed number of edges ring truss expandable mechanism,laying the foundation for future research.