Design and Dynamic Analysis of Planar Deployable Mechanical Network Based on Trisymmetric Bricard Linkages and Sarrus Linkages

Trisymmetric (TS) Bricard linkage has good deployable characteristics, and the Sarrus linkage has a large deployment ratio and normative motion characteristics. In this paper, the TS Bricard linkage and the three-branch Sarrus linkage are combined to construct the single-layer and double-layer deployable mechanical networks (DMN), respectively. On the basis of the finite element method, a dynamic model of the DMNs is established, and the vibration frequencies and corresponding modal modes of the two DMNs are compared and analyzed. The relationship between the modal modes and the network configuration parameters is obtained. Results show that the modal frequency and stiffness-inertia ratio of a double-layer mechanical network are higher than the single-layer one, which proves that the double-layer mechanical network has better material utilization efficiency. The results also show that using carbon fiber with high-stiffness material can improve the modal frequency and stiffness-inertia ratio. The research is significant for the study of the DMN because it uses spatial single-loop linkages.