Design and Mechanical Analysis of Cable Rod Truss Deployable Mechanism

doi:10.3901/JME.2022.17.135

Abstract

Abstract: A new cable-rod truss-type deployable unit is designed to achieve high rigidity and light weight of the large-space deployable mechanism. The section of the new deployable unit is composed of three regular triangles whose three sides of the triangle are replaced by cables. The central trident structure is used for traction and tension of the cables. The compressed torsion spring is used as the driving element during the unfolding process, and the synchronous movement of each basic deployable unit along the axial direction is realized through the double crank-slider mechanism. The design of two-way folding-unfolding greatly reduces the volume of the mechanism after folding, the style of combination of cables and rods reduces the overall mass of the mechanism. Self-locking hinges are arranged at the connecting nodes of the rods to lock the mechanism into a stable state when fully deployed. The dynamic simulation results of ADAMS software verify the feasibility of the mechanism deployment process. The greater the stiffness of the torsion spring, the greater the initial angular velocity of deployment and the shorter the deployment time. The static stiffness analysis of the mechanism after deployment shows that by arranging the diagonal cables along the axis of the mechanism, and when the diagonal cables are in a preloaded state, the deployable mechanism can obtain higher structural stiffness. The modal analysis of the mechanism shows that, compared with the mechanism without diagonal cables, the vibration frequency of the expandable mechanism with diagonal cables is increased.

Key words: light deployable mechanism, static analysis, structural rigidity, kinematics analysis

CLC Number:

V443

SHEN Lijing, GENG Kun, LI Panhao, ZHANG Jing. Design and Mechanical Analysis of Cable Rod Truss Deployable Mechanism[J]. Journal of Mechanical Engineering, 2022, 58(17): 135-143.

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