Abstract
Large space structures (LSS) composed of trusses, cables and meshes deployed on orbit, serves as the large antenna for different space missions. Deployable structures which are employed as large space supporting structures of space-borne antennas are widely used in earth observation space missions due to their large stiffness, small folding volume, light weight and easy extensibility. The dynamic research on deployable structures is great importance for the design, analysis, and capacity improvement of such structures. Each LSS contains many joints to combine the substructures, which contain clearance inevitably. The existence of the clearance causes the complicated dynamic characteristics of the LSS. It is necessary to estimate the influence of clearance on the structure. Hinge stiffness is an important factor in determining the dynamic characteristics of articulated structure, this paper will analyze the dynamic characteristics of radial connection part of the plane rotary hinge on large space deployable circular truss antenna structure, the radial kinetic model of hinges is established, the influence of hinge clearance, external excitation and displacement amplitude are discussed. The results indicate that the effect of clearance on the dynamic stiffness of the hinge is significant. On the exciting frequency and natural frequency in the hinge, when the ratio of radial vibration amplitude and the hinge clearance is constant, dynamic stiffness coefficient with the increase of external excitation is reduced. Dynamic stiffness coefficient with the frequency increases with increasing hinge. On the gap size and the hinge vibration amplitude, fixed frequency ratio, with the increase of the gap, the dynamic stiffness coefficient has a decreasing trend with the increase of the amplitude of the hinge, and with the decrease of the gap, the dynamic change of stiffness coefficient is not obvious, when the gap becomes larger, the dynamic stiffness coefficient increases significantly. When the clearance increases, the dynamic stiffness coefficient decreases. The validity of the theoretical calculation is verified by experiments.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: SCIENTIA SINICA Physica, Mechanica & Astronomica
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
