Possible options for jointly deploying a ring provided with V-fold bars and a flexible pre-stressed center

Medzmariashvili, N.; Medzmariashvili, E.; Tsignadze, N.; Tusishvili, O.; Santiago-Prowald, J.; Mangenot, C.; Baier, H.; Scialino, L.; Philipenko, Ludmila

doi:10.1007/s12567-013-0037-6

Cited by 11 publications

(3 citation statements)

References 1 publication

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“…Tzerodz [17] presents a circumferential ring architecture of a conical V folded shape and 4m diameter with a first frequency of 0.472Hz. Similary, Medzmariashvili [18] presents a conical frame with a diameter of 6m with a first mode of 0.624Hz, with an antenna is around 13kg. In our case, the requirement of the first eigenfrequency of the antenna must be higher than 1Hz.…”

Section: Iii313 Modal Analysis Of the Conceptmentioning

confidence: 93%

New three-dimensional network concept for deployable space antennas

Bettini¹,

Maetz

Quirant

et al. 2022

Acta Astronautica

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Section: Iii313 Modal Analysis Of the Conceptmentioning

confidence: 93%

New three-dimensional network concept for deployable space antennas

Bettini¹,

Maetz

Quirant

et al. 2022

Acta Astronautica

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“…The European Union and the European Space Agency have also conducted a lot of research on space-folding mechanisms, mainly applied to the expansion and contraction of solar panels as well as the construction of satellites and space vehicles. The European Space Agency and a number of research institutions such as Georgia Technical University (Datashvili, 2013;Medzmarlashvili et al, 2013) jointly developed a conical-ring deployable antenna with a diameter of up to 6 m after development. The antenna is composed of a number of trapezoidal components, including upper and lower V-shaped folding rods, vertical rods, synchronous hinges, driving springs, and cable components.…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of a box-structured satellite deployment mechanism with self-actuated torsion joints

Sheng,

Ma,

2024

Mech. Sci.

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Abstract. This paper designed a kind of satellite deployment mechanism with a boxed structure and passive torsion joints. This deployment mechanism has significant strengths, including a high base frequency and stiffness, a high ratio of deployed and folded space occupation ratios, and self-actuated joints without needing any external power to drive. In order to analyze the dynamic characteristics of this mechanism, a simplified governing equation is proposed and dynamic behavior is studied systematically, including impact response, harmonic response, and modal analysis. Through systematic research, several conclusions are drawn. Firstly, when the deployment mechanism reached the ending stage of unfolding driven by passive torsional joints, the load base installed on top of the deployment mechanism generated a first-order sharp reaction force and multiple low-order shocks followed, and the system entered a stable state after a certain time of vibration. Secondly, the system can generate a high vibration magnitude at low-frequency excitation when the mechanism is in a fully deployed state and at high-frequency excitation when the mechanism is in a folded state. Thirdly, the first sixth-order natural frequency and vibration shape with different wall thicknesses are obtained by modal analysis. The result shows that only with a 2.5 mm wall thickness can the connecting rod satisfy the design requirement. Through dynamic behavior research, the structure characteristics are obtained which can be used for structure optimization and to provide an effective solution for the design of a box-structured satellite-unfolding mechanism with self-actuated torsion joints.

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“…The properties of the structure are investigated when its cross-section changes. Medzmariashvili et al (2013) presented a conical ring structure comprised of V-type folding rods that have been fabricated in a prototype model. The designs which follow recent ESA patents have been successfully manufactured and tested.…”

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics and structural stability analysis of a large annular tensegrity structure with radial ribs

Shi

Guo

Liu

2023

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PurposeIn order to make the aperture of spatial deployable antenna larger, this paper proposed the study on a spatial annular tensegrity structure with 100 m large scale, which could be one of the ideal solutions to improve the dimension of the antenna. This study is aiming to figure out the dynamic characteristic of ultra-large annular tensegrity and address the problem of insufficient rigidity with local modes that many ring truss-type deployable antenna structures have faced.Design/methodology/approachThis work is carried out based on the nonlinear dynamic modelling when fully considering the effect of bending and torsion deformation of beams, as well as the pretension of cables. Additionally, the structural stability analysis based on the proposed stability criterion is also presented to evaluate the tensegrity configuration with different distribution of cable groups.FindingsThis research results verify that the modified structure with radial ribs could eliminate the effect of the local vibration mode on stiffness and is suitable to meet the requirements of the annular tensegrity structure. Additionally, the calculation results demonstrate that the structural configuration of annular tensegrity with 36 groups of cables which share the nodes with radial ribs is more appropriate to enhance the stiffness and structural stability.Originality/valueA new large annular tensegrity structure with radial ribs and tensioned cables is proposed. Based on the proposed structural configuration, the positive definiteness of the tangent stiffness matrix is carried out as the criterion of stability and the composition of the analytical expression of the tangent stiffness matrix is analyzed. Four levels of tensegrity structure stability have been carried out and the influence of the structural parameters on the stability and the rigidity has been analyzed. A scaled-down prototype is developed to verify the feasibility of the design of the hoop-column-rib configuration by the deployment and dynamic experiment.

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Possible options for jointly deploying a ring provided with V-fold bars and a flexible pre-stressed center

Cited by 11 publications

References 1 publication

New three-dimensional network concept for deployable space antennas

New three-dimensional network concept for deployable space antennas

Dynamic analysis of a box-structured satellite deployment mechanism with self-actuated torsion joints

Dynamic characteristics and structural stability analysis of a large annular tensegrity structure with radial ribs

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