Deployment analysis for space cable net structures with varying topologies and parameters

Nie, Rui; He, Baiyan; Zhang, Lianhong; Yonggang, Fang

doi:10.1016/j.ast.2017.05.008

Cited by 52 publications

(6 citation statements)

References 23 publications

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“…For a large DMR, rough surface error estimation (prediction), as introduced in Section 3, is only used for a preliminary design. When a mesh geometry is fully generated, evaluation of surface accuracy for a given topology and nodal positions are needed in complete DMR design, especially in comparing different structural design techniques [26] or formfinding methods [27,28]. Methods of RMS error calculation for evaluating surface accuracy of a generated mesh geometry shall be introduced and compared in this section.…”

Section: Rms Error Calculation For a Generated Mesh Geometrymentioning

confidence: 99%

Review of Root-Mean-Square Error Calculation Methods for Large Deployable Mesh Reflectors

Yuan

2022

International Journal of Aerospace Engineering

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In the design of a large deployable mesh reflector, high surface accuracy is one of ultimate goals since it directly determines overall performance of the reflector. Therefore, evaluation of surface accuracy is needed in many cases of design and analysis of large deployable mesh reflectors. The surface accuracy is usually specified as root-mean-square error, which measures deviation of a mesh geometry from a desired working surface. In this paper, methods of root-mean-square error calculation for large deployable mesh reflectors are reviewed. Concept of reflector gain, which describes reflector performance, and its relationship with the root-mean-square error is presented. Approaches to prediction or estimation of root-mean-square error in preliminary design of a large deployable mesh reflector are shown. Three methods of root-mean-square error calculation for large deployable mesh reflectors, namely, the nodal deviation root-mean-square error, the best-fit surface root-mean-square error, and the direct root-mean-square error, are presented. Concept of effective region is introduced. An adjusted calculation of root-mean-square error is suggested when the concept of effective region is involved. Finally, these reviewed methods of root-mean-square error calculation are applied to surface accuracy evaluation of a two-facet mesh geometry, a center-feed mesh reflector, and an offset-feed mesh reflector for demonstration and comparison.

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Section: Rms Error Calculation For a Generated Mesh Geometrymentioning

confidence: 99%

Review of Root-Mean-Square Error Calculation Methods for Large Deployable Mesh Reflectors

Yuan

2022

International Journal of Aerospace Engineering

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“…This urgency has made space deployable mechanisms vital; a particularly important application direction of the space deployable mechanism is their use as the deployment and support mechanism of satellite antennae (Wang et al, 2014). Hence, it is of great significance to carry out a series of studies on the main line of innovative design in space deployable antenna mechanisms as it will improve the international space science research level (Nie et al, 2017;Chen et al, 2017;Xing and Zheng, 2014). The truss mechanism has been widely used in satellite antennae due to its high overall stiffness, easy control of shape, and surface accuracy (Okhotkin et al, 2017), for example, the ring truss deployable antenna mechanism (RTDAM) on the US NISAR satellite (Kobayashi et al, 2019;Focardi and Harrell, 2019;Focardi and Vacchione, 2019) and the AstroMesh RTDAM of NGST (Meguro et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Kinematic and dynamic characteristics' analysis of a scissor multi-rod ring deployable mechanism

et al. 2023

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Abstract. In this paper, the authors developed a double-layer ring truss deployable antenna mechanism (RTDAM) based on a scissor unit, which can be used as the deployment and support mechanism in large-aperture satellite antenna. Firstly, three configuration state diagrams of the scissor multi-rod RTDAM were displayed: folded, half-deployed, and deployed. The mechanism was decomposed into a closed-ring deployable mechanism unit and several non-closed-ring deployable mechanism units. The screw constraint topological diagram of the closed-ring deployable mechanism unit was drawn, and the number of degrees of freedom (DOFs) was calculated via the screw theory method. Then, the expressions for screw velocity and screw acceleration of each component in the resultant mechanism were analyzed, calculated, and solved. The screw velocity and screw acceleration of each component were obtained, and the six-dimensional velocity and acceleration of each component were obtained through screw conversion and recursion. Finally, using the Newton–Euler equation and virtual work principle, the dynamic equation of the RTDAM with an integral scissor multi-rod ring truss mechanism was established, and the theoretical analysis was validated through numerical calculation and simulation results. The RTDAM of the scissor multi-rod ring truss proposed in this paper has a single DOF and can be well applied to the large-aperture satellite antenna.

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“…Yuan et al [19][20][21] proposed the fixed nodal position method, in which a novel geometric design approach increased the reflector surface accuracy. Ma et al 22 and Li et al 23 provided a two-step form-finding approach for systematically determining the cable force distribution. Nie et al 24,25 presented an integrated form-finding method that accounts for flexible truss and hinges.…”

Section: Introductionmentioning

confidence: 99%

A new source finding and tracking analysis approach for the active reflector of five-hundred-meter aperture spherical telescope

Chen

Zhang

Qian

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part G:

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The FAST (Five-hundred-meter Aperture Spherical Telescope) is the world’s largest single-aperture radio telescope. During operation, FAST needs to follow the observed celestial body to adjust displacements, which can be divided into two processes: the source finding and tracking. In this paper, a new numerical method based on Vector Form Intrinsic Finite Element (VFIFE) is proposed to simulate the source finding and tracking process for FAST’s active reflector. The basic principle of static equilibrium and calculation flow of the sourcing and tracking analysis is proposed, and the finite element program is compiled to analyze the displacement process of the reflector cable-net structure. Then, six typical test conditions are selected to simulate the sourcing and tracking displacement process. The obtained final form in the equilibrium state adheres to the target configuration, demonstrating the applicability of the suggested approach and the correctness of calculation findings. In addition, the change in the actuator length and the structural force distribution can be simultaneously derived. These values serve as a vital theoretical foundation for FAST’s practical operation and regulation.

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Deployment analysis for space cable net structures with varying topologies and parameters

Cited by 52 publications

References 23 publications

Review of Root-Mean-Square Error Calculation Methods for Large Deployable Mesh Reflectors

Review of Root-Mean-Square Error Calculation Methods for Large Deployable Mesh Reflectors

Kinematic and dynamic characteristics' analysis of a scissor multi-rod ring deployable mechanism

A new source finding and tracking analysis approach for the active reflector of five-hundred-meter aperture spherical telescope

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