Modal behavior of a new large reflector conceptual design

Morterolle, Sébastien; Maurin, Bernard; Dubé, Jean‐François; Averseng, Julien; Quirant, Jérôme

doi:10.1016/j.ast.2015.01.002

Cited by 40 publications

(9 citation statements)

References 7 publications

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“…Dynamic analyses were presented to improve the deployment characteristics of the antenna [7][8][9]. New structural conceptual designs, such as double-ring truss and folded xed truss and which may present higher sti ness, were mechanically designed and analyzed [10][11][12][13][14]. Further, prestress optimizations and form-nding methods were put forward to enhance the surface accuracy and structural reliability of the antennas [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Thermal–structural analysis of large deployable space antenna under extreme heat loads

Guo

Tian

et al. 2016

Journal of Thermal Stresses

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2016)Thermal-structural analysis of large deployable space antenna under extreme heat loads, Journal of Thermal Stresses, 39:8, 887-905, ABSTRACT Large deployable space antennas may be exposed to severe thermal environments in future space missions; extreme heat loads will result in considerable thermal stresses and deformations which seriously a ects the accuracy of the antenna's parabolic surface. In this study, thermal-structural nite element analysis of a deployable AstroMesh antenna under extreme heat loads was presented. Considering position and orientation with respect to the Sun and Earth, the antenna's temperature changing law under orbital heat uxes was rst evaluated to nd the worst condition as loading point. Analyses for the antenna under di erent levels of extreme heat loads were then performed to obtain the temperature distributions utilizing an equivalent quarter antenna model. Based on the temperature calculation results and prestress designs, structural analyses were nally made to gain the resulting stresses and deformations. The analysis results show that the existing antenna may generate signi cant performance distortion under extreme thermal environments; so attentions for reliability and safety under such conditions should be taken seriously in future antenna works. Modeling and analysis method proposed in this article was validated to be contributive in antenna's thermal and precompensation designs. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Thermal–structural analysis of large deployable space antenna under extreme heat loads

Guo

Tian

et al. 2016

Journal of Thermal Stresses

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“…Following numerical simulations (statics, kinematics, modal analysis), a prototype (Fig. 2) was realized at LMGC to validate the concept (Morterolle et al 2015). To minimize the complexity of the articulation between elements in scissor, thus simplifying the structure and reducing the weight, we developed a new solution based on the same deployment principle, using stored elastic energy.…”

Section: Introductionmentioning

confidence: 99%

Self-Deployable Geometries for Space Applications

et al. 2019

Self Cite

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Variable-geometry structures are useful in aerospace applications since they are adaptable, from a compact configuration (launch phase) to a spread geometry (operational phase). They may also benefit from the use of flexible joints, which store elastic energy for automatic deployment. Following the development of a self-deploying antenna frame structure with scissors, we propose in this article the geometrical configuration of a new kind of structure, simpler and lighter, minimizing mechanical joints between elements. This topology can form a circular plane or a three-dimensional structure when partially opened. The applications concern auto-tensioning structures such as meshed space antenna, deorbiting sails and also solar panels support structures. KEYWORDSSelf-deployable structure, static equilibrium, numerical simulation, analytical model, sails, 2 rigid structure.

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“…In certain cases the dynamic analysis was performed over wide temperature range: from minus 200 to 180 °С [3], from minus 70 to 120 °С [5]. Natural modes and frequencies were analyzed in connection with prestressed state [2] and some structural features [4] of reflectors.…”

Section: Problem Definitionmentioning

confidence: 99%

“…The problem definitions involve numerical [1][2][3][4][5][6] and experimental [1] studies of dynamic behavior of ground-based [1] and space deployable [2][3][4][5][6] reflector antennas. In certain cases the dynamic analysis was performed over wide temperature range: from minus 200 to 180 °С [3], from minus 70 to 120 °С [5].…”

Section: Problem Definitionmentioning

confidence: 99%

Investigation of free oscillations for reasoning constructive decisions of mirror segments of parabolic antenna

Doronin

Reyzmunt

2018

J. Phys.: Conf. Ser.

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Abstract. The paper deals with studying qualitative and quantitative relationships between constructive decisions of mirror segments of parabolic antenna and dynamic characteristics for both individual segments and ready-assembled reflector. It is shown the influence stressed state induced by thermal deformation to natural modes and frequencies of free oscillations of mirror segments. There are justified constructive decisions of the mirror to ensure low sensitivity of dynamic characteristics to service temperature conditions. IntroductionDynamic characteristics (natural modes and frequencies of free oscillations) of large-size mirror antennas for ground stations of satellite communication have a great effect on antennas productivity. Such is the case of just dynamic characteristics generate structural response to effect of wind flow, acoustic noise and sinusoidal vibrations. Regardless of the fact that the dynamics of antenna system is predominantly determined by configuration of bearing skeleton, the great practical interest is to analyze dynamic behavior of mirror segments. This analysis allows to predict and to prevent development of functional failure of antennas essentially because of vibration of mirror segments despite high dynamic characteristics of skeleton. One of the intelligent design mission is to search constructive decisions to provide overshot of lower natural frequencies of free oscillations for segments of the same for bearing skeleton. The feature of this mission is close connection of constructive decisions for bearing skeleton and mirror because of necessity of guaranteeing their assemblability and associativity as parts of mechanical system. This fact brings to the impossibility of permanent modification of structural parameters for both skeleton and mirror segments. On the contrary, one has to choice of short amount of possible alternative variants of mechanical system consisting of agreed constructive decisions for mirror segments and skeleton. This paper deals with qualitative and quantitative relationships between constructive decisions of mirror segments of parabolic antenna and their natural modes and frequencies of free oscillations. Deep understanding of these relationships is the basis for intelligent design of mirror segments of parabolic antenna taking into account restraints on its dynamic characteristics.

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Modal behavior of a new large reflector conceptual design

Cited by 40 publications

References 7 publications

Thermal–structural analysis of large deployable space antenna under extreme heat loads

Thermal–structural analysis of large deployable space antenna under extreme heat loads

Self-Deployable Geometries for Space Applications

Investigation of free oscillations for reasoning constructive decisions of mirror segments of parabolic antenna

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