Theoretical study on the parameter sensitivity over the mechanical states of inflatable membrane antenna

Liu, Tao; Wang, Xianheng; Qiu, Xinming; Zhang, Xinghua

doi:10.1016/j.ast.2020.105843

Cited by 18 publications

(6 citation statements)

References 32 publications

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“…In aerospace engineering, PI is pervasive and utilized for the fabrication of diverse spacecraft components, including solar arrays, solar sails, film antennae, and thermal control insulation blankets. − In the realm of high-energy-density science, PI is widely accepted as the ablator in multilayered flyers for laser-shock experiments, − proficiently generating high-pressure states without encountering preheating issues. Furthermore, within inertial fusion energy (IFE) research, PI emerges as a promising material for crafting IFE target shells that satisfy stringent constraints. − However, the exposure of PI to the space environment subjects it to hypervelocity impact (HVI) from micrometeoroids and orbital debris (MMOD). − Additionally, when employed as an ablator in laser-shock experiments or the fabrication of IFE target shells, PI undergoes substantial shock compression loading induced by high-power lasers. , Consequently, achieving a thorough understanding of PI’s shock response assumes paramount engineering and scientific significance.…”

Section: Introductionmentioning

confidence: 99%

Atomic Insight into Multilevel Microstructure Evolution and Energy Variation Mechanisms of Polyimide under Shock Compression

Liu,

Chen,

Zhu

et al. 2024

Macromolecules

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Polyimide (PI) stands as a foundational material in the aerospace industry and high-energy-density science, and its shock response under extreme conditions constitutes an increasing focus within the academic community. However, given the sophisticated molecular structure and stacking state of chains, the understanding of how PI mobilizes multiple micromechanisms in response to external shock loading remains incomplete. To fill this knowledge gap, aided by the multiscale shock technique (MSST), the dynamic behaviors of pyromellitic dianhydride (PMDA)/4,4′oxidianiline (ODA) PI over shock pressure range of 0−20 GPa are systematically studied through all-atom molecular dynamics (MD) simulations. The multilevel microstructures evolution (spanning from the covalent bond to molecular chain and to aggregation structures) and the diverse energy variation mechanisms are comprehensively analyzed. The results indicate a favorable agreement between the MD-calculated Hugoniot relations of PI and the experimental data in literature. The shock response of PI reveals two distinct stages: low shock strength (0 < P < 5 GPa, I) and high shock strength (5 < P < 20 GPa, II). In the low shock strength stage, diverse energy mechanisms engage in competitive interactions, with their sensitivity to shock pressure determined by the interaction intensities, wherein the relatively weak interchain energy emerges as the most active mechanism. In the high shock strength stage, energy mechanisms transform to coordinate with each other, maintaining consistent contributions to the total energy at a specified proportion. Microstructure analysis identifies the linkage between PMDA and ODA, as well as the ether linkage in ODA, as the most changeable bonded sites. Correspondingly, the C p −N, C p −O−C p, and C p −C p −O c −C p are the most changed bond length, bond angle, and dihedral angle, respectively. The rearrangement of rigid segments between the ether linkages is the primary reason for chain conformation, resulting in the topological structure of the entire molecular chain remaining constant, exhibiting self-similarity under varying shock pressure. Concurrently, X-ray diffraction (XRD) examinations on aggregation structure reveal a 42.6% reduction in d-spacing, indicating that the contraction of free volume is responsible for the observed shock compressibility of PI materials. This study offers insights into the molecular-level mechanisms of shocked polymers, which may serve as a blueprint for the development of advanced polymers in extreme conditions.

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Section: Introductionmentioning

confidence: 99%

Atomic Insight into Multilevel Microstructure Evolution and Energy Variation Mechanisms of Polyimide under Shock Compression

Liu,

Chen,

Zhu

et al. 2024

Macromolecules

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“…The large-scale space membrane antenna has attracted a lot of attention in recent years because of its great application prospect in the field of deep space exploration and spacebased early warning and earth observation [1][2][3][4]. To maintain the in-orbit imaging quality of the membrane antenna, the surface accuracy and pointing accuracy must be conserved stringently [5,6]; therefore, it is of great necessity to build a precise rigid-flexible coupling dynamic model and design an effective controller for the membrane-antennasatellite system.…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis and Rigid-Flexible Coupling Dynamics of a Satellite with Membrane Antenna

Liu

Cai

2022

International Journal of Aerospace Engineering

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In this paper, the thermal analysis of a membrane antenna structure is performed, and then, the rigid-flexible coupling dynamic modeling and control of the membrane-antenna-satellite system are studied with the thermal stress considered. The thermal analysis model of the membrane antenna structure is derived based on the finite element method by discretizing the structure into 1D and 2D thermal elements. Considering the thermal stress, the vibration modes of the membrane antenna structure are obtained, and the rigid-flexible coupling dynamic model of the membrane-antenna-satellite system is derived based on the hybrid coordinate method. To reduce the vibration of the membrane antenna structure caused by the attitude maneuver, the control command is designed based on the component synthesis vibration suppression (CSVS) method. Simulation results show that the dynamic properties of the membrane antenna structure are affected significantly by the space thermal environment, the vibration of the membrane antenna structure can be suppressed effectively by the presented CSVS controller, and the accuracy of the attitude maneuver will be improved significantly by the proposed control strategy.

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“…Membrane antenna has a great application prospect in the field of deep space exploration, space-based early warning and earth observing for its advantages of light weight, high folding ratio and low cost. [1][2][3][4] For the large-scale membrane antenna structure with high-flexibility, vibration is an inevitable issue. The vibration will affect the performance of the membrane antenna adversely, and even may case structural failure.…”

Section: Introductionmentioning

confidence: 99%

Model updating and vibration control of membrane Antenna spacecraft based on on-orbit modal identification

Liu

Cai

You

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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In this paper, on-orbit modal identification of membrane antenna spacecraft is investigated. Based on the modal identification results, dynamic model of the spacecraft is updated, and a vibration controller is designed. First of all, the rigid-flexible coupling dynamic model of the membrane antenna spacecraft is established by using Lagrange equation. Then, the covariance driven stochastic subspace identification (SSI-COV) method, which only relies on output measurements of the system under ambient excitation, is adopted to identify the modal parameters. By using the modal identification results, the model updating is performed based on sensitivity analysis, and vibration controller is designed to suppress the vibration caused by attitude maneuver based on the component synthesis vibration suppression (CSVS) method. Simulation results show that the SSI-COV method can identify the modal parameters of the membrane antenna spacecraft effectively, the updated dynamic model produces obvious improvements over the original model, and the vibration suppression effect of the CSVS controller is improved significantly after model updating.

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Theoretical study on the parameter sensitivity over the mechanical states of inflatable membrane antenna

Cited by 18 publications

References 32 publications

Atomic Insight into Multilevel Microstructure Evolution and Energy Variation Mechanisms of Polyimide under Shock Compression

Atomic Insight into Multilevel Microstructure Evolution and Energy Variation Mechanisms of Polyimide under Shock Compression

Thermal Analysis and Rigid-Flexible Coupling Dynamics of a Satellite with Membrane Antenna

Model updating and vibration control of membrane Antenna spacecraft based on on-orbit modal identification

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