Stress Superposition Method and free vibration of corner tensioned rectangular thin membranes

Li, Bingyan; Liu, Rongqiang; Cong, Qian; Guo, Hongwei; Lin, Qiuhong

doi:10.1016/j.tws.2020.107201

Cited by 9 publications

(5 citation statements)

References 41 publications

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“…The structural design for the analysis of tensioned membrane antennas has been researched in terms of space environment loads and experiments [42][43][44][45][46]. However, surface accuracy considering stiffness variations has not been researched.…”

Section: Analysis Of Structural Boundary Effects Of Copper-mentioning

confidence: 99%

Analysis of Structural Boundary Effects of Copper-Coated Films and Their Application to Space Antennas

Zhou,

Li,

2023

Coatings

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Copper-coated films are a solution for flexible electronic devices. One of the applications is a flexible-tension film-deployable antenna, which is a large deployable space antenna with broad application prospects. To analyze the possibility of applying coated films to the antenna, surface accuracy evaluation is required. The finite element method (FEM) was used to analyze the surface accuracy of the copper-coated thin-film structures. Both wrinkling and stretching–bending coupling deformation were considered. Simplified models were applied to study factors influencing the surface accuracy under boundary effects. Different sizes of coated area and different boundary conditions were simulated. The results showed the characteristic boundary effects of copper-coated thin-film structures and the influence curve of film thickness and patch size on boundary effects. These findings will inform the design and analysis of variable-stiffness thin-film antennas. On this basis, the application of a flexible-tension film-deployable antenna is discussed, along with a measure to improve the surface accuracy.

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Section: Analysis Of Structural Boundary Effects Of Copper-mentioning

confidence: 99%

Analysis of Structural Boundary Effects of Copper-Coated Films and Their Application to Space Antennas

Zhou,

Li,

2023

Coatings

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“…The reference tomography images are shown in Figures 55b and 56b, while the 3D models are depicted in Figure 55a and 56a. The large red target 1 visible in Figure 56b is a false alarm, which is generated by the southwest ascending angle of the pyramid [69]. Structure 19 (big void) is connected to the large corridor 3 to the south, at the height of the big void, via two oblique corridors.…”

Section: Big Void (Tag 19)mentioning

confidence: 99%

Synthetic Aperture Radar Doppler Tomography Reveals Details of Undiscovered High-Resolution Internal Structure of the Great Pyramid of Giza

Biondi

Malanga²

2022

Remote Sensing

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A problem with synthetic aperture radar (SAR) is that due to the poor penetrating action of electromagnetic waves inside solid bodies, the capability to observe inside distributed targets is precluded. Under these conditions, imaging action is provided only on the surface of distributed targets. The present work describes an imaging method based on the analysis of micro-movements on the Khnum-Khufu Pyramid, which are usually generated by background seismic waves. The obtained results prove to be very promising, as high-resolution full 3D tomographic imaging of the pyramid’s interior and subsurface was achieved. Khnum-Khufu becomes transparent when observed in the micro-movement domain. Based on this novelty, we have completely reconstructed internal objects, observing and measuring structures that have never been discovered before. The experimental results are estimated by processing series of SAR images from the second-generation Italian COSMO-SkyMed satellite system, demonstrating the effectiveness of the proposed method.

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“…When the membrane is modally tested in air, the effect of the air’s additional mass on the membrane’s frequency should not be ignored. The article [ 33 ] gives the free vibration equation of the membrane in air.

where

is the added-mass ratio denoting the ratio of added air mass to the mass of the membrane vibrating in air.…”

Section: Dynamic Test Analysis Of Membrane Sunshieldmentioning

confidence: 99%

Configuration Design and Dynamic Characteristics Analysis of Spacecraft Membrane Sunshield

Tao

Lin

et al. 2022

Polymers

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To meet the needs of large space telescopes, such as light weight, high folding ratio, and low manufacturing cost, a flexible deployable regular hexagonal membrane sunshield is proposed in this paper. Firstly, the dynamic equation of the membrane plane is established by the micro-element method. Then, the response surface method is used to obtain the mathematical model of the fundamental frequency of the membrane sunshield. The factors influencing this model, such as the corner pulling force, the effective circle radius, and the edge arch height, are analyzed. By combining the formula of the fundamental frequency of the membrane sunshield and the effective area ratio of the sunshield, the multi-objective optimization function of the fundamental frequency of the membrane sunshield is obtained. A scaled-down experimental prototype of the membrane sunshield is built, and the modal test is performed on the thin membrane plane with a circular fixed boundary in the middle. Comparing the experimental results with the finite element simulation results, the mode shape and the fundamental frequency are highly consistent. This proves that the model can be used to solve the fundamental frequency of the membrane sunshield under the same boundary.

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Stress Superposition Method and free vibration of corner tensioned rectangular thin membranes

Cited by 9 publications

References 41 publications

Analysis of Structural Boundary Effects of Copper-Coated Films and Their Application to Space Antennas

Analysis of Structural Boundary Effects of Copper-Coated Films and Their Application to Space Antennas

Synthetic Aperture Radar Doppler Tomography Reveals Details of Undiscovered High-Resolution Internal Structure of the Great Pyramid of Giza

Configuration Design and Dynamic Characteristics Analysis of Spacecraft Membrane Sunshield

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