Thermal load effects on precision membranes

Faisal, Saira

doi:10.2514/6.1999-1525

Cited by 18 publications

(8 citation statements)

References 4 publications

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“…The net radiation thermal transfer boundary condition between reflector and space environment is obtained by considering both self-radiation of reflector and external irradiation. 4 ( )…”

Section: Differential Control Equationmentioning

confidence: 99%

“…In particular, one of the important factors that gives serious affect to the reflector is thermal cycling which is dominant neutral species in GEO. Thermal cycling [2,3] always causes the temperature gradient in reflector, the existence of the temperature gradient will generate structural [4] bucklingand distortion, even result in structural vibration [5] . So it is a necessary study on the thermal analysis of space inflatable antenna reflector in GEO environment.…”

Section: Introductionmentioning

confidence: 99%

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Simulation and experiment for large scale space structure

Sun¹,

Zhou²,

Zha³

2013

SPIE Proceedings

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The future space structures are relatively large, flimsy, and lightweight. As a result, they are more easily affected or distortion by space environments compared to other space structures. This study examines the structural integrity of a large scale space structure. A new design of transient temperature field analysis method of the developable reflector on orbit environment is presented, which simulates physical characteristic of developable antenna reflector with a high precision. The different kinds of analysis denote that different thermal elastic characteristics of different materials. The three-dimension multi-physics coupling transient thermal distortion equations for the antenna are founded based on the Galerkins method. For a reflector on geosynchronous orbit, the transient temperature field results from this method are compared with these from NASA. It follows from the analysis that the precision of this method is high. An experimental system is established to verify the control mechanism with IEBIS and thermal sensor technique. The shape control experiments are finished by measuring and analyzing developable tube. Results reveal that the temperature levels of the developable antenna reflector alternate greatly in the orbital period, which is about±120℃ when considering solar flux ,earth radiating flux and albedo scattering flux

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“…The net radiation thermal transfer boundary condition between reflector and space environment is obtained by considering both self-radiation of reflector and external irradiation. 4 ( )…”

Section: Differential Control Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation and experiment for large scale space structure

Sun¹,

Zhou²,

Zha³

2013

SPIE Proceedings

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“…The relationship between radial displacement of membrane and temperature difference is as follows [11] ,…”

Section: Finite Element Simulation Of Membrane Mirror Formingmentioning

confidence: 99%

Design and analysis of multi-electrodes distribution for shaping of electrostatic stretched membrane mirror

Jiang¹,

Wei²,

Yang³

et al. 2013

SPIE Proceedings

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One of the key technologies which need to be solved in developing membrane mirror is the surface shape control of the mirror. The pressure distribution and calculation method for the shape of a membrane paraboloidal mirror are studied in this paper. According to Karman equation in circular membrane theory, the analytic expression of the radial continuous distributed pressure load used to form a membrane paraboloidal mirror with certain aperture and F number is solved out under certain radial displacement condition. Taking the example of membrane paraboloidal mirror with diameters of 200mm, 300mm, 500mm, and F number of 10, the number and the radial width of sub-electrodes are optimized. It is founded that by using multi-electrodes distribution mode that the radial width of center sub-electrode is 1.6 times longer than that of the rest concentric annulus electrodes with same radial width, the deviation between the membrane mirror shape and the standard paraboloid surface shape can be effectively reduced. The surface shape of a membrane mirror in 300mm diameter and F/10 that is formed by electrostatic stretching through a multi-electrodes plate with insulation intervals among sub-electrodes or not are simulated by using finite element analysis. It may provide a theoretical basis for practical control of membrane mirror shape.

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“…Progress has been made in this area with the use of barrier films. For space applications, additional requirements occur, due to the launch environment, uneven thermal loading, 18 and the effect of high-energy particles on the mirror. Deployment in space is very difficult and costly, as evidenced by the price tag associated with the JWST.…”

Section: Future Directionsmentioning

confidence: 99%

New paradigm for rapid production of large precision optics: frozen membrane mirror technology

Lieber¹,

Kendrick²,

Lipscy³

et al. 2013

Opt. Eng

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Abstract. Traditional mirror manufacturing, particularly for astronomical purposes, requires substantial lead time, due to the nature of the materials and the grinding/polishing process. We propose a new technique for rapid, low-cost production of large, lightweight precision optics by fusing several technologies which in combination we call frozen membrane mirror technology (FMMT). FMMT combines well-understood subsystem technologies, including electrostatic control of membrane mirrors, adaptive optics, wavefront sensing and control, and inflatable structures technology to shorten production time. The basic technique is to control the surface of a reflective coated membrane mirror with electrostatic actuation and wavefront sensor feedback and freeze the membrane shape. We discuss the details of the concept and present results of early lab testing. We focus on the optical regime, but this technology has applicability from the microwave to x-ray spectral bands. Starting with a flexible membrane mirror, one can envision techniques for deployment of large apertures in space.

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Thermal load effects on precision membranes

Cited by 18 publications

References 4 publications

Simulation and experiment for large scale space structure

Simulation and experiment for large scale space structure

Design and analysis of multi-electrodes distribution for shaping of electrostatic stretched membrane mirror

New paradigm for rapid production of large precision optics: frozen membrane mirror technology

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