Ground Testing of Solar Sail(public) (1) - jsforum.or.jp. Liu Yufei.pdfGround Testing of Solar...
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Ground Testing of Solar Sail Ground Testing of Solar Sail Huang Xiaoqi Liu Yufei Huang Xiaoqi, Liu Yufei Qian Xuesen Laboratory of Space Technology Qian Xuesen Laboratory of Space Technology
Transcript of Ground Testing of Solar Sail(public) (1) - jsforum.or.jp. Liu Yufei.pdfGround Testing of Solar...
Ground Testing of Solar SailGround Testing of Solar Sail
Huang Xiaoqi Liu YufeiHuang Xiaoqi, Liu Yufei
Qian Xuesen Laboratory of Space TechnologyQian Xuesen Laboratory of Space Technology
ContentsContents
1 8×8m Solar Sail Prototype1. 8 8m Solar Sail Prototype
2 Ground Deployment Demonstration2. Ground Deployment Demonstration
3. Structure static test
4. Solar Sail Material Test
5. Conclusion
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1. 81. 8××8m8m Solar Sail PrototypeSolar Sail Prototype
Four booms :
inflatable boom , fixed to the
center structure
Position restrict mechanism:
restrict the deploy path
Four sails:
polyimide membrane, rolled
on scrolls ,8m×8m
Limited mechanism:
avoid the enwinding.
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avoid the enwinding.
2. Ground Deployment Demonstration2. Ground Deployment Demonstration
Sail Folding ProcessSail Folding Process
Thickness:12.5μm
Membrane: Kapton Membrane: Kapton
Folding method: skew leaf-out
Folding width:25cm Folding width:25cm
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L-shape folding Fix the Middle Point Spool to Drum Install to Compact Structure
2. Ground Deployment Demonstration2. Ground Deployment Demonstration
FoldFold‐‐deployment Ground Testdeployment Ground Test
25
30
35 2.5kg 2.0kg 1.5kg 1.0kg
10
15
20
Tim
e/s
The four time‐displacement curves are
0 1 2 3 4 5 60
5
Vertex position/m
The four time displacement curves areclose to straight lines, deployment speed isuniform.
Deployment process is almost Deployment process is almostproportioned without serious heap.
Sail membrane folded by the skew leaf outmethod can deploy in a quick and stabilized
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p y qstate.
Deployment process under 2.5kg loads
2. Ground Deployment Demonstration2. Ground Deployment Demonstration
FoldFold‐‐deployment Ground Testdeployment Ground Test
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3. Structure static test3. Structure static test
Experimental Apparatus & ProceduresExperimental Apparatus & Procedures
Thickness: 12.5 micron
Suspended horizontally
Tensions from 1~5KGF
Tensions act on the acute angle
vertexes
3D laser scanner
Surphaser25HSX
Resolution: distance 0.001mm &
angle 1〃
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Fast: 0.5h / test
a thin layer of DPT-5 developer
3. Structure static test3. Structure static test
Sail DeflectionSail Deflection4.5
3.0
3.5
4.0
Sail
size
(%)
1 2 3 4 5
1.5
2.0
2.5
Def
lect
ion
/
1 2 3 4 5
Tension(kgf)
Deflection decreases as an exponential curve with the increasing tensile forceTends to stabilize when the tension exceeds 4kgfTends to stabilize when the tension exceeds 4kgfConsidering the planeness of the sail & the buckling of the boom, 4kgf is proper for the scalable
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solar sail suspended horizontally
3. Structure static test3. Structure static test
Membrane WrinkleMembrane Wrinkle The wrinkles emanate from three The wrinkles emanate from threevertexes, extend to the middleregion.Wavelength is short and the peak-Wavelength is short and the peakvalley value is high near thevertexes, and the wavelengthbecomes longer and the p-v valuebecomes longer and the p v valuebecomes smaller toward the middleregion.
Long and large wrinkles occur along the threesides of the sail.sides of the sail. The number of wrinkles and the halfwavelength almost keep constant and the peak-valley value decreases slightly when the
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y g ytension increases.
4. Solar Sail Material Test4. Solar Sail Material Test
PI MembranePI Membrane
Electron IrradiationElectron Irradiation
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4. Solar Sail Material Test4. Solar Sail Material Test
Test ResultsTest Results
The color, transparence anduniformity of the samples donot change obviouslynot change obviously. Tensile strength andelongation at break increasefirst and then decrease, andthe peak appears at 1
1014 2×1014cm-2. Mechanical propertydecreases slightly after thedecreases slightly after theirradiation test.
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5. Conclusion5. Conclusion
The skew leaf out folding is a good method for the large-area sailmembrane. The sail can deploy uniformly, rapidly and well-organizedwithout twining. Sail deflection decreases as an exponential curve with theincreasing tensile force and tends to stabilize when the tensionincreasing tensile force and tends to stabilize when the tensionexceeds to a value. The peak-valley value decreases slightly whenthe tension increases. Mechanical properties of the polyimide film decrease slightly afterthe whole test.
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Thank youThank you.E-mail: [email protected] q @q
