Suited for Spacewalking pdf - Virtual Astronaut

More documents

Recommendations

Info

InvestigationPotato Astronaut—Part Tw oIn part one of Potato Astronaut, students foundthat "high speed" impacts enabled the plastic strawto penetrate the potato without coll a p s i n g.Challenge the students to design a way to protectthe potato from damage caused by impacts usingjust the materials they brought to the classroom.Their solutions to the challenge should be flexibleand light in weight.Extensions• Compare technologies for protecting astronautsfrom micrometeoroid and space debris impacts toother protective technologies such as bullet-proofvests, suits of armor, shields on power tools, andwindshields on vehicles. How does the functiond e t e rmine the form? (e.g. M o t o rcycl ehelmet–provide protection during crash . . . bestreamlined . . . comfortable to wear . . . protectface from bug and rock impacts, etc.)• E x p e riment with diffe rent fabrics and fabri ccombinations for protective garments.Materials and Tools ChecklistPlastic (milkshake-size) strawPotatoTissue paper, notebook paper, handkerchiefs,rubber bands napkins, aluminum foil, w a xpaper, plastic wrap, etc.Impact Resistance Test Stand (from TeacherTech Brief )ProcedureStep 1. S tudents design a method for pro tecting pota t oa s tro n auts from damage caused by the plastics traw when the straw is quickly stabbed intothe pota t o.Step 2. Af ter students have te s ted a method for pro te c t -ing a pota t o , conduct a discussion to eva l u a tete chnologies devel o p e d. R efine the constra i n t sfor a pro tection sy s tem (e. g. the materials usedmust toge t h er be no thicker than mm).Step 3. Have students redesign their system based onthe refined constraints. Conduct additionalimpact tests with the straw.Step 4. Test pro tection sy s tems by using the anImpact Resistance Test Stand as described inthe Teacher Tech Brief found earlier in theguide. Evaluate the effectiveness ofthe protec -tion systems developed.7 0 • Suited for Spacewalking An Activity Guide for Technology Education, Mathematics, and Science, EG- 1 9 9 8 - 0 3 - 1 1 2 - H Q
Exploration BriefKeeping Your CoolC o n t ex tIt is not sufficient for the health and well-being of ana s t ronaut just to be protected from the haza rds of thee nv i ronment in which he or she is trying to work . It isalso necessary to consider the con d i t i ons that are createdby the suit itself. One of the most important ofthese con d i t i ons is tempera t u re .Suit insulation technologiesprotect the astronaut from extreme high andl ow tempera t u res of the space env i ron m e n t .H ow eve r,the same insulation tech n o l o gy also works to keepheat released by the astronaut's body insidethe suit. To get an idea of what this is like, i m a g i n ewalking around in summer wearing a plastic bag. Fo rthis re a s on ,an active cooling system is employe d .In Space Shuttle Extra vehicular Mobility Units orEM Us , the cooling system consists of a netw o rk ofs m a ll diameter water circ u l a t i on tubes that are heldclose to the body by a Spandex® body suit. H e a treleased by the astronaut's body movements is tra n s-fe r red to the water where it is ca r ried to a re f ri g e ra t i onunit in the suit's back p a ck .The water runs across ap o rous metal plate that is exposed to the vacuum ofouter space on the other side. Sm a ll amounts of waterpass through the pores where it fre ezes on the outsideof the plate. As additional heated water runs across thep l a t e, the heat is absorbed by the aluminum and isc onducted to the exposed side. T h e re the ice begins tos u b l i m a t e, or turn dire c t ly into water vapor and dispersesin space. Su b l i m a t i on is a cooling pro c e s s .Ad d i t i onal water passes through the pore s ,and fre eze sas before . C on s e q u e n t ly, the water flowing across theplate has been cooled again and is used to re c i rc u l a t et h rough the suit to absorb more heat.Supplementing the EMU cooling system is an airc i rc u l a t i on system that draws perspira t i on-laden airf rom the suit into a water separa t o r. The water isadded to the cooling water re s e rvoir while the drier airis re t u rned to the suit.Both the cooling system and theair- circ u l a t i on system work together to con t ribute toa com f o rtable internal working env i ron m e n t . T h ew e a rer of the suit con t rols the operating rates of thes ystem through con t rols on the Display and Con t ro lModule mounted on the EMU ch e s t .Ob j e c ti ve• To investigate and experience the way the watercooling system in the Space Shuttle EM Uf u n c t i on s .Suited for Spacewalking An Activity Guide for Technology Education, Mathematics, and Science, EG-1998-03-112-HQ • 7 1
Page 1:
National Aeronauticsand Space Admin
Page 6 and 7:
National Education StandardsThe act
Page 8 and 9:
National Mathematics StandardsNatio
Page 10 and 11:
M e a s u r e m e n tThis activity
Page 12 and 13:
need to be able to move arms, hands
Page 14 and 15:
out in the vacuum of space.Dissolve
Page 16 and 17:
Project MercuryEarly spacesuit desi
Page 18 and 19:
to occur for the first time. As wit
Page 20 and 21: crew, an additional portable heat s
Page 22 and 23: and reentry, special orange-colored
Page 24 and 25: The SCU contains lines for power, c
Page 26 and 27: 17.Communications Carrier Assembly
Page 28 and 29: settings to be read. Setting number
Page 30 and 31: digital display on the chest-mounte
Page 32 and 33: Astronaut Joe Tanner works on the H
Page 34 and 35: humidity when oxygen is flowing fro
Page 36 and 37: The problem of picking up rocks and
Page 38 and 39: Bruce McCandless II pilots the MMU
Page 40 and 41: Mark C.Lee test flies the Simplifie
Page 42 and 43: STS-76 astronaut Michael R. Cliffor
Page 44 and 45: Spacesuit technicians test the mobi
Page 46 and 47: Future spacewalkers will roam the s
Page 48 and 49: Introduction:The steps spacesuit en
Page 50 and 51: Design BriefC o n t ex t :Spacesuit
Page 52 and 53: Interface Control DocumentPage 1 Of
Page 54 and 55: Pulley close-upviewthe buck e t . T
Page 56 and 57: to them. Use a metric ruler for mea
Page 58 and 59: steel would make an excellent micro
Page 60 and 61: d ay or tw o, Ap o llo spacesuit ma
Page 63 and 64: Sleeve and Leg TesterInflated segme
Page 65 and 66: ity alone.If a scale were present,
Page 67 and 68: Exploration BriefMicrometeoroids an
Page 69: InvestigationPotato Astronaut—Par
Page 73 and 74: AssessmentHave students design a gr
Page 75 and 76: InvestigationInsulating LayersIn th
Page 77 and 78: e nv i ronment experienced in Earth
Page 79 and 80: Arm Range of Movement Data SheetSub
Page 81 and 82: Body Size Range MeasurementsBased o
Page 83 and 84: ProcedureStep 1. Obtain the materia
Page 85 and 86: Magnified view oftire valve and cla
Page 87 and 88: Extensions• Compare the stiffness
Page 89 and 90: 2. Tethers4. Connector Seal TestPla
Page 91 and 92: 9. Vacuum Experiment - 1Obtain an e
Page 93 and 94: You can investigate neutral buoyanc
Page 95 and 96: MMUMercuryORUPLSSRegolithRMSSCUSkyl
Page 97 and 98: NA S A’s Central Ope ra tion of R
Page 99: Suited for Spacew a l k i n gA Te a
show all

Suited for Spacewalking pdf - Virtual Astronaut

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?