EMU Overview and Sizing. February 3, 2006

Transcription

1 EMU Overview and Sizing February 3,

2 EMU Sizing - Agenda The purpose of this overview is to inform the reviewers of: Components of EMU Suit fitcheck process and the basics of an optimal suit fit 2

3 EMU - Overview The EMU is the interface between the Crew Member and the EVA environment Provides a protective barrier against natural environment Supplies oxygen for breathing and circulates water for cooling Space Suit Assembly (SSA) anthropomorphic pressure vessel that encloses the crewmember Life Support System (LSS) backpack containing consumables needed to sustain crewmember Thermal Micrometeoroid Garment (TMG) Different layer garment covering EMU provides protection against radiation and micrometeoroids Simplified Aid for EVA Rescue (SAFER)- propulsive jetpack used for self rescue 3

4 EMU - Overview Helmet/ EVVA Upper Arms HUT Lower Arms DCM Gloves Waist Brief Assembly Boots Leg Assembly 4

5 EMU- Helmet/ Extravehicular Visor Assembly (EVVA) Helmet Components: Clear polycarbonate bubble Neck ring Ventilation pad Helmet purge valve EVVA Components: Protective visor Gold visor Sunshades One standard size Sunshades Vent Pad Neck Ring Protective Visor Gold Visor HPV 5

6 EMU-HUT Planar HUT: rigid fiberglass structure surrounding the upper torso All other major components of the EMU are attached to the HUT Components: Neck ring Body Seal Closure (BSC) Waterline and Vent Tube Assembly (WLVTA) Medium, Large, X-Large All sizes use standard 16 BSC On orbit replaceable unit (ORU) Scye bearings canted forward Shoulder movement is limited Shoulder Harness Scye Opening Neck Ring 6 HUT side BSC

7 EMU Arm Assembly Components: Upper arm: allows shoulder mobility Lower arm: allows elbow/wrist mobility Sizing ring: 0.5 if required Nine sizes of lower arms Cam brackets provide additional adjustment Upper Arm Elbow Lower Arm Wrist Disconnect 7

8 Short EMU sizing adjustment 8

9 EMU Phase VI Gloves - Overview Purpose: Acts as interface between the Crewmember and associated task Provides protective barrier against natural environment Components: Bladder Restraint TMG Wrist Tether Strap Wrist Disconnect 9

10 EMU Phase VI Gloves Phase VI Gloves Variety of existing and custom sizes Dual axis, two ring wrist gimbal design Phase VI Glove 10

11 EMU Phase VI Gloves - Restraint Palm Bar Strap Palm bar and palm plate prevent pressurized glove from ballooning out Tension adjusted via buckle on back of hand under glove TMG flap Palm Bar Palm Bar Strap Palm Bar Buckle Palm Plate 11

12 EMU Lower Torso Assembly (LTA) Components: Waist brief assembly Leg Assembly Boots Sizing rings (if required) Waist brief assembly: connects HUT to LTA via BSC Thigh sizing ring: 0.5 Leg sizing ring: 0.5, 1.0, or 1.5 Boots: Limited sizing due to foot restraint Heel has slot to fit in foot restraint Waist brief assembly Leg Assembly Boots Thigh Sizing Ring Leg Sizing Ring 12

13 LTA sizing adjustments 13

14 EMU-Waist Brief Assembly Two types of waists Adjustable Waist: used for flight and provides resizing capability Standard Waist: mostly used for NBL training and has 5 sizes Resizing involves manipulation of pins, axial restraints and webbing BSC Attachment Brief/Waist 14

15 EMU-Leg Assembly Encloses middle part of leg Four sizes of legs Two cam brackets offer additional sizing (0.5 x 2 = 1 total) Knee joint provides flexibility Cams Knee 15

16 EMU-Boots Two sizes of boots Boot Sizing Inserts (BSI) with Toe Caps provide foot indexing within the boot and thermal protection. If BSI not worn, then thermal slipper sewn onto LCVG Boot BSI Thermal Slipper Toe Cap 16

17 EMU- Liquid Cooling Ventilation Garment (LCVG) Nylon cloth with clear and yellow tubing Liquid cooling tubes maintain desired body temperature Vent ducts at extremities send oxygen to primary life support system for conditioning Seven sizes with additional adjustments Comfort pads reduce pressure points or take up free volume in the EMU. Various Comfort Pads Vent Ducts 17 Leg Cuff Extensions

18 Components: EMU- Communication Carrier Assembly (CCA) Crew Communications Electronics Module (CCEM) Neck or Chin Strap Sweat Band Ear Cups. Six sizes CCAs CCEM contains the microphone booms Redundant mic booms and ear pieces CCEM with Mic booms 18

19 EMU- Disposable In-Suit Drink Bag (DIDB) Stores 32 oz drinkable water in the HUT Filled through the Station/Shuttle galley Contained in a restraint bag Twisting the bite valve can lead to leakage Straw may be repositioned Bite Valve Straw 19

20 EMU-Ancillary Hardware Comfort gloves: Worn under EMU gloves Provides added comfort Allows easier donning/doffing Wicks away perspiration. Thermal Comfort Undergarment (TCU): worn under the LCVG undershirt and underpants Maximum Absorbency Garment (MAG): super-absorbent undergarment worn during EVA Crew Preference and Options Document: Valsalva, Fresnel Lens, Socks, Wristlet, sports bra, etc. 20

21 EMU Examples of Ancillary Hardware COMFORT GLOVES 21 Read the Crew Preference and Options Document

22 SAFER Provides contingency self rescue capability No redundancy Accommodates rescue when Orbiter is unavailable Utilizes GN2 thrusters Virtual reality lab provides 6 DOF training One time use only Evaluate SAFER reach in NBL 22

23 The purpose of this overview is to inform the reviewers of: Components of EMU Suit fitcheck process/optimal suit fit 23

24 EMU Fitcheck Process Proper fitcheck is critical! ensures no long/short term physical impairments ensures mission success Iterative process utilizing predicted sizing for initial fit and crewmember comments for recommended sizing Suit fit is evaluated in a 1-G fitcheck prior to an NBL qual evaluation After all suited events, post test summaries are distributed with suit fit comments Crew Suit Eng Fitchecks & Training Events 24

25 Fitcheck Process Flowchart Measurements: Obtain anthropometric data (manually or laser device) Use anthros to predict possible EMU sizes Fitcheck: Evaluate unpressurized garments (MAG, TCU, LCVG) Discuss crew options Don/Doff HUT Don LTA Connect gloves Pressurize to 4.3 psi Evaluate reach limitations Evaluate contact areas and pressure points Be Proactive! Give fit comments to 25your suit engineer.

26 EMU Phase VI Gloves Glove Fitcheck Process Glove Fitcheck Process Flow Chart Start No Custom gloves approved by NASA Yes Yes No Perform measurements Choose potential gloves for fit check Perform fit check in glove box Acceptable fit obtained No Custom Gloves needed/ recommended Yes Iterative Process Yes Evaluate fit at NBL training event 26 Acceptable fit reported No

27 EMU Post Fitcheck Evaluation suit fit during NBL and 1-G events Post Test Summaries document sizing issues Class I hardware evaluated in chamber runs, FFV 1 is added to the waist length for zero G spinal growth 27