Скачать презентацию SPHERES ISS Flight Preparation Hardware Status 08 Скачать презентацию SPHERES ISS Flight Preparation Hardware Status 08

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SPHERES ISS Flight Preparation & Hardware Status 08 July 2002 Steve Sell (sell@payload. com) SPHERES ISS Flight Preparation & Hardware Status 08 July 2002 Steve Sell ([email protected] com) Stephanie Chen ([email protected] com)

SPHERES • • Agenda Payload Systems activities Mission description and logistics Integration activities Hardware SPHERES • • Agenda Payload Systems activities Mission description and logistics Integration activities Hardware build status 2

SPHERES Payload Systems Activities 3 SPHERES Payload Systems Activities 3

SPHERES • Payload Systems Activities Design and construct SPHERES flight hardware – Spheres – SPHERES • Payload Systems Activities Design and construct SPHERES flight hardware – Spheres – Beacons – Laptop hardware • Conduct NASA International Space Station integration activities – – – • Safety review process Develop experiment procedures Conduct crew training Create Graphical User Interface (GUI) Conduct training of ISS crews Conduct hardware analyses and testing – Safety verification analysis – Flight certification testing • • Vibration EMI acoustic 4

SPHERES Mission Description and Logistics 5 SPHERES Mission Description and Logistics 5

SPHERES Major Components Laptop Assembly SPHERES Satellites Ultrasound Beacon (5 Total) 6 SPHERES Major Components Laptop Assembly SPHERES Satellites Ultrasound Beacon (5 Total) 6

SPHERES Hardware Components • SPHERES consists of three “satellites”, eight inches in diameter – SPHERES Hardware Components • SPHERES consists of three “satellites”, eight inches in diameter – Each satellite is self-contained with power (AA batteries), propulsion (CO 2 gas), computers, and navigation equipment – The satellites communicate with each other and an ISS laptop through a low-power wireless (RF) link • Five ultrasound beacons located in the SPHERES work envelope act as a navigation system – Each beacon is self-contained and uses two AA batteries – A single beacon is approximately the size of a pager – Operational volume is 6’ x 6’ (up to 10’ x 10’ is possible) 7 Satellite PADS beacon

SPHERES Satellite -X Thruster Ultrasonic receivers CO 2 tank Adjustable regulator Pressure gauge Diameter SPHERES Satellite -X Thruster Ultrasonic receivers CO 2 tank Adjustable regulator Pressure gauge Diameter 8 in (0. 2 m) Mass 7. 85 lb (3. 56 kg) Thrust (single thruster) <1 oz (0. 2 N) CO 2 Capacity 6 oz (170 g) +Z Satellite body axes -Y 8

SPHERES Operational Configurations • Mode 1: Single satellite operations – Long term station-keeping – SPHERES Operational Configurations • Mode 1: Single satellite operations – Long term station-keeping – Minimum propellant maneuvers through pre-determined profiles • Isolated multidimensional rotation, multidimensional translation • Combined rotation & translation • Modes 2 and 3: Multiple satellite operations (two or three satellites) – Docking – Topological orientations • • Independent control Collision avoidance Hierarchical control (leader-follower) Distributed control (consensus) Example configurations on the KC-135 9

SPHERES Typical Test Session Each satellite calculates position from PADS beacons Transfer protocol/commands via SPHERES Typical Test Session Each satellite calculates position from PADS beacons Transfer protocol/commands via wireless link to satellites ISS Laptop Uplink protocols to OPS LAN prior to SPHERES ops Data continuously downloaded to laptop Satellites performation flying maneuver ISS Laptop Downlink experiment data to ground after SPHERES ops 10 Control loop Appropriate thrusters fire

SPHERES Unstow equipment Load tanks & battery packs into satellites Typical Crew Operations Setup SPHERES Unstow equipment Load tanks & battery packs into satellites Typical Crew Operations Setup test area (position US beacons) Take down and stow equipment Upload protocols from laptop to satellites Run protocols from laptop NO YES Satellites out of gas / power? 11 NO Test session over? YES

SPHERES GUI (Sample) 12 SPHERES GUI (Sample) 12

SPHERES • Mission Logistics SPHERES manifested on ISS for two increments – Ascent flight SPHERES • Mission Logistics SPHERES manifested on ISS for two increments – Ascent flight ISS-12 A. 1 (STS-116, June 2003), – Resupply flight ISS-13 A (STS-117, September 2003) for replacement of consumables – Descent flight ISS-15 A (STS-119, January 2004) • Operation Time – Allocated 20 hours operation time (nominally spread over twelve sessions) • Initial stowage requirements – – – Three SPHERES satellites Five US beacons Laptop transmitter Consumables (CO 2 tanks and battery packs) Spares TBD 13

SPHERES Stowage Allocation • SPHERES is allotted 1. 83 Middeck Locker Equivalents (MLEs) over SPHERES Stowage Allocation • SPHERES is allotted 1. 83 Middeck Locker Equivalents (MLEs) over ascent and resupply flights – 1. 5 MLE total on ascent flight – 0. 33 MLE total on one resupply flight • Stowage allocated in Cargo Transfer Bags in the Space. Hab Module – Possible to be stowed in any locker location 14

SPHERES Consumables • Two approaches were taken to determine consumable estimates: top-down (fixed stowage SPHERES Consumables • Two approaches were taken to determine consumable estimates: top-down (fixed stowage constraint) and bottom-up (fixed operation hours) • CO 2 tanks – Part of the SPHERES mission investigates ways to minimize propellant usage – This means that no exact number of tanks can be determined for total operations – Initial estimate is 94 tanks • Batteries – Current estimate is 88 battery packs Replacement CO 2 tanks and battery packs 15

SPHERES ISS Equipment • Workstation – SPHERES will use Payload Equipment Restraint System (PERS) SPHERES ISS Equipment • Workstation – SPHERES will use Payload Equipment Restraint System (PERS) as a temporary workstation – H-Strap interfaces with seat track provide two sides of velcro • Attach laptop restraint for configurable laptop station • Belly bag can be used to contain extra hardware (satellites) during test session Laptop Restraint 16 Belly Bag H-Strap

SPHERES ISS Equipment • Laptop – SPHERES GUI runs protocols from laptop • Protocols SPHERES ISS Equipment • Laptop – SPHERES GUI runs protocols from laptop • Protocols uplinked to OPS LAN but no connection is required during testing – Data stored on laptop until downlinked to ground following test session ISS Laptop • US beacons will attach to seat-track interfaces and/or handrail clamps – Locations will be entered into laptop prior to operations Handrail clamp 17

SPHERES Operational Scenarios • SPHERES will operate in United States Operational Segments (USOS) only SPHERES Operational Scenarios • SPHERES will operate in United States Operational Segments (USOS) only • Ideal test area is 6’ x 6’ – Most likely will operate in 5’ x 10’, given ISS Node configuration Envisioned operations in US Lab Envisioned operations in ISS Node 1 18

SPHERES Integration Activities 19 SPHERES Integration Activities 19

SPHERES Integration Status & Milestones • Status – – Completed Phase II Safety Review SPHERES Integration Status & Milestones • Status – – Completed Phase II Safety Review Feb 2002 Payload Integration Agreement baselined June 2002 Preliminary draft of crew procedures submitted June 2002 First test of positioning system in ISS node mockup conducted June 2002 • Upcoming milestones – – – – KC test of engineering Sphere scheduled July 2002 October 2002 – EMI and Vibe testing November 2002 – Payload Training Dry Run November 14, 2002 – Phase III Safety Review December 2002 – Training Session 1 January 31, 2003 – Flight hardware delivery to JSC June 5, 2003 – Launch on STS-116, 12 A. 1 to ISS 20

SPHERES Hardware Build Status 21 SPHERES Hardware Build Status 21

SPHERES Flight Hardware Status • First unit build is 95% complete: all components are SPHERES Flight Hardware Status • First unit build is 95% complete: all components are inhouse – – – All structural components completed and assembled All avionics components completed and assembled All pressurized components installed Not all tubing and wiring has been routed Shell is prototype • Anticipated 100% complete build in 1 -2 weeks 22

SPHERES Structural Frame • Aluminum structure Metal bracket – Six laser cut rings – SPHERES Structural Frame • Aluminum structure Metal bracket – Six laser cut rings – Six sheet metal brackets – Twelve cross members – Provides stiffness and mounting points for satellite components Laser cut rings Cross members 23

SPHERES Structure 24 SPHERES Structure 24

SPHERES Electronics Board Locations • Electronics are divided into two assemblies – PADS and SPHERES Electronics Board Locations • Electronics are divided into two assemblies – PADS and computing • Signal processing • Computing – Propulsion and power • Thruster valve control • Power distribution Propulsion and power boards PADS and computation boards 25

SPHERES Assembly - Avionics 26 SPHERES Assembly - Avionics 26

SPHERES Structural Assembly Stage One • Electronics assemblies – Electronics are assembled inside a SPHERES Structural Assembly Stage One • Electronics assemblies – Electronics are assembled inside a partial structure and wired – Avionics can be tested on the bench top 27

SPHERES Structural Assembly Stage One 28 SPHERES Structural Assembly Stage One 28

SPHERES Structural Assembly Stage Two • Remaining sheet metal brackets are attached – Battery SPHERES Structural Assembly Stage Two • Remaining sheet metal brackets are attached – Battery packs and regulator/tank assembly can then be installed Mounting brackets 29

SPHERES Structural Assembly Stage Two 30 SPHERES Structural Assembly Stage Two 30

SPHERES Structural Assembly Stage Three • Propulsion system tubing is routed – Tubing is SPHERES Structural Assembly Stage Three • Propulsion system tubing is routed – Tubing is assembled prior to final structural element placing – Manifolds distribute gas from CO 2 tank to twelve thruster nozzles Tubing manifolds Thrusters 31

SPHERES Structural Assembly Stage Three 32 SPHERES Structural Assembly Stage Three 32

SPHERES Full Assembly • Satellite is fully functional without shell Ultrasonic receiver Thruster Aluminum SPHERES Full Assembly • Satellite is fully functional without shell Ultrasonic receiver Thruster Aluminum frame Pressure gauge CO 2 tank Battery pack 33

SPHERES Full Assembly 34 SPHERES Full Assembly 34

SPHERES External Shell Structure • Two part shell assembly – – Polycarbonate half shell SPHERES External Shell Structure • Two part shell assembly – – Polycarbonate half shell Attachment screw 35 Constructed of polycarbonate Secured with four fasteners per side Hinged door for battery access Cut-outs for thrusters and sensors

SPHERES • • Schedule Milestones July 29 - August 3, 2002 – KC-135 Flights SPHERES • • Schedule Milestones July 29 - August 3, 2002 – KC-135 Flights October 2002 – EMI and Vibe testing November 2002 – Payload Training Dry Run November 14, 2002 – Phase III Safety Review December 2002 – Training Session 1 January 31, 2003 – Flight hardware delivery to JSC June 5, 2003 – Launch on STS-116, 12 A. 1 to ISS 36