AAE 450 Spring 2010 AAE 450 2/25/2010 Kathy Brumbaugh Chris Spreen

AAE 450 Spring 2010

Agenda AAE 450 Spring 2010 TimeActivity 9:30am - 9:35amAnnouncements, Reminders 9:35am – 10:00amCDR Decisions 10:00am – 10:05amRace to the finish line… 10:05am – 10:15amConcerns

Presentation feedback  Great job!  Speak louder  Pictures, charts, anything visual  Cite all references  CAD models => Martin AAE 450 Spring 2010

Project timeline

Design Stages - Description StageDescription Mission Design Requirements (MDR) Identification of all subsystems for each group’s tasks. Tasks and steps that need to be accomplished for the subsystems identified Preliminary Design Review (PDR) Exploring all the options for each aspect of the design Generating numbers for each option Communicating these numbers between groups **At end of PDR => Mission architecture possibilities have been identified. Critical Design Review (CDR) Project Managers and Group Leaders will meet to discuss all options and make decision based upon group input and calculations. Choose one option for each aspect of the design (ex. Lake Lander = sub or boat) Investigate and generate numbers for options on that design aspect (ex. What type of propulsion for the Lake Lander?) Work numbers in great detail Communicate between groups with detailed analysis and numbers for each option **At end of CDR => Mission architecture is chosen (ex. Specific engines, propellants, launch vehicle and numbers, fly-by or no fly-by, lake lander & airship configuration) Final Design Review (FDR) Project Managers and Group Leaders meet to incorporate all group discussions into choosing the best overall design including specifics for each category and aspect. Numbers and analysis are now completed in great detail. AAE 450 Spring 2010 Project Managers

Critical Design Review Launch & Entry Configuration Ballute Orbiter Airship Lake Lander AAE 450 Spring 2010

Andrew Rettenmaier 2 3 rd stage booster Orbiter Airship LL 5m 2.5m 2.95m 1m 4.0m Let’s attempt to stay within this envelope. Maximum diameter set at 4.0m. Current total height of 11.45m. This gives us 0.65 m of vertical clearance + 4 m of tapered clearance above the total 12.1 m payload cylindrical envelope. Revolved shell structure connects orbiter to gondola of airship – (gondola ideally needs to be round) 3 rd stage = RL-10A Ballute Parachutes shown as purple blocks

AAE 450 Spring 2010 Aerocapture Method  Ballute –2% mass fraction –99.99% probability of capture –Peak g’s: -2.7(axial), -0.1(lateral) –FPA = degrees –Never been done  Aeroshell –30% mass fraction for entire vehicle –99.99% probability of capture – Never been done Group Name (i.e.Trajectory Optimization)

 (A) Single-use ballute dropping off orbiter, airship, and lake lander directly after capture  (B) Dual-use ballute dropping off orbiter after capture, carrying lake lander and airship down to ~400km Entry Configuration / Separation Group Name (i.e.Trajectory Optimization) AAE 450 Spring 2010 (A) (B) 2. Ballute releases O into its 1 st orbit, LL and A into separate descents. A begins to inflate. 3. A is fully inflated & releases parachute. LL descends into lake. 2. Ballute releases O into its 1 st orbit, LL and A remain attached. A begins to inflate. 3. LL and A released from ballute. A is inflated (?). LL descends into lake with parachute. 1. Enter atmosphere O O A A A A, LL A, LL, O LL A, LL, O

Configuration of orbiter scan platform booms and moving components AAE 450 Spring 2010 Andrew Rettenmaier 3 10m magnetometer boom 2x 20m boom perpendicular to path Instrumentation scan platform can spin and tilt up to 8 deg in any direction 4m deployable/gi mbaled HGA Direction of movement ACS configured in staggered- symmetric pattern

AAE 450 Spring 2010 Joe Buckley Orbiter Propulsion and Power  Propulsion –2 HiPAT 445 N with Hydrazine/N2O4  Power –5 ASRGs, 3 Li Ion batteries (1 spare of each)

Orbiter Thermal Management  MLI and heating tape Orbiter Attitude Determination and Control  Determination: Star cameras, sun sensors, gyros  Control: Thrusters, reaction wheels AAE 450 Spring 2010 Joe Buckley

Orbiter Control Issues  Controlling vehicle stack during Titan Entry  Blackout during atmospheric entry AAE 450 Spring 2010 Joe Buckley Orbiter Communications  0.1 degree pointing error  2 antennas –One fixed, One gimbaled  6 hours/ day communication to earth –6 hour continuous block possible

AAE 450 Spring 2010 Scientific Payload Airship Decisions  Driven by 4 propeller engines that are electrically powered by ASRGs  Everything except the propulsion system will be powered by 1 MMRTG, and 6 lithium ion batteries  Sun sensors, and a radar altimeter pointed forward will be added to provide position information and collision avoidance  The balloon has been proven to be able to withstand the heatloss to the atmosphere and able to sustain prolonged flight

Airship Decisions AAE 450 Spring 2010 Scientific Payload  Communications will be done with 1 gimbaled antenna  Drop probes will be the previously proposed pyramid design and will be dropped by parachutes from the exterior of the airship  The surface scoop will be the “claw” design which includes a drill and a suction system By Friday  Finalize a cruising altitude / flight path  Determine ASRGs required for propulsion

Lake Lander – Configuration Overview  Proceed as Planned  Payload –Submersible Probe Designed –Battery Powered –Communications by Cable  Propulsion –(2) Ducted Propellers on each Pontoon –Electrical Propulsion  Power –(4) ASRGs –(7) Li-Ion Rechargeable Batteries AAE 450 Spring 2010

Lake Lander – Configuration Overview  Structures –Kevlar Cable to lower submersible probe –Winch Motor –Spanning Structures Deck Spars  Communication –Gimbaled Antenna – to orbiter –Cryogenic Cable Intertwined into Kevlar – to submersible probe  Controls –Rudder –Servos, Accelerometers, Gyroscopes, Stepper Motors AAE 450 Spring 2010

Lake Lander – Unknowns  Trajectory – entry into atmosphere  Thermal Management –Insulation to maintain necessary temperature – endoatmospheric –Interplanetary cooling – exoatmospheric AAE 450 Spring 2010 Current Lake Lander Configuration Image by Alex Brunk

Race to the Finish Line…  Final Design Review: –Wed. March 10 th 7:30pm ARMS B071 –All team members welcome  Action Items: –Final Design Review decisions to be made (ongoing): –Current design decision document by Sunday 5pm d1JhZUg&hl=en –Project/vehicle names (each brainstorm a name with reasoning) Fri. March 5 th by 5pm &hl=en AAE 450 Spring 2010

Final Reminders  Section 1 – Final Design slides due Sun. by 5pm  CAD group – send Martin image files by Fri. 5pm AAE 450 Spring 2010

Concerns AAE 450 Spring 2010