Week 8 Thursday (3/3)
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1 Week 8 Thursday (3/3) Courtney McManus
2 Today s Schedule Group Roll Call/Announcements Section 1 Presents Dr. Longuski shall impart wisdom upon us Group break-out/prepare for FDR C. McManus Project Manager
3 Final Design Review is next week! Thursday, March 10, 6-8 pm ARMS 1103 Format will be similar to CDR Each vehicle group presents Some technical groups present Everyone please try to make it Let me know if you absolutely cannot McManus, Courtney Project Manager
4 Schedule After Spring Break McManus, Courtney Project Manager
5 Time Presenter Group 8:40 Courtney McManus PM 1 8:45 Austin Hasse Aero 2 8:51 David Schafer Att/Con 3 8:57 Paul Frakes Att/Con 4 9:03 Sarah Jo De Fini Comm 5 9:09 Megan Sanders Mis Des BREAK :35 Trieste Signorino MisDes 7 10:41 Drew Crenwelge Power 8 10:47 Elle Stephan Power 9 10:53 Jared Dietrich Prop BREAK :10 David Wyant Prop 11 11:16 Michael Hill Prop 12 11:22 Zachary Richardson HF 13 11:28 Ben Stirgwolt HF BREAK :45 Andrew Curtiss StrcThrm 15 11:51 Kim Madden StrcThrm 16 11:57 Chris Luken 17 12:03 Alexander Roth
6 Austin Hasse : 4 th Presentation Job Description 3/ 3/ 2011 Aerodynamics Group Leader CTV Group Member Crew Capsule Group Member Tasks Parachute Sizing for Capsule Capsule Storage for Ballute, Tethers, Helium Tank, Parachute Preliminary CATIA Models for Ballute, Parachute Hasse, Austin Aerodynamics
7 Parachute Design Parachute Values Single Parachute Design by Austin Hasse Single Chute Radius = m Packed Volume =.313 m^3 Mass = kg (.36 T) Multi- Parachute Design by Austin Hasse Triple Shoot Radius = m Pack Volume (3) =.47 m^3 Mass = 539.7kg (.54 T) Hasse, Austin Aerodynamics
8 Crew Capsule Storage Sizing Required Volume Total Height = 3.13 m Bottom radius = 1.99 m Ballute/Tethers Volume= 8.82 m^3 Height = 2.98 m Parachutes Volume = 0.47 m^3 Height =.04 m Helium Tank Volume = 1.13 m^3 Height =.11 m Section View of Ballute / Parachute Storage by Austin Hasse Hasse, Austin Aerodynamics
9 : Week 8 Presentations Vehicle Groups: - Communication Satellites - Rovers Schafer, David Tasks Completed: - Small Forces at Relay study - Rescue Rover ADCS study - CMG Sizing Code ADCS
10 Space Environmental Forces and Torques (Relay Satellite) (No Gravity) Environmental Forces (neglecting gravity) combine to N Maximum environmental torque (with current configuration) becomes Nm CMG set needed to counteract using 0.1 kw of energy has mass of just 1.2 kg and volume of 4.5x10-4 m 3 David Schafer Schafer, David ADCS
11 Rescue Rover Control 4 separate gimbaled thrusters (2 DOF) Requires around 135 kg of propellant for full roundtrip (attitude control only) Requires fairly powerful ADCS thrusters (about 2.5 kn) Working to reduce thruster force by increasing propellant mass and burn time ADCS thrusters Future Work: Add power variance to CMG code Finalize Rover thrusters Return to CTV and STV groups and pick up work Schafer, David ADCS
12 Paul Frakes : Week 8 Presentations Tasks Accomplished: STV Steering law: propellant mass requirement Comm. dish pointing Researched capsule docking problem Frakes, Paul Attitude Determination and Control Systems
13 STV Steering Law Assumptions: Time of flight = 2.77 yrs Thrust in the direction of velocity Model as shown right (use Parallel Axis Theorem to calculate I zz ) Thrust: 10 N I sp = 220 s No spin Propellant mass required: 484 kg Collaboration with Propulsion Group required to determine system mass Graphic courtesy Sonia Teran Frakes, Paul Attitude Determination and Control Systems
14 STV Comm. Dish Pointing / Crew Capsule RCS Propose using Canfield joint for both vehicles 3 DoF system enabling full hemispherical pointing TRL ~4 Proposed by NASA for Reaction Control System on Orion Crew Capsule Reduces number of required RCS thrusters on capsule Using one type of gimbal reduces overall system complexity, development cost No mass/power/ volume specs found Frakes, Paul Attitude Determination and Control Systems
15 Sarah Jo DeFini : Week 8 Presentations Vehicle Groups: Supply Transfer Vehicle ISPP Stations This week s focus: Omni-directional link budget code DeFini, Sarah Jo Communication
16 ISPP Station Communication Telemetry and Low-Quality Visual Storage Tanks Harvester ISPP Station Harvester Station-Satellite RF dish Route through CTV when available Station-Tanks Data sent through cable Station-Harvester: Wireless Communication Coverage Area ~150 m DeFini, Sarah Jo Communication
17 Mass! Power! Volume! Wireless Antennas Mass: kg each 1 ISPP + 3 harvesters = 0.14 kg Power: 0.1 W each 1 ISPP + 3 harvesters = 0.4 W Volume: m^3 each 1 ISPP + 3 harvesters = m^3 RF Dish Mass: 0.42 kg Power: 1.6 kw Volume: <0.05 m^3 (folded) DeFini, Sarah Jo Communication
18 Mission Design Supply Launch Vehicle (Group Lead) Rover Ascent/Descent Tasks Rescue Rover Trajectory Investigating Relay Satellite Possibilities Launch Vehicle Presentations Sanders, Megan Mission Design
19 km Rescue Rover Trajectory Rescue Rover Ceres Surface Burn Coast Flat Ceres Assumption 45 angle during burn 689 km range 60 sec hover when landing km Sanders, Megan Mission Design
20 Trajectory Results Outbound Trip Return Trip Round Trip Burn Propellant Mass (kg) Propellant Hover Propellant Mass (kg) Total Mass of Propellant (kg) Volume of Propellant (m 3 ) Trajectory Characteristics Burn Time (min) Trip Time (s) Outbound Trip Return Trip Total Sanders, Megan Mission Design
21 Meet downstairs at 10:30.
22 : Week 8 Presentations Vehicle Groups: - CTV Launch Vehicles (Lead) - CTV Transfer Vehicle Signorino, Trieste Mission Design
23 CTV Return from Ceres Assumptions: Two Engines: Low Thrust and Kick Engine Isp = 5000s for Low Thrust and Isp = 458.3s for Kick Using Chemical Kick Engine finert kick = Using MPD for Low thrust Engine finert lowthrust = 0.5 Phases of Return Trip: Starting in LCO (50km) Perform V at Ceres to begin trip home Low thrust spiral until CTV crosses Earth s orbit Obtain V for Hyperbolic trajectory goes to Aerodynamics Goal Return the CTV from Ceres without violating inert mass fraction set by the individual engine. Signorino, Trieste Mission Design
24 CTV Return Trajectory TOF (yrs) Vc (km/s) M prop_kick (T) finert kick Thrust (N) M prop_lt (T) finert lt V (km/s) Future Work: Implement method on outbound trip for CTV Refine numbers as configuration is finalized Signorino, Trieste Mission Design
25 Drew Crenwelge 03 March 2011 Power Group: Nuclear Reactor Update - CTV Radiator Sizing CTV Ceres Surface Configuration - CTV Crenwelge, Drew Power Group
26 Nuclear Reactor Update Power (kwe) Total Mass (kg) PMAD Heat Reject Power Conv. HSHX Shield (LiH/W) Reactor Specific Power (kg/kwe) Width (m) 1.8 Height (m) 1.55 Volume (m3) ~5.0 Radiator Area (m2) 3084 Crenwelge, Drew By Drew Crenwelge Power Group
27 CTV Crane/Arm Steps: Retract condo latch onto moveable brace. Begin rolling outward towards end of track. Rotate condo 180 deg. Lower condo to surface. Future Work: Determine dimensions of track (length, mass, etc). By Drew Crenwelge Crenwelge, Drew Power Group
28 Elle Stephan 3 March 2011 Communications Satellite Vehicle Lead ISPP Harvester Design Stephan, Elle Power
29 Ceres Orbiting Satellites Mass [kg] Power Generated [kw] Area [m²] Solar Array * Per satellite Possible hinge to allow bending of arrays to ensure fitting inside Aries V Stephan, Elle Power
30 ISPP Harvesters Total Collection Time 1 Year 2 Years 3 Years 4 Years 5 Years Filled Mass [T] Power [W] Volume [m³] *Based on 24hr day per harvester 2 trips per 24 hr day Li-ion rechargeable battery charged once a week **Will continue to research materials capable of fulfilling harvester requirements Stephan, Elle Power
31 Dietrich, Jared N Propulsion
32 Kick Motor goes Chemical Nuclear Thermal Issues: Assumption of an Impulsive burn is not valid Chemical Replacement: Constraints must provide a 10 km/s Delta V 1 Limited by Isp of ~450 sec for bipropellants 2 Mpay = T (Vehicle mass before kick) f_inert = 0.04 (typical chemical value for bipropelllants) 3 Mprop 3, T Minert 129 T Mf 379 T Mo 3,476 T M (H2) 516 T Vol (H2) 6703 m^3 M (O2) T Vol (O2) 2263 m^3 Thrust 490 kn No. of Motors m LO2 LH2 Ceres Kick 2.14 m Dietrich, Jared N Propulsion Image: Jared Dietrich
33 Kick Motor Jettison/CAD Choice of Motor to meet mission requirements: RL-10B-2 RL-10B-2 (Pratt & Whitney) The most reliable, safest, and highest-performing upper-stage engine in the world. Total Kick Motor Mass = 1.2 T Interstage Mass (Ares V) = 9.07 T 4 d Total Mass Reduction = 10.3 T (~1%) Ceres Motor Prop Mass = 20 T* Future Work: 1. Determine CG effects 2. Consider Same process for MPDT s 3. Size new Propellant tanks STV: Jared Dietrich Dietrich, Jared N Propulsion
34 Start at 11:10.
35 David Wyant March 3, 2011 Technical Group: Propulsion Vehicle Groups: Rovers Crew Ascent Vehicle Rover Engine and Drive Train Sizing Wyant, David Propulsion
36 Drive Train & Suspension Exploration Rover Mass (kg) Power (kw) Volume (m 3 ) Engine Transmissions kg N/A Suspension 200 kg N/A N/A Exploration Rover Stats Dry mass: kg Power: kw Volume: m 3 Exploration Rover Will utilize Zero-turning Radius Movement. Requires multiple, Continuously Variable Transmissions Wyant, David Propulsion
37 Rescue Rover Engine Sizing Engine Mass (kg) Power (kw) Volume (m 3 ) Main Thruster N/A ADCS Thrusters 69.4 N/A.024 Maneuvering Motors Main engine 40 kn Thrust 15:1 Throttling Ratio Propellant Mass: kg Maneuvering Motors Wheels to maneuver for airlock docking Will be identical to Exploration rover wheels Wyant, David Propulsion
38 Michael Hill : Presentation 4 Team Tasks: Propulsion Group Leader CTV Propulsion Ceres Regime Engine Kick Engine Hill, Michael Propulsion
39 Ceres Regime Engine Require kn to kn Isp = kn Isp = kn T/W = System Combustion Chamber 9.67 Nozzle 2.50 Injector 7.57 Feed Cooling O 2 Turbomachinery 1.27 H 2 Turbomachinery 4.65 TOTAL: Mass (kg) / Engine Hill, Michael Propulsion
40 Kick Engine Will use LH 2 /LOX Instead of NTR F = 1,500 Isp = sec T/W = System Mass (kg) / Engine Combustion Chamber Nozzle Injector Feed Cooling O 2 Turbomachinery H 2 Turbomachinery 5.19 TOTAL: Michael Hill Hill, Michael Propulsion
41 Zachary Richardson Week 8 Presentation: Group Lead: Human Factors & Science - ISPP Production and Sizing Updates - ISPP Timeline Trade Study Tasks Accomplished: Sizing of Electrolysis/Oven/Production rates for ISPP Updated ISPP schematic design with fellow ISPP group members Updated ISPP production values to fit mission timeline Richardson, Zachary Human Factors & Science
42 Total ISPP production, assumptions and origin of requirements Updated Total Production Values (for 1 ISPP station) *Water extracted (T) 38.7 **Hydrogen extracted (T) **Oxygen extracted (T) *Stored at Ceres ambient temp (ice) **Stored in liquid form Note: Numbers are from various worst case scenarios so these values will most likely be reduced Production values from the following sources: Rescue/Exp. Rovers Return and Transfer engines Life Support Assumptions: Rescue: 1 trip per week Rovers expend 100% of water and oxygen /trip Low Thrust and Ceres Kick are for worst case where final V arriving at Earth = 13km/s Richardson, Zachary Human Factors & Science
43 ISPP Production Trade Study Production time (years) Regolith (T/day) Mass of Oven (kg) Volume of Oven (m^3) Power Oven Required (kw) Mass of Electrol izer (kg) Volume of Electroli zer (m^3) Power of Electr olizer (kw) Reactor mass (kg) Total ISPP mass (kg) * * Upcoming Tasks Assist in thermal control calculations and final Harvester calculations Finalize entire ISPP facility masses for Design Freeze Determine final ISPP schematics including all components of the facility Richardson, Zachary Human Factors & Science
44 Ben Stirgwolt : Week 8 Presentations Human Factors & Science: Rover Docking with CTV CTV Air Circulation Stirgwolt, Ben Human Factors & Science
45 Rover Docking The Important Numbers o Max lifting height: 5.7 m o Mass: 41 kg o Power: 2.8 kw o Volume (retracted): 6.7 m 3 Stirgwolt, Ben Human Factors & Science
46 CTV Air Circulation Requirements [2]: o Airflow: m 3 /min o Exhaust velocity: < 76 m/min o Ensure fresh air at crew member s head and keep acoustic exposure low Totals: (Including--Ducting, Common Cabin Air Assembly, Individual Bedroom Fans) o Mass: 405 kg o Power: kw o Volume: 1.75 m 3 Stirgwolt, Ben Human Factors & Science
47 Start at 11:45.
48 Andrew Curtiss Groups - Structures & Thermal - Crew Capsule - Supply Transfer Vehicle - Supply Launch Vehicle Accomplishments - STV Design/Configuration - Launch Vehicle Estimations - Crew Capsule Swivel Arm Design - STV module connector, manifest, hydrogen tankage, radiation shielding, thermal control system, landing gear design
49 Hydrogen Tankage Current LH2 Mass Requirement = kg Current LH2 Volume Requirement = m^3-8 Tanks with dimensions on right are required for STV -Tanks reused for ISPP Stations -Tanks are empty at Ceres Arrival -Fits inside slightly modified Ares V shroud -Mass of hydrogen is lower than Ares V capacity which means this payload can possibly be used on a small launch r vehicle Mass of Tank = t Volume of Tank = m^3 Payload Mass Per Tank = t Payload Volume Per Tank = m^3 Total IMLEO = t Total IVLEO = m^3 Picture by: A. Curtiss
50 Connection Arms Possible Configurations: 1. 4 L shaped arms, 2 detach for rotation Total Mass = kg Total Volume = m^ L shaped arms Total Mass = kg Total Volume = m^ A shaped truss structures Total Mass = kg Total Volume = m^3 Picture by: A. Curtiss
51 Kim Madden Week 8 Presentation, 3/3/11 - Structures & Thermal Control - Exploration and Rescue Rover - Group Lead This week: -Thermal Control for Rovers -Dividing Wall in Exploration Rover -Started Rover Catia Models
52 Thermal Control for Rovers MLI covers entire surface of rover to help prevent heat loss Al plates conduct rejected heat from electronics to heat pipes Plate is 0.5 m^2 distributed under all electronics, 5 mm thick Assume electronics are 65% efficient Heat pipe uses water to carry heat from plates to radiators under rover 8 (Exploration) or 4 (Rescue) sets of radiators to expel heat Multiple sets reduce size of each radiator Radiators fold up when desired temp is reached (293 K) to stop heat rejection Heat pipes have rubber connectors so they can bend, also stops water flow Exploration Rescue Mass (kg) Power (kw) Volume(m^3) Mass (kg) Power (kw) Volume(m^3) Heat Pipe (water + pipe) Radiators MLI Al Conducting Plates Total
53 Schematic of Thermal Control Heat out due to colder temps on Ceres Rover Heat in due to electronics in Rover Heat out via heat pumps and radiators Electronics Conducting Plate Radiators Heat Pump Picture by Kim Madden
54 Luken, Chris (Web Developer) Attitude Determination and Control Systems
55 Max Frontal Area 1520 m 2 Min Frontal Area 450 m 2 f o 1353 W/m 2 CTV Diagram Courtesy of Frank Fortunato Environmental Torque Solar Radiation Solar Wind Micro-meteorites Required m p 41.6 kg kg Negligible Luken, Chris (Web Developer) Attitude Determination and Control Systems
56 ΔH H ω = rpm CTV Diagram Courtesy of Frank Fortunato Inertia 6x10 8 kg-m 2 Mass 230 T F att Isp 85 N delivered 328 (NTO, MMH) Attitude Thruster Pulse Arc ~ 16 deg Pulse Time ~ 0.6 s Illustration by Chris Luken Maneuver Propellant Mass Delivered ΔV Turning 3 Rev per Pulse T m/s Turning Fixed Efficiency T m/s Luken, Chris (Web Developer) Attitude Determination and Control Systems
57 Alexander Roth : Week 8 Presentations Technical Groups: Aerodynamics CAD Vehicle Groups: CTV Crew Capsule Crew Launch Vehicle Cargo Launch Vehicle Tasks Accomplished: Fitting CTV components into the Ares V payload shroud Modeled components for CTV and Crew Capsule Roth, Alexander Aerodynamics & CAD
58 Placement & Fitting into Ares V 4.4 m Items & Order of Removal in LEO: All CTV Compartments 2.1 MW Reactor Radiator Section Transmission Dish Receiving Dish UHF Dish 3 NTR Kick Motors MPD Slider Rail 4 MPDs Tether Spindle Tether Line Total Volume: m 3 of 1410m 3 Roth, Alexander 7.5 m 18.7 m 8.8 m Aerodynamics & CAD (1) Aerocapture Maneuver (at altitude h) CAD Model by Alexander Roth Inside Components by Trieste Signorino & Brendon White
59 Other CAD Models Made MPDs with Slider Rail Crew Capsule and Mounting Arms CAD Models by Alexander Roth Roth, Alexander Aerodynamics & CAD
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