Preliminary Design Review. Michael Stephens, Eric Robinson, Alex Antonacci, Andrew Hellquist, Joe Backstrom, Bryan Overcast, Jeffrey Watters, Jonathan Melton, Marshall Moore, Matthew Lehmitz, Tal Wammen, Colin Lucas. October 27, 2011. Mission Overview. 3. 4. 2. 5. 1. 6.
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Preliminary Design Review Michael Stephens, Eric Robinson, Alex Antonacci, Andrew Hellquist, Joe Backstrom, Bryan Overcast, Jeffrey Watters, Jonathan Melton, Marshall Moore, Matthew Lehmitz, Tal Wammen, Colin Lucas October 27, 2011
Mission Overview 3 4 2 5 1 6
Scientific Mission Overview Characterize the performance of electrically active heat shielding Proposed method of reentry: • Electromagnetic Heat Shield Presenter: Tal Wammen
Engineering Mission Overview Develop a standardized probe and deployment system. Develop a reliable and reusable standard electronic system. Presenter: Tal Wammen
Theory and Concepts To design and build a standardized probe deployment system to test an advanced, electrically shielded reentry system. These concepts, as well as a standardized delivery mechanism, will provide a foundation to build future experiments. Presenter: Tal Wammen
Theory and Concepts • A strong magnet should repel charged particles. • Particles striking the payload impart energy on the probe causing heat. Research based from several papers regarding preventing radio black out. Presenter: Tal Wammen
Concept of Operations t ≈ 1.7 min Shedding of Skin t ≈ 4.0 min Probe Deployment t ≈ 2.8 min Apogee End of Terrier Malamute Burn t ≈ 8.2 min Chute Deploys t ≈ 15 min Splash Down t ≈ 0 min Launch Presenter: Tal Wammen
Success Criteria Reduce heat on reentry of a probe. Confirm results with control. Create a standardized probe deployment platform enabling future progression in the field. Presenter: Tal Wammen
System Overview 3 4 2 5 1 6
Subsystem Definitions Presenter: Tal Wammen
Subsystem Overview Presenter: Tal Wammen
Subsystem Overview Presenter: Tal Wammen
Critical Interfaces Presenter: Tal Wammen
System/Project LevelRequirement Verification Plan Presenter: Tal Wammen
User Guide Compliance Presenter: Tal Wammen
Sharing Logistics Who are we sharing with? • University of Northern Colorado • The possibility of a communication system between the AstroX payload and the UNC payload is being considered. Plan for collaboration? • Email, phone, road-trips to Greeley and Boulder • Communication with UNC on a weekly basis. • Grant UNC access to the AstroX private website. Presenter: Tal Wammen
Subsystem Overview 3 4 2 5 1 6
Subsystem: Magnet source • 100 seconds of activation • Must Sit for 5 Days • Must be reliable and safe. • Must perform well.
Subsystem: Wireless • Must transmit data after reentry. • Critical to success. • Must be able to operate legally.
Subsystem: Power Supply • 3 Minutes of Power • Must Sit for 5 Days • Large, Quick Draw Needed
Subsystem: Heat Shielding Silicone • Inexpensive • Reliable • Durable
Subsystem: Ejection System Spring w/Ribbon • Safe • Effective • Simple • Reliable
Subsystem: Nose Geometry • Nose Assembly • Stable • Create Drag To Reduce Plasma Buildup
Subsystem: Fin Attachment • Strong • Must survive Reentry • Create Drag to Stabilize Craft • Must Be Inexpensive
Subsystem: Temperature sensor • Thermocouple • Pros • High temperature range • Cons • Additional hardware needed to interface with controller Integrated Chip Pros Cheap Easily interfaces with controller Cons Poor temperature range
Conceptual Model 3 4 2 5 1 6
Electromagnet Modeling 3 4 2 5 1 6
Electromagnetic Equations Ampere’s Law: Simplified to: Where B is the magnetic flux vector. N is the number of turns. L is the length, and I is the current. μ is μo * μr, where μo is the permeability of free space (4πE-7 H/m), and μris the permeability of soft iron (200).
Electromagnet Matlab Code Equations implemented in matlab. Takes variety of parameters including: diameter, length, wire gauge and internal battery resistance. Another script loops through available parameters building potential electro magnets.
Prototyping Design 3 4 2 5 1 6
Subsystem: Risk Matrix/Mitigation • RSK1: Probe fails to be released. • RSK2: Radio signal not acquired before splash down. • RSK3: Probe fails during reentry. • RSK4: Fins shear during reentry. • RSK5: Recovery system fails.
Prototyping Plan • Prototyping will begin later this month and carry into next semester Electromagnet • Fabricate and Test Ejection System • Fabricate and Test Parachute System • Fabricate and Test Presenter: Tal Wammen
Project Management Plan 3 4 2 5 1 6
Organizational Chart Project Manager Shawn Carroll Engineering Faculty Advisor Dr. Rob Erikson Physics Faculty Advisor Dr. Paul Johnson Team Leader Tal Wammen Payload Ejection System Michael Stephens Marshall Moore Bryan Overcast Alex Antonacci Advanced Heat Shield System Michael Stephens Joe Backstrom Jonathan Melton Andrew Hellquist Colin Lucas Alex Antonacci Jeffrey Watters Matthew Lehmitz Eric Robinson Bryan Overcast Aeroframe/Probe Housing Jonathan Melton Jeffrey Watters Joe Backstrom Andrew Hellquist Eric Robinson Electrical Power System Michael Stephens Marshall Moore Matthew Lehmitz Colin Lucas Presenter: Tal Wammen
Mechanical Schedule Major Mechanical Milestones: • Design Freeze at CDR (11/29/2011) • Blueprints submitted for manufacturing by CDR • Mechanical prototype constructed mid-January, 2012 • Mechanical prototype fully tested by end of January, 2012 • Impact and submersion testing • Electromagnet Testing • Plasma Testing • Structural Testing • Drop Testing Presenter: Tal Wammen
Electrical Schedule Major Electrical Milestones: • Electrical Schematics completed by CDR (11/29/2011) • Components ordered by end of November • Electrical assembly and testing starting this month • Control function test • Telemetry and SD card output test • Fully functioning payload by early next semester Presenter: Tal Wammen
Budget Mass Budget (14 lbs) • Structure (4lb) • Probe Housing (1lb) • NASA Structure (3lb) • Probe (6.5lb) • Electromagnet (5lb) • Aeroshell(1lb) • Parachute(0.5lb) • Ejection System (0.5lb) • Electrical System (2lb) • Battery(1lb) Presenter: Tal Wammen
Budget Presenter: Tal Wammen
Work Breakdown Structure Aeroframe/Probe Housing Payload Ejection System (PES) • Finalize Schematics • Design Freeze at CDR • Order Parts by End of Fall Semester • Build Circuits • Test Systems • Finalize Design • Design Freeze at CDR • Submit Work Request • Test Prototype Advanced Heat Shield System • Finalize Design • Design Freeze at CDR • Order Parts by End of Fall Semester • Build Prototype • Test prototype Presenter: Tal Wammen
Conclusions 3 4 2 5 1 6