1 / 11

International Aircraft Design Team - Spring 2008

Large Crowd Surveillance UAV. International Aircraft Design Team - Spring 2008. International Design Team. Aircraft Design projects since 1997 Virginia Tech and Loughborough University International collaboration Communication: Video Conferences E-mail Project Management Websites

tyne
Download Presentation

International Aircraft Design Team - Spring 2008

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Large Crowd Surveillance UAV • International Aircraft Design Team - Spring 2008

  2. International Design Team • Aircraft Design projects since 1997 • Virginia Tech and Loughborough University • International collaboration • Communication: • Video Conferences • E-mail • Project Management Websites • MSN, Skype • Various Competition wins and awards from NASA General Aviation Design competitions.

  3. Requirements RELIABILITY“1 or fewer uncontrolled crashes per 100,000 hrs of operation” • Cruise Speed: 50 knots • Top Speed: 70 knots • Range: 15 nautical miles • Endurance: 8 hours (minimum) • Service Ceiling: 10,000 ft (half fuel) • Operational Altitude: 2000 - 3000 ft • Minimum Turn Rate: 6 degrees/sec • Climb Rate: 200 ft/min (sea level) • MTOGW: 300 lb • Payload: 45 lb desired • Noise Levels: < 50 dBA at 200 ft • 10 knot crosswind landing capability • Conventional landing within a 50 ft by 250 ft

  4. Importance of Reliability • Airworthiness and Safety of Flight • Is it safe to fly overhead in large crowd situations ? • Is it expendable? • Is it capable of performing to specifications? • Acceptance • UAV restrictions due partly to unreliable systems • Key to winning confidence of FAA to regulate UAV flight • Lower long-term costs of UAVs • Increased availability of UAVs for missions

  5. Definition of Reliability • Reliability according to the DoD • “The ability of a system to perform its mission without failure, degradation, or demand on the support system.” • Mean Time Between Failure (MTBF) • Period of time a repairable system/component will perform between failures • Mean Time To Failure (MTTF) • Same as MTBF, but for non-repairable systems • What is aircraft failure? • Failure to return to base

  6. Current UAV Reliability F-16 (Manned) Mishap Rate: 3.5 per 100,000 hours

  7. Improving Reliability RQ-5/MQ-5 Hunter http://www.designation-systems.net/dusrm/m-155.html MQ-9 Predator http://www.airforce-technology.com/projects/predator/predator6.html • Methods • Redundant Systems • Backup Systems • Scheduled Maintenance • Diversification • Implications • Cost • Weight • Increase in maintenance responsibilities

  8. Main Failure Modes 1 1

  9. Summary of Key Reliability Issues • Engine/Propulsive Failure • Control/Communication Failure • Structural Failure • Human (Ground Crew) Error • Methodology Used • -Propulsion/Autopilot – Fault Tree Analysis • -Structure – Joint Probability Distribution Function (PDF)

  10. Fault Tree Analysis

  11. Structural Reliability

More Related