Accession Number:

ADA522686

Title:

An Evidence Theoretic Approach to Design of Reliable Low-Cost UAVs

Descriptive Note:

Master's thesis

Corporate Author:

VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG

Personal Author(s):

Report Date:

2009-07-28

Pagination or Media Count:

121.0

Abstract:

Small unmanned aerial vehicles SUAVs are plagued by alarmingly high failure rates. Because these systems are small and built at lower cost than full-scale aircraft, high quality components and redundant systems are often eschewed to keep production costs low. This thesis proposes a process to design in reliability in a cost-effective way. Fault Tree Analysis is used to evaluate a systems unreliability and Dempster-Shafer Theory Evidence Theory is used to deal with imprecise failure data. Three unique sensitivity analyses highlight the most cost-effective improvement for the system by either spending money to research a component and reduce uncertainty, swap a component for a higher quality alternative, or add redundancy to an existing component. A MATLAB registered trademark toolbox has been developed to assist in practical design applications. Finally, a case study illustrates the proposed methods by improving the reliability of a new SUAV design Virginia Techs SPAARO UAV.

Subject Categories:

  • Pilotless Aircraft
  • Manufacturing and Industrial Engineering and Control of Production Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE