DESIGN CRITERIA FOR PARTIAL SPANLOADER AIRPLANE

Award Information
Agency: Department of Defense
Branch: Defense Advanced Research Projects Agency
Contract: N/A
Agency Tracking Number: 9491
Amount: $49,575.00
Phase: Phase I
Program: SBIR
Awards Year: 1989
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
825 Myrtle Ave, Monrovia, CA, 91016
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Dr P B S Lissaman
 (818) 357-9983
Business Contact
Phone: () -
Research Institution
N/A
Abstract
THERE IS NO ACCEPTED PRELIMINARY DESIGN METHOD FOR HIGH ALTITUDE, LONG ENDURANCE (HALE) VEHICLES. IMPORTANT TO NASA, SDIO AND ALL BRANCHES OF DOD, THEY ALL HAVE VERY LONG SPANS, VERY LIGHT WING LOADING, AND VERY LARGE FUEL/PROPULSION FRACTIONS. MOST CONFIGURATIONS ARE PARTIAL SPAN-LOADERS, THUS ATMOSPHERIC TURBULENCE IS THE CRITICAL DESIGN LOADING. WITH NO SIMPLE ENGINEERING METHOD TO ESTIMATE BENDING MOMENT ON A TURBULENCE-LOADED WING OF THIS TYPE, PRELIMINARY DESIGN PROCEDURES ARE VERY ARBITRARY. THE PROPOSED WORK WILL PROVIDE A DESIGN CRITERION FOR PARTIAL SPAN-LOADERS, WITH CENTRAL AND OUTBOARD POINT LOADS AND OF QUITE GENERAL CONFIGURATION IN GENERAL ATMOSPHERIC TURBULENCE EXCITATION, BY SOLVING THE AEROELASTIC EQUATIONS AND DETERMINING THE FLUCTUATING MOMENTS. COMBINING THIS WITH THE MISSION SCENARIO, THE FAILURE PROBABILITY CAN BE CALCULATED. DESIGN CRITERIA FROM WHICH MOMENTS AND FAILURE PROBABILITIES CAN BE DETERMINED WILL BE DEVELOPED IN GRAPHICAL FORM OR AS SIMPLE COMPUTER CODES. THESE WILL BE OF VALUE TO ALL GROUPS CONCERNED WITH HALE TECHNOLOGY, INCLUDING DOD PROCURMENT AGENCIES, AEROSPACE MANUFACTURERS AND GROUPS PERFORMING SYSTEM EVALUATION AND TECHNICAL ASSESSMENT. THE WORK LEADS TO A SECOND PHASE FOR MORE COMPLEX CONFIGURATIONS IN WHICH MORE COMPREHENSIVE GUIDELINES WILL BE DEVELOPED.

* Information listed above is at the time of submission. *

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