The Twin ASH-25 is a low-cost High Altitude Long Endurance (HALE) Aircraft, built up from various ASH-25 glider components. As a part of the Twin feasibility study, an aeroelastic analysis has been performed, using the finite element code MSC/NASTRAN. A finite element model of the flexible aircraft has been used to calculate maneuver loads, gust loads, control reversal-, divergence- and flutter speed. The propeller whirl speed has been calcualted analytically. Purpose of this analysis was to check if the Twin design complies with FAR-23 regulations concerning aeroelasticity phenomena. Flutter occurred and a design modification has been proposed to comply with FAR 23. Design and manufacturing constraints considering the aeroelastic behavior of the Twin have been determined by a sensitivity analysis. The analyses show that the modified design complies with FAR 23 regulations and that the design is feasible concerning aeroelasticity regulations.
Aeroelastic Analysis of the Twin ASH-25 High Altitude Long Endurance Aircraft Using MSC/NASTRAN
1997
284 pages
Report
No indication
English
Unmanned high altitude long-endurance aircraft
AIAA | 1989
|Aeroelastic optimization using MSC/NASTRAN
British Library Conference Proceedings | 1993
|Aeroelastic addition to NASTRAN
TIBKAT | 1979
|