Aeroservoelastic Optimization under Stochastic Gust Constraints

Stanford, Bret K

关键词: AEROSERVOELASTICITY;    CONTROL SURFACES;    DESIGN ANALYSIS;    DESIGN OPTIMIZATION;    FLIGHT OPTIMIZATION;    STATIC LOADS;    STOCHASTIC PROCESSES;    TRAILING EDGES;    TRANSPORT AIRCRAFT;    BENDING MOMENTS;    BUCKLING;    DEFLECTION;    DYNAMIC RESPONSE;    FLEXIBLE WINGS;    GUST LOADS;    STRUCTURAL DESIGN;   

RP-ID  :  NF1676L-28563

学科分类：航空航天科学

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

This work considers the aeroservoelastic optimization of a highly flexible transport aircraft wingbox with several control surfaces distributed along the trailing edge. The steady deflections of the control surfaces are designed to alleviate static maneuver loads, while the unsteady deflections are designed to alleviate stochastic continuous gust disturbances. Spatially-detailed unsteady stochastic stress and panel buckling constraints are formulated via modal acceleration, and by methods to locate the most-probable failure point along an equal-probability hypersurface. For the case considered here, it is found that the inclusion of such gust constraints during optimization presents a sizable structural mass penalty. In some cases, this mass penalty can be completely recovered with controlled gust load alleviation.