tailieunhanh - Encyclopedia of Smart Materials (Vols 1 and 2) - M. Schwartz (2002) Episode 2

Tham khảo tài liệu 'encyclopedia of smart materials (vols 1 and 2) - m. schwartz (2002) episode 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Figure 22. Achievable roll performance by combining leading and trailing edges. a ề UJ Figure 24. Usable range of aeroelastic effective tional and advanced active aeroelastic concepts. L_ 1 Vmin Rigi Dynami for example by an all-movable aerodynamic surface that has adaptive rotational attachment stiffness. This also provides high effectiveness at low speeds and excessive loads from diverging components or flutter instabilities at high speeds can be avoided. The usable aeroelastic effectiveness for conventional concepts is rather limited between take-off and cruise speed. Aileron reversal usually occurs between the cruise speed and limit speed and too high an effectiveness of leading edge surfaces must be avoided at the limit speed. On the other hand adaptive all-movable concepts can provide high effectiveness at all speeds and avoid excessive loads at the high end of the speed envelope as indicated in Figs. 23 and 24. This means for example that a stabilizer surface can be built smaller than would be required by rigid aerodynamic low-speed performance. NEED FOR ANALYZING AND OPTIMIZING THE DESIGN OF ACTIVE STRUCTURAL CONCEPTS Of course active materials and structural components together with the stimulating forces need a correct Active aeroelastic concepts Range of aeroelastic effectiveness on conventional designs Figure 23. Aeroelastic effectiveness of conventional and adaptive-all-movable active aeroelastic concepts. Range of effectiveness for advanced active aeroelastic concept description in theoretical structural or mu analysis and optimization MDAO models Once this is provided the actively deform needs another approach for static aeroelasti deflections of selected control surfaces of a has conventional control surfaces can be pr aeroelastic analysis. For an actively defor initial deformations without external loads determined for example by static analysis. As described before the deformations ach junction with the distribution of external loads are .