![]() In: American institute of aeronautics and astronautics atmospheric flight mechanics conference and exhibit, 16–19 August 2004.Īnderson SB, Ernst EA, Van Dyke RD Flight measurements of the wing-dropping tendency of a straight-wing jet airplane at high subsonic mach numbers. Owens DB, McConnell JK, Brandon JM, Hall RM Transonic free-to-roll analysis of the F/A-18E and F-35. In: American Institute of Aeronautics and Astronautics Journal of Aircraft, Vol. Hall RM, Woodson SHIntroduction to the Abrupt Wing Stall (AWS) Program. In: 41st aerospace sciences meeting & Exhibit, 6–9 January 2003. Previous control command (°) \(\Delta \mathbf\)ĭeflection of control surface for s (s = aa, ea, r)ĬhambersJR, Hall RM Historical review of uncommanded lateral-directional motions at transonic conditions. Nonlinear control distribution function u 0 The evaluation result reveals that the proposed control method reduces effectively uncommanded lateral motions and improves the handling qualities of the aircraft. To evaluate the performances of the proposed control method, we perform the frequency-domain linear analysis and time-domain numerical simulations based on the mathematical model of advanced trainer aircraft. That is the additional augmentation control method, using angular acceleration measurement, that improves the flight characteristics using a feedback control technique based on the Incremental Nonlinear Dynamic Inversion (INDI). This paper presents a new design approach in which uncommanded lateral motions of the aircraft can be reduced even more than the existing methods. Besides, the feedback control methods using optimal control, adaptive and neural network control which do not provide a deterministic solution are limited to obtain the airworthiness certification. ![]() However, using only the existing control methods such as the feed-forward control methods as well as the configuration design can reduce limitedly the uncommanded lateral motion. To compensate for this drawback, Free-To-Roll (FTR) wind tunnel test is adopted as a method to identify the uncommanded lateral motions of the aircraft and improve the flight characteristics at the configuration design stage. According to the previous research results, this substantial phenomenon has occurred in a large number of the fighter aircraft programs, typically at the early flight test development stage, and a lot of budgets and efforts are required through the development period of the aircraft. This phenomenon caused by asymmetric wing flows makes it difficult to perform precision tracking or maneuvering in the transonic flight envelope. The Abrupt Wing Stall (AWS) at moderate Angle-of-Attacks (AoA) and transonic flight conditions can result in uncommanded lateral motions such as heavy wing, wing drop and wing rock that degrade handling qualities, mission performance and safety of flight for the aircraft.
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