A multi-point approach for aerodynamic modeling in complex flow-fields

Jaramillo, Paul; Cho, Yongseung; Nagati, M. G.

doi:10.2514/6.1994-3470

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…The logical choice to design the algorithm will be to minimize quantities J, =(K, -l)i+i (16) J, =(KR -l)H+G (17) Minimizing above quantities implies reducing the magnitudes of the linear and angular momentum vectors using external forces and moment. To minimize the magnitudes of the linear and angular momentum vectors, force and moment components should be applied to linear and angular momentum vector components from the opposite direction.…”

Section: Outimal Control Approach For Momentum Vector Controlmentioning

confidence: 99%

Momentum vector control for spin recovery

Lee

Nagati

2000

38th Aerospace Sciences Meeting and Exhibit

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A method for obtaining recovery controls from nonlinear flight conditions such as spins, using momentum vector control, is presented. In a spin, the large angular velocity and high angles of attack the airplane experiences make it diffkult to control. This loss of control is a serious cause of aviation accidents. In this study, a systematic approach to momentum vector control is proposed. To arrest rotation and also to recover from the spin, the direction and magnitude of linear and angular momentum vectors are effected to restore their steady-state and/or pre-spin entry values. Required control surface deflections to recover from spin are computed by minimizing an objective function consisted of linear and anklar momentum terms. Simulated time histories using data for a light single engine general aviation aircraft, are used to validate this proposed approach. The method produced controls time histories which effected recovery from both a steep and a flat spin. These results indicate the validity and reliability of the proposed approach.

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Section: Outimal Control Approach For Momentum Vector Controlmentioning

confidence: 99%