Results 201 to 210 of about 12,185,351 (242)
Some of the next articles are maybe not open access.
The Aeronautical Journal, 1970
Control of flight is essentially control of lift. When one proposes—as we shall do here—to tamper with one of the most fundamental principles of aircraft control, it is evident that this may have far reaching repercussions and that such a venture cannot therefore be undertaken lightly.
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Control of flight is essentially control of lift. When one proposes—as we shall do here—to tamper with one of the most fundamental principles of aircraft control, it is evident that this may have far reaching repercussions and that such a venture cannot therefore be undertaken lightly.
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Symmetric Hessian propagation for lifted collocation integrators in direct Optimal Control
2016 American Control Conference (ACC), 2016Direct optimal control first discretizes the continuous time Optimal Control Problem (OCP) and then solves the resulting Nonlinear Program (NLP). Implicit integration schemes are used for the numerical simulation of stiff or implicitly defined dynamics.
Rien Quirynen +2 more
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LAMS B-52 Flight Experiments In Direct Lift Control
SAE Technical Paper Series, 1969<div class="htmlview paragraph">This paper reports the results of a limited flight evaluation of Direct Lift Control (DLC) on a modified B-52 aircraft. The evaluation was made in conjunction with concluding flights of the Load Alleviation and Mode Stabilization (LAMS) Program and represents the first flight testing of a blended closed loop DLC ...
J. A. Lee, R. P. Johannes
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considerations of some JET-DEFLECTION PRINCIPLES for - - directional control - - lift
SAE Technical Paper Series, 1958<div class="section abstract"><div class="htmlview paragraph">THE performance characteristics of various devices applicable for jet directional control, lift augmentation, and VTOL-STOL studied at the NACA Lewis Laboratory are discussed, including jet deflection devices applicable to the conventonal round nozzle and novel nozzle ...
U. H. von Glahn, J. H. Povolny
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Design and Flight Testing of Nonlinear Autoflight Control Laws Incorporating Direct Lift Control
2013This publication describes how direct lift control has been incorporated in a nonlinear autoflight control algorithm. Direct lift control demonstrated its use in earlier aircraft designs. In two recent internal DLR projects, accurate flight path tracking in atmospheric disturbances was an important research goal, where direct lift control could ...
Lombaerts, Thomas, Looye, Gertjan
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Direct-lift design strategy for longitudinal control of hypersonic aircraft
Journal of Guidance, Control, and Dynamics, 1994A longitudinal control design called the G-command, alpha follow-up is described that significantly improves the lag between pitch angle and flight-path angle responses associated with hypersonic flight. The design technique relies on classical, successive loop closures to determine the control architecture and introduces a direct-lift control strategy
Phuong Vu, Daniel J. Biezad
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Identification of actuation system and aerodynamic effects of direct-lift-control flaps
Journal of Aircraft, 1993A maximum likelihood parameter estimation method for nonlinear systems has been applied to flight data of the research aircraft ATT AS (advanced technologies testing aircraft system). The emphasis is on modeling and identification of 1) dynamics and nonlinearities of actuation systems for the direct-lift-control (DLC) flaps, and 2) their aerodynamic ...
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RBFNN Adaptive Longitudinal Direct Lift Control of Carrier-Based Aircraft Landing
2021In this paper, an RBFNN adaptive control based longitudinal direct lift flight control system is designed, aiming at the demand for precise landing for carrier-based aircraft. Direct lift control (DLC) scheme is used to enhance the aircraft control maneuverability by introducing flap channels and to achieve rapid correction of vertical disturbances. An
Xiaoyun Sun +5 more
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Direct Lift Control of Aircraft Based on Adaptive Fuzzy Dynamic Inverse
Proceedings of the 2019 4th International Conference on Robotics, Control and Automation, 2019In order to deal with the problem of direct lift control of aircraft, an adaptive fuzzy dynamic inverse controller is designed. The dynamic inverse controller is used to realize the direct lift control of the aircraft. The fuzzy controller is used to dynamically adjust the parameters of the PID controller to improve the dynamic characteristics and ...
Hongyu Liang +3 more
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Evaluation of maneuverability of aircraft equipped with direct lift control system
23rd Atmospheric Flight Mechanics Conference, 1998Classic handling performance criteria allow evaluating properties of aircraft equipped with typical flight control systems. New methods of aircraft control, like thrust vectoring, as well as aerodynamics configuration modification of aircraft, require employing other criteria for evaluating flying qualities.
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