Dynamics modeling and control of a transport aircraft for ultra-low altitude airdrop

Rapid trajectory planning of a reusable launch vehicle for airdrop with geographic constraints

“…3 Therefore, to significantly improve the flexibility and reliability of RLVs during the airdrop process, it is necessary and important to carry out accurate attitude and position control of flight in the presence of airdrop's effect. 4 Current researches related to the airdrop mainly focused on the analysis of airdrop problem, 5 modeling of vehicle dynamics, 6 trajectory planning, 7 control law design, 8 simulation of airdrop process, 9 and so on. Gao et al 5 studied the influence of perturbation on the airdrop system.…”

Neural networks-based robust adaptive flight path tracking control of large transport

“…In addition, on the basis of decoupled and linearized aircraft model achieved by using the input-output feedback linearization approach, an iterative SM(slidingmode) flight controller is presented. This method establishes a global dynamic switching function in the first-level for the sake of eliminating the reaching phase of the sliding motion, meanwhile, a nonlinear function in the second-level is designed to constitute an integral sliding manifold, weakening the overcompensation of the integral term to big errors effectively [9]. Moreover, on the basis of the feedback linearization aircraft-cargo model, a SMC(sliding-mode control) approach has been developed based on a projection adaptive function approximation, in which an adaptation strategy is designed to acquire robustness against the uncertainties of a model, besides, the prior knowledge of the complicated uncertainties is not Engineering Review, Vol.…”

“…Ultra-low-altitude airdrop, mainly used for delivering heavyweight equipment and supplies to the desired region precisely, is one of the essential functions of a large transport aircraft and it is critical to the success of many military tasks [1,2]. The process of ultralow-altitude airdrop includes five stages: preparation, fallin, flat, tracking and pull.. After the stage of falling, heavyweight equipment and supplies are dropped to the desired place accurately.…”

“…Besides, the ground effect [3,4,5], a sensor measurement error and the low altitude airflow and other uncertain factors seriously disturb trajectory control and threaten the flight safety and mission performance [6,7,8].What's more, the aircraft with a low-speed flying state has a poor anti-interference performance, which is highly susceptible to low-altitude atmospheric disturbances. Over the recent years, quite a few meaningful achievements have been reported in developing advanced aircraft controllers to ensure the accuracy and aircraft safety of the airdrop [1,[9][10][11][12][13][14][15][16]. For example, a strong robustness of double ring mixed iterative sliding mode controller is proposed to reject constant uncertainties and uncertain atmospheric disturbance [1].…”

Backstepping control based onL1adaptive theory for large transport aircraft heavy load airdrop

“…6,9 In the study by Jann, 8 the general military airdrop process of longitudinal channel is simulated, with the influence of airdrop on the flight control system studied by Chen et al 6,9 At the moment of cargo separating from aircraft, the large angle of attack motion and the problem from controlling models of security are shown in the literatures. [10][11][12][13] The variable structure control in Xu and Sun 14 and sliding mode control in Zhang and Shi 15 are also studied to ensure the safety of the aircraft.…”