The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The effect of the irregular air-water interface on the performance of the down-link quantum key distribution from the air to the sea is studied. Based on the analysis of the relationship between the incident angle and the quantum bit error rate, the air-water interface model with wind speed is adopted, the influence of the wind speed on the incident angle of the photon is discussed, the relationship...
This paper investigates the dynamic surface control of nonlinear transport aircraft model during the process of continuous heavy cargo airdrop in case of disturbance and actuator saturation. For the continuous airdrop process, the effects of moving process parameters include cargo mass and moving items upon the flight and the aircraft dynamics is with dramatic change. The dynamic surface related technique...
Comprehensive study on control stability analysis before controller design is an indispensable important step for any flight system. In this paper, frequency modal responses and relative input-output controllability are analyzed quantitatively to provide valid instruction for structure improvement. In this project, tilting electric ducted fan (EDF) system is devised for an unmanned tandem ducted fan...
Force and torque generation mechanisms for an unconventional tandem ducted fan aircraft are investigated. Numerical techniques are implemented to obtain quasi-steady thrust, numerical integration of nonlinear equations of motion and trim iteration process, respectively. The comprehensive nonlinear model is derived and simplified to linear approximations at different flight conditions for stability...
Recently numerous controller designs have been developed for the longitudinal dynamics of hypersonic flight vehicle in cruising phase. Among these methods, back-stepping is widely studied since it provide the systematic design dealing with mismatched uncertainty. This paper first presents the nonlinear formulation for the dynamics and then the recent back-stepping related design is reviewed such as...
This paper describes the design of adaptive neural controller for the longitudinal dynamics of a generic hypersonic flight vehicle (HFV). For the altitude subsystem, the dynamics are transformed into the normal feedback form and the high gain observer (HGO) is taken to estimate the unknown newly defined states. Only one Neural Network (NN) is employed to approximate the lumped uncertain system nonlinearity...
This paper investigates the adaptive Kriging controller for the longitudinal dynamics of a generic hypersonic flight vehicle (HFV). For the altitude subsystem, the dynamics are transformed into the strict-feedback form where the back-stepping scheme is employed. Considering the nonlinearity of the dynamics, the nominal feedback is included in the controller while Kriging system is designed to estimate...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.