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.
Aircraft loss-of-control (LOC) is the major contributing factor to fatal accidents and is characterised by the manoeuvring of aircraft beyond the allowable flight envelopes. This paper proposes an online learning and inference based method for aircraft flight envelope estimation in order to prevent aircraft LOC. The lift and drag coefficients of the aircraft are identified online using an extended...
Considering the strong uncertainties of aerodynamic parameters and atmospheric environment and the large dynamic variation during the Reusable Launch Vehicle (RLV) reentry process, this paper introduces an attitude controller design method which combines Linear Quadratic Regulator (LQR) with Fuzzy Gain-Scheduling (FGS). The whole operating envelope is divided into several design points firstly. And...
Boundary Layer Ingestion (BLI) effects are the new and special issues caused by the in-depth integration of airframe and propulsion system. Based on a mathematical model of the distributed propulsion system and a sliced CFD model of SAX-40, this paper presents a detailed numerical research on the BLI effects of distributed propulsion configuration. The influence regularities of BLI on aerodynamic...
This paper presents a systematic research on the supercirculation effects of Distributed Propulsion Configuration, based on a mathematical model of the distributed propulsion system and a sliced CFD model of SAX-40. Multiple factors which can affect supercirculation effects such as the deflection angle of thrust, Boundary Layer Ingestion effects, jet flow velocity, Angle of Attack and flight speed...
Structural damage will cause a sudden variation of aircraft's quality, center of gravity and aerodynamic characteristics, as well as the destruction of longitudinal symmetry, thus bringing strong coupling. These pose serious threat to flight security. The present paper studies a kind of damaged aircrafts by presenting the nonlinear 6-DOF model of structural damaged aircraft and analyzing its dynamic...
In this paper, a control method combining Active Disturbance Rejection Control (ADRC) and optimal control is discussed for large aircraft landing attitude control with disturbances, such as turbulence, gusts and modeling errors. On the basis of the extended state observer (ESO) inherited from ADRC, our design exploits the Linear Quadratic Regular (LQR) replacing the original Proportional-Derivation...
Active center of gravity (C.G.) control is a key technology of vehicle management system, which has been extensively used in various types of aircraft. With active C.G. control system, aircraft may deviate from its known dynamics due to the C.G. offset, thus bringing new problems to the existing flight control system. A new design approach of the attitude control system of aircraft with C.G. variations...
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.