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.
Micro Aerial Vehicles(MAVs) have been seen rapid progress in the indoor entertaining, security monitoring, as well as search and rescue activities. Localization capability is one of the basis of MAVs autonomous movement and path planning. This paper proposes a novel indoor localization algorithm using a prior map for the mini MAVs with a sparse sonar array. Four mutually perpendicular installed ultrasonic...
The noteworthy feature of aircraft with distribute propulsion configuration is the integration of the fuselage and semi-embedded distributed propulsion system, which brings strong coupling effects between flight and propulsion systems. The aim of this article is to systematically investigate the coupling effects due to boundary layer ingestion under different flight states. As the basis, the definition...
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...
Structural damage may weaken the aircraft and lead to loss of control, which is the leading cause of aircraft fatal accidents in the world. Meanwhile, advanced configuration aircraft is more complex than traditional aircraft and the controlling is more difficult. Hence, based on the modeling of structural damaged aircraft, firstly, the aerodynamic characteristics are analyzed according to trim, linearization,...
Large scale variations in the mass or center of gravity (C.G.) pose serious problems for the control of aircraft in situations as heavy load airdrop on cargo aircraft, the airliners which employ the active C.G. control technology, aircraft with structural damages during the flight. To solve the problem of attitude control of such aircraft, a general model for the aircraft is established and a disturbance...
The non-standard dynamics characteristics of hypersonic vehicles, the aerodynamic effects together with the wide range of speed and altitude during operation make modeling and control of these vehicles highly challenging. Modeling and analysis of hypersonic vehicles are important for control and navigation system design. A six degrees of freedom simulation model of the wing cone generic hypersonic...
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.