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The design of a robust longitudinal flight controller for the air-breathing hypersonic vehicle is presented in this paper. The non-standard dynamic characteristics of air-breathing hypesonic flight vehicles together with the aerodynamic effects of hypersonic flight make the flight control of such systems highly challenging. Moreover the wide range of speed during operation and the lack of a broad...
The design of a robust gain scheduling controller which is scheduled on Mach number and altitude for the air-breathing hypersonic vehicle (AHV) is presented. In order to capture the nonlinear airspeed and altitude dependence of AHV, a linear parameter varying (LPV) model is constructed from a set of linearization of the AHV longitudinal dynamics. The linear fractional transformation (LFT) representation...
This paper presents an electrically powered micro air vehicle (MAV) with a flexible wing integrated with on-board electronic components that is built at Tsinghua University. The low aspect ratio wing, adopting the airfoil of S5010 and Zimmerman shape, is made up of a flexible printed circuit membrane (FPCM) that covers a thin carbon fiber skeleton. The real MAV prototype is tested in a low-speed wind...
This paper presents a robust fixed order H2 controller designed using Strengthened discrete optimal projection equations (SDOPEs), which approximate the first order necessary optimality condition. The novelty of this work is the application of the robust H2 controller to a micro aerial vehicle MAV, named Sarika2 developed in house. The controller is designed in discrete domain for the longitudinal...
The objective of this paper is to accomplish the modeling and coupling effect analysis of a high-speed aircraft. A 2D model of the high-speed aircraft is assumed. The description of the aerodynamic characteristics including forces and moments system models is included in this paper. The analysis and policies of decoupling are put forward based on the data of the high-speed aircraft. Results show that...
In order to locate the known landing area from far distance in image captured by on-board camera roughly, the method of known landing area rough locating from far distance by matching of the real-time images with the reference image is proposed. As meanwhile, a novel image matching algorithm named DDM-SIFT (double directions matching of SIFT) is presented, and rough location estimation is achieved...
This paper describes the vertical-flight mode of a novel unmanned air vehicle configuration designed to perform either vertical or forward flight. We present the mathematical model of the aircraft's attitude in vertical mode which is derived via the Euler-Lagrange formulation, followed by the control strategy, based on saturations. The control strategy is simple for embedded applications and it showed...
In this paper, we present the design of an autopilot embedded control system for VTOL aircrafts using low cost sensors. The embedded control system uses parallel processing architecture. In addition, multitasking software is used to implement the data acquisition, control law computation, and correction output to get the desired set point. The control law can be easily tuning to improve the performance...
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