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We describe the modelling and control of a new-kind airship which is propelled by buoyancy. Based on the Newton-Euler equations and Kirchhoff equations, and referred to the models of underwater gliders and aircraft, a 6DOF nonlinear mathematical model of a buoyancy-driven airship is derived, with features distributed internal mass, and no thrust, elevators and rudders. The attitudes are controlled...
This paper presents a suitable scheme for the fault detection and isolation of a high voltage DC electrical network in more electric aircraft. Concerning a more electric aircraft architecture comprising one variable frequency generator, one 18-pulse autotransformer, power electronic converters, high voltage DC transmission lines, electromagnetic actuators and numerous constant electrical loads e.g...
Trajectory-based operations constitute a key mechanism considered by the Joint Planning and Development Office (JPDO) of the U.S. for managing traffic in high-density or highly complex airspace in the Next-Generation Air Transportation System (NextGen). With this concept applied to surface operations at major airports, current research has been exploring the use of surface 4-dimensional (4D) trajectories,...
This paper deals with the problem of modeling and control for the longitudinal motion of an air-breathing hypersonic vehicle (AHV). For a highly nonlinear, dynamically-coupled simulation model of an AHV, the corresponding linearized model is first formulated for the problem of control design. Then, by using a Lyapunov approach, the existence condition for the desired controller is presented for guaranteed...
A small UAV is being developed in the Faculty of Mechanical and Aerospace Enginnering, ITB, Indonesia. The UAV system is designed for surveillance missions in a rural area. The limitation of payload space, weight, and power source demands the system to be designed with limited application of sensors and actuators, while it is still required to be able to perform its mission within a predefined measures...
UAV are becoming increasing interesting for many applications, also in the civil field. While UAV are usually expected to be in constant contact with basis stations, a critic aspect of their usability is related to the autonomy in case of an interruption of communications. This autonomy includes the ability of both a sense-and-avoid algorithm as well as local pilot capabilities. In this paper we present...
Sliding mode controllers are known to be robust to parameter changes and capable of rejecting disturbances. Most sliding mode controllers were implemented on aircraft models that were derived based on the aircraft's body axes. The aircraft model in this paper are derived from an energy based modeling technique where the aircraft dynamics can be defined by Euler-Lagrangian equations that makes decoupling...
This paper proposes a backup attitude estimation scheme for small fixed-wing unmanned aerial vehicles (UAVs) in the event of gyroscopic failure. The attitude of the system is propagated in terms of 3 degrees-of-freedom (DoF) aircraft dynamics while a combined accelerometer and global positioning system (GPS) based attitude measurement scheme is used to update attitude errors. The uncertainties in...
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