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This paper describes a model free method for monitoring and fault diagnosis of the elements in a rotor system for a wind turbine. The diagnosis as well as the monitoring is done without using any model of the wind turbine and the applied controller or a description of the wind profile. The method is based on available standard sensors on wind turbines. The method can be used both on-line as well as...
The study of Unmanned Aerial Vehicles (UAVs) has grown fast recently, and various applications have been developed. This paper presents a design and implementation of attitude control of a co-axial octocopter (CAO). The dynamic model of a CAO is obtained from making the configuration similar to a quadcopter. In order to stabilize the attitude control of CAO, we propose a Fuzzy+PID design of the attitude...
Landing of unmanned helicopters is a challenging maneuver which can be seriously affected by GPS sensor reliability. This work explores an alternative approach to GPS sensors to avoid typical drawbacks, such as inaccuracies of standalone sensors or weight/cost for Real Time Kinematic (RTK) setups. To this end, the paper studies a setup consisting of a tether linking the helicopter to the landing point...
In this paper, we address the attitude and vertical stabilization problem for small-scale helicopters. An emergency controller that would successfully stabilize the helicopter in a safe flight mode when a pilot/autopilot fails to control it, owing to unexpected reasons, is of outmost importance in flight control systems. In this direction, we propose a low complexity nonlinear control scheme that...
A new high-speed and high-precision spindle system test rig has been developed for evaluating the performance of water-lubricated high-speed hybrid bearings. The hybrid bearing is consisted of four stepped recesses and two symmetric circumferential grooves. The orifice compensated hybrid bearings have been successfully used in a high-speed spindle system. The rotating speeds of the spindle system...
Fault detection becomes more complex when nonlinear wind energy conversion systems (WECS) are subjected to parameter uncertainties. The problem of fault detection and isolation (FDI) still remains an active research area. A robust active fault tolerant fuzzy control (RAFTFC) of variable-speed wind energy conversion systems (WECS) in the presence of wide wind variation, wind disturbance, parametric...
We discuss the development of a mini-quadrotor system for indoor application at Konkuk University. The propulsion system consists of X-UFO blade propellers and brushless direct current (DC) motors assembled on a very stiff airframe made of carbon fiber composite material. The attitude control system consists of a stability augmentation system as the inner loop control and a modern control approach...
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