113 research outputs found
Artificial Potential Field and Sliding Mode Strategies for Rendezvous Maneuver and Obstacle Avoidance
No full textStrategies for Control, Fault Detection and Isolation Via Sliding Mode Techniques for a 3-DOF Helicopter
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Obstacle Avoidance with Potential Field Applied to a Rendezvous Maneuver
No full textThis paper outlines a method based on the theory of artificial potential fields combined with sliding mode techniques for spacecraft maneuvers in the presence of obstacles. Guidance and control algorithms are validated with a six degree-of-freed (dof) omorbital simulator. The idea of this paper is to provide computationally efficient algorithms for real time applications, in which the combination of Artificial potential field (APF) and sliding mode control shows the ability of plan trajectories, even in the presence of external disturbances and model uncertainties. A reduced frequency of the proposed controllers and a pulse width modulation (PWM) of the thrusters are considered to verify the performance of the system. The computational performance of APF as a guidance algorithm is discussed and the algorithms are verified by simulations of a complete rendezvous maneuver. The proposed algorithm appears suitable for the autonomous, real-time control of complex maneuvers with a minimum on-board computational effort
Minimax Optimization of Fatigue Loads in a Wind Farm and its Realization Via Sliding Mode Controller of Wind Turbines
No full textWind Turbine Sliding Mode Control and Wind Farm Energy Optimization with Fatigue Constraints
No full textNanostructured Silicon for High-Efficient and Cost-Effective Heat Recovery Through Thermoelectric Conversion
No full textNanostructuring is very effective in enhancing the thermal to electrical energy conversion efficiency of most materials, including in particular silicon which presents a perfect tradeoff between technical potentialities and environmental/political/social issues. Heat sources, that nowadays are exploited only in a small fraction, could become key players in energy production thanks to thermoelectric device based on nanostructured silicon. Successful strategies, including on-chip devices for micro-harvesting and cost-effective large-area vertical nanowire forests for macro-harvesting will be presented. An estimation of the efficiency will be reported, highlighting the competitiveness of these devices with respect to conventional techniques
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