Search for dissertations about: "pitch control"

Showing result 1 - 5 of 47 swedish dissertations containing the words pitch control.

2. 1. Control of variable speed wind turbines in a broad range of wind speeds

   Author : Thommy Ekelund; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; LQG; linear quadratic; variable speed; fixed pitch; wind turbine; stall control; Kalman filter;

   Abstract : .... READ MORE

4. 2. Towards Aerial Robotic Workers

   Author : Emil Fresk; Dimos Dimarogonas; Luleå tekniska universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Aerial Robotic Worker; UAV; Multirotor; Quadrotor; Estimation; Quaternion; Inertial Navigation; Reglerteknik; Control Engineering;

   Abstract : The aim of this thesis is to advance the control and estimation schemes for multirotors, and more specifically the Aerial Robotic Worker, in order to progress towards the necessary control and estimation performance for robust control, cooperation and collaboration. Towards this envisioned aim, this Licentiate thesis will present the following main research contributions: a) a singularity-free attitude controller for the attitude problem has been established, that does not have the inherent drawbacks of Euler angle or Direction Cosine Matrix based approaches, b) a generalized estimation scheme for attitude, position and parameter estimation will be presented that has the merit of low computational footprint, while it is robust towards magnetic disturbances and able to identify key parameters in the model of an Aerial Robotic Worker, c) an method for estimating the induced vibration frequencies on the multirotor’s frame, and the respective amplitudes, that relies on notch filtering for attenuating the induced vibrations, and d) a theoretical establishment, as well as an experimental development and evaluation of a variable pitch propeller model to add additional degrees of freedom and increase the robustness of an Aerial Robotic Worker. READ MORE

5. 3. Augmenting L1 Adaptive Control of Piecewise Constant Type to Aerial Vehicles

   Author : Anders Pettersson; Institutionen för reglerteknik; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Abstract : In aerial vehicle control design, the industrial baseline is to use robust control methods together with gain-scheduling to cover the full airspeed and altitude flight envelope. An adaptive controller could possibly add value by increasing performance while keeping robustness to deviation from nominal assumptions. READ MORE

6. 4. Mechanics and acoustics of violin bowing : Freedom, constraints and control in performance

   Author : Erwin Schoonderwaldt; Anders Askenfelt; Knut Guettler; Jim Woodhouse; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; HUMANIORA; HUMANITIES; bow-string interaction; bowed string; violin playing; motion capture; bowing parameters; performance control; Other physics; Övrig fysik; Music; Musikvetenskap;

   Abstract : This thesis addresses sound production in bowed-string instruments from two perspectives: the physics of the bowed string, and bow control in performance. Violin performance is characterized by an intimate connection between the player and the instrument, allowing for a continuous control of the sound via the main bowing parameters (bow velocity, bow force and bow-bridge distance), but imposing constraints as well. READ MORE

7. 5. Interactions between non-polar surfaces in water: Fokus on talc, pitch and surface roughness effects

   Author : Viveca Wallqvist; Per Claesson; Janne Laine; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Talc; surface forces; capillary attraction; hydrophobic interaction; pitch control; wetting agent; dispersing agent; adsorption; imbibition; absorption; permeation; atomic force microscopy; colloidal probe; Hamaker constant; surface roughness; nanostructure.; Talk; kapillärattraktion; ytkrafter; hydrofob växelverkan; hartskontroll; vätningsmedel; dispergeringsmedel; adsorption; uppsugning; absorption; permeabilitet; atomkraftsmikroskopi; kolloidal partikel; Hamakerkonstant; ytråhet; nanostrukturerad yta.; Surface and colloid chemistry; Yt- och kolloidkemi; Physical chemistry; Fysikalisk kemi; Chemistry; Kemi;

   Abstract : The aim of this thesis work was to gain understanding of the interactions between talc mineral and surfaces, liquids and chemicals relevant for industrial applications, such as pulp and paper. Talc is used in the pulp and paper industry as a filler pigment, in control of pitch (lipophilic extractives) deposits and as a coating pigment. READ MORE