Essays about: "rotor dynamics"

Showing result 21 - 25 of 48 essays containing the words rotor dynamics.

  1. 21. Evolution of Cavity Tip Vortices in High-Pressure Turbines

    University essay from Uppsala universitet/Elektricitetslära

    Author : Albin Berglund; [2017]
    Keywords : CFD; turbomachinery; tip gap; fluid dynamics; cavity; rotor blade;

    Abstract : This degree project in applied physics studies the tip gap flows over the rotor blades of a high-pressure turbine. The rotor blade used in the study has an improved design that utilizes both a cavity tip and an uneven profiling to reduce turbine loss. READ MORE

  3. 22. Dynamics and electronics of a manually chargeable quadcopter for steady-state flight

    University essay from Mälardalens högskola/Akademin för innovation, design och teknik

    Author : Ioannis Kantsaporidis; Sadeq Al-Attar; [2017]
    Keywords : Rechargeable quadcopter; back emf; momentum theory; sustainability; battery performance; thrust; power;

    Abstract : The objective of this thesis is to investigate how the onboard battery of a quadcopter can be charged through manual rotation of its motors, while understanding the resulting aerodynamical forces acting on the rotors during hover, as well as considering the changes in thrust capabilities when the electronic and structural design are altered. A theoretical approach using the momentum theory will present a general understanding of rotor performance whilst describing the correlation between rotor parameters, thrust and mechanical power. READ MORE

  4. 23. Aerodynamic performance of a wind-turbine rotor by means of OpenFOAM

    University essay from KTH/Mekanik

    Author : Evangelos Giannopoulos; [2017]
    Keywords : wind turbine; rotor; performance; CFD model; boundary layer; roughness;

    Abstract : In order for wind-farm operators to deal with challenges regarding their fleet management, it is useful for them to estimate their units’ performance for different conditions. To perform such estimations, Computational Fluid Dynamics (CFD) may be used. READ MORE

  5. 24. Identification and Estimation of DC-Motor Dynamics for the Crazyflie Quadcopter

    University essay from Lunds universitet/Institutionen för reglerteknik

    Author : Erik Ottosson; [2017]
    Keywords : Technology and Engineering;

    Abstract : In this thesis methods for finding state space representation parameters for low inductance DC-motors are found and evaluated. Theory previously tested in simulations is verified experimentally and improved upon for both linear behaviour when the motor is controlled with a DC-source as well as nonlinear behaviour when controlled with pulse width modulation (PWM). READ MORE

  6. 25. An Alternative Variable Valve Timing System for Heavy Duty Vehicles

    University essay from Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

    Author : Mikael Eriksson; Daniel Olovsson; [2016]
    Keywords : Variable; Valve Timing; VVT; Cam phaser; Heavy Duty; Scania; Commercial Vehicles; GT-SUITE; Dynamic; On off valve; Product Development; Machine Element;

    Abstract : The ability to control engine valve timing has the potential to alter the engine performance over the entire operating range. The outcome of valve timing technology enables the possibility to increase efficiency, lowering emissions, increase engine torque, etc. One of the simplest ways to obtain a variable valve timing is to use cam phasers. READ MORE