Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"Rotor Design"”.
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Unconventional Swept Rotor Design using Open Vehicle Sketch Pad (OpenVSP)
Rotors are a crucial component of VTOL(vertical take-off and landing) devices like unmanned aerial vehicles (UAVs) or helicopters, etc., By generating a rotational force, they create the necessary thrust to lift and maneuver the vehicle in the air. In recent years, there has been a growing emphasis …
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Laboratory-Scale Analysis of Energy-Efficient Froth Flotation Rotor Design
… of the equipment variables, particularly the rotor design, at the laboratory scale. During this study, several small-scale flotation systems were developed, including various rotor and stator designs, tank sizes, and flow conditions. Experimental techniques were also developed to identify …
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Cogging torque reduction of 6s-4p spoke-type IPMSM using a new combination of rotor design
… thesis exemplifies the significance of various rotor-PM configurations of three-phase 6S-4P Spoke-type (IPMSM). Initially, conventional cogging torque reduction techniques of skewing (Sk), notching (Not), radial pole pairing (Pop), and axial pole pairing (App) were analysed. Then, a new …
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Rotor Wakes; Formations, Interactions, and Design
… investigates the fundamental flow physics of rotor wakes and presents a rotor design methodology that enables the creation of mission-tailored wakes for improved aero-propulsive integration. These goals are addressed through a series of experimental campaigns involving both ducted and unducted …
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Designing the Human-Powered Helicopter: A New Perspective
… theory and analytical methods, a collection of design tools was created to expediently conceptualize and then analyze virtually any rotor. The tools were then arranged as part of a complete helicopter rotor design process. The lessons learned as a result of studying this process—and the tools of …
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Influence of Induced Unbalance on Subsynchronous Vibrations of an Automotive Turbocharger
Rotordynamic instability is present in most or all automotive turbochargers. High subsynchronous amplitudes can cause a variety of problems in areas such as mechanical failures, emissions regulations and rotor design. Self-excited vibrations from sources of damping can lock in at lateral natural …
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Rotordynamic assessment for a permanent magnet synchronous motor
High speed and high rotor tip-speed, in particular, combined with high magnetic and electrical loading, are key enablers for obtaining high specific power in electric machines. The rotor described in this thesis pushes the tip speed to about 80% of the speed of sound. An outer rotor design with a …
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Design of a high torque density modular actuator for dynamic robots
When designing new control systems for dynamic robots, differences between simulated and real-world physics can cause the robot hardware to experience a significant amount of misuse, often leading to downtime as hardware is continuously repaired and improved. The MIT Biomimetic Robotics Lab aimed …
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Design and development of a small-scale 12S-14P outer rotor HEFSM
… on validating a small scale of 12S-14P outer-rotor hybrid excitation flux switching motor (OR-HEFSM) through simulation, experimental, and mathematical modelling. The JMAG-Designer software as finite element solver is used to design and analyse the designed geometry structure. Throughout …
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Investigation of High-Efficiency Radial and Tapered Brushless PM Machines
… To achieve this, both new materials and design modifications should be considered. Brushless permanent magnet (PM) machines are an excellent substitute to replace conventional machines in many applications as they offer higher efficiency, reliability and power density. Therefore, this …
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Distortion Tolerant Fan Design
… is to understand the impact of strengthening rotor blades on aerodynamic performance, investigate how the performance can be improved by modifying the fan rotor radial work profile and explain the mechanism that allows BLI fans to operate stably even when there are regions where the fan …
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Aeroelastic modelling of gyroplane rotors
The gyroplane represents the first successful rotorcraft design and it paved the way for the development of the helicopter during the 1940s. Gyroplane rotors are not powered in flight and work in autorotative regime and hence the characteristics of a helicopter rotor during powered flight and a …
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Design of Large Wind Turbine Rotors Through Passive and Active Load Mitigation Strategies
… to higher wind speeds, and also by increasing rotor diameters which allow for more power capture. However, there are significant challenges that come with these large turbines like aeroelastic instabilities of the blades due to their long and slender nature, and the need for more robust turbine …
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Aerodynamic Enhancement and Reduced Order Modeling of Vertical Axis Wind Turbines
… deflector orientation angle effect on the dual-rotor straight blade vertical-axis wind turbine (DR-SBVAWT) performance is conducted. Two-dimensional transient simulations were performed for this parametric study. The results demonstrate that deflector implementation boosts the DRSBVAWT self …
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Propeller-Driven Rotor Twirl Phenomenon: Hover Performance, Dynamics, and Controls
Propeller-driven rotors use compact electric motors and propellers, mounted on the main rotor blade, to generate the mechanical torque needed to rotate the main rotor. The presented work details experiments and model developments in three major areas: hover performance, dynamics, and controls. The …
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Measurement and Prediction of Rotor Noise Sources for sUAS in Outdoor and Laboratory Environments
… of aerodynamic performance and noise of eVTOL rotors operating in multiple facilities, and analysis of the noise associated with an outrunner brushless DC motor. Empirical and low-order models are used to predict aerodynamic performance, tonal noise, and broadband noise for isolated eVTOL …