Design, Control, and Acoustics of a Marine Hydrokinetic Cycloturbine Vehicle
- Author
- Goldschmidt, Margalit Zipora
- Published
- [University Park, Pennsylvania] : Pennsylvania State University, 2020.
- Physical Description
- 1 electronic document
- Additional Creators
- Horn, Joseph Francis
Access Online
- etda.libraries.psu.edu , Connect to this object online.
- Graduate Program
- Restrictions on Access
- Open Access.
- Summary
- A marine hydrokinetic (MHK) cycloturbine is a renewable electric power generation system used in rivers or tidal environments to address the need for electricity in remote regions. MHK cycloturbines have foils oriented perpendicular to the flow in a paddlewheel configuration. Lift from these foils produces torque to turn the turbine and a generator which in turn produces power. Due to the high cost associated with MHK system operation and maintenance, design of a novel MHK vehicle that can self-deploy and maneuver is a critical objective. By powering the turbines and using pitching foils for control, a maneuverable system can be designed. Initial feasibility studies demonstrate that a four turbine design with stacked counter-rotating turbines provides the best vehicle control and performance. A detailed simulation model is developed to understand the vehicle dynamics and assist in the design of controllers. The simulation model solves the six degree-of-freedom rigid body equations of motion for the MHK vehicle subject to hydrodynamic lift and drag forces, hydrostatic forces, and the propulsive forces from the turbines. The turbine propulsive force model is matched to computational fluid dynamics analysis and experimental data for a 1/5.56 scale single turbine Rapid Prototype Device and a Subscale Demonstrator. Global feedback controllers are initially designed by applying classical control methods to an approximate linear model of the system dynamics. More sophisticated controllers that take into account system nonlinearities are subsequently designed to increase vehicle maneuverability and performance using nonlinear dynamic inversion. In addition to control of the vehicle dynamics, acoustic control is also desired. The cycloturbines are sources of radiated acoustics underwater. Acoustic control is important to curtail the vehicle's vibrations, which reduces the vehicle's fatigue for longer deployment, as well as the acoustic signature, which potentially prevents harmful effects on aquatic life. A method of reducing the radiated acoustics of the vehicle is determined for tones at blade rate frequency and multiples, by means of clocking the blades between turbines. This work is validated experimentally on a Subscale Demonstrator in a reverberant tank.
- Other Subject(s)
- Genre(s)
- Dissertation Note
- Ph.D. Pennsylvania State University 2020.
- Technical Details
- The full text of the dissertation is available as an Adobe Acrobat .pdf file ; Adobe Acrobat Reader required to view the file.
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