A5069303057- Wave and Wind Energy Systems
- earthquake and tectonic studies
- Wind Energy Research and Development
- Geological and Geochemical Analysis
- Offshore Engineering and Technologies
- Underwater Acoustics Research
- Marine animal studies overview
- Marine and Offshore Engineering Studies
- Fluid Dynamics and Vibration Analysis
- Seismology and Earthquake Studies
- Geological and Geophysical Studies
- Methane Hydrates and Related Phenomena
- Seismic Imaging and Inversion Techniques
- Seismic Waves and Analysis
- Animal Vocal Communication and Behavior
- Coastal and Marine Dynamics
- Hydrogen embrittlement and corrosion behaviors in metals
- Structural Integrity and Reliability Analysis
- Geological and Tectonic Studies in Latin America
- Non-Destructive Testing Techniques
- High-pressure geophysics and materials
- Geological Studies and Exploration
- Wind and Air Flow Studies
- Wind Turbine Control Systems
- Astro and Planetary Science
Liquids Research (United Kingdom)
2024
University of Maine
2013-2023
Oregon State University
2003-2015
Oregon Department of Fish and Wildlife
2003-2015
NOAA Pacific Marine Environmental Laboratory
2006-2013
National Oceanic and Atmospheric Administration
2002-2013
North Carolina State University
2013
Korea Polar Research Institute
2013
Oceanography Society
2013
In February 1999, long‐term hydroacoustic monitoring of the northern Mid‐Atlantic Ridge (MAR) was initiated. Six autonomous hydrophones were moored between ∼15°N and ∼35°N on flanks MAR. Results from first year data reveal that there is significant variability in along‐axis event rate. Groups neighboring segments behave similarly, producing an pattern with high low levels seismic activity at a wavelength ∼500 km. This broad scale likely influenced by axial thermal regime. Several earthquake...
In 2011, the DeepCwind Consortium performed 1/50th-scale model tests on three offshore floating wind platforms at Maritime Research Institute Netherlands (MARIN) using a geometrically scaled of National Renewable Energy Laboratory (NREL) 5 MW reference turbine. However, due to severe mismatch in Reynolds number between full scale and scale, strictly Froude-scaled, geometrically-similar (geo-sim) turbine underperformed greatly, which required significant modification test speeds match key...
To enable the fast growth of floating offshore wind industry, simulation models must be validated with experimental data. Floating model-scale experiments in wind–wave facilities have been performed over last two decades varying levels fidelity and limitations. However, turbine controls these considered only limited control strategies implementations. allow for co-design, this research focuses on implementing experimentally validating more advanced actions a basin 1:70-scale model...
In 2011 the DeepCwind Consortium, led by University of Maine (UMaine), performed an extensive series floating wind turbine model tests at Maritime Research Institute Netherlands (MARIN) offshore basin. These tests, which were conducted 1/50th scale, investigated response three concepts subjected to simultaneous and wave environments. The blades utilized for geometrically-similar models those found on National Renewable Energy Laboratory (NREL) 5 MW reference poorly in Froude-scaled,...
Model basin testing is a standard practice in the design process for offshore floating structures and has recently been applied to wind turbines. 1/50th scale model tests performed by DeepCwind Consortium at Maritime Research Institute Netherlands (MARIN) 2011 on various platform types were able capture global dynamic behavior of commercial turbine systems; however, due severe mismatch Reynolds number between full scale, strictly Froude-scaled, geometrically similar underperformed greatly....
Research Article| July 01, 2007 Rapid dike emplacement leads to eruptions and hydrothermal plume release during seafloor spreading events R.P. Dziak; Dziak 1Cooperative Institute for Marine Resource Studies, Oregon State University, Pacific Environmental Laboratory, National Oceanic Atmospheric Administration (NOAA), Hatfield Science Center, Newport, 97365, USA Search other works by this author on: GSW Google Scholar D.R Bohnenstiehl; Bohnenstiehl 2Department of Marine, Earth Sciences, North...
An array of autonomous underwater hydrophones is used to investigate regional seismicity associated with the 22 January 2006 seafloor‐spreading event on northern East Pacific Rise near 9°50′N. Significant earthquake activity was observed beginning 3 weeks prior eruption, where a total 255 earthquakes were detected within vicinity 9°50′N area. This followed by series 252 events and rapid decline background levels during subsequent days. Because their small magnitudes, accurate locations could...
Vertical axis wind turbines are receiving significant attention for offshore siting. In general, offers proximity to large populations centers, a vast & more consistent resource, and scale-up opportunity, name few beneficial characteristics. On the other hand, suffers from high levelized cost of energy (LCOE) in particular balance system (BoS) costs owing accessibility challenges limited project experience. To address these associated with wind, Sandia National Laboratories is researching...
Abstract This paper summarizes the scaling approach and results from first experimental campaign of Floating Offshore-wind Controls Advanced Laboratory (FOCAL) Experimental Program, which is focused on developing public data sets to support validation numerical models for floating wind control co-design. A 1:70 Froude-scale performance-matched model IEA Wind 15-MW reference turbine was designed, built, characterized a fixed base. The National Renewable Energy Laboratory’s Reference...
Abstract As part of the process deploying new floating offshore wind turbines, scale model testing is carried out to de-risk and verify design novel foundation concepts. This paper describes a 1:43 Froude-scaled TetraSpar Demo turbine prototype that shall be installed at Metcentre test facility, Norway. The concept consists floater tetrahedral structure comprising braces connected together through pinned connections, triangular keel suspended below by six suspension lines. A description...
The seismicity of the North Atlantic was monitored from May 2002 to September 2003 by ‘SIRENA array’ autonomous hydrophones. hydroacoustic signals provide a unique data set documenting numerous low‐magnitude earthquakes along section Mid‐Atlantic Ridge (MAR) located in ridge‐hot spot interaction context. During experiment, 1696 events were detected MAR axis between 40°N and 51°N, with magnitude completeness level m b ≈ 2.4. Inside array, location errors are order 2 km, origin time less than...
Experimental results from the Floating Offshore-wind and Controls Advanced Laboratory (FOCAL) experimental program, which tested a performance-matched model of IEA Wind 15 MW Reference Turbine on 1:70 scale floating semisubmersible platform, are compared with OpenFAST simulations. Four campaigns were performed, data fourth campaign, focused wind wave testing scaled turbine system, considered. Simulations wave-only, wind-only, wind/wave environments performed in OpenFAST, for key metrics...
Abstract Floating offshore wind turbine designs can be further optimized if the controller and remaining systems are designed together, known as control co-design. To effectively perform co-design, modeling tools predicting influence of on response a system must validated. This article presents an experimental validation that utilizes scale model semisubmersible platform for is fitted with adjustable tuned mass dampers. These dampers to attenuate either hull-pitch resonance or tower-bending...
When considering the future of offshore wind energy, developing cost effective methods harnessing resource represents a significant challenge which must be overcome to make viable option. As majority capital investment in is form infrastructure and operation maintenance costs, reducing these expenditures could greatly reduce energy (COE) for an project. Sandia National Laboratory its partners (TU Delft, University Maine, Iowa State, TPI Composites) believe that vertical axis turbines (VAWTs)...
Development is under way of a new intelligent autonomous hydrophone system, the Quasi-Eulerian hydrophone, or QUEphone. A tether-free portable float with built-in data processor, it capable repeated vertical ascents and descents from seabed to surface using an internal buoyancy controller. While on seafloor, runs acoustic event detection algorithm continuously; upon significant event, at regular intervals, surfaces transmit its position small file shore via satellite. Issues detecting events...
Abstract Increased interest in floating offshore wind turbine (FOWT) technology has stimulated the development of new testing facilities and techniques to support design these structures. This paper presents some specific challenges FOWTs how requirements have driven wind/wave basins capable providing both high quality wave environments necessary test Previous experience by University Maine (UMaine) others as part DeepCwind Consortium 1/50th-scale at Maritime Research Institute Netherlands...
A variable-scale model wind turbine has been developed by the Advanced Structures and Composites Center for testing scale-model floating offshore turbines. This designed to be lightweight with a robust individual blade pitch mechanism. Froude number similitude is used develop scaling relationships, while specialized blades have produce representative aerodynamic forces despite mismatched Reynolds numbers. Numerical simulations show that able match scaled thrust of commercial turbines...
Over the past 6 years, University of Maine (UMaine) has been an active contributor in research and scale-model testing floating offshore wind turbines (FOWTs). This paper serves to share evolution UMaine’s pedigree by exploring various test campaigns at a high level, culminating with design validation VolturnUS platform. These model have each provided key insights into behavior FOWT platforms as well improving ability perform tests FOWTs. In 2011, UMaine-led DeepCwind Consortium carried out...