Fossum, Peter Kalsaas

Aeroelastic design and fatigue analysis of large utility-scale wind turbine blades are performed. The applied fatigue model is based on established methods and is incorporated in an iterative numerical design tool for realistic wind turbine blades. All aerodynamic and structural design properties are available in literature. The software tool FAST is used for advanced aero-servo-elastic load calculations and stress-histories are calculated with elementary beam theory.According to wind energy des...

Henry, Alexandre

No description available.

Moragues Pons, Jeremias

Offshore wind power has become a growing interest in the worldwide society. New research and investigation in this kind of technology is increasing year after year. Thus, the inspection on the offshore wind turbines is expensive but necessary.The goal of this project is to demonstrate the efficiency of a Remote Inspection System inside the nacelle of an Offshore Wind Turbine. The way of carrying out inspections on real nacelles, as well as other aspects from maintenance is discussed. Three diffe...

Mogstad, Anne Berit

Offshore wind power has an increasing interest in the research community and among the politicians. Therefore it is important to find the right solutions to meet the environmental and commercial requirements to give offshore wind power a promising future. This thesis are proposing a new converter topology for offshore wind parks. Since the topology is based on DC transmission in stead of AC transmission it is better suited for use in this type of parks. All the converters are located in the wind...

Høvik, Kristin Malene

This thesis work shows implementation and testing of existing control strategies in a novel offshore passive platform configuration. Control of the platform voltage and frequency is done through control of a shore-based B2B-VSC configuration, when the frequency on shore differs from the frequency on the platform. An 80 km HVAC-cable and transformers separates the shore-based B2B-VSCs from the platform installation. The system is modeled and simulated in MATLAB® Simulink™ SimPowerSystem...

Crozier, Aina

This thesis presents two designs of tension-leg-platforms (TLP) support structures for the 10 MW reference wind turbine being developed by the Norwegian Research Centre for Offshore Wind Technology (NOWITECH). The designs result from iterative design processes which account for important design considerations such as performance requirements, natural frequencies and main cost drivers, and differ in their capability of providing stability to the wind turbine. TLP Towed is stable during towing and...

Richards, Laurie

The Bay Marchand field is located about 60 miles south of New Orleans, Louisiana on the continental shelf. The structurally complex field has produced over 960 MMBOE as of 2012 (http://www.eplweb.com), with many of these hydrocarbons being trapped against the massive salt dome and associated faulting present in the area. A study by Bruno and Hanor (2003) documented the presence of a high salinity plume off the southeast flank of the dome that had less saline and less dense pore water below it. T...

Lazaridis, Lazaros

An economic comparison of several HVAC-HVDC transmission systems from large offshore windfarms is presented. The power output from the offshore windfarm is modeled by an aggregated power curve. The transmission cost for several transmission systems is calculated for a wide range of windfarm�s rated powers, transmission distances and average wind speeds. Energy losses, energy availability and investment costs constitute the input parameters to the study. For the calculation of the energy availabi...

Planning for offshore hydrocarbon development in Canada’s Beaufort Sea currently occurs on a project-by-project basis. This is despite a collective understanding that impact assessment should go beyond the evaluation of site-specific project impacts to consider the broader policy and regional planning context in which development projects operate. The need for such a regional and strategic approach to impact assessment in Canada’s Beaufort Sea, known as regional strategic environmental assessm...

Chen, Jieyan

The increased interest in the offshore wind resource in both industry and academic and the extension of the wind field where offshore wind turbine can be deployed has stimulated quite a number of offshore wind turbines concepts. This thesis presents a design of mono-column platform supported for 5 MW baseline wind turbine developed by the National Renewable Energy Laboratory (NREL), with a single tether anchored to the seabed. The design, based on the pioneer concept SWAY, results from parametri...

Casey, Michael Chase

This thesis integrated geology, geophysics, and petroleum engineering data to build a detailed reservoir characterization models for three gas pay sands in the Grand Isle 33 & 43 fields, offshore Louisiana. The reservoirs are Late Miocene in age and include the upper (PM), middle (QH), and lower (RD) sands. The reservoir models address the stratigraphy of the upper (PM) sand and help delineate the lower (RD) reservoir. In addition, this research addresses the partially depleted QH-2 reservoir co...

Wang, Lei

Environmental, aesthetic and political pressures continue to push for siting off-shore wind turbines beyond sight of land, where waters tend to be deeper, and use of floating structures is likely to be considered. Savings could potentially be realized by reducing hull size, which would allow more compliance with the wind thrust force in the pitch direction. On the other hand, these structures with large-amplitude motions will make dynamic analysis both more challenging and more critical. Prior t...

Ritchie, Anna E

Thesis (M.S.)--University of Hawaii at Manoa, 2008. / Includes bibliographical references (leaves 56-64). / ix, 64 leaves, bound 29 cm

Garces Ruiz, Alejandro

OFFSHORE wind farms need to develop technologies that fulfill three main objectives:Efficiency, power density and reliability. The purpose of this thesisis to study an HVDC transmission system based on series connection of the turbineswhich theoretically meet these three objectives. A new topology of matrixconverter operated at high frequency is proposed. This converter is studied usingdifferent modulation algorithms. Simulation and experimental results demonstratedthat the converter can be oper...

Chui, Wai-hong., 徐偉康.

published_or_final_version / Applied Geosciences / Master / Master of Science

Tsang, Kwong-ping, Loretta., 曾廣萍.

published_or_final_version / Business Administration / Master / Master of Business Administration

Barnes, Philip M.

In the northern region of South Island, New Zealand, a major tectonic transition occurs in the obliquely convergent Australia-Pacific plate boundary. The southern end of the Hikurangi subduction zone terminates against the Chatham Rise, a submerged continental plateau on the Pacific Plate, which is too buoyant to be subducted. Relative plate motion that is accommodated along the Hikurangi margin is transferred by a complex arrangement of faults, to a zone of transpressive, continental collision ...

Borràs Morales, Jan

Losses for wake effects in offshore wind farms represent about 10% to 20% of the park annual energy production. Several analytical wake models have been developed and implemented to predict the power deficit of a wake-affected wind turbine. Validating and parameterizing the wake models available in the industry is essential to better predict the wake losses and thus maximize the energy yield of future offshore developments. In this study, a wake model validation is undertaken for the three model...

Gehrmann, Romina

This thesis examines the sensitivity of the marine controlled source electromagnetic (CSEM) method to sub-seafloor resistivity structure, with a focus on gas hydrate and free gas occurrences. Different analysis techniques are applied with progressive sophistication to a series of studies based on simulated and measured data sets. CSEM data are modelled in time domain for one-dimensional models with gas hydrate, free gas and/or permafrost occurrences. Linearized and non-linear inversion methods...

Scholz, Nastasja Anais

This dissertation investigates the nature of submarine landslides along the deformation front of the northern Cascadia subduction zone. As the first slope stability analysis on the west coast of Vancouver Island, this study covers a variety of large-scale tectonic to small-scale, site-specific factors to investigate the nature of slope failure. Slope failure occurred mainly on the steep slopes of frontal ridges that were formed by compressive forces due to the subduction of the Juan de Fuca plat...

Brillon, Camille

This study applies Bayesian inversion to receiver functions (RF) to estimate local shear wave velocity (Vs) structure of the crust and upper mantle beneath two ocean bottom seismometers (OBS) offshore, and two land-based seismometers onshore Vancouver Island, British Columbia, Canada. We use passive seismic data recorded on NC89, a permanent NEPTUNE (North-east Pacific Time-series Undersea Networked Experiments) OBS located on the continental slope, and on a temporary autonomous KECK foundatio...

Zykov, Mikhail Mikhailovich

This dissertation presents results from a complex seismic study using Ocean Bot¬tom Seismometers (OBS) conducted at a site of deep sea gas hydrate occurrence. The site is located on the accretionary margin of the northern Cascadia subduction zone offshore Vancouver Island. Canada. The major objectives for this study were the construction of a 3-D velocity model around the Bullseye vent zone by the means of travel time inversion tomography and the analysis of the amplitude data for reflections f...

Graham, Emily Megan

Hydrate Ridge is a peanut shape bathymetric high located about 80 km west of Newport, Oregon on the Pacific continental margin, within the Cascadia subduction zone’s accretionary wedge. The ridge's two topographic highs (S. and N. Hydrate Ridge) are characterized by gas vents and seeps that were observed with previous ODP initiatives. In 2008, we acquired a 3D seismic reflection data set using the P-Cable acquisition system to characterize the subsurface fluid migration pathways that feed the...

Davila-Chacon, Anmar Carolina

The study area is situated along the obliquely converging boundary of the Caribbean and South American plates offshore eastern offshore Trinidad. Major structural elements in the shelf break and deep-water slope regions include normal and counter-normal faults to the south and large transpressional fault zones to the north. Well logs and biostratigraphic information were analyzed for twenty-four wells in the study area to refine previous depositional environment interpretations. For purposes o...

Boquist, Pär

Forecasting capital expenditures in early stages of an offshore wind power project is aproblematic process. The process can be affected by optimism bias and strategicmisrepresentation which may result in cost overruns. This thesis is a response to issuesregarding cost overruns in offshore wind power projects. The aim of this thesis is tocreate a cost forecasting method which can estimate the necessary capital budget in awind power project. The author presents a two-step model which both applies ...

Magnusson, Sebastian, Källgren, Jimmy, Viberg, Tom

The purpose of this thesis is to conduct an international market selection which will result in a suitable choice of market for an SME that is about to place offshore production in an emerging market. A focus during the thesis is directed towards potential risks that may occur and how SMEs can manage these. In order to fulfill this purpose the authors have developed two main research questions:How can an SME use the IMS-framework to select an emerging market for offshore production?How can an SM...

Strub, Christopher M

Approved for public release; distribution is unlimited / In light of recent drastic changes in national security concerns, new systems are being considered for future military implementation. One of the major systems under consideration by the Advanced Research Projects Agency is the Mobile Offshore Base (MOB). The MOB entails essentially two to six self- propelled, floating platforms that are connected and used for military presence and/or war-fighting purposes. This thesis examines the questio...

Umofia, Anietie Nnana

Offshore oil and gas exploitation is principally conducted using dry or wet tree systems, otherwise called the subsea Xmas tree system. Due to the shift to deeper waters, subsea production system (SPS) has come to be a preferred technology with attendant economic benefits. At the centre of the SPS is the subsea control module (SCM), responsible for the proper functioning and monitoring of the entire system. With increasing search for hydrocarbons in deep and ultra-deepwaters, the SCM system face...

Swanson, Ellen, Thorsson, Marie

This thesis aims to describe and analyse how companies establish and maintain relationship quality when outsourcing offshore. In literature we have identified that companies who outsource offshore encounter difficulties with quality and costs. However most of the contracts are renewed even though they encounter these issues. The reason is because relationships are valued higher. In order to create a long-term successful offshore outsourcing, it is of essence for companies to have guidance in how...

Prada Gil, Mikel de

Offshore wind is an emerging energy sector with a huge potential to be tapped in the near future. Offshore Wind Power Plants (OWPPs) are becoming increasingly relevant in Europe and worldwide mainly because the wind speeds are potentially higher and smoother than their onshore counterpart, which leads to higher wind power generation. Moreover, OWPPs have less space limitations constraints, so that it allows the possibility of using larger wind turbines. Nowadays, environmental and social aspects...

Pérez Torres, Asvin

- Introducció: Entendre l'evolució, la distribució i l'ecologia dels animals marins requereix informació prèvia sobre la biologia reproductiva i els patrons de desenvolupament, ja que els estadis primerencs de vida (larves), constitueixen en molts taxons períodes crítics del cicle vital, en els quals l’abundància i la distribució de les poblacions queda en gran mesura determinada. Atesa la importància dels crustacis decàpodes en els ecosistemes marins i les pesqueries de la Mediterrània, i la p...

Stephens, Jason Henry

High-resolution (20-250 Hz) multichannel seismic (MCS) reflection data with record lengths of 4-8 s TWT, totaling approximately 4620 line km on the shelf and slope of the Sandino forearc basin of offshore western Nicaragua, were acquired in November-December 2004 (cruise EW04-12) and subsequently processed at the University of Texas Institute for Geophysics. Seismic sequence interpretation was conducted using these MCS data in conjunction with deeper penetration (16-20. s TWT) MCS profiles from...

Wiegand, Sandra Milena

Decommissioning and abandonment is a relevant issue in the petroleum industry because of the complex operations involved and the results after the decision has been made. Several factors could lead to abandoning wells and decommissioning platforms, among others hurricanes, production decline, economic limit, etc. Decommissioning and abandonment operations have a great impact in the revenue stream which is either lost or temporarily deferred depending on the situation. Every year between 100-150 ...

Catto, Antonio José

The presence of gas and oil in some sand formations decreases the seismic velocity and density to such an extent that anomalously large reflections coefficients are encountered at fluid contacts. Geerstma and Gassmann's theories are equivalent and provide a good way to study the physical properties that affect the elastic behavior of the porous rock. The fluid-contact reflectivity (gas-water, oil-water) can be well estimated based on the brine saturated velocity alone. A comparison between the e...

Soni, Mohit

Wind energy, the fastest growing source of renewable energy, is a promising resource for power generation. Offshore wind energy, in particular,offers favorable conditions for power generation—high winds with low turbulence, minimal visual impacts and high generation capacities. Offshore wind turbines mounted on floating platforms are the most economical and viable solution for deep water sites. A semi-submersible platform is an appropriate floating platform for a deep water site, providing stabi...

Dongsheng, Han, rising_sun_han@hotmail.com

This thesis is concerned with robust control of an offshore steel jacket platform subject to nonlinear wave-induced forces. Since time delay and uncertainty are inevitably encountered for an offshore structure and their existence may induce instability, oscillation and poor performance, it is very significant to study on how the delay and uncertainty affect the offshore structure. In this thesis, a memory robust control strategy is, for the first time, proposed to reduce the internal oscillation...

Alam, Muhammad Shafiqul

[Truncated abstract] The hydrodynamic forces on a marine pipeline and the local scour around it are the most serious and important issues in designing and maintaining pipelines. This thesis explores the vortex shedding phenomena for the flow over smooth surface and rough surface isolated cylinders. This thesis also explores the two-dimensional and three-dimensional scour process beneath offshore pipelines numerically. A series of numerical models are proposed in this dissertation for the predict...

Zaghloul, Hassan

[Truncated abstract] The Arabian Gulf oil and gas production reserves have made it one of the world's strategic producers since early 1960s, with many of the existing platforms stretched beyond their original design life. Advances in drilling technology and reservoir assessments have extended the requirement for the service life of those existing platforms even further. Extension of the life span of an existing platform requires satisfactory reassessment of its various structural components, inc...

Li, Jianyao

Offshore programs have become increasingly popular in countries that are experiencing rapid economic growth and rising demand for higher education. There is no doubt that China is one of the largest markets for offshore programs. However, the offshore program market in China has become increasingly competitive. Currently, institutions from the USA, the UK, and Australia, to name just a few, are offering offshore programs ranging from the professional diploma level to higher degrees such as MA, M...

Mieldazys, Judita. A., Judita.mieldazys@dpcd.vic.gov.au

The interplay of forces behind globalisation, promoting trade and prosperity, and the desire for offshore trade are not fully understood. This is further complicated by the role of the political economy, global sovereignty versus national boundaries, economic status of a country and community needs. The literature found that 'one size does not fit all'. Globalisation results in the consideration of global similarities such as standards, harmonisation of laws, international codes and the growt...

Karen Jane Manley

This thesis focuses on the factors which lead to off-shore manufacture of Australian inventions. It establishes this phenomenon as a problem, both in terms of its incidence in the post-war period, and in the strategic importance of innovative activity to economic growth. The thesis utilises a case study approach and concentrates on the experiences of one company, the Orbital Engine Corporation (Orbital). In 1989 Ralph Sarich, inventor of the Orbital Combustion Process (OCP) engine and founder of...

Pedersen, Hans Børge

This thesis presents the theoretical models and standards behind the generation of turbu-lence in aeroelastic software. The required knowledge behind offshore wind have beeninvestigated and the necessary changes from onshore wind generation are described. Anintegration between a turbulent wind generator Turbsim and an aeroelastic software, Ashesare implemented, tested and documented. The integration was focused on usability andthe application of standards. A comparison with other tools for turbu...

McCombs, Matthew

A spectral wave model (SWAN) coupled with a depth averaged hydrodynamic model (Delft3D) was used to understand the wave and flow dynamics of the Kingston Basin of Lake Ontario during large winter storm events. This model was then used to assess the impact of an offshore wind farm in the Kingston Basin. Results over different model domains with various forcing methods were compared to achieve the highest correlation with wave, current and water level observations from several locations. Storm eve...

Itoh, Yoshito, Kitane, Yasuo, Chen, Xiao

3rd International Conference on Advances in Experimental Structural Engineering, San Francisco, California, USA, October 15-16, 2009

Gee, Kira

No description available.

Taber, Michael John

Existing guidelines detail assessment criteria that should be used to evaluate offshore emergency response (ER) team members’ performance; however, minimal research has investigated this testing. Therefore, using a Human System Integration approach, this thesis examines the impact of including an electronic Emergency Response Focus Board (ERFB) during simulation testing. Archival ER performance videos were analyzed, subject matter experts (SMEs) were interviewed, and an iterative human-centered ...

Abdulah, Kenneth Christopher

The evolution of the Brazos and Colorado fluvial/deltaic systems over the last 190,000 years is examined. The data set includes high-resolution seismic data, lithostratigraphic data from offshore platform borings, cores and gamma-ray logs, biostratigraphic data, oxygen isotope data, and radiocarbon dates. Major periods of fluvial/deltaic deposition for the Brazos and Colorado fluvial/deltaic systems have been mapped through time, and across 20,000 square kilometers of the Texas continental shelf...

Donley, Mark Gavin

The exploration and production of oil at offshore locations is extending into ever increasing water depths. To exploit this resource in water depths in excess of 300 meters, a new class of offshore structures called compliant platforms are being developed. The compliant nature of these platforms introduces nonlinear behavior which can not be neglected as in conventional offshore platforms. Consequently, new analytical methods to estimate response statistics are needed. Stochastic linearization i...

Long, Martin Troy

The continental shelf offshore Nova Scotia is within a passive margin setting and is an excellent area to study the sequence stratigraphy of late Cretaceous and Tertiary sediments. Hydrocarbon exploration offshore Nova Scotia over the past twenty years has produced a substantial amount of well log data. This study integrates the well log data with seismic and biostratigraphic data to create a sequence stratigraphic framework of late Cretaceouse to middle Miocene strata. Sigma Exploration of Calg...

Schollnberger, Elle Marie

Sequences are recognized throughout the geologic record. The Angolan margin provides an excellent opportunity to examine the factors that control the deposition and preservation of sediments in sequences, as well as the factors that create the erosion or non-deposition along sequence boundaries. The Angolan sequences can be compared to global sequence charts and used to investigate the effects of local events versus global events on the area's sequences. Using seismic sequence stratigraphic prin...