Underwater construction 2013 - 2015
MARINET (Marine Renewables Infrastructure Network for
Emerging Energy Technologies) is an EC-funded network
of research centres and organizations working together to
accelerate the development of marine renewable energy -
wave, tidal & offshore wind.
This initiative consists of five main Work Package focus
areas: Management & Administration, Standardisation &
Best Practice, Transnational Access & Networking,
Research, Training & Dissemination.
The aim is to streamline the capabilities of test
infrastructures in order to enhance their impact and
accelerate the commercialisation of marine renewable
energy.
Hydro energy, wind energy, and solar energy will be
mainly utilized in Indonesia to fulfill the energy of remote
villages and remote islands and optimize the domestic
energy availability. Regarding the small-scale field research
conducted during 2012 and 2013 in Indonesia,
transmission systems and low rpm alternators
encountered significant problems during the
development of the hydro and wind turbine engines.
This paper presents the tidal stream turbine types and
some information about current and future power
stations.
Tidal current technologies have advantages over fossil
energy: They are cleaner and provide security and
diversity of supply with limited social and environmental
impacts. Their main inconvenience is that they provide
intermittent power. However, this is predictable, and so
this problem can be controled.
This project set out to make the initial design proposal of a
2 x 4 meter H-shaped Darrieus turbine by applying the
Double Multiple Streamtube model. The optimization
process was performed with the aid of MATLAB for four
different foils. The study included two symmetrical foils;
NACA 0012 and S-1046, together with two asymmetrical
foils; S-1210 and E216. The parameters studied were the
number of blades, chord length, tip speed ratio, fixed
pitch, and operational range. Effects such as blade to
wake interaction, torque fluctuations, etc., were also
considered.
This paper deals with the control strategies for a fixed-
pitch Marine Current Turbine (MCT) when the marine
current speed exceeds the rated value corresponding to
the rated power of the generator and converter. Over-
rated marine currents occur at large spring tides or under
strong sea states; in these cases, Maximum Power Point
Tracking (MPPT) strategies must be changed to power
limitation strategies for limiting the generator power at
rated value.
Two power limitation strategies are investigated in this
study.
The International Renewable Energy Agency (IRENA) is an
intergovernmental organization that supports countries in
their transition to a sustainable energy future and serves
as the
the principal platform for international co-operation, a
centre of excellence, and a repository of renewable
energy policy, technology, resource, and financial
knowledge.
IRENA promotes the widespread adoption and
sustainable use of all forms of renewable energy,
including bioenergy, geothermal, hydropower, ocean,
solar, and wind energy.
This paper describes the structural design of a tidal turbine
composite blade. The structural design is preceded by two
steps: hydrodynamic design and determination of
extreme loads.
The hydrodynamic design provides the chord and twist
distributions along the blade length that result in optimal
performance of the tidal turbine over its lifetime.
The extreme loads, i.e., the extreme flap and edgewise
loads that the blade would likely encounter over its
lifetime, are associated with extreme tidal flow conditions
and are obtained using computational fluid dynamics
(CFD) software
Certification according to this service specification is a
procedure by which DNV GL gives written assurance that
a product design, manufacturing, commissioning,
operation, and maintenance processes or services,
conform to requirements specified in this service
specification.
Britain’s Bristol Channel and adjoining Severn estuary
together form a long and funnel-shaped area of sea,
causing the tidal range to increase from a maximum of 7
m at the outer reaches to about 14 m at Avonmouth. This
is the second highest tidal range in the world. There is,
thus, considerable energy locked up in the tidal excursion.
Tidal energy can either be harnessed by damming a
portion of the estuary and using the subsequent head
differential to generate power from the tidal range or else
having turbines underwater in the sea, similar to wind
turbines, developing energy from the flow of the tidal
currents. This paper looks at the various ways the tidal
energy from the Severn estuary/Bristol Channel could be
harnessed. This paper thus provides an overview of the
Severn estuary as a tidal energy source, including the
potential schemes, their issues, and their benefits.
This paper presents an investigational study on Wave
Energy Converters (WECs). Design considerations for
implementing them in the Gulf of Mexico are also
evaluated.
This document is the US Patent file for a system to convert
kinetic wave energy from a dynamic fluid into electrical
power through a piezo kinetic assembly,
This document, written in 2014, is another presentation of
the various wave energy convertion systems.
This document is another US Patent file regarding a
system for using wave energy on offshore, nearshore, or
onshore facilities.
This document can be seen as a complementary study of
the others available on the website regarding the
development of air turbines for wave energy conversion.
The authors review several solutions starting from
conventional turbines to self-rectifying units.
Inventors: De Oliveira Falcao, De Carvalho Gato, & De
Campos Henrique
This document is the international patent file of an air
turbine capable of, without changing its rotational velocity
direction, efficiently absorbing the energy associated with
pressure differences that successively change sign, as in
the case of some sea wave energy conversion systems.
This study discusses selected technical solutions
generating electricity from waves. The research of the
Maritime University of Szczecin, Poland, regarding wave
energy conversion into electricity and using coast
protection against waves are presented. The potential of
waves as a renewable energy source (in Europe and
outside) is also evaluated, and the problems that may be
encountered are outlined.
This invention is based on a structure driven by floats for
converting Wave energy into electricity. The structure
comprises a floating body to float and stabilizes the
structure in the water, wherein a platform is provided to
house and hold energy conversion systems and
mechanisms.
Sea fastening must be laid out to cope with the maximum
operating transit criteria for H; this is important for the
transit criteria. If this is low, the operational envelope is also
low. Therefore, the designer, typically the naval architect,
will look at the maximum g-force the turbine components
will allow in any direction. This will be the governing
parameter for the sea fastening.
The operational envelope and the maximum g-forces on
the components are then determined by the vessel
motion and the corresponding maximum sea state in
which they occur.
An original workgroup comprising ASCO, BP Amoco
(now BP), Gulf Offshore, Seaforth Maritime, Shell, Swire
and Texaco was established by the Marine Safety Forum
(MSF) to consider the hazards and risks associated with
the safe packaging and handling of cargo to and from
offshore installations. The objective of the workgroup was
to identify areas where additional guidance would help to
secure improvements in safety.
Offshore geotechnical engineering is closely connected to
onshore practice, but it tends to diverge due to the
different scales of the foundations and fundamental
differences in installation techniques. The stiffness of the
structure compared to the stiffness of the soil is by many
orders higher in the case of offshore foundations – mud
mats, suction piles, spud cans, and large monopiles. It is
possible to define the behavior of these structures as the
behavior of a rigid body with six degrees of freedom and
to apply forces to the reference point.
Authors: kshaykumar Ardeshana, Jayeshkumar Pitroda,
J.J.Bhavsar
This paper provides information on tunnels and
various tunneling operations involved to make tunnel and
also provide information related to old methods of
tunneling and new methods of tunneling using
ultramodern technology. Some case studies are also there
related to the modern technology used tunnel
construction
Authors: Labban R, Abourizk S, Haddad Z, El-Sersy A
This paper explains the effectiveness of computer
simulation methods in managing large and complex
construction operations. It highlights how simulation
models can be used to design and analyze construction
processes, test different scenarios, estimate resource
utilization, identify bottlenecks, and forecast time and cost
requirements. Additionally, it introduces a specific example
of a pipe spool fabrication model built by Consolidated
Contractors Group (CCC).
Authors: Alain Michel Jules Norro, Bob Rumes, and Steven
Johan Degraer
This document intends to compare the underwater noise
generated during the piling activities of steel monopiles
and jacket pinpiles used in offshore wind farms in the
Belgian part of the North Sea, providing a detailed analysis
of the noise levels, including zero to peak sound pressure
level (Lz-p), unweighted sound exposure level (SEL),
cumulative SEL, and 1/3 octave spectra, measured at
various distances from the pile driving location. It also
discusses the duration of piling activities and the potential
behavioral disturbance to marine life.
Authors: W. O. Ajagbe, E. O. Ilugbo, J. O. Labiran, and A.
A. Ganiyu
This paper describes a research study focused on
analyzing and designing a fully submerged underground
reinforced concrete water tank using the beam-on-elastic
foundations principle to ensure it remains crack-free. It
also discusses the development of a Microsoft Excel
Spreadsheet Design and Analysis Program (MESDAPro)
for quick assessment of various structural moments,
geometrical features, and soil conditions of the tank in
both full and empty states. Additionally, it highlights how
different factors, such as soil subgrade modulus and tank
height, affect the moments experienced by the tank.
Authors: Jol Godbold and Nikki Sackmann
This paper discusses the lack of a uniform methodology
for concrete mattress stability design in the offshore
industry and introduces a proposed industry design
methodology. It reviews previous design works and
suggests a comprehensive approach that includes
recognized pipeline codes, standards, and various
modeling and testing techniques.
This document explains the scope of Offshore Installations
(Offshore Safety Directive) (Safety Case, etc) Regulations
2015 (SCR 2015), including their applicability to oil and gas
operations in external waters and their purpose in
enhancing safety and environmental protection.
Author: Terje Aven
This paper, published in 2015, provides an overview of
the advances in the field of risk assessment and
management, focusing on fundamental ideas and trends.
This document is intended for a broad audience,
including those who may not be experts in this field, and
seeks to reflect on areas where further development is
needed.
Click on the
octopus to return to
the top of the page
05 - Connection of an offshore wind park to HVDC converter
platform without using offshore AC collector platforms.
Authors: Haseeb Ahmad, Steven Coppens, Bahri
Uzunoglu
Several large-scale offshore wind farms are planned for
the future. High Voltage Direct Current (HVDC) Light by
ABB is an effective way to connect this wind power to the
grid. The offshore AC collector platform is a costly part of
the setup. This paper compares two types of connections:
one with and one without an offshore AC collector
platform. The study looks at the technical feasibility and
challenges of each method, including short circuit and
energy loss analyses with different wind turbine types and
distances from the converter platform.
