Topic
Sea trial
About: Sea trial is a research topic. Over the lifetime, 400 publications have been published within this topic receiving 2779 citations. The topic is also known as: shakedown cruise.
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TL;DR: In this article, an estimation-before-modeling (EBM) technique is used to estimate the hydrodynamic coefficients in a ship's state-space model, and an identifiable state space model is constructed in case that current effect is included and the maneuvering characteristics of a ship are analyzed.
130 citations
TL;DR: The system design, sea trials and Antartic exploitation of the SESAMO platform are presented, showing that a relatively simple robot could satisfactorily work in a natural, outdoor environment, dramatically facilitating the job of the human operator.
Abstract: This paper presents the system design, sea trials and Antartic exploitation of the SESAMO platform. The SESAMO (sea surface autonomous modular unit) prototype robot was especially designed to collect data and samples for the study of the sea-air interface. At sea, operations showed that a relatively simple robot could satisfactorily work in a natural, outdoor environment, dramatically facilitating the job of the human operator. To achieve high quality sampling of the surface microlayer, however, requires a large amount of time, leading to significant demands on logistics resources, mainly in terms of operating time of the support vessel.
128 citations
01 Jan 2007
TL;DR: Oyster as discussed by the authors is a near shore flap which is hinge connected to the sea bed, which is used to drive a Pelton wheel in a power take off unit of between 3.5 and 5 MW capacity.
Abstract: In 2005 Aquamarine Power Ltd. was formed to develop Oyster, a near shore flap which is hinge connected to the sea bed. With a combination of private equity and grant aid a 350kW Oyster module has been designed and it is planned to install a prototype module at the EMEC test site in Orkney when the nearshore test berth is available. In this version of Oyster high pressure sea water will be pumped ashore to drive a Pelton wheel. Ultimately it is envisaged that Oyster units will be arranged in clusters feeding power to a power take off unit of between 3.5 and 5 MW capacity. Arrays of clusters will form power stations of 20 to 100 MW capacity. An extensive research and development programme has produced a very efficient structural form, which gives Oyster one of the highest power to weight ratios of all current technologies combined with high capture factors in the most commonly occurring seas. The sea bed foundations and installation technique developed enables Oyster to be easily removed and reinstalled for major maintenance when required. This is a feature normally associated with moored devices. Although there are other bottom-hinged flap devices, Oyster is different in several ways and occupies a different part of the design space. For example, unlike the other systems it completely penetrates the water column from the water surface to the sea bed. Although it might be considered that such a system would be vulnerable in extreme seas, extensive wave tank modelling has shown that the flap intrinsically decouples from the wave as the oscillation increases and that the wave loads experienced are manageable in the three operational modes; generating, undamped and parked on the sea bed. However, model tests show that Oyster can remain generating in all sea-states including plunging breakers. This paper charts the evolution of Oyster presenting some of the research that has led to the current design. An outline of the impending sea trials of a prototype demonstration unit is given along with the projected outcomes.
93 citations
TL;DR: In this paper, a comparison between sea trial measurements and full-scale CFD results is presented for two self-propelled ships, a general cargo carrier and a car carrier.
77 citations
TL;DR: In this article, the feasibility of using data from an experimental wave profiling radar in achieving short-term deterministic sea wave prediction (DSWP) was explored, and two forms of DSWP were employed: a fixed point system based upon a restric...
Abstract: For a number of maritime tasks there is a short time period, typically only a few tens of seconds, where a critical event occurs that defines a limiting wave height for the whole operation. Examples are the recovery of fixed and rotary winged aircraft, cargo transfers, final pipe mating in fluid transfer operations, and launch/recovery of small craft. The recovery of a 30-t rescue submersible onto a mother ship in the North Atlantic Treaty Organization (NATO) Submarine Rescue System is a prime example. In such applications short-term deterministic sea wave prediction (DSWP) can play a vital role in extending the sea states under which the system can be safely deployed. DSWP also has great potential in conducting experimental sea wave research at full scale. This report explores the feasibility of using data from an experimental wave profiling radar in achieving DSWP. The report includes theory, simulation, and field testing. Two forms of DSWP are employed: a fixed point system based upon a restric...
51 citations