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Ice TechnologyWith the 90 Meter Ice/Towing Tank, Oceanic has the ability to conduct tests in ice for a wide range of icebreaking ships and offshore structures. A typical ship model test program in one ice sheet would include: ice resistance (three speeds), propulsion tests (three speeds), turning circle experiments, and ridge ramming. Ice monitoring and control would include: ice thickness survey, flexural strength, compressive and shear strength, ice density and friction coefficient between the hull and the ice. For testing of offshore structures, a six-component global base dynamometer records loads on the structure. In addition to test programs, the Planar Motion Mechanism (PMM) can be installed to allow captive maneuvering experiments to be made. The PMM has 'plug-in' modules that allow testing of structures and moored buoys while the ice moves in a curvilinear path relative to the vessel simulating changes in ice drift direction. To date, over 1000 ice sheets have been grown in the ice tank and an extensive database of ship and offshore structures exists. Oceanic's expertise in ice technology is backed by experience in understanding the conditions of the North Atlantic. Background in assessing models for the severe conditions in the North Atlantic is one of the reasons designers and owners of marine systems choose Oceanic for performance evaluation services.
ManeuveringOceanic has facilities to conduct maneuvering tests in ice or open water for marine systems. Ship maneuvering studies are accomplished using the Planar Motion Mechanism attached to the 200 Meter Towing Tank or the 90 Meter Ice/Towing Tank. Standard tests such as static yaw and rudder sweeps, pure yaw and sway tests are carried out in these tanks. On-the-fly analysis procedures allow maneuvering derivatives to be calculated as testing proceeds. Using these derivatives all the standard maneuvers required by IMO can be simulated on a desktop. For submarines and towed bodies, the Marine Dynamics Test Facility is available. A test model is mounted on a sting and computer controlled motors allow sway, yaw, heave pitch and roll motions to be individually controlled which force the model to move with 6 degrees-of-freedom. For testing offshore structures in open water, the Offshore Engineering Basin is ideal, as wind, waves, and current can be all modeled simultaneously. Maneuvering tests in ice for both offshore structures and icebreaking ships takes place in the ice/towing tank, where refrigerated fine-grained columnar ice is manufactured to a scaled thickness and flexural strength.
Numerical SimulationThe complex relationship between structure and environment is essential to understanding marine performance. For over 100 years, engineers have relied on physical models to provide insight into this relationship, accepting the limitations of the approach as an acceptable compromise. Modern computing capacity has helped to overcome some of those limitations. Benchmarked and validated against full scale and model scale data, simulation technology allows flexibility unheard of just ten years ago. In some cases, simulation can lead to a final answer. In others, such techniques can augment physical testing and are a cost-effective and intrinsic part of the physical modeling process. Oceanic’s numerical strategy is developed with a solid understanding of the strengths and weaknesses of the available numerical tool and its physical modeling equivalent. With in-house and commercial codes available, Oceanic’s numerical simulation capability closely matches its capacity for physical modeling, from extreme seas to severe ice. Using MOTSIM, a time domain panel method, seakeeping analyses can be expanded to conditions impossible to model in any wave basin. Using discrete element modeling, DECICE can provide insight into the phenomena associated with failure of ice around ships and offshore structures. In-house tools for simulating maneuvering, propulsion performance and hull flow visualization, along with commercially available computational fluid dynamics codes round out a strong numerical capacity that can stand alone or support the firm’s physical modeling services.
Other ServicesIn addition to the testing services described under separate sections, Oceanic also provides support to designers and manufacturers of marine systems in the following areas: Lines Review Propeller and Appendage Design Review and Modifications Modeling of Mooring Systems and Risers Maneuvering Assessments Specialized Services for Offshore Topside Modules Interpretation of Wind Tunnel Tests Assistance with Regulatory and Class Approvals Marine Safety Equipment Assessment Risk and Reliability Assessments Interpretation of Environmental Data Model Fabrication
Physical ModelingProviding insight into vessel behaviour and limitation, model testing is an opportunity to challenge the conventional and create the exceptional. With one of the world’s most comprehensive suites of test facilities available, Oceanic can tailor a physical modeling program using the best tool for the job. Each physical modeling program the firm undertakes involves close liaison with the client to ensure a clear question results in a straightforward answer. Creating accurate scale models and simulating real-world environments through the application of state-of-the-art test facilities, techniques and technologies, Oceanic proves the performance of client concepts and assists in advancing the design through solid analysis coupled with the benefit of considerable experience. The firm produces reliable data about how each design will perform in the real world and can offer a wide assortment of configurations and designs for varying conditions. Oceanic’s facilities include: 200 Meter Towing Tank • 90 Meter Ice/Towing Tank • 58 Meter Towing Tank • Offshore Engineering Basin • Cavitation Tunnel• 22 Meter Flume Tank • Centre for Marine Simulation.
Resistance and Propulsion
Resistance and PropulsionOceanic conducts model scale resistance and propulsion experiments on all types of marine vessels, including: motor yachts, cruise ships, large icebreakers, ferries, tugboats, trawlers, warships, floating production storage and offloading systems, life rescue crafts, and numerous other seagoing vessels. Model testing for resistance and propulsion is significant for fine-tuning the operation of a vessel to meet its mission. Resistance experiments in model scale are used to predict resistance and effective horsepower of a vessel. Propulsion experiments are carried out in conjunction with resistance experiments to predict the required shaft horsepower of a vessel. All experiments conducted by Oceanic are in accordance with the recommendations of the International Towing Tank Committee (ITTC), which has published standard procedures for these tests.
SeakeepingOceanic conducts seakeeping evaluations on a wide range of marine systems, from supply vessels and motor yachts to warships and large oil production and storage structures. Knowing the performance of a vessel in a seaway can be significant for the design of hull structure and for the placement of crucial on-board equipment. In addition, with the increasing concern for passenger comfort, knowledge of wave-induced motions and accelerations is becoming increasing important for designers of passenger-carrying vessels. During physical model testing, Oceanic can record measurements for a wide range of parameters, limited only by the size of the model. On the structural side, measurements of global (hull-girder) loads and local (e.g. slamming) loads can be recorded in real-time along with propulsion system response (thrust, torque) and rudder angles. Measurements of rigid-body and localized accelerations are also commonly recorded. In multi-directional seas in Offshore Engineering Basin, model position and attitude are recorded via a non-contact optical tracking system to eliminate interference. For all tests in waves, high-quality video recording is offered, and video results can be time-scaled to reflect the performance of the full-scale vessel. While direct measurements on scale models is perhaps the more common approach to seakeeping studies, the physical capabilities at Oceanic are enhanced by numerical analysis using a proprietary 3-D time domain simulation code. The optimum method of evaluating a particular design is generally some combination of these elements, adjusted to meet the requirement of the client. By benchmarking numerical results with model data in critical areas allows a designer to explore vessel and sea conditions that would be prohibitively expensive or even impossible with a physical model.
Ship SimulationSince every design program involves questions related to operations and operability, Oceanic is equipped to provide support in this area. Widely employed for training bridge officers, the Ship Bridge Simulator of the Centre for Marine Simulation provides a capability to assess in real time, with an operator involved, whether a design is capable of meeting its intended operational functions. Various issues are addressed such as: bridge layout, bridge visibility, and the ability to navigate a particular approach to a harbor, loading buoy or offshore structure. As well, full dynamic positioning and thruster control can be modeled over a wide range of environmental conditions, with reference data extracted from earlier model test programs.
Wave/Structure InteractionWith access to world class wave and ice basins, Oceanic provides ideal facilities to test wave/structure interactions. Past work includes world-renowned structures such as the Hibernia GBS, Ekofist complex, Molikpaq and Confederation Bridge. Work has also been conducted on smooth and faceted conical structures operating in ice. . Force panels measure local wave forces on decks and topside structures. These have natural frequencies in excess of 100 Hz and coupled with very high data acquisition rates (>1000 Hz) they accurately quantify peak loads. High aggregate rates mean many channels can be acquired simultaneously and over long periods. Specially fabricated six component dynamometers can be fitted to measure global forces on structures or their sub-components. Repeated snapshots of significant wave events extracted from the wave time history allow statistically significant results to be obtained quickly. The ice basin has the capability to either tow the structure though the ice field or push the ice sheet into the stationary structure. Oceanic engineers can numerically model a wide range of ice-structure interaction problems using discrete element software DECICE.
Propulsion / Power