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Hydrodynamic Performance of Flapping-foil Propulsion in the Influence of Vortices
flapping-foil vortex numerical simulation hydrodynamic performance save energy
2011/9/9
Fish are able to make good use of vortices. In a complex flow field, many fish continue to maintain both efficient cruising and maneuverability. Traditional man-made propulsion systems perform poorly ...
A Feasibility Study on a New Trimaran PCC in Medium Speed –Performance in Still Water and Strong Wind
trimaran Pure Car Carrier EHP drift angle speed reduction
2011/9/9
In the present paper, a new trimaran Pure Car Carrier (PCC) is proposed and a feasibility study on the ship is carried out. In this study, first, the effective horse power (EHP)/car of the PCC running...
Simulating Underwater Plasma Sound Sources to Evaluate Focusing Performance and Analyze Errors
underwater plasma sound source focusing sound field error analysis 3D Max
2011/9/9
Focused underwater plasma sound sources are being applied in more and more fields. Focusing performance is one of the most important factors determining transmission distance and peak values of the pu...
Research on the dynamic performance of ship isolator systems that use magnetorheological dampers
magnetorheological fluid damper vibration reduction shock resistance isolator
2011/9/13
Isolator systems on ships should ideally be able to simultaneously reduce low frequency vibration response and high frequency shock response. Conventional isolator systems are unable to do so. To solv...
Using the surface panel method to predict the steady performance of ducted propellers
surface panel method ducted propeller velocity potential iteration steady hydrodynamic performance
2011/9/13
A new numerical method was developed for predicting the steady hydrodynamic performance of ducted propellers. A potential based surface panel method was applied both to the duct and the propeller, and...
A comparison of the performance of 4D-Var in an explicit and implicit version of a nonlinear barotropic ocean model
4D-Var explicit and implicit version nonlinear barotropic ocean model
2009/11/3
A comparison is made of the performance of the four-dimensional variational data assimilation (4D-Var) method in an explicit and implicit version of a barotropic quasi-geostrophic model of the wind-dr...
The motion performance and mooring system of deepwater semi-submersible drilling unit
deepwater semi-submersible drilling unit motion response response amplitude operators (RAO) mooring system
2011/9/13
This paper analyzes the motion performance and mooring system of deepwater semi-submersible drilling unit in the district of the South China Sea using the MOSES procedure system. After the 3-D panel m...
An investigation of the performance of an electronic in-line pump system for diesel engines
EIP marine engine fuel injection system AMESim
2011/9/14
WIT Electronic Fuel System Co.,Ltd. has developed a new fuel injector,the Electronic In-line Pump (EIP) system,designed to meet China’s diesel engine emission and fuel economy regulations. It can be u...
Modeling Spectral Dissipation in the Evolution of Wind Waves. Part I：Assessment of Existing Model Performance
Wind Waves Modeling Spectral Dissipation Existing Model Performance
2008/12/16
This study examines the performance of a state-of-the-art spectral wind wave model that uses a full solution to the nonlinear interaction source term. The situation investigated here is fetch-limited ...
Direct tension and fracture resistance curves of ultra high performance marine composite materials
ultra high performance cementitious composites fracture resistance curve direct tension
2011/9/14
Fracture behavior is one of the most important, yet still little understood properties of ultra-high performance cementitious composites (UHPCC), a new marine structural engineering material.Research ...
Body temperature during low tide alters the feeding performance of a top intertidal predator
Body temperature low tide alters feeding performance intertidal predator
2014/4/18
Although the direct effects of climate change on species distribution andabundance have become increasingly apparent, considerably less is known about the potential for thermal variations to influence...
Propulsive performance and flow field characteristics of a 2-D flexible fin with variations in the location of its pitching axis
analytic network process (ANP) underwater multi-target tracking decision tracking logic
2011/9/13
The thrust coefficients and propulsive efficiency of a two-dimensional flexible fin with heaving and pitching motion were computed using FLUENT. The effect of different locations of the pitching axis ...
Research on the dynamic performance of ship isolator systems that use magnetorheological dampers
magnetorheological fluid damper vibration reduction shock resistance isolator
2011/9/13
Isolator systems on ships should ideally be able to simultaneously reduce low frequency vibration response and high frequency shock response. Conventional isolator systems are unable to do so. To solv...
Valuable mineral resources are widely distributed throughout the seabed. autonomous underwater vehicles (AUVs) are preferable to remotely-operated vehicles (ROVs) when probing for such mineral resources as the extensive exploration area makes it difficult to maintain contact with operators. AUVs depend on batteries, so their power consumption should be reduced to extend exploration time. Power for conventional marine instrument systems is incorporated in their waterproof sealing. External intermittent control of this power source until termination of exploration is challenging due to limitations imposed by the underwater environment. Thus, the AUV must have a power control system that can improve performance and maximize use of battery capacity. The authors developed such a power control system with a three-step algorithm. It automatically detects underwater operational states and can limit power, effectively decreasing power consumption by about 15%.
surface piercing propeller boundary element method hydrodynamic characteristics
2011/9/13
Demand for high-speed marine vehicles (HSMVs) is high among both commercial and naval users. It is the duty of the marine vessel’s designer to provide a hull and propulsion system that diminishes drag...
Using the surface panel method to predict the steady performance of ducted propellers
surface panel method ducted propeller velocity potential iteration steady hydrodynamic performance
2011/9/13
A new numerical method was developed for predicting the steady hydrodynamic performance of ducted propellers. A potential based surface panel method was applied both to the duct and the propeller, and...