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ABSTRACT In order to improve the interaction and adaptability between ships and complex waterways, this article takes a typical Wujiang 1000-ton cargo ship as an example, using theories and numerical conversion methods such as ship dynamics and maneuverability, to evaluate and analyze its adaptability to waterways from the aspects of ship resistance, maneuverability, and energy efficiency indicators. Obtaining better INTRODUCTION Inland navigation is of great significance to the development of the national economy. With the completion of cascade development and a series of shipping construction projects, the conditions of China's inland waterway have been greatly improved. However, after channelization, China's inland navigable waters have the dual attributes of reservoir channel and mountain channel. The navigation conditions of different sections vary greatly in different seasons, and the local sections or backwater variation sections have the characteristics of large flow velocity, large gradient, shallow channel, and small radius of curvature, resulting in small load of ships sailing in such key sections; The resistance performance and maneuverability are poor, the navigation safety is insufficient, and there are potential safety hazards. The comparative advantages of inland navigation such as large transport capacity, low cost, low energy consumption and light pollution are not fully played. At present, the interaction and adaptability of ships and complex channels is also an important manifestation of the efficiency of ship operation, so it is important to explore the adaptability of navigable ship types and complex channels. Therefore, this paper takes a typical Wujiang 1000-tonnage cargo ship as an example, uses appropriate methods to carry out the assessment and analysis of the adaptability of ships in key sections, and proposes a green ship type technical scheme that is suitable for the complex channel conditions in key sections of Wujiang River and has excellent comprehensive performance.
- Transportation > Marine (1.00)
- Transportation > Freight & Logistics Services > Shipping (0.89)
- Energy > Renewable > Hydroelectric (0.68)
Join Schlumberger Product Champion Nick Fundytus and Geophysics Technical Director Pierre Bettinelli to discuss Optiq* Schlumberger fiber-optic solutions for Borehole Seismic. Optiq solutions provide continuous and instantaneous measurements, and when coupled with Schlumberger's broad digital offering, deliver actionable insights leading to greater operational performance, efficiency, and reduced environmental impact. In this webinar Nick and Pierre will discuss how Optiq works, how fibre-optic solutions for Borehole Seismic can improve your operations, share applications with case studies, while answering your questions and before moving even deeper in to the physics of measurement, job planning, and processing. Nick Fundytus is currently the fiber optics, geophysics, and acoustics product champion for Schlumberger's Reservoir Performance Division. This role involves managing the technology development and commercialization for the aforementioned domains with a focus on providing sustainable solutions to enable the industry to achieve net-zero performance.
- Energy > Oil & Gas > Upstream (1.00)
- Education > Educational Technology > Educational Software > Computer Based Training (0.91)
- Health, Safety, Environment & Sustainability > Sustainability/Social Responsibility > Sustainable development (0.96)
- Production and Well Operations > Well & Reservoir Surveillance and Monitoring > Borehole imaging and wellbore seismic (0.92)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (0.71)
- Health, Safety, Environment & Sustainability > Environment > Climate change (0.59)
The drop in Russian fossil fuel exports after its Ukraine invasion this year will transform the global energy landscape for decades and can help to hasten a green energy transition, the International Energy Agency (IEA) said. The IEA's annual World Energy Outlook acknowledges the economic hit from reduced supplies of Russian oil, natural gas, and coal but is keeping an environmental best-case scenario in which no investment in new fossil fuel projects is needed. The IEA's report said the global energy crisis is causing profound and long-lasting changes that could hasten the transition to a more sustainable and secure energy system. "Energy markets and policies have changed as a result of Russia's invasion of Ukraine, not just for the time being but for decades to come," said IEA executive director Fatih Birol. "The energy world is shifting dramatically before our eyes. Government responses around the world promise to make this a historic and definitive turning point towards a cleaner, more affordable, and more secure energy system", Birol added.
One of the biggest challenges facing the shipping industry in the coming decades is the reduction of carbon emissions. A promising approach to this end is the use of the growing amount of data collected by vessels to optimize a voyage so as to minimize power consumption. The focus of this paper is on building and testing machine learning models that can accurately predict the shaft power of a vessel under different conditions. The models examined include pure empirical models, pure neural network models, and combinations of the two. Using data on two car carrying vessels for 8 years it was found that neural networks incorporating some physical intuition can achieve a mean absolute percentage error of less than 5%, and an R above 95%. This performance can be further improved by the addition of wave information, but it deteriorates when the data collection becomes less frequent.
- Transportation > Marine (1.00)
- Transportation > Freight & Logistics Services > Shipping (1.00)
- Energy > Oil & Gas (1.00)
The consequences of the Ukraine conflict could accelerate Germany's green energy transition despite Berlin's decision to reconnect coal-fired power plants to compensate for falling fossil fuel supplies from Russia, a study showed. The German government has been pushing for a shift to renewable energy, aiming for renewables to contribute 80% of the country's electricity generation by 2030. The study by credit insurer Allianz Trade found that Germany's green energy goals were likely to increase the share of renewable energies in the electricity mix in the medium term, even beyond what would be required to meet the Paris climate targets by 2035. The study found that an increase of coal-fired power generation, which the German government approved earlier this month, will not raise CO2 emissions in the European Union because the production will be limited by the EU emissions trading system.
- Energy > Renewable (1.00)
- Energy > Power Industry (1.00)
- Government > Regional Government > Europe Government > Ukraine Government (0.67)
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Design & Analysis of Integrated Propulsion Systems for High Speed Craft
Savander, Brant R. (Maritime Research Associates) | Kamphuis, Ryan J. (MTU Detroit Diesel) | Thill, Cornel (Maritime Research Institute of the Netherlands) | Herman, Kevin D. (Michigan Wheel Corporation) | Woodruff, Scott (MTU Detroit Diesel)
The work documented herein has resulted from a collaborative research program funded by MTU Detroit Diesel in the high speed craft area with an emphasis on design and analysis of open shaft, strut, propeller, and rudder systems for recreational applications. The program combined both numerical and experimental hydrodynamic analyses throughout the research process. The two primary areas of this effort were associated with planing hull and propulsor hydrodynamics. Numerical results from various ideal flow theories for both planing hulls and cavitating propellers are compared with model test results conducted at the Maritime Research Institute of the Netherlands (MARIN). The model testing program included the traditional experimental matrix of EHP, appended EHP, SHP, and nominal wake survey all in the absence of any influence of cavitation. Cavitation number effects were included through a series of experiments in both a cavitation tunnel and depressurized towing tank at MARIN. Both the numerical and experimental findings are compared with full scale sea trial data from the subject craft, a 70 foot planing hull with a top speed of 50 knots. Research program challenges and areas for further development are presented and discussed.
- Transportation > Marine (1.00)
- Shipbuilding (1.00)
The purpose of this paper is to discuss the measurement of resistance of a ship or an offshore structure in transit or under tow. Since a small replicate of the prototype is used, several simulation difficulties are experienced in the small scale testing. A few of the difficulties of the resistance or drag test and the remedial measures used in the setup and in the scaling up of the model data are discussed here. The standard measurement technique for the resistance of a ship in a towing tank employs a towing staff attached to a dynamometer used for the measurement of the towing resistance. The towing staff is attached to the towing carriage in such a way that the system allows the ship to heave and pitch about the attachment point on the ship, but restrains its motion in the transverse direction. The aft end of the ship model is sometimes provided with a guide system for the side restraint. Offshore structures, however, are often towed in a restraint position, such as in the simulation of current drag. A two staff arrangement for the towing tests is seldom used and is considered unconventional by many of the traditional basins. This paper addresses the difference of towing a· floating offshore model with a single staff (including a guide) versus a two staff arrangement. A ship model was consecutively tested at the simulated transit and loitering speeds in the Offshore Model Basin (0MB) at Escondido, CA in both a two staff and the traditional one staff arrangement. Both the inline and transverse loads were measured during these tests. In addition, the heave and pitch motions of the ship model were also measured. It is found that the results from the two series of tests were identical. Another area of uncertainty is the effect of Reynolds number. The distortion of Reynolds number in the model necessitates certain corrective measures in the model tests. Use of the turbulence stimulator and the quantitative difference in the results with and without this stimulator for an offshore structure model is shown. The simulation of cu t load on an offshore structure is often done by towing e model. The difference between the current load and the equivalent towing load on a particular floating structure model is shown. It is shown that the towing loa were generally smaller than the corresponding current loads.
- Transportation > Marine (1.00)
- Energy > Oil & Gas > Upstream (0.72)
Resistance model test results for a systematic series of low LIB, heavy displacement vessels are presented. The UBC Series is based on west coast seiners and trawlers. These vessels have low LIB and L/V/1/3 values that are outside the range of existing model series data. A parent hull form was developed that has 14% less resistance and yet has the same displacement as a typical fishing vessel. A series of 13 models was generated by systematically varying L/B, BIT and Cb. Results from resistance tests in calm water are presented. From these model tests, an algorithm has been developed to predict the resistance of similar small vessels. The implementation of bulbous bows to the parent hull shows reduction in the overall resistance by approximately 17%. Also, the introduction of stern fairing reduces the resistance by about 25% at the design speed.
- Transportation > Marine (0.73)
- Food & Agriculture > Fishing (0.73)
A standard method for conducting ice resistance model tests as adopted by the Institute for Marine Dynamics is described. The standard procedure involves splitting the total resistance into components; ice breaking, clearing, buoyancy and open water. This allows each component to be treated separately when scaling to full-scale. The analysis procedure is then outlined showing how dimensionless numbers are used to scale the results to full-scale. The basis of the analysis procedure is also given showing how each component of total resistance is affected by model and ice parameters. The result is a rational basis for the conduct and analysis of ice resistance model tests.
Open water characteristics for segmental section propellers are synthesized as a function of pitch ratio, expanded area ratio and number of blades using modifications of the Wageningen B-Screw series polynomials. Thrust and torque limits in a cavitating environment are estimated from maximum thrust and torque load coefficients developed from the Gawn-Burrill cavitation data. Synthesized thrust and torque coefficients as functions of propeller advance coefficient and cavitation number are compared with experimental series data and with commercial propellers of the flat face, segmental section type tested in open water and under cavitating conditions. A procedure for selection of propeller diameter and pitch ratio for best performance -- maximum efficiency and minimal cavitation -- is presented, with number of blades and expanded area ratio being preselected. The method is directed to selection of commercially available propellers for small craft, in lieu of more costly custom design propellers. Reference. is made to computer routines· for expediting propeller selection using synthesized performance data.
- Transportation > Marine (0.68)
- Shipbuilding (0.68)