scholarly journals FEATURES OF POWER DETERMINATION OF AUXILIARY-EMERGENCY DRIVE MOTION OF A SHIP WITH A COMBINED DIESEL-ELECTRIC POWER PLANT

2020 ◽  
Vol 4 (52) ◽  
pp. 8-16
Author(s):  
A. Rak ◽  
◽  
V. Busher ◽  
O. Glazeva ◽  
◽  
...  
Keyword(s):  
Fuel Consumption ◽  
High Speed ◽  
Electric Capacity ◽  
Optimal Load ◽  
High Speed Diesel ◽  
Harmful Emissions ◽  
Diesel Generators ◽  
Main Engine ◽  
Engine Power

Purpose. The paper compares the traditional method of calculating the parameters of electric motion of ships in auxiliary emergency modes at low speeds of the vessel with another, simplified because it does not require the use of a large number of diagrams to determine the resistance of the vessel. But according to a simplified method for this example – a container ship with a capacity of 16,000 containers with the main engine capacity of 61776 kW, a synchronous machine with a capacity of up to 6 MW in engine mode, and three diesel generators with an electric capacity of 3187 kW – 39 % more power is obtained. Own experience of operation of the vessel in modes with electric movement – loading of diesel generators in this mode on the vessel about 70 % that is received by calculations. Thus, when upgrading the propulsion system or designing new vessels, it is advisable to compare the results of two calculations of the power of diesel generators at the limit of the minimum stable speed of the main engine and choose the larger of the results. Methodology. Comparison of specific and absolute fuel consumption, made on the basis of known approximation polynomials for low- and high-speed types of diesel of the company at auxiliary emergency movement shows that at the movement from high-speed diesel generators MAK8M32S fuel consumption decreases by 24 %, then at the maintenance of the main engine 12 RTflex-96C from WÄRTSILÄ-SULZER. Results. Therefore, the use of electric motion allows you to save engine power of the main engine, reduce fuel consumption. This ratio is observed on most maritime transport vessels. And given that diesel generators operate at almost optimal load, and the main engine – at idle, electric motion provides a significant reduction in harmful emissions into the atmosphere. The latter is also true for a ship where the synchronous engine is located behind the main engine, although fuel consumption, in this case, increases by 32 %. Figures 9, tables 6, references 15.

scholarly journals A Study on Characteristic Emission Factors of Exhaust Gas from Diesel Locomotives

2020 ◽  
Vol 17 (11) ◽  
pp. 3788 ◽  
Author(s):  
Min-Kyeong Kim ◽  
Duckshin Park ◽  
Minjeong Kim ◽  
Jaeseok Heo ◽  
Sechan Park ◽  
...  
Keyword(s):  
Fuel Consumption ◽  
Environmental Protection Agency ◽  
High Speed ◽  
Emission Factors ◽  
Exhaust Emission ◽  
Emission Measurement ◽  
Exhaust Gas ◽  
Diesel Locomotive ◽  
Diesel Vehicles ◽  
Engine Power

Use of diesel locomotives in transport is gradually decreasing due to electrification and the introduction of high-speed electric rail. However, in Korea, up to 30% of the transportation of passengers and cargo still uses diesel locomotives and diesel vehicles. Many studies have shown that exhaust gas from diesel locomotives poses a threat to human health. This study examined the characteristics of particulate matter (PM), nitrogen oxides (NOx), carbon monoxide (CO), and hydrocarbons in diesel locomotive engine exhaust. Emission concentrations were evaluated and compared with the existing regulations. In the case of PM and NOx, emission concentrations increased as engine output increased. High concentrations of CO were detected at engine start and acceleration, while hydrocarbons showed weakly increased concentrations regardless of engine power. Based on fuel consumption and engine power, the emission patterns of PM and gaseous substances observed in this study were slightly higher than the U.S. Environmental Protection Agency Tier standard and the Korean emission standard. Continuous monitoring and management of emissions from diesel locomotives are required to comply with emission standards. The findings of this study revealed that emission factors varied based on fuel consumption, engine power, and actual driving patterns. For the first time, a portable emission measurement system (PEMS), normally used to measure exhaust gas from diesel vehicles, was used to measure exhaust gas from diesel locomotives, and the data acquired were compared with previous results. This study is meaningful as the first example of measuring the exhaust gas concentration by connecting a PEMS to a diesel locomotive, and in the future, a study to measure driving characteristics and exhaust gas using a PEMS should be conducted.

scholarly journals Influence of Marine Main Engine Foundations on the Results of Vibration Calculations

2019 ◽  
Vol 26 (1) ◽  
pp. 95-101
Author(s):  
Lech Murawski
Keyword(s):  
Boundary Conditions ◽  
Ship Hull ◽  
Fem Model ◽  
Shaft Line ◽  
Marine Engines ◽  
Thermal Displacements ◽  
Engine Dynamic ◽  
Main Engine ◽  
Engine Power

Abstract The article presents an influence of foundations of slow-speed main engine body on the results of numerical analysis of the engine dynamic stiffnesses and thermal deformations. The engine body is much stiffer than its foundation pads and ship hull (double bottom) – boundary conditions of the engine. Especially for the high power, marine engines, the correct model of the boundary conditions plays a key role during the analyses. Therefore, modelling method of engine foundation (boundary conditions) of that kind of model is essential during the analyses. During shaft line alignment and crankshaft springing analyses, knowledge of dynamic stiffnesses characteristics and thermal displacements of radial (main) bearings is significant. Those data of marine main engine body are difficult to estimate because of lack of available documentation and complicated shape of the engine and ship hull. The article presents the methodology of the characteristics determination of the marine engine's body as well as the example of computations for a MAN B&W K98MC type engine (power: 40000 kW, revolutions: 94 rpm) mounted on a 3000 TEU (twenty-foot container equivalent unit) container ship (length: 250 m). Numerical analyses were performed with usage of Nastran software based on Finite Element Method. The FEM model of the engine body comprised over 800 thousand degree of freedom.

Experimental optimization of hydrodynamic performance of catamarans using hydrofoil element

2018 ◽  
Vol 233 (2) ◽  
pp. 488-501 ◽  
Author(s):  
Amin Najafi ◽  
Taghi Aliakbari ◽  
Seyed Abolfazl Hashemi
Keyword(s):  
Experimental Data ◽  
Fuel Consumption ◽  
Marine Environment ◽  
High Speed ◽  
Hydrodynamic Performance ◽  
Environment Pollution ◽  
Fuel Cost ◽  
Energy Consumption Reduction ◽  
Consumption Reduction

Daily increase in fuel cost and also marine environment pollution tends designers and engineers to design and optimize based on reducing losses and energy consumption. Reduction of fuel consumption and marine environment pollution are categorized in high priority problems in design of new vessels and optimization of current ones. Using hydrofoil between two hulls is one of the best strategies in optimization cycle of fuel consumption of catamarans. HYSUCAT comes from “Hydrofoil Supported Catamarans” and stands for a vessel which is composed of a catamaran hull and hydrofoils mounted between two hulls. These hydrofoils tolerate part of hull weight in high speed and decrease wetted surface of vessel. This element reduces drag of vessel and consequently fuel consumption by decreasing the wetted surface. This research deals with determination of a suitable hydrofoil section to reduce drag and increase stability of a catamaran vessel using experimental data. Full-scale foils were constructed and mounted on a vessel in continue, and its performance was examined in sea tests. Determining the best section and also the most suitable position for mounting the foil is a novel study in the field of hydrodynamics of catamaran vessels.

Research on Fixed Route Speed Optimization Based on Deep Neural Network and Genetic Algorithm

2020 ◽  
Author(s):  
Ziming Wang ◽  
Shunhuai Chen ◽  
Liang Luo
Keyword(s):  
Neural Network ◽  
Genetic Algorithm ◽  
Fuel Consumption ◽  
Bp Neural Network ◽  
Optimization Model ◽  
Power Model ◽  
Multi Objective ◽  
Speed Optimization ◽  
Main Engine ◽  
Engine Power

Abstract In the downturn of the shipping industry, optimizing the speed of ships sailing on fixed routes has important practical significance for reducing operating costs. Based on the ship-engine-propeller matching relationship, this paper uses BP neural network to build main engine power model, and correction factors are introduced into the main engine power model to reflect the influence of wind and wave. The Kalman filter algorithm is used to filter the data collected by a river-sea direct ship during the voyage from Zhoushan to Zhangjiagang. The filtered data and the meteorological data obtained from the European Medium-Range Weather Forecast Center are used as the data set of the BP neural network to predict the main engine power. Based on the main engine power model, a multi-objective optimization model of ship speed under the influence of actual wind and waves was established to solve the conflicting goals of reducing sailing time and reducing main engine fuel consumption. This multi-objective model is solved by a non-dominated fast sorting multi-objective genetic algorithm to obtain the Pareto optimal solution set, thereby obtaining the optimal speed optimization scheme. Compared with the original navigation scheme, the navigation time is reduced by 8.83%, and the fuel consumption of the main engine is reduced by 12.95%. The results show that the optimization model can effectively reduce the fuel consumption and control the sailing time, which verifies the effectiveness of the algorithm.

Fuel Consumption in Container Ships on the North Atlantic

1985 ◽  
Vol 38 (02) ◽  
pp. 258-265
Author(s):  
R. Motte ◽  
C. A. Laurence
Keyword(s):  
Fuel Consumption ◽  
North Atlantic ◽  
Engine Performance ◽  
Economic Approach ◽  
Operation System ◽  
Performance Variables ◽  
The North ◽  
The Subject ◽  
Main Engine

Commercial interests now demand a close awareness of fuel consumption, which is one of the major costs in vessel operation. This paper outlines one shipping operator's attempts to monitor and improve economic performance as indicated by fuel consumption alone. The authors are well aware that some aspects of operation, such as main engine performance variables, are closely and easily monitored whilst others such as environmental effects are not. They have therefore adopted a ‘macro-economic’ approach to the analysis and advice on Fleet operation in this instance, attempting to monitor the vessel operation system as a whole. Thus fuel consumption is used as a yardstick and it is this particular variable which is the subject of management focus. Although many of the inputs to the complete economic equation are necessarily unquantifiable in precise terms, it is considered that a valid determination of performance is attainable from a scientifically based overview.

scholarly journals DETERMINATION OF ELEMENTS AND CHARACTERISTICS OF RIVER SUCTION DREDGERS AT INITIAL DESIGN STAGES

2020 ◽  
pp. 71-80
Author(s):  
Ernest G. Rumyantcev ◽  
Evgeniy P. Ronnov
Keyword(s):  
Statistical Method ◽  
Research Design ◽  
Soil Productivity ◽  
Technical Data ◽  
Total Displacement ◽  
Wide Range ◽  
Main Engine ◽  
Analytical Expressions ◽  
Engine Power

The article provides a methodology for calculating the basic elements and characteristics of river dredgers at the stages of research design by means of the statistical method. For the study, the most common projects of river non-self-propelled dredgers with both a residential superstructure and without it, in a wide range of soil productivity, were used. The dependences of the total displacement and the main engine power on such basic technical data as suction dredger performance and loosening depth were analyzed in detail. Graphic dependencies and analytical expressions for determining the main suction dredger dimensions were obtained. The issue of choosing the length of the main dredger compartments is considered, which allows to solve the problem of pre-splitting the hull into compartments. The analysis of the accuracy of the obtained statistical dependencies for determining the length of the vessel is provided.

Numerical Analysis of Flow Characteristics in a Swirl Chamber Type Diesel Engine Depending on Passage Hole Type

2005 ◽  
Author(s):  
Gyeung Ho Choi ◽  
Tae Yun Kwon ◽  
Ju Hee Yun ◽  
Yon Jong Chung ◽  
Chang Uk Ha ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Numerical Analysis ◽  
High Speed ◽  
Flow Characteristics ◽  
Complete Combustion ◽  
Swirl Chamber ◽  
High Speeds ◽  
Hole Area ◽  
High Speed Diesel ◽  
Harmful Emissions

In a swirl chamber type diesel engine, a strong swirl is produced inside the swirl chamber during the compression stroke. By spraying the fuel into this chamber and thus forming a good mixture, the engine can obtain excellent combustion even at high speeds. Therefore, swirl chamber type diesel engines are favorable for high-speed operations, and because they can produce high power from a small size, they are used often for small, high-speed diesel engine applications. In order to simultaneously realize a reduction in harmful emissions and improvement in fuel consumption of the swirl chamber type diesel engine, reduction of the mixture formation period and complete combustion must be pursued; an optimum combustion chamber to achieve these tasks must first be designed. In this experiment, the effects of the area and the angle of the passage hole, which are the primary design factors of the swirl chamber type diesel engine, on the engine’s turbulent flow will be investigated. Using the commercial numerical analysis program the passage hole area and angle will be varied to analyze the intake and compression stages.

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