Dynamics of a Marine Propulsion System With a Diesel Engine and a Propeller Subject To Waves

2015 ◽  
Author(s):  
Bhushan Taskar ◽  
Kevin Koosup Yum ◽  
Eilif Pedersen ◽  
Sverre Steen
Keyword(s):  
Diesel Engine ◽  
Fuel Efficiency ◽  
Propulsion System ◽  
Factors Affecting ◽  
Propulsion Performance ◽  
Marine Propulsion ◽  
Important Interaction ◽  
Ship Operation ◽  
Marine Propulsion System ◽  
Engine Power

When travelling in waves, the efficiency of the propulsion system is in most cases reduced, due to a variety of different effects. Traditionally, the performance of propeller and engine is analyzed separately. However, there might be important interaction effects, which this paper attempts to explore. Engine and propeller models have been coupled to obtain realistic response of the propulsion machinery and to observe the effect of interaction between engine and propeller. Experimental wake data have been used in the simulations. The effects of different factors affecting ship propulsion in waves have been noted and their effects have been calculated separately to analyze the influence of each of the factors on ship operation. A ship travelling in three different wavelengths of three different waveheights has been simulated. Influence of these waves on engine power and fuel efficiency has been studied. This paper is a step towards optimization of installed power through better prediction of sea margin with improved insights into the propulsion performance in waves.

Torsional Vibration Damping in a Marine Propulsion System Driven by a Two-Cycle Diesel Engine

2003 ◽  
Author(s):  
Felix Martinek
Keyword(s):  
Diesel Engine ◽  
Torsional Vibration ◽  
Vibration Damping ◽  
Propulsion System ◽  
Torsional Stiffness ◽  
Empirical Methods ◽  
Global System ◽  
Intermediate Shaft ◽  
Marine Propulsion ◽  
Marine Propulsion System

Torsional systems of marine propulsions are simulated by multiple inertias connected by linear springs and linear viscous absolute- and relative damping values. Absolute damping is acting between a global system without rotation and the rotating inertias of engine, propeller and auxiliary drive. Relative damping is acting in between inertias. Inertia and torsional stiffness is predicted by calculation and can easily be verified by measurements. Damping values are roughly estimated by various empirical methods. The measured vibratory stress of an intermediate shaft allows different damping identifications. Discrepancies in damping models for engines and propellers currently used will be presented. General numerical problems of various identifications will be shown as well.

scholarly journals Metamodels of a gas turbine powered marine propulsion system for simulation and diagnostic purposes

2015 ◽  
Vol 12 (1) ◽  
pp. 1-14 ◽  
Author(s):  
U. Campora ◽  
M. Capelli ◽  
C. Cravero ◽  
R. Zaccone
Keyword(s):  
Gas Turbine ◽  
Response Surfaces ◽  
Propulsion System ◽  
Direct Simulation ◽  
Analysis Method ◽  
Simulation Code ◽  
Marine Propulsion ◽  
Performance Reduction ◽  
Input Variables ◽  
Marine Propulsion System

The paper presents the application of artificial neural network for simulation and diagnostic purposes applied to a gas turbine powered marine propulsion plant. A simulation code for the propulsion system, developed by the authors, has been extended to take into account components degradation or malfunctioning with the addition of performance reduction coefficients. The above coefficients become input variables to the analysis method and define the system status at a given operating point. The simulator is used to generate databases needed to perform a variable selection analysis and to tune response surfaces for both direct (simulation) and inverse (diagnostic) purposes. The application of the methodology to the propulsion system of an existing frigate version demonstrate the potential of the approach.

THE DEVELOPMENT OF A LINEAR INDUCTION MOTOR AS A MARINE PROPULSION SYSTEM

2016 ◽  
Vol 158 (B1) ◽  
Author(s):  
M Geor ◽  
S Hooper ◽  
S Tamakai ◽  
A P R Taylor
Keyword(s):  
Induction Motor ◽  
Propulsion System ◽  
Secondary Reaction ◽  
Test Results ◽  
Linear Induction ◽  
Linear Induction Motor ◽  
Speed Test ◽  
Working Model ◽  
Marine Propulsion ◽  
Marine Propulsion System

The Linear Induction Motor (LIM) has been employed as an actuator in conveyers and more recently aircraft launches, and some work has been done on LIMs with a curved secondary reaction plate. This paper presents a working model of a marinised LIM-boat system, with underwater stator operating the hull of a boat which acts as reaction plate. The LIM stator is shown to propel the boat through the water, and that with certain reaction plate metals it will track over the stator coils and therefore be controllable in both direction and speed. Test results for differing coils and reaction plate combinations are provided.

scholarly journals Shaft power measurement for marine propulsion system based on magnetic resonances

2012 ◽  
Vol 9 (15) ◽  
pp. 1260-1265 ◽  
Author(s):  
Li Qin ◽  
Xincong Zhou ◽  
Yan Gao ◽  
Pengju Cao ◽  
Jianzhou Quan ◽  
...  
Keyword(s):  
Propulsion System ◽  
Power Measurement ◽  
Marine Propulsion ◽  
Shaft Power ◽  
Magnetic Resonances ◽  
Marine Propulsion System
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