8/4/2019 Simulation of Marine Diesel Engine Propulsion System Dynamics During Extreme Maneuvering

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1 Copyright 2006 by ASME

Proceedings of ICE62006 Spring Conference of the ASME Internal Combustion Engine Division

May 7-10, 2006, Aachen, Germany

ICES2006-1366

SIMULATION OF MARINE DIESEL ENGINE PROPULSION SYSTEM DYNAMICSDURING EXTREME MANEUVERING

George A. Livanos George N. Simotas George G. Dimopoulos Nikolaos P. Kyrtatos

Laboratory of Marine Engineering, School of Naval and Marine EngineeringNational Technical University of Athens

9, Iroon Polytechniou st., Zografos, GR-15710, Athens, Greece

Phone: +30 210 7721119, Fax: +30 210 7721120E-mail: nkyrt@naval.ntua.gr

ABSTRACT

The dynamic behavior of a typical four-stroke, medium-

speed, marine diesel engine driving a Controllable Pitch

Propeller (CPP) is investigated during ship maneuvering

including fast propeller pitch changes. A modular model has

been developed in Simulink/Matlab for the simulation of the

dynamics of ship propulsion. The developed model considers

the ship propulsion system as a set of three main modules: the

engine, the propeller and the ship hull.The developed ship propulsion dynamics model has been

validated with a wide range of experimental data from a 500

kW test engine (MAN B&W 5L16/24), coupled to a four

quadrant electric brake (AEG), installed at the test-bed of the

Laboratory of Marine Engineering of the National Technical

University of Athens (NTUA/LME).

The model was then used for the investigation of marine

diesel engine behavior during load changing including some

extreme maneuvering case scenarios such as Crash Stop, Full

Astern and Full Ahead maneuvers.

The resulting ship propulsion model is a reduced order

model, which can easily be used for detailed studies such as

engine control during fast transient loadings, with accuracy andsmall computational cost.

INTRODUCTION

Four-stroke marine propulsion diesel engines are

frequently coupled with Controllable Pitch Propellers (CPP) for

increased maneuvering capabilities and proper matching of

load in all ship operating conditions. During the maneuvering,

the ship has to comply with international navigation standards

and moreover the main engine has also to comply with the

manufacturer specifications and limits.

The ship propulsion system response during extreme

maneuvering (corresponding to rapid propeller pitch changes)

is traditionally assessed with full scale ship trials. In this

context, the development of cost effective simulation tools is

attractive.

A detailed simulation study of a slow speed diesel engine

performance during ship maneuvers in the case of a fixed pitchpropeller direct-drive configuration was performed by Kyrtatos

et al. [1]. In this simulation work, the process thermodynamic

code MoTher (Motor Thermodynamics) was used and the

engine response was adequately predicted. Recently, Campora

et al. [2] performed numerical simulation of ship propulsion

transients using a model developed in Simulink/Matlab

software environment, including sub-models for cylinders, inlet

and exhaust gas plenums, compressor and turbine in the model.

In the case of a ship propulsion plant consisting of a four

stroke engine connected to a controllable pitch propeller, the

transient phenomenon duration is much longer in comparison

with the transient operation of an engine coupled to generator

since the ship inertia is much higher than generator inertiaThus, increased simulation time is required for the complete

transient response study. The objective of the work presented in

this paper, is the development of a reduced order model capable

of performing simulations with less computational cost than the

detailed thermodynamic tools. In contrast to detailed models

the reduced ship propulsion model can easily be used for

engine control studies due to reduced computational cost and

simpler structure.

Proceedings of ICES2006ASME Internal Combustion Engine Division 2006 Spring Technical Conference

May 8-10, 2006, Aachen, Germany

ICES2006-1366