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DESIGN OF ELECTRIC PROPULSION SYSTEM OF A SELF PROPELLED BARGE

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 Format: MS WORD ::   Chapters: 1-5 ::   Pages: 60 ::   Attributes: design and experiement ::   5 people found this useful
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CHAPTER ONE

INTRODUCTION

1.1 BACKGROUND OF THE STUDY

Mechanical propulsion drives has been in use and possibly dominated the naval surface ship propulsion for the past half-century. The ability to use the same prime mover to provide all of the ship’s power needs will reduce the number of installed prime movers and their associated equipment. This will unlock the propulsion power for other uses and help reduce maintenance, and manning costs throughout a ship’s lifecycle.

As the modern vessels have become more complex comprising an increasing number of heterogeneous interdependent subsystems. This increased complexity requires new methods for the design and operation of these marine systems.

According to Woud (2002), the electrical propulsion systems has the feathers of decentralization and complexity, successful development of marine electrical propulsion system requires a true system design philosophy in the engineering approach. One of the most important considerations in a new ship design is the method of propulsion to be used. By using electric motor for propulsion, ship builders will no longer be constrained by the placement of an in-line reduction gear and shaft placement.

With proper motor selection, electric propulsion systems can eliminate the need for a reduction gear and significantly reduce the length of the shaft or eliminate it altogether (ADNANES, 2003).

Electric propulsion systems has been used for ship propulsion for more than 100 years but with the advancement of power electronics, it was discovered that electric propulsion systems are cost competitive when compared to conventional mechanical propulsion ones (ADNANES, 2003). The electrical propulsion system offers several technologies and arrangements. The selection of elements for a particular ship depends on the total power range, commercial availability, the state of art and the specific conditions. In an electric propulsion system the most common components are the following:

Prime Mover: A prime mover is a machine that converts energy into work and examples of such machines are the gas turbine, steam turbine, reciprocating internal combustion engine, and hydraulic turbine. These machines may be used for turning a generator to produce electricity or may be used to drive another machine such as a compressor or a pump. The gas turbine, steam turbine, and reciprocating internal combustion engine are all heat engines, that is, convert thermal energy into work while the hydraulic and the wind turbines convert the available kinetic energy in the fluid into work.

Generator: Wound rotor or permanent magnet synchronous generator.

Transmission System: Alternate current (AC) or direct current (DC) at low voltage level.

Electric Propulsion Drives: Variable frequency drive (VFD).

Electric Motor for Propulsion: Wound rotor or permanent magnet synchronous motor, and induction motor

Main Propulsion and Thruster Units: Azimuth thruster with fixed pitch propeller, cycloid AL PROPELLER, tunnel thruster and integrated motor propeller. Each of the previous components can be set in operation along with any other component, forming several electric propulsion arrangements.

In order to select an electric propulsion system for a vessel, various alternatives of arrangements are proposed to compare their characteristics. The most common alternatives for medium size/medium power vessels (in order from 1 to 10~12MW) are the electric propulsion systems with AC transmission and synchronous or induction motors as main propulsion motors.

1.2 STATEMENT OF THE PROBLEM

Over the years technological knowledge has been on great increase and due to the dynamic state of technology, new and improved systems have been developed to improve on the previous ones. Mechanically propelled ship vessels have been discovered to be uneconomical in its operation since it uses many prime movers as compared to the electric ship vessels which could use a single prime mover to satisfy all the ship power needs.

1.3 AIMS AND OBJECTIVES OF THE STUDY: The aim of this study is to design a suitable electrical propulsion system as a replacement of the common mechanical propulsion systems used in ships. This study would be undertaken under the following objectives;

  • Discussion and analysis of the main component of the electric propulsion system.
  • Estimation of a typical operational profile and load profile for a ship
  • Proposal and sizing of four electric propulsion alternatives: two arrangements with conventional electric propulsion systems and two arrangements with conventional electric propulsion systems and two arrangements with batteries bank as a relative new implementation in a ship. Each alternative considering medium and high speed diesel generator set.
    1. SCOPE AND LIMITATION OF THE STUDY

 

1.5 SIGNIFICANCE OF THE STUDY

This study will be of great importance in the following ways;

  • It will provide adequate information relating to the design of electric propulsion systems.
  • It will also enlighten the general public concerning the advantage of the new trend of technology.
  • It will form a basis for other researchers to work on.

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Project Information

Format:MS WORD
Chapter:1-5
Pages:60
Attribute:design and experiement
Price:₦3,000
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