MINISTRY OF EDUCATION
AND TRAINING
VIETNAM ACADEMY
OF SCIENCE AND TECHNOLOGY
GRADUATE UNIVERSITY SCIENCE AND TECHNOLOGY
----------------------------
Nguyen Van Hai
RESEARCH ON THE MECHANICAL MODEL AND
CALCULATING DESIGN OF AN ELECTRICAL
GENERATOR FOR SEA WAVE ENERGY
Major: Engineering Mechanics
Code: 9 52 01 01
SUMMARY OF MECHANICAL ENGINEERING AND
ENGINEERING MECHANICS DOCTORAL THESIS
HANOI – 2019
The thesis has been completed at: Graduate University of Science
and Technology - Vietnam Academy of Science and Technology
Supervisor: Prof. DrSc. Nguyen Dong Anh
Reviewer 1:
Reviewer 2:
Reviewer 3:
Thesis is defended at Graduate University of Science and
Technology
- Vietnam Academy of Science and Technology at…, on
date…month…2019.
Hardcopy of the thesis be found at:
- Library of Graduate University of Science and Technology
- Vietnam National Library
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INTRODUCTION
1. Reasons for choosing the topic
According to calculations by scientists, the received energy from
fossil fuels will become gradually exhausted, and now therefore
looking for new energy sources is requisite. For Vietnam, the 2020
target is to become a country in which marine economics will
constitute over 50% of GDP. Therefore, the energy demand
supplying for general economics and particular marine economics is
very important. The research and fabrication of electrical generators
for sea wave energy are necessary. Moreover, the electrical energy
received from sea wave energy conversion is friendly to
environment, almost endless and is a clean energy source. The sea
wave energy is an important energy source of the world as well as
Vietnam in the future.
In addition, Vietnam has the advantage of being a country with a
coastline stretching over 3260 km, with more than 3000 islands and
over one million km2 of sea surface, it indicates that the energy
source from the sea is huge. In order to exploit the vast energy
resources of the sea, the author proposes a research of thesis of
building a device model to convert from sea wave energy to
electricity.
2. Objective of the thesis
For the purpose of building a model of electrical generator for
sea wave energy, the device operates efficient and in suitable to
Vietnam's sea condition; Determining the optimal damping
coefficient of the generating motor, model parameters to received the
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maximum output power; Design, fabrication of the electrical
generator with the output voltages are 12 VDC, 220 VAC frequency
50 Hz and pure sine wave.
3. Research method
The thesis uses analytical method, combining of the numerical
simulation and experiment for calculation, being specifically
described as follows:
- Determining the optimal damping coefficient of the generating
motor and model parameters by the analytical method.
- Using fourth-order Runge-Kutta and Simpson methods in
numerical simulation calculations, to determine the output power of
the device received from the sea wave energy and survey the device's
operation according to the sea wave conditions.
- Calculation, design, fabrication and experiment of the electrical
generator operates in sea.
4. Scientific and practical significance
- The thesis brings the electrical generator model for sea wave
energy, with the process of making the electrical generator device
from research to fabrication, the device operates effectively and
suitable to the actual conditions of Vietnam sea.
- The electrical generator can be used for signal buoys of seaway
and can supply the electrical power for lighthouses.
5. Structure of the thesis
The contents of the thesis include the introduction, 4 chapters,
the conclusion and proposition.
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CHAPTER 1. OVERVIEW OF RESEARCHES ON THE
ELECTRICAL GENERATOR FOR SEA WAVE ENERGY
AND APPLICABILITY IN VIETNAM
1.1. Overview of researches on the electrical generator in the
world
In the world, the research and fabrication of the electrical
generator devices for sea wave energy source have been considered
for a long time. The received electrical energy source for wave
energy conversion has met some demands of society. Up to now,
the electrical generators from sea wave energy have been
investigated and fabricated in many countries, for example,
Britain, Canada, Denmark, France, Ireland, Japan, Norway, Spain,
Sweden, South Korea, the United States,… The models are
researched in various forms such as the on-shore device, the device
fixed on the bottom of the sea, and the floating device on the sea
surface [1-19].
The analyses of models show that the electrical generator devices
have been researched and fabricated in many ways. In device
models, the generating motor is designed to operate in a rotational
motion or in a vertical up-down motion. Each device has different
advantages and disadvantages, depending on the fabrication
capabilities of each unit so that the research and fabrication devices
operate effectively and suitable to the actual use.
1.2. Overview of researches on the electrical generator in
Vietnam
In Vietnam, several research institutions have fabricated
electrical generators for sea wave energy. At National Research