MINISTRY OF EDUCATION & TRAINING - MINISTRY OF TRANSPORT
HO CHI MINH CITY UNIVERSITY OF TRANSPORT
NGUYEN THI NGOC HOA
RESEARCH ON A PROPOSED HULL FORM OF THE
CONTAINER SHIP SUITABLE FOR VIETNAM RIVER-SEA
ROUTE
Major: Transport Mechanical Engineering
Code: 9520116
PH.D THESIS SUMMARY
HO CHI MINH - 2021
The Thesis was completed at Ho Chi Minh City University of Transport
Science supervisor 1: Assoc. Prof. Vu Ngoc Bich
Science supervisor 2: Assoc. Prof. Le Tat Hien
Independent Reviewer 1:
Independent Reviewer 2:
Reviewer 1:
Reviewer 2:
Reviewer 3:
The thesis will be defended before the Thesis Evaluation Council meets at
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at hours day month year
Thesis can be found at the library
- Library of Ho Chi Minh City University of Transport
INTRODUCTION
1. Motivation
According to data from the Department of Inland Waterways in 2019,
Vietnam's waterways transport industry reached 250 million tons/year. In which
coastal transport accounted for more than 60 million tons/year, promoting the
shipping industry and economic integration between regions, making the most of
Vietnam's natural coastal conditions. The issue of efficient energy use for ships
is urgent because of fuel-saving in ship operation and the mandatory
requirements of the Marine Environment Protection Committee (MEPC) of the
International Maritime Organization (IMO) to reduce environmental pollution
global and greenhouse gas emissions. For ships operating on the coastal route
(both at sea and in inland waters), although they are not subject to the application
of the above regulations of IMO, it is also necessary to satisfy the rules,
resolutions, and laws of Vietnam on the intended use of energy-efficient and
economical. Therefore, researching solutions to design vessels to improve energy
efficiency is critical for Vietnam's international fleet of ships in general and the
whole coaster fleet in particular.
In Vietnam, in July 2014, after a period of preparation, the Ministry of
Transport officially announced the opening of three coastal transport routes. It is
forecasted that the number of river-sea route ships will continue to increase
because the Viet Nam Register Agency is evaluating many new registration
documents in the coming time. However, according to the evaluation, in the
design of river-sea route ships in general and container ships running the river-
sea route, there are still many problems, such as the optimization of the hull form
has not been enough attention. Until now, there is no standard container hull form
suitable for Vietnam's waterways. Therefore, the development of an algorithm to
propose the hull form and implement a mathematical model of the whole ship in
general and the container ship running on a river-sea route in particular, taking
into account the influence of the channel route, which is highly scientific and
practical. As a result, it enriches relevant national and international studies in the
field of ship design. Therefore, with the consent of the instructor, the author chose
the topic "Research on a proposed hull form of the container ship suitable for
Vietnam river-sea route."
2. Research objective
In this thesis, we propose a mathematical model to improve the hull form of
a container ship in the preliminary design stage, aiming to reduce the ship's
resistance concerning constraints of Vietnam's river-sea route
3. Research subject and scope
• Research subject: Container ship operating in the area affected by the
river-sea route
• Research scope: Propose a hull form optimization algorithm based on
the resistance objective function and propose a NUBS mathematical function for
the container ships less than 5000 tons, popularly operating in the river-sea route
of the southern region.
4. Methodologies
This thesis uses design theory methods and numerical analysis tools as
follows:
• Theoretical research: General methodologies in ship design, numerical
integration, and hull form variation
• Computational modeling research: Genetic Algorithm (GA) and Non-
Uniform B-spline (NUBS) mathematical functions for ship's hull form.
• Applied research: Evaluate hull form quality based on smooth,
continuous characteristics and computational simulation by using the ship design
program.
5. Scientific, practical significance and new contribution
• Scientific significance: This work is the first step in integrating
computer-aided ship design into intensive research directions in the further field
of fluid mechanics and solid mechanics.
• Practical significance:
- Support designer to explore and choose a concept design to propose the
container ship hull suitable for different route conditions in Vietnam.
- This work is also a valuable reference for training in schools and the
research topics in ship design.
• New contributions of the thesis:
- The thesis has synthesized, analyzed, and selected a method of
calculating ship resistance with acceptable reliability in the preliminary
design stage, which the design consultants have not had the conditions
to analyze.
- The thesis has successfully implemented the Genetic Algorithm in
Matlab, which proposes the hull form coefficients and longitudinal
center of buoyancy suitable for container ships considering the influence
of river-sea depth. The results obtained are entirely reliable.
- The thesis has successfully proposed a mathematical model for the
optimized ship hull form in the NUBS algorithm. NUBS function is an
efficient and highly applicable geometrical model in the preliminary
design and engineering design stages and can serve numerical analysis
in intensive studies.
- The proposed algorithm can be used as an assistant tool to suggest
suitable ship hull forms; also, it can be a potential commercial software.
This work aims to propose a more appropriate container ship hull form
considering the influence of the depth of route. The Genetic Algorithm is
implemented to reduce drag and fuel-saving, then the mathematical model of the
container ship is proposed, as shown in the following flowchart.