Japan / Japon (116) unitwin/unesco chairs Programme Progress report Period of activity: 1 April 2000 – 31 March 2001 unesco chair in Naval Architecture and Ocean Engineering Report established by



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UNITWIN/UNESCO Chairs Programme

Progress report

Period of activity: 1 April 2000 31 March 2001

UNESCO Chair in Naval Architecture and Ocean Engineering

Report established by: Masahiko Fujikubo, Professor, Dr

* Chair holder has been changed to Prof. Masahiko Fujikubo from Prof. Tetsuya Yao who moved to Graduate School of Osaka University. In this connection, the contact person has been also changed from Prof. Masahiko Fujikubo to Prof. Eiji Shintaku. These will be reported to UNESCO by a separated mail enclosing a letter signed by President of Hiroshima University.

** Name of the Department has been changed since 1 April 2001 due to reorganization of the University

I. Activities

1.Education/Training/Research

Title of the course: Special Course for the Degree of Doctor of Engineering in Naval Architecture and Ocean Engineering

Aim of the course: To offer a three-year doctoral course that does not require Japanese language proficiency and a continuative retraining of the students who have finished the course by performing joint research projects or conferences. (The homepage of the special course in found in http://www.naoe.hiroshima-u.ac.jp/classesspecial.html

Expected results: To contribute to the international collaboration of advanced studies in naval architecture and ocean engineering between Hiroshima University and research institutions in developing countries

Duration: Three-year course commencing October of every year

Target groups

Nationals to which Japanese scholarships are offered

Foreigners who are staying outside Japan and having a Master degree in Engineering or equivalent research experience

Geographical coverage for partners and participants

Nationals to which Japanese scholarships are offered

Nationals and regions

Outputs

The number of doctoral students who are studying in the course or have finished it in the reported period is sixteen.

Five students have been awarded a degree of Doctor of Engineering in the reported period.

Publications in the reported period are given in Annex 4.

There is no output of multimedia material in the reported period.

2.Conferences/Congresses/Meetings

The public defense meetings for the doctoral candidates and the interim presentation meeting for the 2nd-year students were held in Hiroshima University.

3.Missions / Travels abroad

Professor Masahiko Fujikubo was invited to Huazhong University of Science and Technology, Wuhan, China, during 21-28 November 2000 by Prof. Yao Zhao, who was a student of the special doctoral course. The purpose of the visit is to give a lecture on the ultimate strength of ship structures and to exchange the research progresses in this field among Hiroshima University, Universities in Wuhan (Huazhong University of Science and Technology, and Wuhan University of Technology) and ship industries in Wuhan (Wuchang Shipyard Tecnnical Center). Chinese government, Wuhan City and Huazhong University of Science and Technology, covered the expenses.

II. Impact

The UNESCO Chair "Naval Architecture and Ocean Engineering" was established in Hiroshima University, Japan, in 1997, on the basis of the special course for a degree of doctor of engineering, a Japanese government scholarship program for foreign students. The course has already had students from various countries such as China, Korea, Vietnam, Egypt, Iran, Indonesia, India, Poland, Bulgaria and Rumania etc. So far, almost all the participants have successfully received a degree of doctor of engineering after their three-year hard work. Most of them returned to their countries and are contributing to the development of naval architecture and ocean engineering as university researchers and engineers.

The technical exchange between Hiroshima University and the research institutions in developing countries involved in this chair, and the continuative retraining of the students who have finished the course have been also performed on individual levels.

It is believed that these activities contribute to the advance in the marine technology and ocean safety worldwide and to the development of the highly educated researchers in the developing countries.



III. Forthcoming activities

The Romanian-Japanese Conference in Numerical Simulation in Engineering will be held in Galati University, Romania, 17-23 September 2001. Prof. Adrian Lung (Galati University) who graduated from the special doctoral course is a promotor of the conference. His previous achademic superviser, Prof. Kazuhiro Mori, Department of Social and Environmental Engineering, Hiroshima University, is a member of scientific committee and will join the conference. Some professors in the same department will also join the conference.

Professor Huang Yi, Dalian University of Technology, China, who graduated from the special doctoral course, will stay at Graduate School for International Development and Co-operation, Hiroshima University, from April 1, 2001 to September 30, 2001, for the purpose of Joint Research and Educational Exchange. The expenses will be covered by Ministry of Education, Culture, Sports, Science and Technology, Japan.

The department of Naval Architecture, Ocean Engineering and Engineering Systems, Faculty of Engineering, Hiroshima University has been reorganized as the Department of Social and Environmental Engineering, Graduate School of Engineering, Hiroshima University. Accordingly, The brochures and home pages of the Special Course/UNESCO Chair will be updated in the next period, and the former will be distributed to many countries including those that have never sent students to this course.



IV. Development prospects

The department of Naval Architecture, Ocean Engineering and Engineering Systems has been reorganized as the Department of Social and Environmental Engineering. The new department covers wider area including Coastal and Oceanographic Engineering, Ocean-Atmosphere Environment, Logistics Systems and so on, all of which are quite important research area from the vewpoints of both economics and sustainable development of the world.

The name of the course, Naval Architecture and Ocean Engineering, will be unchanged for the time being, but its area will be significantly extended. It is also expected that the number of participating universities and countries will increase. We are going to make further efforts to inform the presense and significance of the Special Course/UNESCO Chair as widely as possible.

Target groups

Graduate students

Academics

Employees from industry, and

Teachers from technical education

who are staying outside Japan and having a Master degree in Engineering or equivalent research experience



Geographical Coverage

The course is opened for all countries to which Japanese scholarships can be offered. The nationals and regions, from which the course has ever accepted the doctoral students, are as follows:

 

Regional

Africa


Arab States

Asia/Pacific

Eastern and Central Europe

Western Europe and North America



International

Austria


Bulgaria

China


Egypt

Germany

Korea

Vietnam


India

Iran


Indonesia

Poland


Rumania

Outputs

Publications

Title of activity: Technical paper for journals

(Note: The name of the students of special doctoral course is underlined.)

Title: Numerical Investigation on Propulsion by Undulating Plate

Author(s): Doi, Y. and Chen, Z. (Korea)

Name of Journal: Journal of the Society of naval Architects of Japan

Publisher(s): The Society of Naval Architects of Japan

Year: 2000

Number of pages: 8

Type of document/material:

Periodical

Language(s): English

Main keywords : Unsteady viscous flow, undulating plate, Numerical Simulation, micro-hydro-machine.

SHORT ABSTRACT

Unsteady viscous flow field around an undulating advancing plate in low Reynolds number range is numerically studied. The main objective is to study the abilities of an undulating plate to produce thrust and achieve higher propulsive efficiency in low Reynolds number range. The Reynolds number based on the oncoming velocity and the plate length is 1000. The flow around an undulating plate is simulated by solving the full 3D unsteady Navier-Stokes equation in a primitive value formulation. The numerical scheme is based on the MAC method where the Navier-Stokes equation is solved by the time marching method on a body fitted coordinate system.

The simulation shows that pressure is acting as thrusting force while frictional force is acting as resistance during the undulating motion. Strouhal number is the most important governing parameter for the propulsive efficiency. The propulsive efficiency is enhanced with the increase of the Reynolds number. The advancing thrust mainly comes from the aft part of the plate and the modification of the plate shape can improve the propulsive efficiency. The present study is expected to be applied for the development of a propulsor for micro-hydro-machine.

Title: Influence of the Fully Nonlinear Steady Wave Field on the Unsteady Wave Field of a Blunt Ship Advancing in Waves

Author(s): Nechita, M. (Romania), Iwashita, H., Iwasa, H., Hidaka, Y. Ohara, H

Name of Journal: Transactions of the West-Japan Society of Naval Architects

Publisher(s): The West-Japan Society of Naval Architects

Year: 2000

Number of pages: 12

Type of document/material:

Periodical

Language(s): English

Main keywords: Ship hydrodynamics, Nonlinear steady wave field, Numerical Simulation, Rankine panel method

SHORT ABSTRACT

The effect of the steady wave field on the unsteady wave field is numerically studied utilizing a desingularized Rankine panel method for a blunt ship. The steady problem is solved so that the fully nonlinear free-surface condition is satisfied numerically.

The unsteady problem is solved taking account of the influence of fully nonlinear steady wave field through the free surface and body boundary conditions. The results obtained for a Series-60 ($C_b=0.8$) are compared with experiments, the strip method, the Green function method and a linear Rankine panel method based on the double-body formulation.

Finally the performance of the present Rankine panel method is discussed on the prediction of hydrodynamic forces and the wave field.

Title: Estimation of Ultimate Strength of Ship Bottom Plating under Combined Biaxial Thrust and Lateral Pressure

Author(s): Fujikubo, M., Yao, T. and Khedmati M.R. (Iran)

Name of Journal: Transactions of the West-Japan Society of Naval Architects

Publisher(s): The West-Japan Society of Naval Architects

Year: 2000

Number of pages: 10

Type of document/material:

Periodical

Language(s): English

Main keywords: Ultimate strength, Ship bottom plating, Thrust, Pressure, Simple design formula



SHORT ABSTRACT

The simplified method of estimation of the ultimate strength of ship bottom plating under combined transverse thrust and lateral pressure proposed by the authors is extended to the case of combined longitudinal thrust and lateral pressure. A series of elastoplastic large deflection FEM analyses is performed to clarify the influence of lateral pressure on the ultimate strength of a continuous plate. Based on the obtained results, a set of formulae has been derived for the estimation of the ultimate strength. Two fundamental collapse modes are considered; i.e. simply-supported mode and clamped mode. The ultimate strength is estimated taking the lower strength between those obtained for two assumed collapse modes.

The derived formulae for estimation of the ultimate strength under combined transverse thrust and lateral pressure, and under combined longitudinal thrust and lateral pressure, are further extended to the case of combined biaxial thrust and lateral pressure. It is seen that the predicted strengths are in good agreement with the FEM results.

Title: ISUM Rectangular Plate Element with New Lateral Shape Functions (1st Report) -Longitudinal and Transverse Thrust-

Author(s): Fujikubo, M., Kaeding, P. (Germany) and Yao, T.

Name of Journal: Journal of the Society of naval Architects of Japan

Publisher(s): Society of Naval Architects of Japan

Year: 2000

Number of pages: 11

Type of document/material:

Periodical

Language(s): English

Main keywords: Idealised Structural Unit Method, Rectangular plate, Ultimate Strength, Finite Element Method, Shape function

SHORT ABSTRACT

New shape functions for the lateral deflection of rectangular plate elements for the Idealised Structural Unit Method (ISUM) are developed. First, the collapse behaviour of rectangular plates under longitudinal and transverse thrust is studied by elastoplastic large deflection FEM and the characteristics of the collapse modes are highlighted. Based on these characteristic deflection modes, new lateral shape functions for the large ISUM elements are assumed and implemented. Comparisons with FEM results show the applicability and good accuracy of these new ISUM elements. The importance of shape functions simulating the collapse mode accurately is demonstrated by comparing the new formulation with a previous one and by examining the influence of two yield functions.



The full version of report provides information on another 8 articles published by the Chair.


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