P1995-8
Symposium on Wave Generation, Analysis and
Related Problems in Experimental Tanks
especially on directional vv^aves
-Yokohama National University
25 September 1995
TECHNISCHE UNfiVERSITEIT Laboratorium voor Scheepshydromechanlca Archief Mekelweg 2; 2628 CO Oelft TeL-016-786873 « Rdq 015<>781838Wave Generation'95
Yokohama, Japan
TABLE OF CONTENTS
Preface iv
Organizers v
Photographs of Facilities vii
List o f Papers xiii
Papers 1
Abstracts (in Japanese) 195
PREFACE
Recently much progresses can be seen about the ocean wave
generation and related techniques i n experimental tanks or basins. I n
those techniques, common problems exist for either naval architecture
or civil engineering field, so i t w i l l be fi-uitful to exchange knowledge
and opinions each other.
Considering such situation, members of both group of ITTC SKC*
and Work Shop on E A D W M * * planned to hold a symposium about
wave generation on the occasion that ITTC SKC is held i n Yokohama
National University.
We hope that this symposium w i l l accelerate the progress of ocean
wave generation .analysis and appHcation techniques i n experimental
tanks or basins i n naval architecture , civil engineering and related
field.
Tsugukiyo H I R A Y A M A Yasumasa S U Z U K I
Representative of the Organizing Committee
Sea Keeping Committee of International Towing Tank Conference
Work Shop for Engineering Application of Directional Wave Maker
Organizing Committee
rrol". Tsugukiyo Hirayama (Yokohama N a t i o n a l University) Dr. Yasumasa SuzukiProf. Shigeru Naito Dr, Tetsuya H i r a i s h i Prof N i n g M a *
(Port and Harbour Research Institute) (Osaka University)
(Port and Harbour Research Institute) (Yokohama National University) * Secretary
Organizers
21st ITTC Seakeeping Committee:
Dr. Raymond Cointe (Bassin d' Essais des C a r è n e s , France) Prof Alberto Francescutto** (University of Trieste, Italy)
Prof Tsugukiyo Hirayama (Yokohama N a t i o n a l University, Japan)
Dr, Roumen l ü s h e v (Bulgarian Ship Hydi-odynamics Centre, Bulgaria) M r s . K a t h r y n McCreight (David Taylor Model Basin, U.S.A.)
Prof Shigeru N a i t o (Osaka University, Japan)
Prof Olle G.A. Rutgersson (Royal Institute of Technology. Sweden) Dr. Deuk-Joon Y u m (Hyundai Heavy Industries Co,, L t d . , Korea)
Ir. S,G. Tan* ( M a r i t i m e Research I n s t i t u t e Netherlands, The Netherlands)
*Chairman **Secretary
Workshop for Engineering Application of Directional Wave Maker:
Dr. Yasumasa Suzuki (Port and Harbour Research Institute, Japan) Dr. Tetsuya Hii-aishi (Port and Harbour Research Institute, Japan)
Sponsor
Japan M a r i n e Dynamics Committee, Society of N a v a l Aichitects of Japan
Photo 1 Directional waves generated in the towing tank (L=100m, B=8m, d=3.5m) of
Yokohama National University by individually controlled plunger type (24
segments) wave generator.
Photo 2 Short-crested waves are generated in the Marine Dynamics Basin (L=60m, B=25m, d=3.2m) of the National Research Institute of Fisheries
Engineering. The 80-segment plunger-type wave maker installed at the end
Photo 3 Deep Water Offshore Stixicture Experimental Basin of Port and Harbour
Research Institute, IVlinistry of Transport. (Since 1984, several series of
model tests in directional seas have been carried out. Basin 35m x 27m, Generator 80cm x 35 paddles (piston type) )
Photo 4 Oblique waves generated by C-shaped wave makers of Taisei Corporation. C-shaped wave makers are controlled by a new non-reflected wave maker theory. The wave makers seen at the right front side in the photograph are absorbing the oblique waves, and the wave field is not disturbed by the reflected waves from the wave makers. The wave heights along the wave crests are spatially uniform and the crest lines of the waves are straight.
Photo 5 Short-crested wave generation by directional wave maker of Central Res. Inst, of Electric Power Ind.
X
Photo 6 A wave generated by a multi-unit wavemaker in the towing tank o f Ishikawajima-Harima Hea^y Industries Co.,
Ltd.
Photo 7 The photograph is a scene of the dry test of the multi-directional wave maker, viz., snake-type wave maker, in the Seakeeping Basin of Nagasaki Research and Development Center, Mitsubishi Heavy Industries, Ltd
Photo 8 Department of Civil Engineering, Chuo University. The basin is 10.5 m wide, 6.8 m long, and 0.6 m depth. The multi-directional wave maker consists of 28 piston-type wave paddles continuously linked or 29 sets of actuator rod. Each paddle is 30 cm wide and 50 cm high.
Photo 9 Synchronized 40 pistons and generated regular waves which have straight wave crest line are found. This is the link type wave generator in
Penta-Ocean Construction Institute of Technology ( Number of pistons : 40,
Number of paddles : 39, Maximum wave height: 40 cm Wave period : 0.5-2.5 sec)
Photo 1Ü Upper: Directional spectrum waves in a towing tank
Lower: Yacht model on an One Point Concentrated Transient Water Wave
(Yokohama National University)
DIMENSIONS
S S
100 m X 24.5 m. 1. Workshop 2. Working pond 3. eeac/7 4. Carriage 5. Sub-carriage 6. Auxiliary carriage 7. Wave generator 8. Wire mesh package 9. Wave generator motor 10. Support piles 11. Rails12. Pit (4.5 X 4 . 5 m , depth 3.5 m belov^ basin bottom)
Regular and irregular waves. Wave period 0.7 - 3 s.
Wave direction 180 - 270 and 0 - 90 deg. and any angle in between.
Vis- 3. Wni-c sciiemfor with a l>base Jiffereiice of 120°. Wave length
1.70 m
Fig. 13. Crois section of the wave generator
Fig. 16. General arrangement of the platform alongsi.le the aJjiisling-•liscs. Irregular nates
Photo 11 Generated regular and irregular oblique waves (1956) in the seakeeping basin o f NSMB (now Maritime Research Institute Netherlands Fi.^•. ) . Ware gener.i/or uiih a phase difference of 40°. Wave length (MARIN). Quoted from International Shipbuilding
Progress Vol.4 No.29 (1957))
