7iacs And Solas Requirements
To reduce the risk of failure in older ships, IACS introduced new Unified Requirements to reduce the risk of progressive flooding in existing bulk carriers. To prevent progressive flooding due to sea water in No. 1 Hold, the corrugated transverse bulkhead between the first two cargo holds, and the double bottom in way of the first cargo hold had to comply with new strength requirements assuming that No. 1 cargo hold was flooded. A damage stability review had to be performed with No. 1 Hold...
5 Conclusions 1
Systematic model tests have been carried out on a trimaran hull equivalent to operating high speed catamaran and monohull ships. Resistance and wave pattern tests have been carried out separately on the main hull, on the outrigger and on the trimaran. Seakeeping tests have been also carried out on the main hull and on the trimaran for X L 0.5-1.5. The resistance results have been analysed by ITTC 57 model ship correlation. From the results of this experimental research program the following...
An Investigation Into Wave Induced Drift Forces And Motions Of Very Large
N. Ma1, T. Hirayama2 and K. Ishikawa1 'National Research Institute of Fisheries Engineering Ebidai, Hasaki, Kashima, Ibaraki, Japan department of Naval Architecture and Ocean Engineering Yokohama National University Tokiwadai 79-5, Hodogaya-ku, Yokohama, Japan 'Sumitomo Heavy Industries, Ltd., Yokosuka, Japan In this paper, the drift forces and motions of very large floating structures VLFS in head waves are investigated through numerical simulations and model experiments. Three dimensional...
A Study On Deck Wetness And Slamming Of Very Large Floating Structures
Hyunkyoung Shin1, Ho-Young Lee1, Choon-Gyu Lim,1 Jeom-Moon Kang2, Oi-Hyun Kim2 and 1 School of Transportation Systems Engineering, University of Ulsan, Ulsan, Korea Hyundai Heavy Industry Co. Ltd., Ulsan, Korea The length and breadth of a very large floating structure VLFS are determined by airplane types and airport facilities in the initial design stage. However, its depth is dependent on hydroelastic behaviors such as vertical responses as well as buoyancy. Generally speaking, VLFS of the...
060
The results of this research are valid only for the examined hull forms. Further research will show if the obtained results are applicable to other trimaran hull forms. This work was supported by the Italian Ministry of University and Scientific Research in the frame of the 1999-2001 research plan. Ackers B.B., Micheal T.J., Tredennick O.W., Landen H.C., Miller E.R., Sodowsky J.P., Hadler J.B. 1997 . An investigation of the Resistance Characteristics, of Powered Trimaran Side-Hull. SNAME Trans....
4 Discussion Of Results
Table 2 shows the analysis result for a 300K VLCC which uses similar ship and same trial data with the example results of ISO DIS 15016. All of these calculation results of resistance increase due to the disturbances and the deviations give good agreement with the calculation results taken from the example of ISO DIS 15016. Table 3 shows the comparison between the results of resistance increase due to waves by this program and of ISO DIS 15016 examples. The resistance increase due to ship...
4 Modelship Correlation
The main purpose of the investigation carried out testing two trimaran geosim models has been to have useful information on the model-ship correlation for this vessels at high speed. In order to verify the validity of the ITTC'57 correlation methodology, the analysis of the geosim models results was performed using the residuary resistance coefficients Cr calculated by the expressions Cr T Fn CT T Fn, Rn - CF T Rn 2 Cp T Cf M S M S t 2 Cf 0 S O S t 3 where the suffix code T, M, O are referred...
Probabilistic Analysis Tools For Surface Ships Under Seaway And Extreme Dynamic
'Applied Mechanics Department, Engineering amp Information Technology Group, Anteon Corporation 240 Oral School Road, Mystic, CT 06355-1208, USA Survivability, Structures, and Materials Directorate, Naval Surface Warfare Center Carderock Division, West Bethesda, MD 20817-5700, USA Two analysis tools, SIMLAB and PULSTR, have been developed for probabilistic vulnerability and reliability assessments of surface ships. These tools account for variability in material properties, geometric...
The Impact Load Of Wingingroundeffect Craft In Waves And Application Of Hydroski
Zu-Shun Dong, Xiao-Peng Gao and Wei Sun NAVAL UNIVERSITY OF ENGINEERING Wuhan, China Wing-in-ground-effect craft WIG has been accepted by more and more countries because of its high speed like an airplane but low cost as a ship, and also because of its outstanding performance of safety and concealment. However, some technical problems must be solved to get a large and practical WIG, first of all is the prediction and reduction of hydrodynamic impact load in rough sea. An effective method has...
yz JJM JGX y y 1
where G is Green's function. When a distance between the source and observation points becomes infinity, Green's functions in this study are 1 where eq. 2 is for shallow water depth, and eq. 3 is for deep water depth. Thus, the velocity potential at infinity field from the floating structure is expressed in the following equations, for shallow water Now, if Kochin function is defined as follows, for shallow water a final equation of the steady wave drifting force of a surge mode is obtained as...