9 Hybrid Hydrofoil Ferries

A high speed ferry is one obvious applications for the hybrid hydrofoil stepped hull concept. A ferry is a single speed vehicle, and the hybrid concept is well suited for this. Most practical new ferry routes in require a speed on the order of thirty to forty knots to compete with automobiles provided the speed can be achieved at an acceptable level of cost and reliability. This appears to be the optimum range for this concept, so a stepped hybrid may be able to achieve a lower cost and better...

Integration Of Firstprinciple Approaches To Design For Damage Survivability

' The Ship Stability Research Centre, Department of Ship and Marine Technology, University of Strathclyde, Glasgow, G1 1XN, UK The paper elaborates on the development of a procedure for accommodating damage survivability in the ship design process cost-effectively. For passenger Ro-Ro vessels, damage survivability considerations make sense only when adequate subdivision criteria have been satisfied whilst allowing for other design considerations. The paper highlights and demonstrates that a...

4 Renovation Of Existing Integrated Barge

Considering shipowner's assign condition and the restricting of the CHANGJIANG route, two kinds of 3000t and 5000t integrated barges are selected as investigation targets. As two kinds of barge were originally designed to navigate on the river route, the strength are unsuitable for the sea route. In order to navigate on the route of BEILUN to PAOTAIWAN(belonging to the shelter sea area), the shell and bottom structure of the 5000t barge must be replaced, that is too expensive for shipowner. For...

Comprehensive Fuzzy Approach In Hazard Identification Of Formal Safety Assessment

'China Classification Society 40 Dong Huang Cheng Gen Nan Jie. Beijing 100006, China Department of Machinery of Navigation College, Jimei University 205 Rome. 175 Shi Gu Load, Jimei, Xiamen. Fujian Province, China The paper presents an approach, which is used in hazard identification of Formal Safety Assessment (FSA) for ships, consisting of both fuzzy set theory application and database technology. An example of application concerned approach was given. This system will be applied to the...

Introduction

Ships are international commodities, which are freely sold and bought in the world. Ships are built in shipyards with the highest shipbuilding technology in the world and delivered to ship owners. Some ships are in service on the regular routes and others are in service on the irregular routes. Transportation fees are decided in accordance with the laws of supply and demand of ships in the world markets. In consequence all the prices, including those for ship building, running, maintenance and...

Isotc8

Eun-Chan Kim1, Hyun Se Yoon', Sa Young Hong1, Yoon-Rak Choi1 1 Korea Research Institute of Ships and Ocean Engineering, P. O. Box 23 Yusung, Taejon, 305-600, Korea The ISO Draft International Standard 15016, entitled Guidelines for the assessment of speed and performance by analysis of speed trial data, was developed by the working group ISOATC 8 SC 9 WG 2. This paper presents the structure of computer program based on the ISO DIS 15016. The computer program is constructed to optimize the...

Keywords

Maritime Safety Culture, Design Standards, Ship & Offshore installation 1 INTRODUCTION Since mid seventeenth century when class came into existence, classification societies have been making every effort to prevent safety at sea and marine environmental protection. With the development of scientific technology and ship & offshore installations design standards, new technologies have been woven into class rules. For the past half century, conventional technology has been challenged by...

3 Safety Culture And Development Of Ship And Offshore Installations Design Standards

As 1 have mentioned previously, safety chain promotes safety culture. Maritime safety culture can be defined as spirit of safety at sea and the associated systems, behaviors. The spirit of safety at sea means the objective of safeguarding of safety at sea and prevention of marine pollution. To pursue such an objective, all the partners involved in the safety chain take their own responsibilities in the context of safety culture. 3.2 Extension of implication of maritime safety culture Safety...

4 Foils

The use of the NASA GA(W)-1 is worth discussing further as we believe the use of this type of foil is another issue critical to the success of the concept. This section is one of a class of supercritical sections that are designed by computer to achieve maximum lift coefficient (above 2.0) with minimum possibility of stall. They achieve this by reducing the peak suction near the tip and filling in the suction aft, so that the total area of high suction is increased without severe peak. This is...

3 Hydromechanics

COMPUTATIONAL FLUID DYNAMICS - FLOW SIMULATION Simulation of Viscous Flow of Modern Surface Ships Using the FINFLO RANS Solver Tmg-Qiu Li and J. Matusiak Viscous Flow Around Rotating Ships C. Levi and J.B.V. Wanderley Numerical Simulation of Flows over Underwater Axisymmetric Bodies with Full Appendages Zhen-Yu Huang and Lian-Di Zhou Viscous Flow Calculations Used for Dredger Design M. Hoekstra, A. de Jager and H.H Valkhof Fully Non-linear Wave Computations for Arbitrary Floating Bodies Using...

Numerical Simulation Of Flows Over Underwater Axisymmetric Bodies With Full Appendages

Zhen-Yu Huang and Lian-Di Zhou China Ship Scientific Research Center, Wuxi 214082, China The numerical method based on flux-difference splitting LU decomposition, implicit high-resolution third-order Essentially Non-Oscillatory (ENO) schemes is constructed for efficient computations of steady-state solution to the three-dimensional, incompressible Navier-Stokes equations in curvilinear coordinates. The flowfields over underwater axisymmetric bodies with a fairwater and four stem appendages are...

Guo Jun Zhou

China Ship Scientific Research Center, Wuxi, Jiangsu, China ELSEVIER SCIENCE Ltd The Boulevard, Langford Lane Kidlington, Oxford 0X5 1GB, UK 2001 Elsevier Science Lid. All rights reserved. This work is protected under copyright by Elsevier Science, and the following terms and conditions apply to its use Single photocopies of single chapters may be made for personal use as allowed by national copyright laws. Permission of the Publisher and payment of a fee is required for all other photocopying,...

1 Introduction

Various hull forms have been proposed in recent years to satisfy the world trend for high speed maritime transportation, especially in the field of passenger vehicle ferries. The demand for fast sea transportation has led to a significant growth of interest in multi-hulled ships. An interesting possibility seems to be the trimaran, for a more convenient accommodation layout and for the increased stability also under damaged conditions. Besides, a trimaran configuration with the optimum position...

4 Concluding Remarks

Based on above analyses and results of the example some conclusions about CFD approach in the view of hull resistance performance can be drawn as follows The resistance performance can be appraised by the calculated results such as the distribution of pressure coefficient and the information of free surface elevation at any position. The separation of flow de dx 0) can be determined by the calculated information about the momentum thickness (& ) The results from model test and calculation...

CebbdbbhhbhmbkjoLI

Vir, mo M K-3JT-1 5L ' i 7 uejL V -I- t.- una n u (a)Selection of a structural members Figure 6 Recording process of the detected crack damage (1) A new concept of the information system for more advanced maintenance of ship structures is proposed. In the proposed system, the information about the damages is stored and managed in the database with the information of 3D ship hull structural model. A simple data model for the crack damage is proposed, and a prototype system is developed on...

3 Application

DSMT tanker model as an example of optimization process is provided as follows. The optimization of Level 2 has been made after Level 0 and . The bow and stern have been modified based on the parent ship, and four hull lines schcmes have been provided as follows Scheme 1 the parent ship of DSMT tanker Scheme 2 the DSMT tanker with modified bow (raising the center of gravity of bulbous bow) Scheme 3 the DSMT tanker with modified stem (increasing the value of alb) Scheme 4 the DSMT tanker with...

4 Study On The Optimum Buoyancylift Ratio

As the ship hull is lifted up above free-surface, the hull displacement is decreased, and hence, the hull resistance is also decreased. On the other hand, resistance of the hydrofoil system is increased as dynamic lift is increased. The sum of these two resistance components, that is, the sum of the hull resistance and the foil system resistance is the overall resistance for buoyancy lift combination ships. The overall resistance varies according to the buoyancy lift ratio. In general,...

W ab j 7 M0

Where y is wavelet function, a is the scaling parameter, and b is the transformation parameter, and * represents complex conjugate. It can be stated that CWT is the sum over all time of real signal s(t) multiplied by the scaled, shifted wavelet function. The parameters a and b vary continuously. The wavelet fiinction used in the present analysis is Morlet wavelet. The formulation of this wavelet function is show below y (O n ' 4 (e - e 2 )e 2 (2) The second term is added to satisfy the...

3 Correlation Of The Roughness And Drag

Townsin and Dey (1990) correlated the roughness and drag of a very wide range of coated surfaces and found that the resistance of smooth newly painted surfaces correlated well with the parameter Rt50. Their main argument for the use of a single height parameter to characterise the roughness was that the texture of a newly painted surface must depend principally on the rheology of the paint. There is no inservice damage which might affect the texture and only a height parameter is required to...

2 Building Cost

Building cost means total cost expended in a shipyard for building a ship. This is a part of life cycle cost and occupies a big amount. It is considered that building cost occupies about 2 3 of life cycle cost and maintenance cost occupies about 1 3. Table 1 shows the break down of the building cost of a VLCC with double hull. BULDING COST OF A VLCC WITH DOUBLE HULL BULDING COST OF A VLCC WITH DOUBLE HULL Material cost of a ship occupies a big amount and reaches to 50-60 of the total building...

New Production System For Vessels Of Composite Materials Using An Adjustable Mould

Jong Oh Kwon1, Jaesung Kim1, Jung Chun Suh1, Hyochul Kim1 Seung Hee Lee2, Young Gill Lee2, Kisung Kim2, Jae Wook Lee2 Jae Moon Lew3, Sanghong Lee , Jae Kyu Lee4, Dae Sun Kang5, Duk Soo Chung5 1 Department of Naval Architecture and Ocean Engineering, RIMSE Seoul National University , Seoul 151-742, Korea department of Naval Architecture and Ocean Engineering, Inha University 3Department of Naval Architecture and Ocean Engineering, Chungnam National University 4Design and Research Center,...

2 The Trimaran Model Configuration

The resistance model tests were carried out on trimaran ship design whose main characteristics are reported in Table 1. A round bilge transom stern displacement hull with high length to beam ratio was selected from series 64 as the main hull. Two different side hull forms were selected one was the well known Wigley mathematical form and the second one was derived by geometrical affinity from the series 64. Each outrigger hullform had length equal to one half of the main hull length and...

Mobile Agent Based Supply Chain Management In Shipbuilding Industry

Jing-Yun Cheng, Bei Lu and Sheng-Kun Zhang School of Naval Architecture and Ocean Engineering Shanghai Jiao Tong University Shanghai, 200030, China Now China shipbuilding industry faces the following serious problems low productivity and long construction period. In order to cope with it, a mobile agent based supply chain management solution is provided. Firstly, summarizes the related research of supply chain management and intelligent agent and their application in shipbuilding industry....

The Hybrid Hydrofoil Stepped Hull

Barry Fast Hulls, Inc., 3020 Daurine Ct, Gilroy, CA 95020 USA USCG ELC-024, 2401 Hawkins Pt. Rd. Baltimore MD 21226 USA Planing hybrid hydrofoils or partially hydrofoil supported planing boats are hydrofoils that intentionally operate in what would be the take off condition for normal hydrofoils. They offer a performance and cost that would be appropriate for some ferries, light cargo and recreational vessels. The stepped hybrid hydrofoil configuration made its...

Numerical Simulation Of Welding Distortions In Large Steel Structures

Section of Maritime Engineering, Department of Mechanical Engineering Technical University of Denmark DK-2800 Kgs. Lyngby, Denmark The scope of the present paper is to describe a technique which combines several methods to predict welding distortions in large-scale industrial welding applications. The template is established in three steps First, a general model is made allowing the essential welding mechanics to be captured in fillet welding. Subsequently, mesh grading techniques and dynamic...

Development Of A Sophisticated Hull Form Cad System Ezhull Based On A Nonmanifold Model And Xtopology

Kyu-Yeul Lee1, Joong-Hyun Rhim1, Sang-Uk Lee', Doo-Yeoun Cho1 and Young-Bok Choi2 'Department of Naval Architecture & Ocean Engineering and Research Institute of Marine System Engineering, Seoul National University, San 56-1, Shinlim-Dong, Kwanak-Gu, Seoul 2EzGRAPH, Co. Ltd., Rm 1201, Union Center, Yoksam-Dong, Kangnam-Ku, Seoul, Korea Hull design evolves from a wireframe model to a surface model through conceptual design, preliminary design, and production design. Hull form designers...

3theory For Impact Load In Waves

It's lucky that there are many research results of seaplane that is effective to be used as reference in WIG study. According to experience of seaplane, impact load is the most serious load that a WIG should sustain. Furthermore, it is the most serious situation when step of WIG hull impact on sea surface symmetrically. Von-Karman and Wagner's impact theory of wedge has been used in research of seaplane1'1. The main difference between WIG and seaplane is that WIG is required to sustain higher...

Simulation Study On Coastal Ecosystem Around A Very Large Floating Structure In Tokyo

Tabeta2 'Department of Environmental and Ocean Engineering, Graduate School of Engineering, University of Tokyo, Japan 'institute of Environmental Studies, Graduate School of Frontier Sciences, University of Tokyo, Japan To realize a very large floating structure (VLFS), it is indispensable to examine various effects of the VLFS on marine environment. For environmental impact assessment in physical, chemical, and biological aspect, numerical simulation by means...

3 Hull Form Design And Bare Hull Resistance Tests

Hull form design is one of the most important technologies in the shipbuilding industry. The authors, long engaged in this industry, have made much efforts to the research on the hull form design technology. As the result, several different theoretical methods have been prepared and published by the authors. As far as the authors' knowledge is concerned, no analytical optimum hull form design method practically exists in the world except the authors' works. Recently, the authors have developed...

4structures And Materials

Prediction of Wave-Induced Rolling Responses by a Time-domain Strip Theory 839 Zhao-Hui Wang, J.J. Jensen and Jin-Zhu Xia Methods to Reduce the Effects of Irregular Frequencies in Hydrodynamic Analysis of Vessels with 5.X. Du, D A. Hudson, W.G. Price and P. Temarel The Effects of Forward Speed on Hydrodynamic Pressure and Structural Response of Ships in Waves 857 Chih-Chung Fang, Hua-Tung Wu, Hoi-Sang Chan and Chung-Yung Lu Ship Motions and Sea Loads by a 3D Rankin Panel Method 865 Li Xu....

Research On 3dlayout Design Of Ship Compartment Based On

Jun-Hua Li, Ying-Fu Zhu, Wen-Ye Ying and Jun Lu Huazhong University of Science & Technology, Wuhan, Hubei, China Wuhan Ship Design and Development institute, Wuhan, Hubei, China CBR(Case Based Reasoning ) is a new method for reasoning in AI. The core of CBR is the case presentation and the case-indexing model. This paper has developed the case-based reasoning for solving the 3D layout design problem of ship compartments. The case presentation with object-oriented (O O) in a compartment is...

H yzd z X y 2Pr

Where, o > 0 < i > 0 r represents incident, diffracted, radiated wave respectively, p is the principal coordinate of mode including elastic deformation, m is number of mode (m 1-6 rigid motions, m> 6 elastic mode). For an undisturbed free surface of incident wave, we can write its potential as follows. ig cosh k(z + d) iHxcosz+ycosz) twl < Po ---- , ' * ' e (2) a, C , x denote angular frequency, amplitude and incident angle of wave respectively, d is water depth, k is wave number...

3

The values H, lim (70() are transferred into the wave scatter diagram and sea states are assigned to a feasible (H, < oil (70))) and an infeasible ( , > H,Mm (T0i)) region. The summation of all occurrences of the infeasible region, , I j 'V,. related to the total number of observations rp, yields the expected probability of downtime P The index k ranges over all Hs -classes where H (T0l) exceeds lim (T0l) To account for the non-uniform distribution of wave directions the computed values of...

Energy And Environment Dimension In Ship Manufacturing Processes

Department of Naval Architecture and Marine Engineering Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt The main issues of energy and environment associated with shipyards manufacturing processes are presented. The direct and indirect demands of energy in the shipbuilding industry are clarified. The Life Cycle Analysis (LCA) in ship production is addressed with particular emphasis on the methods commonly used to reduce energy consumption and relevant harmful environmental...

Kpc KpcTmT kptct KP

-,v D D r -r * p c, f.p.c *e,pc,ce K,p,c Tm T T )l2. In Eq. (2) and (3), d is the plate thickness, and subscripts n, s, e and w refer to north, south, east and west cell faces shown in Figure 7. At each grid point, heating surface temperature Ts,i can be calculated by Eq. (2) or (3). Surface heat flux qs i is given by the following equation. The temperature dependence of the material properties used are shown in Figure 8. Figures 9 and 10 show the distributions of the estimated heating surface...

2 Design Recommendations

The hot spot stress in tubular joints has the last 25 years been derived by some extrapolation of the measured calculated stress at the hot spot region back to the weld toe. The local stress effect due to the weld is accounted for in the S-N curve. Similar concepts were also investigated in the present project, ref. Fricke (2001). Three different methods for derivation of hot spot stress (geometric stress) were investigated Linear extrapolation of stresses to the weld toe from stress at...

Estimating The Risk Of Cargo Shifting In Waves Methodology And Results

L(b Ericson) Naval Architecture, KTH, SE-100 44 Stockholm, Sweden 2Center of Safety Research, KTH, SE-100 44 Stockholm, Sweden An important cause for ship casualties is cargo shifting in rough seas. According to statistics approximately 10 of the founderings of general cargo ships are related to the shifting of cargo. Damage to cargo also means large costs to ship and cargo owners and insurance companies. This paper presents a methodology to calculate the long-term risk of initial cargo shift...

2speed Trial Analysis Procedure Of Isodis 15016

The analysis procedure of ISO DIS 15016 is divided into six steps. This analysis procedure is based on Taniguchi-Tamura's Method (Taniguchi etc., 1966). Various calculation methods of resistance increase due to the disturbances and the deviations are suggested to use at annex of ISO DIS 16016. In this guideline, it has described that the methods presented in the annexes are the latest one available today, other scientifically-based method including model tests may be adopted as agreed between...

3 Extension Of The Project

A number of participants have shown interest in planning an extension of the project (Phase II). An extension of the project is planned to contain > Further work to achieve a reliable link between calculated stress from FE analyses and S-N data for fatigue cracks initiating from weld toes and from the roots of fillet welds that is numerical accurate, robust and efficient to use by engineers. > Further fatigue testing to achieve S-N data for other typical FPSO details that can be used for...

3 Results For Wigley Hull

Wigley's (1942) parabolic hull is used in the case studies. The hull surface for y > Ois given by 5 2 L LIT JL T . Here the origin for x,y and z is on the centreplane at the waterplane amidships. I,Sand T are respectively the length, beam and draught, where BIL 0. and TIL- 0.0625 in our case. We divided the centreplane into panels and the source density on each panel was taken as constant and equal to its value at the middle of the panel. Convergence studies were done by using different...

R rx rv rz

Y Total Factor of Safety Y, factor taking account of the safety of the system Yy factor taking account of the risk to human life Yz factor taking account of the risk to ecology It is evident that the irrational increase in the magnitude of the total Factor of Safety of ship structure will not only reduce the probability of structural failure, the cost of failure, the harmful impact to the environment but will also increase the initial cost of ship structure through the irrational use of...

Evaluating Design For Upgradeability A Simulation Based Approach For Ships And Marine Products

Dept of Marine Technology, University of Newcastle, Newcastle NE1 7RU, UK School of Engineering, University of Northumbria, Newcastle, NEI 8ST.UK Major engineering products like ships, offshore plant and power stations have lives of over 20 years. Technical and market changes may require mid-life upgrading, such as increasing capacity by jumboisation or installing new machinery or equipment. The question for the designer is how far to design for such upgradeability, e.g. by provision of...

Fully Nonlinear Wave Computations For Arbitrary Floating Bodies Using The Delta Method

Department of Mechanical Engineering Tamkang University, Taipei China Fully nonlinear water wave problems are solved using Eulerian-Lagrangian time stepping methods in conjunction with a desingularized approach to solve the mixed boundary value problem that arises at each time step. In the desingularized approach, the singularities generating the flow field are outside the fluid domain. This allows the singularity distribution to be replaced by isolated Rankine sources with the corresponding...

Study On An Information System Of Damages Of Ship Structures

Sakuragi2 and Y. Sumi1 1 Department of Naval Architecture and Ocean Engineering, Yokohama National University, 79-5 Tokiwadai Hodogaya-ku Yokohama 240-8501, Japan 2 Formerly Graduate Students of Yokohama National University Subcritical damages such as fatigue cracks and corrosion do not immediately cause a loss of serviceability or serious disaster such as oil spill from tankers. However, the maintenance of ship structures is very important to avoid such casualties....

Study On The Horizontally Dynamic Behavior Of A Vlfs Supported With Dolphins

Graduate Student, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan Hiroo Okada, Takashi Tsubogo and Koji Masaoka School of Engineering, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan This paper deals with the horizontally elastic behavior of a very large floating structure (VLFS) supported with dolphins under dynamic loads. Eigen frequencies for vertical vibration of VLFS exist continuously in relatively high frequency zone due to the buoyancy effect. On the other hand, the...

Bayesian And Neural Networks For Preliminary Ship Design

Friis-Hansen, N. Bjarneboe Department of Mechanical Engineering, Maritime Engineering Technical University of Denmark DK-2800 Kongens Lyngby, Denmark To ease the determination of the main particulars of a ship at the initial design stage it is convenient to have tools which, given the type of ship and a few other parameters, output estimates of the remaining dimensions. To establish such a tool, a database of the characteristics of about 87,000 ships is acquired and...

Innovation In Ship Production What Can We Expect

Forschungszentrum des Deutschen Schi baus, Bramfelderstrasse 164 22305 Hamburg, Germany The paper deals by way of example with some aspects of innovative ship production. It is a European's viewpoint and it is meant to provoke an integrated vision of the total process from early design to delivery of the finished product. It points out the increasing value and importance of innovative IT tools along the process chain and leads to radically new concepts for the production of the hull structure....

Study On Heat Transfer Between Gas Flame And Plate During Lineheating Process

Hashimoto1, N. Shinkai2, J. Sawamura1 and K. Matsuoka1 ' Department of Naval Architecture and Ocean Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka 565-0871 Japan 2Bureau Veritas Japan, 93, Edomachi, Chyuoh-ku, Kobe, Hyogo 651-0033 Japan The transient 3-dimensional temperature distribution near the plate surface of the spot heating gas flame is measured in detail by a high performance L.I.F. measurement system. It has been found that the thermal-flow field...

Waves

Division of Naval Architecture, Royal Institute of Technology, KTH Stockholm, S-100 44, Sweden A 2-dimensional non-linear time-domain simulation model tailored for planing hulls in head seas, is presented together with results from model experiments, studying motional response and hull pressure distribution. A wave equation representation of the wave measurement is used in the numerical simulations enabling direct comparisons between simulated and measured time series. Compared quantities are...

Extreme Response And Fatigue Damage Of Shipshaped Fpso

Chun-Tian Zhao, Yong Bai and Yung Shin American Bureau of Shipping, 16855 Northchase Drive, Houston, TX 77060 In the design of ship-shaped Floating Production Storage Offloading (FPSO) systems, a rational strength assessment is required to ensure structural safety. This paper presents a systematic method to predict extreme response and conduct fatigue assessment, in which the site-specific wave conditions and the service history are accounted for. The extreme response is predicted using both...

Optimization Of The Design Of Ship Structures Using Response Surface Methodology

'Department of Naval Architecture & Ocean Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan In this paper, the applicability of response surface methodology (RSM) to the design of ship structures is examined. This methodology involves the following mathematical techniques a method of designing experiments that allows an efficient and accurate grasp of response features using a minimal number of analyses, the least squares method to obtain an...

Hull Form Design Of Cargo Ship In Shallow And Strong Current Waterways

Li-Zheng Wang and Long-Fei Xi Transportation Collage, Wuhan University of Technology Wuhan 430063. China In China there are some rivers located in mountain area and its valley appears to be V or U type alternatively, where there are many beaches, quick and disorder waters, narrow course, curved channel, greater changes of depth in different seasons and so on. As far as the waterways with shallow and rapid current having characteristics described above is concerned , it is a key problem how to...

Ship Design Using Probabilistic Damage Stability Rules A Sensitivity Study

Lauridsen, Jargen Juncher Jensen and Jan Baatrup Department of Mechanical Engineering Section for Maritime Engineering, Building 10IE Technical University of Denmark DK 2800 Lyngby, Denmark The current IMO resolutions contain two different probabilistic damage stability regulations A.265 for passenger vessels and SOLAS Part B-l for dry cargo vessels. However, ongoing harmonization studies as those presented in the IMO documents SLF 42 5 and SLF 43 3 2 aim at one single damage...

Effects Of Different Three Dimensional Formulations On The Seakeeping Computations Of High Speed Hulls

Sebastiani 'Department of Naval Architecture,University of Genova, Via Montallegro, 1 16145 Genova Italy 2CETENA Via Ippolito d'Aste, 5 16121 Genova Italy The present interest in high speed hulls reflects also in their seakeeping performance so, with the aim to have proper methodologies to deal with this problem, the speed of advance must be taken into account by suitable methods. In this paper two different Green function formulations for the radiation and...

Simulation Of Viscous Flow Of Modern Surface Ships Using The Finflo Rans Solver

Ship Laboratory, Helsinki University of Technology P.O.Box 4100(0takaari 4) FIN-02015 HUT, Finland A FINFLO solver for simulation of a turbulent free-surface flow around a modern ship has been developed through resolving the RANS equations with the artificial compressibility that incorporates a treatment of the free-surface boundary conditions. Within a moving mesh system, a cell-centred finite-volume multigrid scheme and two turbulence models, the Baldwin-Lomax model and the Chien's low...

J

Figure 1 General arrangement of Ro-Ro passenger ferry. Length bpp 134m, breadth moulded 24.8m, design draught 5.8m, GM (full load) 3.54m, service speed 18.5 kn, cars 294, passengers 900 Five different calculations of the Attained Index A have been made by use of more and more simplified layouts of the subdivision as defined in Table 1. For each layout both the current SOLAS Part B-l regulations and the draft for harmonized regulations, given in IMO document SLF 43 3 2, are applied. In the...

Design Of Fpsos Based On Maneuvering Stability

Sales Jr.' and S.H. Sphaier' 1 Department of Ocean Engineering, COPPE, Federal University of Rio de Janeiro, Brazil Ships have been used as floating units to store, process and transfer oil to shuttle ships. In currents their movements in the horizontal plane may present an unstable behavior. Based on linear stability analysis, a procedure is presented here to help the engineer to account for the phenomena in the design of new units and in the offloading operation. Three...

Experimental Investigation Of Bank Effects Under Extreme Conditions

Extreme Civil Engineering

Ottosson and P. Tr g rdh SSPA Sweden P O Box 24 001, SE-400 22 G teborg, Sweden Experiments on bank effects in extreme conditions were carried out for three ships a low speed displacement tanker, a mono-full ferry and a catamaran. The last one is a large high-speed craft. Five long bank models were tested. The influence of propeller loading on bank effects and the wave pattern during bank passage were also studied. For the tanker, results indicated that there is a...

Design Synthesis For Ships And Floating Systems

A Consideration of Life Cycle Cost of a Ship Yasushi Kumakwa and Hiroshi Sasajima The Experiment of River-Sea-Going Ore Barge Fleet and Renovation of Existing Integrated Barge Shun-Huai Chen, Wei Zhang, Jun-Ming Li and Cheng-Fang Wang Optimization of a Wave Cancellation Multihull Ship Using CFD Tools C Vang, R. Lohner and O. Solo The Fine Optimization of Ship Hull Lines in Resistance Performance by Using CFD Approach Parametric Hull Form Design - A Step Towards One Week Ship Design C Abt, S D....

Calm Water Experimental Research On Geosims Of High Speed Trimaran Hydrodynamic Characteristics And Modelship

Ermina Begovic, Carlo Bertorello and Pasquale Cassella Department of Naval Architecture and Marine Engineering University of Naples Federico II via Claudio, 21-80125 Napoli, Italy In this paper a trimaran ship equivalent to a typical high speed craft in service in the bay of Naples has been considered. Two vessels having different only outrigger hull forms have been designed on the basis of required lay-out, of the limits in the main dimensions and of the available data from existing design....

Viscous Flow Calculations Used For Dredger Design

Valkhof1 ' MARIN, P.O. Box 28, 6700 AA Wageningen, the Netherlands 2IHC Holland NV Dredgers, P.O. Box 1, 2960 AA Kinderdijk, the Netherlands For a single screw Hopper Dredger, which meanwhile has been constructed and is operating successfully now, as shown below, IHC HOLLAND NV DREDGERS (IHC) studied the viscous flow and the related wake distribution with the aid of MARIN's viscous flow code PARNASSOS. Due to the very short building time, demanded by the...

Cfdbased Parametric Study On The Smoke Behavior Of A Typical Merchant Ship

Eunseok Jin, Jaedon Yoon and Yongsoo Kim Daewoo Shipbuilding & Marine Engineering Co., Ltd., 1-Aju-Dong, Koje-City, Kyungnam, 656-714 Republic of Korea In this paper, a CFD based parametric study is introduced, which is intended to investigate the smoke behavior depending on the funnel and accommodation arrangement. Corresponding calculation results were analyzed systematically and a simple measure was obtained, which hopefully could be applied to the preliminary design of funnel and...

Developing Seakeeping Performance Criteria For A Helicopter Pilot Training Vessel

Centre for Marine Technology Dcfcnce Evaluation and Research Agency Haslar, Gosport, Hampshire, P012 2AG, UK The current approach to procuring new equipment in the UK MOD is to specify as completely as possible the requirements rather than to make recommendation for possible design solutions. In terms of a new vessel the requirements will include the expected performance in rough weather. It is important that throughout the whole procurement cycle the customer and the contractor must be...

Measurement Of Ship Motion During Model Tests And Full Scale Seakeeping Trials

Nan Xie, Guo-Liang Qian, Huan-Qiu Gao, Na-Xin Wei China Ship Scientific Research Center, Wuxi,214082, China A measurement system has been developed for recording ship motions during model tests and seakeeping trials. The system consists of accelerometers, angular rate sensors and a PC with data logging and analysis software. The non-linear iterative approach is used for the data processing. Model tests at wave basin and full scale ship trials were conducted to verify the system. The comparison...

Design Modification Of Vlcc With Wide Web Frame Space

Jae-Hyung Park, Chang-Hwan Jang and Joo-Ho Heo Design Tech. R amp D Team Daewoo Shipbuilding amp Marine Engineering Co. 1 Ajoo, Koje, KyoungNam, Korea A new VLCC Very Large Crude Oil Carrier for improving productivity is suggested and the development procedures for the new VLCC are introduced. In the stage of initial design, a new VLCC with eight web frames and one swash bulkhead per one hold is suggested to reduce the number of web frame. Longitudinal structural members having sufficient...

Experimental Study On The Hydroelastic Response Characteristics Of A Pontoon Type Floating Structure

Hong2 and Y.J. Ji3 'Korea Institute of Machinery and Materials, Yusung P.O. Box 101, Daejeon, 305-600, Korea 2Korea Research Institute of Ships and Ocean Engineering, Yusung P.O. Box 101, Daejeon, 305-600, Korea 3Super Century Co., Ltd, 220 Kung-Dong, Yusung-Gu, Daejeon, 305-764, Korea A model test with the scale ratio of 1 20 was carried out to investigate the hydroelastic response characteristics of a pontoon type floating structure in waves. In particular, the...

9double Hull Bulk Carriers

Another approach to increasing the structural safety of bulk carriers is to consider the double hull bulk carrier. Some of the structural benefits of a double sided bulk carrier when compared to a single side skin bulk carrier are that the double side eliminates the exposed, damage-prone side frames and their end attachments. It also protects against corrosion and mechanical damage The smooth tank surface provides a better quality surface preparation and coating application. The stiffer double...

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

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 Floating Structures

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...

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 Loads

'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

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...