Structural Design of 45000t Con-Ro Ship

 

OUYANG Jie，SHEN Zhao-hui

（Hudong-zhonghua Shipbuilding (Group) Co., Ltd., Shanghai 200129, China）

 

Abstract: The 45000t Con-Ro ship is a brand new ship type with very complicated hull structures. It adopts completely different design concept from conventional Con-Ro ships, in which the middle hull area is arranged for ro-ro cargo and the fore and aft areas for container. It also adopts the large opening and hatchless design for the container compartment below the main deck. The innovative design can effectively reduce the amount of ballast water in operation, maximize the loading capacity and improve the economic efficiency of the ship. This paper mainly introduces the structural characteristics, design difficulties and the strength calculation problems in the design, and elaborates the design of critical positions. The solutions for the structural design problems and the design methods of the ship could be a reference for the design of similar ships.

Key words:Con-Ro vessel; global longitudinal strength; rigid design; ro-ro equipment; transition structure; fatigue strength analysis

 

 

 

 

Study on the Seismic Response Analysis of Subsea Christmas Tree Structure Based on Response Spectrum Method

 

GUO Jun-hua¹，LIU Liu-hao-zhi¹，WEN Zhi-jie¹，

WU Fan¹，MA Guang-can¹，Chen Xu-jun²

（1. College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China;

2. Shanghai Zhenhua Port Machinery (Group) Co., Ltd., Shanghai 200125, China）

 

Abstract: In order to study the influence of earthquake on Christmas tree structures, this study uses the spectrum method to perform the response analysis of the Christmas tree structures under earthquakes. Modal analysis is carried out for the structures to evaluate the potential probability of adverse dynamic responses occurring to the structures. The seismic response spectrum analysis method is adopted to analyze the seismic responses of the Christmas tree structures in the X, Y and Z directions. The results show that vertical earthquakes have the largest influence on the structures, but the earthquake does not have major influence on the Christmas tree structures in the selected sea regions.

Key words:christmas tree; seismic response; ANSYS; response spectrum

 

 

 

 

Study on the Damage Stability of Large Seagoing Rescue Ships

 

LIU Jin-gang

（Shanghai Merchant Ship Design and Research Institute, Shanghai 201203, China）

 

Abstract: This article introduced the characteristics of large rescue ships and the damage stability requirements they need to meet, and analyzes the influence of hull features on damage stability. The damage stability requirements are compared and analyzed according to different rules and regulations; then the damage stability of special purpose ships and public service ships developed based on the rescue ship is analyzed. The result is expected to be a reference for the development of new ship types.

Key words:seagoing rescue ship; damage stability; special purpose ship; public service ship

 

 

 

 

General Design of a 30000dwt Training Ship

 

YANG Bo¹，WANG De-an¹，CAO Shan-lin¹，WU Xiong-li¹，WAN Fang¹，DONG Fang²

（1. Shanghai Merchant Ship Design and Research Institute, Shanghai 201203, China；

2. Dalian Maritime University, Dalian 116026, China）

 

Abstract: The 30000dwt training ship designed by Shanghai Merchant Ship Design and Research Institute (SDARI) for Dalian Maritime University is an advanced ocean going multi-purpose training vessel with heaving lift. It is engaged mainly in teaching, training and research works of the students majored in navigation, and subsidiarily in the transportation of bulk cargo, machinery pieces and containers. This paper briefly introduces the features of the ship in terms of teaching and training, cargo transportation, safety, advancement, energy saving and environmental friendliness, etc.

Key words:ship for education and training; multipurpose cargo vessel; eco-friendly ship; safety; advancement

 

 

 

 

Study on the Power System Integration Design of

 a 36000dwt Multi-Purpose Vessel

 

WANG Jian-zheng，LI Shan-cong，WANG Tao，FU Jun-tao

（Hudong Heavy Machinery Co., Ltd.,Shanghai 200129, China）

 

Abstract: According to the specifications of the main propulsion system and the rules of classification for the 36000dwt multi-purpose vessel, resistance computations are performed with HydroComp software and ShipPower software on the basis of hull parameters in order to obtain the resistance of the ship. Then, HydroComp software is used again for the preliminary design of hull-engine-propeller matching based on the resistance obtained to define the power of the main engine and the optimal rpm of the propeller. After that, main engine could be selected with a comprehensive consideration on engine power, propeller, optimal rpm, initial investment, fuel consumption, weight, sea margin and etc. HydroComp software is also used for the final design of hull-engine-propeller matching according to the main engine selected and the ship resistance in order to define the main parameters of the propeller such as diameter, average pitch, area ratio and efficiencies. Finally, shaft system preliminary design is performed in accordance with the classification rules to determine the shaft diameter and thus ship design is accomplished. The result shows that the design can meet the requirements of the specifications and the parameters can be used as the base of both the quotation of power system and the purchase of main engine, shaft system and propeller.

Key words:machinery engineering; power system; integration; project design; HydroComp

 

 

 

 

Study on the Jacking Control System for Jack-Up Drilling Platform Based on Variable Frequency Drive

 

YUAN Fei-hui，ZHANG Ji-yu

（Shanghai Waigaoqiao Shipbuilding Co., Ltd., Shanghai 200137, China）

 

Abstract: This study proposes a design principle of comprehensive protection measures which combines the failure security control circuit and the redundancy communication network for the jacking control system of JU2000E jack-up drilling platform in order to improve the safety of jacking operation of the jack-up drilling platforms. The principle is suitable for the conventional variable frequency driven jacking control system both theoretically and practically. The failure mode influence analysis and the jacking experiments verify mutually the effectiveness and the reliability of the comprehensive protection measures under different conditions.

Key words:jacking control system; safety; redundancy; protection

 

 

 

 

Analysis on the Configuration of Propulsion and Power Systems for both Medium and Large AHTS Vessels

 

HU Peng

（Shanghai Jiao Tong University, Shanghai 200030, China）

 

Abstract: Anchor Handling Tug Supply (AHTS) vessel can be used not only for anchor handling, provision supply and large offshore structures towing such as drilling platforms towing, but also for emergency rescues under special circumstances. Therefore, the required propulsion power and electrical loads are very different under different operation conditions (e.g. towing, full speed cruising, economical cruising and dynamic positioning). If all the operation conditions could be considered comprehensively in the preliminary design stage to have the propulsion power and electrical loads deployed properly, the operations of the vessel can be ensured with lower initial investment and lower operational costs. Further analysis on the configurations of two types of the major propulsion and generator system is also carried out according to the operational characteristics of AHTS to discuss the selection and optimization of the configuration for the propulsion and generator system of the future.

Key words:machinery engineering; medium to large size; AHTS; shaft generator; propulsion

 

 

 

 

Evaluation and Optimization of Simulation Based Block Construction Scheme for Indoor Assembly

in Welding Workshop

 

ZHU Ming-hua¹，LI Pei-tian¹，SHAN Xiao-fen¹，MAO Shen-fei¹，ZHU Ren-gui²

（1. Jiangnan Shipyard (Group) Co., Ltd., Shanghai 201913, China；

2. CSSC Huangpu Wenchong Shipbulding Co., Ltd., Guangzhou 510715, China）

 

Abstract: This study establishes a 3D simulation model for the block construction (including section assembly) of indoor assembly in welding workshop based on the production scheduling simulation method. Accurate evaluation of production capacity, space utilization, production plan and other parameters for the specific construction can be achieved with the simulation data and the production plan and space arrangement are optimized with a sequence based optimization method to rectify the inappropriateness. The result of the analysis on some examples shows that the proposed optimization method can reduce the block construction cycle, increase space utilization, and thus provide support to the production plan making and to the improvement of production scheduling.

Key words:simulation; indoor assembly in welding workshop; block construction

 

 

 

 

Installation Design of Guide Rail Bracket and Rain Cover

for 45000t Con-Ro Vessel

 

ZHAO Zhi-hua，WANG Zhong-qiang，YANG Rui-ling

（Hudong-zhonghua Shipbuilding (Group) Co., Ltd., Shanghai 200129, China）

 

Abstract: The 45000t Con-Ro vessel innovatively used the continuous super-high guide rail bracket with rain cover to confine, guide and bear the containers both inside and above the compartment without any hatch or lashing, and in this way to realize high container loading efficiency and reduce labor workload in the port. This paper studied and summarized the technologies concerning the rain cover and guide rail bracket of the ship, analyzed its differences from traditional containerships as well as its technical difficulties and design improvement. The study was expected to be helpful to the improvement of the construction quality and the realization of the anticipated design effect.

Key words:Con-Ro vessel; guide rail bracket; rain cover; continuous; super-high; lashing; accuracy

 

 

 

 

Study on the Installation of Hoistable Car Deck for

45000t Con-Ro Vessel

 

WANG Zhong-qiang，ZHAO Zhi-hua，JIANG Dong-hua

（No.2 Ship Design & Research Institute, Hudong-zhonghua Shipbuilding (Group) Co., Ltd., Shanghai 200129, China）

 

Abstract: The hoistable car deck inside 45000t Con-Ro vessel provides more parking spaces for cars, which not only meets different cargo loading requirements but also makes full use of the interior hull space. The deck is pulled by the electric winch that moves back and forth along the rail between the storage position and the working position. This paper discusses the characteristics, installation requirements and installation procedures of the hoistable car deck, and proposes a preliminary installation procedure as construction suggestion to ensure the deck to achieve the anticipated result.

Key words:Con-Ro vessel; hoistable car deck; ramp; rail; adjusting pad

 

 

 

 

Study on Hinge Alignment and Its Measurement Technique

in Large Quarter Ramp Installation

 

HUANG Zhong-jian，HUANG Yun-feng，YANG Li-zhi，WANG Hui

（Hudong-zhonghua Shipbuilding (Group) Co., Ltd., Shanghai 200129, China）

 

Abstract: Quarter ramp is the passage for cargos and vehicles rolling on/off the Ro-Ro ship. It is usually connected to the ship by a number of hinges. The manufactory of the quarter ramp has strict regulations on the coaxiality of the hinges, which means the hinges must be measured and controlled in the installation to realize a precise alignment. In this paper, the measurement method of the coaxiality for large size hinges is studied by measuring the deflection of the main engine foundation on the basis of the sagging of a piano wire, and thus the approximate center line of the hinges is obtained. Then a model for the sagging curve of the piano wire is established in accordance with the gravitation, and the offset between the sagging and the center line of the hinges is calculated. In addition to this, an alignment tool to measure and control coaxiality is designed, which have two points flashing on the center. These two points indicate the center line of the hinges found by the laser theodolites, and the piano wire is fixed and strained on the tool with the two points as the scale mark. The result of the study has been successfully applied to the hinge installation of the quarter ramps on the 45000t Con-Ro ship series, which plays an active role both in raising work efficiency and in improving the quality of the equipment.

Key words:quarter ramp; hinge; coaxiality; piano wire

 

 

 

 

Key Technologies of 18000TEU Container Ship Construction

 

LIU Jian-feng，ZHANG Hai-yong，SUN Jian-zhi，LU Jun-guo，SHAO Dan

（Shanghai Waigaoqiao Shipbuilding Co., Ltd., Shanghai 200137, China）

 

Abstract: This paper introduces the key technologies of the 18000TEU Container Ship construction, including integrated construction of hatch coaming and torsion box, welding deformation control, accuracy control, transverse bulkhead overall construction, mock-up test and etc. Based on the construction technologies of this vessel, suggestions for the improvement are proposed to optimize the construction process of the subsequent vessels.

Key words:ship and naval architecture; containership; thick plate welding; method design; accuracy control

 

 

 

 

PLC Based Model Programming Design for

Ship Swaying Platform

 

YU Fan-yong，LIU Yan-dong，CHEN Hai-quan

（Navigation Training and Research Center Dalian Maritime University, Dalian 116026, China）

 

Abstract: A Programmable Logical Controller (PLC) programming design is performed for the platform swaying model according to the functional requirement of a ship swaying platform. The control principle and control system of the platform are analyzed based on a ship roll mathematical model derived according to the real sea conditions, and the platform swaying model program is designed with PLC modular programming concept. The experiment result shows that the platform simulation effect is significantly improved along with the amendment of the design, which could realize the simulation of ship swaying motions under real sea conditions.

Key words:ship swaying platform; PLC; roll mathematical model