Design of Fully Suspended Twisted Rudder with Rudder Trunk

 

ZHANG Li, WANG Hai-bo, GUAN Qing-xiang, WANG Yun-cai

(Merchant Ship and Offshore Design and Research Institute,

Dalian Shipbuilding Industry Design & Research Institute, Dalian 116005, China) 

 

Abstract: Design optimization of the fully suspended twisted rudder with rudder trunk is carried out on the rudder system calculation and the design of rudder blade, skeg, rudder stock, rudder sleeve and rudder bearing. The CFD software is used in the calculation and analysis to make sure that the holistic rudder system design meets the performance expectation.

Key words:suspended rudder; twisted; skeg; rudder trunk

 

 

 

Analysis of Vibration Performance for an Aframax Oil Tanker and

Its Comparison with Actual Measured Response

 

WANG Ming, FU Jia, SHENG Li-xian

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

 

Abstract: Hull vibration response is a major factor that affects the fatigue damage of ship structure, the operation of machinery and equipment, also the daily life and work of crew. The Aframax oil tanker sailing in ice region requires a good hull vibration performance. Therefore, the finite element method is used to comprehensively evaluate the vibration performance of the ship under both ballasted and full-loaded conditions, and the simulated speed response of local structures is compared with actual measured results to validate if the calculation is correct. Both the calculation and the measurement results indicate that the ship’s excellent vibration performance is in compliance with the requirement of vibration code. This study can provide reference for the vibration control of subsequent ships.

Key words:hull vibration; natural frequency; modal analysis; vibration response

 

 

 

Overall Performance ofa Small Waterplane Area              Twin Hull Ship with L-Type Demihulls

 

CHEN Deng

(Shanghai LingYao Marine Engineering Co., Ltd., China Ship Development and Design Center, Shanghai 201108, China)

 

Abstract: This paper briefly introduces the characteristics of a small waterplane area twin hull (SWATH) ship with L-type demihulls, and analyzes the ship’s seakeeping performance based on both theoretical calculations and model experiment. The stability index of the ship is obtained in the theoretical calculations, and the ship’s resistance coefficients are obtained in model experiment, so as to analyze the rapidity of the ship. The ship’s maneuverability data are also presented according to the sea trial results.

Key words:small waterplane area twin hull (SWATH); L-type demihull; seakeeping; rapidity; stability; maneuverability

 

 

 

Cargo Hold Ventilation on 600FEU Reefer Container Ship

 

MA You-ya, XU Lin

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

 

Abstract: Cargo hold ventilation is one of the main difficulties in design of reefer container ships because many factors such as ventilation duct, walkway and equipment maintenance space need to be considered in case the space in cargo holds is limited. This paper introduces a new ventilation design for the cargo hold ventilation of a 600FEU reefer container ship, which has the centralized air supply in the middle of the transversal bulkhead and the natural ventilation outlet on both sides and on the additional hatch cover. This is different from the conventional reefer container ventilation design. CFD (Computational Fluid Dynamics) simulations have proven that the design is feasible and effective.

Key words:cargo hold ventilation; cargo hold walkway; cargo hold structure platform

 

 

 

Finite Element Analysis and Structure Optimization of

380t Rudder Blade Installation Platform

 

JIAO Ling-ling, SHENG Li-xian, LI Xin

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

 

Abstract: MSC.PATRAN & NASTRAN finite element analysis software is used to simulate and analyze the structure stress and deformation of the 380t rudder blade installation platform under working conditions, and an optimal solution is proposed when several structure designs are analyzed and compared. According to the code for design of steel structures and the actual situation, suitable design criteria are chosen to reduce the production cost on the premise that the platform deformation is kept within a reasonable range.

Key words:rudder blade installation platform; steel structures of hydraulic working platform; finite element analysis

 

 

 

Fast Model Predictive Control Algorithm for

Ship Dynamic Positioning

 

QIAN Wei-xin

（China Shipbuilding NDRI Engineering Co., Ltd., Shanghai 200063, China)

 

Abstract: Dynamic Positioning (DP) system enables ship or offshore platform to control its position and heading with adequate thrusters at rough sea. In order to achieve a fast calculation of approximated optimal input for the propeller, a method to increase the speed of Model Predictive Control (MPC) is derived from the sparse structure of MPC formulation. Comparison of fast MPC algorithm and traditional algorithm is carried out on the basis of numerical examples. The simulation result validated that the fast MPC technology has the features of real-time and accuracy.

Key words:dynamic positioning; Model Predictive Control; fast MPC algorithm; MPC formulation structure

 

 

 

Analysis of Influencing Factors on

 the Collision Between Fishing Vessel and Bridge Pier

 

SONG Bo-wen¹, BI Yue-wen², ZHANG Zhao-de¹

1. School of Naval Architecture and Mechanical-Electrical Engineering, Zhejiang Ocean University, Zhoushan316022, China;

2. Rongcheng Shipbuilding Industry Co., Ltd., Weihai, 264309, China）

 

Abstract: Thefinite element numerical simulations are used to simulate the central and eccentric impacts between a fishing vessel and a bridge pier at different speeds and different offset distances. The collision force time curve, energy time curve and the maximum collision depths under different speeds and offset distances are obtained in the analysis. Meanwhile, the damage caused by collision is studied. The calculation results show that the faster the ship runs, the severer the damage would be, and the longer the offset distance is, the larger the damaged area would be. An expert database is established based on the simulation results to reproduce the ship collision accident for evaluation, which provides reference for analysis and settlement of collision accidents.

Key words:collision; fishing vessel; bridge pier; structural damage; finite element

 

 

 

Marine Air Conditioning System with Air Duct Bypass Control

 

YANG Yong

（China Cruise Technology Development Co., Ltd., Shanghai 200439, China)

 

Abstract: In order to realize accurate control and energy saving, a new type of marine air conditioning system with air duct bypass control is proposed to improve the performance of conventional air conditioning systems including individual control of local air conditioning regions or rooms, energy saving, high manufacturing cost and sophisticated control of air volume. The proposed system can realize real-time control and energy saving for local air conditioning region or room with constant air volume, which will not affect other rooms’ air conditioning.

Key words:marine air conditioning; three-way directional wind gate; duct bypass; energy saving control

 

 

 

Simulation of Light Environment for

Marine Engine Room

 

ZHU Yu, YANG Jun, WANG Jie, ZHANG Hong-wei, ZHU Ming-hua

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

 

Abstract: This paper briefly analyzes the new trend of marine engine room lighting system design and the advantages of DIALUX software used in the simulation of engine room light environment. Practically, DIALUX is used to simulate the light environment of a ship’s engine room to obtain the proper illumination distribution of the working space. The calculation results are evaluated according to the relevant regulations, which form the basis of lighting system optimization. Meanwhile, local lighting and emergency lighting are also calculated for the engine room. The proposed calculation method and the conclusions can provide design reference for the similar marine engine room lighting system.

Key words: marine engine room; light environment; DIALUX software; ergonomics

 

 

AIRLOCK Design for Hazardous Area in Offshore Projects

 

YANG Dian, XUE Qing-wei, LU Chun-xia

(Wison (Nantong) Heavy Industry Co., Ltd., Nantong 226009, China)

 

Abstract: This paper discusses the AIRLOCK design requirements by comparing the AIRLOCK design requirements of IEC and IGC rules and then recommends an AIRLOCK design method for the hazardous area of offshore platforms based on the design and construction experience of a FLNG for the reference of designers.

Key words:AIRLOCK; hazardous area; air-tight separation

 

 

 

Developing Inventory of Harmful Materials for New Ships

 

CUI Qing-chen, SUN Long, WANG Fei

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

 

Abstract: In response to the HongKong International Convention for the Safe and Environmentally Sound Recycling of Ships 2009 adopted by International Maritime Organization (IMO), this paper studies the way to develop the Inventory of Hazardous Materials (IHM) for new ships. The steps and major approaches to develop the Inventory are sorted out, and the pros and cons of the methods are discussed. The modern information technology is integrated to find out a more unified efficient developing method on a synchronous software platform based on the webpage or apps of mobile terminals, to provide new considerations and methods for developing of IHM for new ships.

Key words:inventory of hazardous materials; compilation; new ships

 

 

Control of the Roundness for Stern Tube with Welding Counter-Deformationon a 20000 TEU Ship

 

ZHENG Guo-dong, XIONG Tao

(Nantong COSCO Khi Ship Engineering Co., Ltd., Nantong 226005, China)

 

Abstract: The inner diameter variation of the stern tube after welding is studied for super large ships to keep the accurate roundness of stern tube when the boring-less technique is used. As a result, the original method is replaced by the new method which sets counter-deformation before welding to improve the roundness. Practice has proved that the method is very effective in keeping the roundness of stern tube, therefore it is worth promoting.

Key words:stern tube; boring-less; roundness; out-of-roundness

 

 

 

Cost Control in Ship Lifting Design

 

WANG Hong-hao, ZHANG Nan

（Dalian COSCO Shipping Heavy Industry Co., Ltd., Dalian 116113, China)

 

Abstract: In order to effectively control the cost for ship lifting design, this paper elaborates the methods and experience concerning ship lifting design from the aspects of quotas establishment, software optimization, and design innovation of lifting lug and lifting tool, and proposes some improvement measures for conventional ship lifting, which provides cost control reference for shipbuilding companies.

Key words:ship lifting; cost control; improvement measures

 

 

 

Development of Superhydrophobic Lipophilic Material and

Its Oil-Water Separation Performance

 

LI Cun-jun, ZHANG Ying, ZHAO Hua, WANG Hai-rong, LI Liang

（Zhoushan Institute of Calibration and Testing for Quality and Technical Supervision, Zhoushan 316021, China)

 

Abstract: A kind of superhydrophobic lipophilic stainless steel membrane covered by γ-AlOOH coating has been produced with the formless hydrothermal method, where Al(NO₃)₃·9H₂O is used as the aluminum source and urea as the precipitant. The coating film is made of layers of nano sheet, which makes the stainless steel membrane surface more roughly, so as to have the superhydrophobic lipophilic features. The maximum water contact angle of the superhydrophobic lipophilic membrane is up to 160° and the oil contact angle is 0°. The oil-water separation tests have shown that the efficiency for individual separation of oil-water mixture, respectively with gasoline, diesel, edible oil, and lubricating oil, could be over 98.6% and the efficiency for individual separation of diesel and water is as high as 99.6%.

Key words:superhydrophobic lipophilic material; oil-water separation; γ-AlOOH coating

 

 

 

Application of FMEA in Design Project Risk Management

 

CHU Nian-sheng，WANG Xue-zhi

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

 

Abstract: This paper analyzes the rising modification rate caused by failure of measures in the design process of a Platform Supply Vessel (PSV) and proposes to apply the Failure Mode and Effect Analysis (FMEA) method to the risk management of the design. It also suggests that the failure detection and rectification mechanism are integrated into the design, so as to realize close-loop management, effectively reduce design mistake and improve design quality. The analysis proves that the application of engineering analysis method to the management process is quite effective and useful, and the engineering technology integrating with management is significantly important.

Key words:FMEA; design; risk management

 

 

Economic Evaluation Model for

 Coal Wharf Extension

 

WANG Wei-li

（1.Shanghai Ship and Shipping Research Institute, Shanghai 200135, China；

2. College of Transport and Communications, Shanghai Maritime University, Shanghai 201306, China)

 

Abstract: Taking the expansion of a coal wharf ina power plant as the research object, two alternative expansion plansare compared based on the economic evaluation model and are validated for their feasibility. The cost-efficiencyanalysis is takento evaluate the financial efficiencyof the project. Both theplans are proved feasible butthe optimal one cannot be determined. Therefore, the analytic hierarchy process in the economic evaluation model of port expansion project is applied to calculate the weightingratio of the element at each level and rank the order of preferenceon the basis of experts’ scoring, which leads to the result that Scheme Two is the winner.

Key words:wharf; extension project; cost-efficiency analysis; analytic hierarchy process method