《船舶与海洋工程》2021-2
时间:2022/1/6 9:42:08
Market Analysis on 5000TEU Container Vessel
as a New Generation of the Largest Feeder
DENG Kai, YIN Xunbin
(1. CIMC Ocean Engineering Design & Research Institute Co., Ltd., Shanghai 201203, China;
2. CIMC Qianhai Financial Leasing (Shenzhen) Limited, Shenzhen, 518027)
Abstract:A 5000TEU container vessel is used as the research object to analyze the characteristics of the recent feeder routes and the performance of the fleet in operation, where the upsizing trend of the feeder trading market is taken into account to explore the upgrade potential and direction for the kind of container vessel. On this basis, it is proposed that the coming new 5000TEU container vessel can be defined as the largest feeder of the new generation.
Key words:feeder container vessel; main dimensions; regional routes; ports
Design and Analysis of Mooring System for a TLP
Engaged in Tender Assisted Drilling in West Africa Waters
JI Hengteng1, CHEN Guolong2, RAN Zhihuang1, LIU Tuanjie1, YE Wei1
(1.Offshore Tech China Co., Ltd., Shenzhen 518067, China;
2. CNOOC Research Institute Co., Ltd., Beijing 100028, China)
Abstract:This paper introduces the concept and history of Tender Assisted Drilling (TAD), and discusses briefly its characteristics and main application advantages. A Tension Leg Platform (TLP) is taken as the production platform and a proper semi-submersible drilling platform is chosen to assist the practice of TAD in West Africa Waters. The main dimensions of the TLP and the main performance data of the assisting platform are given, and the mooring system for TAD application is designed based on the general arrangements of the two platforms, which includes mooring lines of the assisting platform, the pulling lines of the TLP and the connection lines between the two platforms. Time domain coupled hydrodynamic analysis is performed for the two floating bodies during TAD, and two types of calculation conditions either with or without strong gusts are defined based on the characteristics of West Africa waters. The minimum distance between the two platforms, the maximum travel of the suspension bridge and the maximum tensions of each line are predicted based on the calculations, and the condition of one line broken is considered. The result shows that the design indicators can meet the requirements, and it is feasible for TLP platforms to be engaged in TAD in West Africa waters.
Key words:Tender Assisted Drilling (TAD); drilling assisting platform; Tension Leg Platform (TLP); West Africa waters; multi-body coupling motion analysis
A Research on the Wave Stability of
Prefabricated SEMI Floating Bucket Foundation
WANG Yue1, FU Xiya1, HE Wenkun2, LI Pengfei3, HAN Suyu1, WANG Hui1
(1. School of Civil Engineering, North China University of Technology, Beijing 100144, China;
2. Jiangsu Juxin Oil Pipe Co., Ltd., Yangzhou 225004, China;
3. Chongqing Jiaotong University, Chongqing 400074, China)
Abstract:In order to deal with the issue of wave stability in developing deep-water floating wind turbine piles, a structural form of triangular platform with four pontoons is designed. Wave load simulation test is performed in the wave basin to investigate the motion amplitudes and heeling angles of the tower column in the floating structure under different wave heights to analyze its wave stability. Frequency response analysis is performed using the hydrodynamic software AQWA. Characteristics of the surge and sway amplitudes and the vibration frequency of the model are obtained and compared with the experimental results. The result shows that the data agree with each other, and the numerical simulation result is helpful for understanding the hydrodynamic responses of wind turbines with floating foundations.
Key words:SEMI type; floating foundation; wave load; model test; vibration frequency
Strength Assessment of Launching Schemes for Asymmetric Semi-Submersible Crane Platform Without Cross-Bracing
ZHANG Kun, KONG Guozhao, LI Shaoze
(China Merchants Heavy Industry Jiangsu Co., Ltd., Haimen 226100, China)
Abstract:To solve the problem that the water in dock is not deep enough for the semi-submersible crane vessel to safely move out, this paper proposes two launching schemes and evaluates the change of hull structural strength during the launching process with the finite element analysis method. The result shows that the floating forces can be transmitted to the hull bottom through the sleepers offered in both schemes, and the pressure can be uniformly transmitted to the surrounding structures due to the elasticity of the sleepers, which is beneficial for the protection of the vessel. The maximum stress of hull bottom appears at the bulkhead supported by the sleepers, and the stress value is less than the allowable stress value. This study provides technical support and reference for the selection of safe and economical launching schemes by comparing the two different schemes and summarizing their advantages and disadvantages.
Key words:semi-submersible crane vessel; launching scheme design; asymmetrical and without cross-bracing; structural strength
Weight and COG Control Technology for Polar
Icebreaking Research Vessel
Li Xiaofeng, ZHAO Zhenhua, HAN Bingyang
(Jiangnan Shipyard (Group) Co., Ltd., Shanghai 201913, China)
Abstract:In order to solve the problem that the weight and Center of Gravity (COG) of the ship under construction does not match the design, it is necessary to have an effective weight and COG control for the whole design and construction process. This paper introduces the weight and COG control throughout the entire design and construction process of polar icebreaking research vesselXUE LONG 2, where the control objects are sorted out in advance, control measures are taken, allowable tolerances are properly assigned, exceeding tolerances are carefully dealt with, control scheme is strictly executed and dynamic execution during the whole process is carried out. All of these make the ship's weight and COG gradually approach the design values, and ensure XUE LONG 2 to meet the requirement of weight and COG control. As a conclusion, a complete and effective weight and COG control technology is summarized for the ship.
Key words:regression; design target; polar icebreaking research vessel; weight and COG; control technology
Application of Longitudinal Strength Direct Analysis in
Design of Ro-Ro Ship Superstructure
YE Xu, ZHAO Wenbin, HUA Kang, LIU Hongping
(Shanghai Merchant Ship Design and Research Institute, Shanghai 201203, China)
Abstract:This paper introduces a direct finite element calculation method to analyze the longitudinal strength of the transition area between the superstructure and the hull of Ro-Ro ship. Calculation analysis is carried out on the structure of transition area between superstructure shell and the hull with an autonomously developed program based on the rules of classifications and the existing researches, which shows the optimized structural form meets the regulations of the classification society. This study provides reference for the design of Ro-Ro ships where the longitudinal stress can be considered in the preliminary stage to avoid the large amount of subsequent revisions by proper arrangement. The autonomously developed program can add the global bending moment rapidly, thus increasing calculation efficiency.
Key words:Ro-Ro ship; global longitudinal strength; superstructure
Structural Design Features of 20000m3 LNG Bunker/Carrier
WEN Baohua, LIU Wenhua, CHEN Yanxi
(Shanghai Merchant Ship Design and Research Institute, Shanghai 201203, China)
Abstract:Based on the structural design of liquefied gas bunker vessels, this paper elaborates the features of a 20000m3LNG bunker vessel respectively on the still water bending moment design, the structural layout and design regulations, the hull temperature distribution calculation and steel grade selection, the typical saddle structure and anti-floating structure design. On this basis, finite element strength analysis and vibration and noise analysis are performed for the ship, and the key technology features of the structural design are summarized, which provides design references for liquefied gas vessels of the same type.
Key words:LNG carrier; LNG bunker; Type C independent tank; structural design; structure features
A Study on Vibration Reduction Technology of
Central Control Room on Polar Research Ship XUE LONG
ZHOU Yan1, XU Ning2, DONG Jiahuan1, ZHOU Haojie2, YE Linchang1, ZHU Weiwei1
(1. Shanghai Marine Diesel Engine Research Institute, Shanghai 201108, China;
2. Polar Research Institute of China, Shanghai 200136, China)
Abstract:There has been a large vibration inside the floor of central control room since the main engine and generator sets of polar research ship XUE LONG were replaced during the maintenance in 2013. After inspections and measurement analysis, the coupled vibration source that causes the excessive vibration in the central control room is found. Then vibration control measures are produced to the vibration source and its transmission path. The emission pipes are modified, the evaluation and optimization of the central control room structures are carried out and the damping treatment is implemented. Some improvement schemes are designed and optimized, and a feasible optimization scheme is formulated, which is tested in the sea trial and the result shows that the vibration in the central control room is well reduced, making the ship satisfying the highest comfort level of China Classification Society.
Key words:local vibration; modal analysis; vibration measurement; coupled vibration; central control room
A Modified Calculation Method for Submarine
Cable Reeling Parameters
HU Zhenwu, CHEN Shihai
(Shanghai Salvage, Ministry of Transport, Shanghai 200090, China)
Abstract:To accurately calculate the submarine cable reeling parameters of the cable laying plan, a relatively practical calculation method is proposed on the basis of two theoretical cable reeling parameter calculation methods. The comparison of three calculation methods shows that the proposed method is more accurate in calculating and validating the cable reeling parameters, which provides reference for the determination of cable reeling parameters and selection of relevant equipment in submarine cable laying engineering practices.
Key words:offshore engineering; submarine cable; cable reeling; cable reeling capacity
Design of Anchors and Chains for Ice-Going Ships
WU Wenxiang
(China Classification Society Wuhan Branch, Wuhan 430022, China)
Abstract:The method of bow anchor and chain design based on ship outfitting numbers has certain applicable premises that can hardly be satisfied under ice environment. Therefore, the design of anchors and chains for ice-going ships on the basis of the outfitting number method should be specially considered, where the key problem is to solve for the anchor chain loads under the combined action of wind, current, wave and sea ice. In order to effectively obtain the anchor chain loads in a convenient way, the combined wind, current, wave and sea ice physical model is simplified, and empirical formula are adopted to facilitate the calculation. Then the design scheme of the bow anchor and chains is created according to the anchoring demand of the ice-sailing ship, and the design reliability is validated through the design applicability assessment.
Key words:ice-going; anchor; chain; applicability assessment
RPD Measurement and Analysis on Truss Legs of
Wind Power Platform
XU Jinchu1, ZHANG Lei1, LI Yingqiang2
(1. CSSC Huangpu Wenchong Shipbuilding Co., Ltd., Guangzhou 511462, China;
2. Guangzhou Salvage Bureau, Ministry of Transport, Guangzhou 510260, China)
Abstract: Boththe Rack Phase Difference (RPD) and the Rack Phase Velocity (RPV) of the main chord racks on the same leg are measured manually and electronically during the whole lifting process of a wind power installation platform with truss type pile legs. On this basis, the variations of RPD value in the lifting process are analyzed to find out the influencing factors on the RPD value and to put forward the measures to control variation. This study provides reference for subsequent platforms of the same type to control RPD value, so as to improve the stability of lifting process.
Key words:truss type pile leg; pile leg strength; whole lift; Rack Phase Difference (RPD); control measures
Preparation of Super Hydrophobic and
Oleophilic Sponge Material and Oil-Water Separation
LU Fangfang, LI Cunjun, WANG Hairong, LI Liang, Ye Xianhuai, CHEN Jinghua
(Zhoushan Institute of Calibration and Testing for Quality and Technical Supervision, Zhoushan 316000, China)
Abstract:The commercial polyurethane sponge material is roughened by acid solution (sulfuric acid and chromium trioxide solution) before the super hydrophobic and oleophilic polyurethane sponge is prepared by the hydrolyzing and condensation reaction of methyltrichlorosilane. The uniformly covered polysiloxane layer on the composites surface creates its super hydrophobic and oil-wet characteristics. The average water contact angle of the composites is 162°±2°, and the oil contact angle is 0°. The oil-water separation test shows that the single-time oil-water separation efficiency of the oil-water mixture of gasoline, diesel oil, lubricating oil and edible oil is over 96%, and the single-time oil-water separation efficiency of diesel-water mixture is as high as 97.2%.
Key words:polyurethane sponge; super hydrophobic and oleophilic; oil-water separation
Data Inheriting Methods of Ship Digital Collaborative Design
Based on 3DEXP
SHAN Xiaofen, ZHU Yu, ZHU Minghua, LIU Yongzhen
(Jiangnan Shipyard (Group) Co., Ltd., Shanghai 201913, China)
Abstract:To deal with the issues of long R&D period and the difficulties in quality control caused by the unsatisfactory collaboration between design institute and shipyard including the tedious delivery process of two-dimensional drawings and the indirect data transmission and inheriting in the current ship design process, this paper analyzes the process of ship digital collaborative design and the way of data interaction based on 3DEXPERIENCE platform (3DEXP), and investigates in-depth the methods to create data receiving environment and data inheriting procedure, to support the delivery of 3D models from design institute to shipyard. The method has the advantage of integrity definition of 3D model to ensure the uniform data source, reduce design changes, improve the quality of ship design and shorten the development cycle.
Key words:3DEXPERIENCE platform; ship; digital; collaborative design; data inheriting
A Study on 3D Model Based Block Assembly Visualization
WANG Dawei, WANG Yixin, LI Xue, XU Dexi, HE Zhen, AI Houshuai
(Dalian Shipbuilding Industry Design & Research Institute, Dalian 116005, China)
Abstract:The 3D model based assembly visualization technology is studied to improve the design visualization technology of hull assembly for hull structure construction, and thus to guide the production effectively and to increase the production efficiency. This paper systematically clarifies the visualization design of hull assembly, including producing drawings based on work sequence, integrating drawing information, 3D visualization technology, the visualization system and the final in-site visualization design under complete digital environment, which provides reference for the collaborative expression of the assembly and installation drawings of other outfitting designs in hull construction, and lays foundation for the realization of complete 3D digital construction of ships.
Key words:3D; block assembly; visualization; core of intelligent manufacturing
A Study on Optimization of Large and
Complex Block Assembly Process
YU Yang, HU Chengcheng, YANG Keming, YUAN Lei
(Jiangnan Shipyard (Group) Co., Ltd., Shanghai 201913, China)
Abstract:To shorten the period of block manufacture and improve the block production capability, a critical path that affects the entire block manufacturing cycle is found by analyzing the typical hull segment construction process and sorting the urgency level of the work tasks. On this basis, the measures of separate construction of small assemblies and expansion of middle assemblies are introduced to implement technique decomposition and process optimization of the assemble tasks on the critical path, so as to reduce the construction period of the complex block by 20% with the basic work schedule unchanged. When the design drawings and the data are produced, the result of the process optimization could be applied to the ship construction practice to reduce effectively the block construction period, and to improve both the production process design and production management ability.
Key words:complex product; assembly; critical path; process optimization
Market Analysis on 5000TEU Container Vessel
as a New Generation of the Largest Feeder
DENG Kai, YIN Xunbin
(1. CIMC Ocean Engineering Design & Research Institute Co., Ltd., Shanghai 201203, China;
2. CIMC Qianhai Financial Leasing (Shenzhen) Limited, Shenzhen, 518027)
Abstract:A 5000TEU container vessel is used as the research object to analyze the characteristics of the recent feeder routes and the performance of the fleet in operation, where the upsizing trend of the feeder trading market is taken into account to explore the upgrade potential and direction for the kind of container vessel. On this basis, it is proposed that the coming new 5000TEU container vessel can be defined as the largest feeder of the new generation.
Key words:feeder container vessel; main dimensions; regional routes; ports
Design and Analysis of Mooring System for a TLP
Engaged in Tender Assisted Drilling in West Africa Waters
JI Hengteng1, CHEN Guolong2, RAN Zhihuang1, LIU Tuanjie1, YE Wei1
(1.Offshore Tech China Co., Ltd., Shenzhen 518067, China;
2. CNOOC Research Institute Co., Ltd., Beijing 100028, China)
Abstract:This paper introduces the concept and history of Tender Assisted Drilling (TAD), and discusses briefly its characteristics and main application advantages. A Tension Leg Platform (TLP) is taken as the production platform and a proper semi-submersible drilling platform is chosen to assist the practice of TAD in West Africa Waters. The main dimensions of the TLP and the main performance data of the assisting platform are given, and the mooring system for TAD application is designed based on the general arrangements of the two platforms, which includes mooring lines of the assisting platform, the pulling lines of the TLP and the connection lines between the two platforms. Time domain coupled hydrodynamic analysis is performed for the two floating bodies during TAD, and two types of calculation conditions either with or without strong gusts are defined based on the characteristics of West Africa waters. The minimum distance between the two platforms, the maximum travel of the suspension bridge and the maximum tensions of each line are predicted based on the calculations, and the condition of one line broken is considered. The result shows that the design indicators can meet the requirements, and it is feasible for TLP platforms to be engaged in TAD in West Africa waters.
Key words:Tender Assisted Drilling (TAD); drilling assisting platform; Tension Leg Platform (TLP); West Africa waters; multi-body coupling motion analysis
A Research on the Wave Stability of
Prefabricated SEMI Floating Bucket Foundation
WANG Yue1, FU Xiya1, HE Wenkun2, LI Pengfei3, HAN Suyu1, WANG Hui1
(1. School of Civil Engineering, North China University of Technology, Beijing 100144, China;
2. Jiangsu Juxin Oil Pipe Co., Ltd., Yangzhou 225004, China;
3. Chongqing Jiaotong University, Chongqing 400074, China)
Abstract:In order to deal with the issue of wave stability in developing deep-water floating wind turbine piles, a structural form of triangular platform with four pontoons is designed. Wave load simulation test is performed in the wave basin to investigate the motion amplitudes and heeling angles of the tower column in the floating structure under different wave heights to analyze its wave stability. Frequency response analysis is performed using the hydrodynamic software AQWA. Characteristics of the surge and sway amplitudes and the vibration frequency of the model are obtained and compared with the experimental results. The result shows that the data agree with each other, and the numerical simulation result is helpful for understanding the hydrodynamic responses of wind turbines with floating foundations.
Key words:SEMI type; floating foundation; wave load; model test; vibration frequency
Strength Assessment of Launching Schemes for Asymmetric Semi-Submersible Crane Platform Without Cross-Bracing
ZHANG Kun, KONG Guozhao, LI Shaoze
(China Merchants Heavy Industry Jiangsu Co., Ltd., Haimen 226100, China)
Abstract:To solve the problem that the water in dock is not deep enough for the semi-submersible crane vessel to safely move out, this paper proposes two launching schemes and evaluates the change of hull structural strength during the launching process with the finite element analysis method. The result shows that the floating forces can be transmitted to the hull bottom through the sleepers offered in both schemes, and the pressure can be uniformly transmitted to the surrounding structures due to the elasticity of the sleepers, which is beneficial for the protection of the vessel. The maximum stress of hull bottom appears at the bulkhead supported by the sleepers, and the stress value is less than the allowable stress value. This study provides technical support and reference for the selection of safe and economical launching schemes by comparing the two different schemes and summarizing their advantages and disadvantages.
Key words:semi-submersible crane vessel; launching scheme design; asymmetrical and without cross-bracing; structural strength
Weight and COG Control Technology for Polar
Icebreaking Research Vessel
Li Xiaofeng, ZHAO Zhenhua, HAN Bingyang
(Jiangnan Shipyard (Group) Co., Ltd., Shanghai 201913, China)
Abstract:In order to solve the problem that the weight and Center of Gravity (COG) of the ship under construction does not match the design, it is necessary to have an effective weight and COG control for the whole design and construction process. This paper introduces the weight and COG control throughout the entire design and construction process of polar icebreaking research vesselXUE LONG 2, where the control objects are sorted out in advance, control measures are taken, allowable tolerances are properly assigned, exceeding tolerances are carefully dealt with, control scheme is strictly executed and dynamic execution during the whole process is carried out. All of these make the ship's weight and COG gradually approach the design values, and ensure XUE LONG 2 to meet the requirement of weight and COG control. As a conclusion, a complete and effective weight and COG control technology is summarized for the ship.
Key words:regression; design target; polar icebreaking research vessel; weight and COG; control technology
Application of Longitudinal Strength Direct Analysis in
Design of Ro-Ro Ship Superstructure
YE Xu, ZHAO Wenbin, HUA Kang, LIU Hongping
(Shanghai Merchant Ship Design and Research Institute, Shanghai 201203, China)
Abstract:This paper introduces a direct finite element calculation method to analyze the longitudinal strength of the transition area between the superstructure and the hull of Ro-Ro ship. Calculation analysis is carried out on the structure of transition area between superstructure shell and the hull with an autonomously developed program based on the rules of classifications and the existing researches, which shows the optimized structural form meets the regulations of the classification society. This study provides reference for the design of Ro-Ro ships where the longitudinal stress can be considered in the preliminary stage to avoid the large amount of subsequent revisions by proper arrangement. The autonomously developed program can add the global bending moment rapidly, thus increasing calculation efficiency.
Key words:Ro-Ro ship; global longitudinal strength; superstructure
Structural Design Features of 20000m3 LNG Bunker/Carrier
WEN Baohua, LIU Wenhua, CHEN Yanxi
(Shanghai Merchant Ship Design and Research Institute, Shanghai 201203, China)
Abstract:Based on the structural design of liquefied gas bunker vessels, this paper elaborates the features of a 20000m3LNG bunker vessel respectively on the still water bending moment design, the structural layout and design regulations, the hull temperature distribution calculation and steel grade selection, the typical saddle structure and anti-floating structure design. On this basis, finite element strength analysis and vibration and noise analysis are performed for the ship, and the key technology features of the structural design are summarized, which provides design references for liquefied gas vessels of the same type.
Key words:LNG carrier; LNG bunker; Type C independent tank; structural design; structure features
A Study on Vibration Reduction Technology of
Central Control Room on Polar Research Ship XUE LONG
ZHOU Yan1, XU Ning2, DONG Jiahuan1, ZHOU Haojie2, YE Linchang1, ZHU Weiwei1
(1. Shanghai Marine Diesel Engine Research Institute, Shanghai 201108, China;
2. Polar Research Institute of China, Shanghai 200136, China)
Abstract:There has been a large vibration inside the floor of central control room since the main engine and generator sets of polar research ship XUE LONG were replaced during the maintenance in 2013. After inspections and measurement analysis, the coupled vibration source that causes the excessive vibration in the central control room is found. Then vibration control measures are produced to the vibration source and its transmission path. The emission pipes are modified, the evaluation and optimization of the central control room structures are carried out and the damping treatment is implemented. Some improvement schemes are designed and optimized, and a feasible optimization scheme is formulated, which is tested in the sea trial and the result shows that the vibration in the central control room is well reduced, making the ship satisfying the highest comfort level of China Classification Society.
Key words:local vibration; modal analysis; vibration measurement; coupled vibration; central control room
A Modified Calculation Method for Submarine
Cable Reeling Parameters
HU Zhenwu, CHEN Shihai
(Shanghai Salvage, Ministry of Transport, Shanghai 200090, China)
Abstract:To accurately calculate the submarine cable reeling parameters of the cable laying plan, a relatively practical calculation method is proposed on the basis of two theoretical cable reeling parameter calculation methods. The comparison of three calculation methods shows that the proposed method is more accurate in calculating and validating the cable reeling parameters, which provides reference for the determination of cable reeling parameters and selection of relevant equipment in submarine cable laying engineering practices.
Key words:offshore engineering; submarine cable; cable reeling; cable reeling capacity
Design of Anchors and Chains for Ice-Going Ships
WU Wenxiang
(China Classification Society Wuhan Branch, Wuhan 430022, China)
Abstract:The method of bow anchor and chain design based on ship outfitting numbers has certain applicable premises that can hardly be satisfied under ice environment. Therefore, the design of anchors and chains for ice-going ships on the basis of the outfitting number method should be specially considered, where the key problem is to solve for the anchor chain loads under the combined action of wind, current, wave and sea ice. In order to effectively obtain the anchor chain loads in a convenient way, the combined wind, current, wave and sea ice physical model is simplified, and empirical formula are adopted to facilitate the calculation. Then the design scheme of the bow anchor and chains is created according to the anchoring demand of the ice-sailing ship, and the design reliability is validated through the design applicability assessment.
Key words:ice-going; anchor; chain; applicability assessment
RPD Measurement and Analysis on Truss Legs of
Wind Power Platform
XU Jinchu1, ZHANG Lei1, LI Yingqiang2
(1. CSSC Huangpu Wenchong Shipbuilding Co., Ltd., Guangzhou 511462, China;
2. Guangzhou Salvage Bureau, Ministry of Transport, Guangzhou 510260, China)
Abstract: Boththe Rack Phase Difference (RPD) and the Rack Phase Velocity (RPV) of the main chord racks on the same leg are measured manually and electronically during the whole lifting process of a wind power installation platform with truss type pile legs. On this basis, the variations of RPD value in the lifting process are analyzed to find out the influencing factors on the RPD value and to put forward the measures to control variation. This study provides reference for subsequent platforms of the same type to control RPD value, so as to improve the stability of lifting process.
Key words:truss type pile leg; pile leg strength; whole lift; Rack Phase Difference (RPD); control measures
Preparation of Super Hydrophobic and
Oleophilic Sponge Material and Oil-Water Separation
LU Fangfang, LI Cunjun, WANG Hairong, LI Liang, Ye Xianhuai, CHEN Jinghua
(Zhoushan Institute of Calibration and Testing for Quality and Technical Supervision, Zhoushan 316000, China)
Abstract:The commercial polyurethane sponge material is roughened by acid solution (sulfuric acid and chromium trioxide solution) before the super hydrophobic and oleophilic polyurethane sponge is prepared by the hydrolyzing and condensation reaction of methyltrichlorosilane. The uniformly covered polysiloxane layer on the composites surface creates its super hydrophobic and oil-wet characteristics. The average water contact angle of the composites is 162°±2°, and the oil contact angle is 0°. The oil-water separation test shows that the single-time oil-water separation efficiency of the oil-water mixture of gasoline, diesel oil, lubricating oil and edible oil is over 96%, and the single-time oil-water separation efficiency of diesel-water mixture is as high as 97.2%.
Key words:polyurethane sponge; super hydrophobic and oleophilic; oil-water separation
Data Inheriting Methods of Ship Digital Collaborative Design
Based on 3DEXP
SHAN Xiaofen, ZHU Yu, ZHU Minghua, LIU Yongzhen
(Jiangnan Shipyard (Group) Co., Ltd., Shanghai 201913, China)
Abstract:To deal with the issues of long R&D period and the difficulties in quality control caused by the unsatisfactory collaboration between design institute and shipyard including the tedious delivery process of two-dimensional drawings and the indirect data transmission and inheriting in the current ship design process, this paper analyzes the process of ship digital collaborative design and the way of data interaction based on 3DEXPERIENCE platform (3DEXP), and investigates in-depth the methods to create data receiving environment and data inheriting procedure, to support the delivery of 3D models from design institute to shipyard. The method has the advantage of integrity definition of 3D model to ensure the uniform data source, reduce design changes, improve the quality of ship design and shorten the development cycle.
Key words:3DEXPERIENCE platform; ship; digital; collaborative design; data inheriting
A Study on 3D Model Based Block Assembly Visualization
WANG Dawei, WANG Yixin, LI Xue, XU Dexi, HE Zhen, AI Houshuai
(Dalian Shipbuilding Industry Design & Research Institute, Dalian 116005, China)
Abstract:The 3D model based assembly visualization technology is studied to improve the design visualization technology of hull assembly for hull structure construction, and thus to guide the production effectively and to increase the production efficiency. This paper systematically clarifies the visualization design of hull assembly, including producing drawings based on work sequence, integrating drawing information, 3D visualization technology, the visualization system and the final in-site visualization design under complete digital environment, which provides reference for the collaborative expression of the assembly and installation drawings of other outfitting designs in hull construction, and lays foundation for the realization of complete 3D digital construction of ships.
Key words:3D; block assembly; visualization; core of intelligent manufacturing
A Study on Optimization of Large and
Complex Block Assembly Process
YU Yang, HU Chengcheng, YANG Keming, YUAN Lei
(Jiangnan Shipyard (Group) Co., Ltd., Shanghai 201913, China)
Abstract:To shorten the period of block manufacture and improve the block production capability, a critical path that affects the entire block manufacturing cycle is found by analyzing the typical hull segment construction process and sorting the urgency level of the work tasks. On this basis, the measures of separate construction of small assemblies and expansion of middle assemblies are introduced to implement technique decomposition and process optimization of the assemble tasks on the critical path, so as to reduce the construction period of the complex block by 20% with the basic work schedule unchanged. When the design drawings and the data are produced, the result of the process optimization could be applied to the ship construction practice to reduce effectively the block construction period, and to improve both the production process design and production management ability.
Key words:complex product; assembly; critical path; process optimization