Showing papers on "Shipbuilding published in 2020"

An overview of wire arc additive manufacturing (WAAM) in shipbuilding industry

Abstract: Increasing competition in the international shipbuilding industry pushes the naval architect’s pressure to reduce the costs of design and manufacturing of new buildings. Using newly developed Addit...

Sustainability challenges and how Industry 4.0 technologies can address them: a case study of a shipbuilding supply chain

Abstract: The shipbuilding industry is under significant economic pressure and in need of more efficient solutions to secure economically sustainable operations. It is also challenged by social issues and th...

Systems engineering and digital twin: a vision for the future of cruise ships design, production and operations

Abstract: Cruise ships are among the most complex and demanding products of the shipbuilding industry. The very special “payload” and exclusive operational profile, i.e. passengers looking for leisure and entertainment, imply outstanding performances in terms of safety standards and customer satisfaction. Attention to environment is relevant as well, since these ships are used to operate in spectacular marine ecosystems. The need of European shipyards to continuously progress to preserve the market leadership requires a virtuous evolution of the ship design process projected on a life cycle perspective. In this regard Systems Engineering appears to be a robust and reliable paradigm, able to provide the necessary comprehensive view of the cruise ship system as a whole together with a systematic methodological framework that, among the other advantages, enables the active and constructive participation of all the involved stakeholders in the decision-making process. In particular, Systems Engineering strongly relies on the so-called model-based engineering to share, integrate, combine and improve the level of details relevant to the system under development. In this paper the digital twin model will be discussed as a natural evolution of above-mentioned model-based engineering and its utilization in the shipbuilding field will be described as a very promising application especially in the field of cruise ships.

Trends of Digital Transformation in the Shipbuilding Sector

Abstract: The new paradigms of Industry 4.0 force all the industrial sectors to face a deep digital transformation in order to be on the edge in a competitive and globalized scenario. Following this trend, the shipbuilding industry has to establish its own path to adapt itself to the digital era. This chapter aims to explore this challenge and give an outlook on the multiple transformative technologies that are involved. For that reason, a case of study is presented as a starting point, in which the digital technologies that can be applied are easily recognized. A social network analysis (SNA) is developed among these key enabling technologies (KETs), in order to stress their correlations and links. As a result, artificial intelligence (AI) can be highlighted as a support to the other technologies, such as vertical integration of naval production systems (e.g., connectivity, Internet of things, collaborative robotics, etc.), horizontal integration of value networks (e.g., cybersecurity, diversification, etc.), and life cycle reengineering (e.g., drones, 3D printing (3DP), virtual and augmented reality, remote sensing networks, robotics, etc.).

Research on Collaborative Planning and Symmetric Scheduling for Parallel Shipbuilding Projects in the Open Distributed Manufacturing Environment

Abstract: In the current distributed manufacturing environment, more extensive enterprise cooperation is an effective means for shipbuilding companies to increase the competitiveness. However, considering the project scale and the uneven production capacity between the collaborative enterprises, a key issue for shipbuilding companies is to effectively combine the product-oriented project tasks and the specialized production-oriented plants. Due to information privatization, the decision-making process of project planning and scheduling is distributed and symmetric. Existing project scheduling methods and collaboration mechanisms in the shipbuilding industry are somehow inefficient. The aim of the research is to provide an assistant decision-making method to support effective task dispatching and multi-party cooperation for better utilization of the distributed resources and to help project managers control the shipbuilding process. The article initially establishes an agent-based complex shipbuilding project collaborative planning and symmetric scheduling framework, simulating the distributed collaborative decision-making process and bridging the multi-project planning with the individual project scheduling in much detail, which fills the research gap. A negotiation method based on iterative combination auction (ICA) is further proposed to solve the integration problem of project planning and task scheduling, and an illustrative example is conducted to demonstrate the effectiveness and rationality of the methods. Finally, an application case using a prototype system on shipbuilding projects collaborative planning and scheduling will be reported as a result.

Simulation-based planning system for shipbuilding

Abstract: To maintain the competitiveness of shipyards in the current, difficult situation, further improvements to technology are necessary. Recently, various production technologies have been developed to ...

Aalyzing and selecting the typical propulsion systems for ocean supply vessels

Abstract: The shipbuilding industry and marine economic services can be considered as one of the potential industries, a spearhead and an important motive of the marine economy in coastal countries. For serving the marine economy and being able to exploit marine resources, an enormous industry has been developed, using floating rigs, boats and fixed production platforms or anchoring on the sea. These floating structures require different types of support activities and to provide the necessary assistance, many different types of ships have been produced. The common function of offshore construction serving vessels are to support the fields of energy exploitation, continental shelf exploitation, oil and gas exploitation, geological survey and some other offshore industrials and services. Each type of ship can be designed to perform a single specific task, but in usal, each type of ship is designed to perform a combination of tasks. When integrating multiple tasks in one type of vessel, the designer must come up with the most suitable plan to satisfy the conflicting requirements, and must meet the operational requirements and the corresponding safety codes. This paper focuses on the analysis and selection of typical propulsion system such as hybrid propulsion with both the diesel propulsion and the electric propulsion with generators for several types of mainly offshore construction serving vessels. Access and expand information on vehicles and ships serving offshore construction, statistical methods, data processing combined with comparison and control to select the optimality typical propulsion system.

Analysis and evaluation of database for the selection of propulsion systems for tankers

Abstract: Tankers, bulk carriers and container ships are the three largest groups of ships in the global commercial fleet. This shows that the design and construction of these types of ships deserve special attention. The IEA said global oil demand data indicated the market was approaching a rebalancing of supply and demand. Even so, this rebalancing prospect is still uncertain because there is little evidence that oil inventories are falling as expected. Thus, the development of oil tanker fleet of the world in general and of Vietnam in particular is an inevitable and objective trend. The development and design of new models takes a lot of time, effort and money. In addition, doing this is not easy, due to objective and subjective reasons. Developing a ship model from the basic design stage requires a lot of factors, including time - a problem that is difficult to meet the needs of ship owners. In fact, the demand of ship owners is often met quickly and harmoniously at shipbuilding facilities. There, the development of new ships is based on the models of ships that have been built and verified. The parameters of the ship and the energy system are calculated based on experience and statistics. The results show that the ships developed in this way all meet technical issues, construction time, ship owners' needs and good operational efficiency. With the use of statistical and data processing methods to analyze, compare and control to build a database to serve the selection of the optimal propulsion system for tankers of a tonnage of over 5,000 dwt.

Application of a Wall-Climbing, Welding Robot in Ship Automatic Welding

Abstract: Feng, X.; Tian, W.; Wei, R.; Pan, B.; Chen, Y., and Chen, S., 2020. Application of a wall-climbing, welding robot in ship automatic welding. In: Gong, D.; Zhang, M., and Liu, R. (eds.), Advances in Coastal Research: Engineering, Industry, Economy, and Sustainable Development. Journal of Coastal Research, Special Issue No. 106, pp. 609–613. Coconut Creek (Florida), ISSN 0749-0208.Welding is the key technology in modern ship-construction engineering, which has always been the technical difficulty for all countries worldwide. There are a large number of welding processes in the manufacturing and maintenance of ships. Therefore, to alleviate some problems, such as shortening the shipbuilding cycle, improving the quality of ships, and reducing the labor intensity of workers, the application of new welding technologies must be promoted as the future developmental direction of ship welding. Ship automatic welding has become the main trend. Welding robots have many advantages, such as high flexibility, strong adaptability, and so on. In the 1980s, Japan began to try the application of a wall-climbing, welding robot and achieved good results. By improving the ship-welding equipment technology, the rapid development of the ship industry can be promoted, which will improve the application of automatic welding. This article mainly studies the application of wall-climbing robots in ship automatic welding, which has an important role in the research of ship-welding technology.

Testing Autonomous Systems

Abstract: The development of autonomous vehicles is currently being promoted massively, not least in the German automotive industry, under very high investments. The railway industry, shipbuilding, aircraft industry, and robot construction are also working on further developing their products (trains, ships, drones, robots, etc.) into self-driving or autonomous systems.

Ships’ Pumps: From Antiquity to the Early Modern Era

Abstract: One of the few facts that can be stated unequivocally is that wooden vessels leak. Whether due to a damaged hull, loose caulking between seams, or simply a reflection of the age of a ship, water always manages to end up in the bilge. Sailors on smaller watercraft addressed this issue through bailing, but as ships became larger, the demand for an efficient device eventually produced the ships’ pump. Over most of history, contemporary scholars paid little attention to describing the device and it is only in the last few decades that archaeologists have begun to piece together the various versions of ships’ pumps found on several shipwrecks. This article addresses earlier analyses on ships’ pumps and expands upon the topic with new archaeological findings. It also discusses the relationship between the hull design and where shipbuilders positioned the pumps within the hold.

A Process-Based Modeling Method for Describing Production Processes of Ship Block Assembly Planning

Abstract: Ship block assembly planning is very complex due to the various activities and characteristics of ship production. Therefore, competitiveness in the shipbuilding industry depends on how well a company operates its ship block assembly plan. Many shipbuilders are implementing various studies to improve their competitiveness in ship block assembly planning, specifically regarding technology usage, such as modeling and simulation (M&S) and Cyber-Physical Systems (CPS). Although these technologies are successfully applied in some production planning systems, it is difficult to tailor ship production planning systems with flexibility due to unexpected situations. Providing a flexible plan for these production planning systems requires a way to describe and review the organic relationships of ship production processes. In this research, a process-based modeling (PBM) method proposes a novel approach to describing the production process of ship block assembly planning by redefining production information based on changing instructions. The proposed method consists of four modeling steps. The first creates a unit model, which includes the products, processes, and resource information for the block. The second designs an integrated network process for linking unit models according to the bill of materials (BOM). The third creates a process-based model that describes the production processes by combining unit models. The fourth generates a simulation model by applying a Petri-net to the process-based model, which analyzes the productivity of the ship’s block assembly processes. PBM identifies the assembly process’ interrelationship and shows that productivity can be reviewed to uncover ship production problems.

Hybrid Expert System for Computer-Aided Design of Ship Thruster Subsystems

Abstract: The article presents an expert system supporting the design of ship’s power subsystems, in particular the thruster subsystem. The proposed hybrid expert system uses the results of simulation tests as the additional source of knowledge. The results of system operation are collated in a report which can be used as part of ship design description. The work oriented on developing the expert system is the continuation of the research carried out in cooperation with the shipyard’s design office, the main aim of which was to automate selected stages of the ship’s design process. The hybrid expert system for computer-aided design of ship thruster subsystems can support designers by creating part of the technical description of the thruster subsystem, evaluation of static and dynamic properties, and by checking if design solutions have met the requirements of classification societies. Additionally, the expert system supports collecting and providing information about the elements and structures of the thruster subsystem. Finally, the system provides a document with the description of the thruster structure and elements used in it. The proposed expert system is dedicated to the initial design stages.

A Resource Optimization Allocation Strategy for China’s Shipbuilding Industry Green Innovation System

Abstract: In order to realize the resource optimization allocation in the green innovation system of China’s shipbuilding industry under the internet environment, to improve the level of green innovation and...

Research on typical application of intelligent shipbuilding based on 5G communication technology

Abstract: According to the requirements of multi-element comprehensive management on general assembly of shipyard and the construction of 5G communication technology, combined with the new mode of intelligent manufacturing, the technical research on real-time monitoring of molten pool state, dynamic identification and warning of personnel behavior and operation specification, visualization of 3D model field operation guidance, and state monitoring of welding machine are carried out. Based on 5G communication technology, a series of scenarios were completed, which has low delay, high reliability, high traffic density and high mobility. Combined with artificial intelligence discrimination technology, the comprehensive management and control system of ship assembly workshop was developed to realize the auxiliary decision-making on welding quality, human and machine status recognition, and it is demonstrated and applied in large ship assembly construction site.

Problem of using electrodes made of shipbuilding steel to protect ship hull from corrosion

Abstract: The article discusses the problem of corrosion that causes significant damage to the ship structures and mechanisms, reducing their service life. The experience of using different electrodes to control the electrochemical protection systems of steel hulls of auxiliary vessels is presented. The results of corrosion tests of PM-15 ship hull are presented, which included measurements of the hull potential at a given control point, using an electrical measuring device and two control electrodes. As the first electrode used an electric carbon product for electric machines. A ship hull steel plate was used as the second electrode. The investigated vessel stayed at the pier for a long time. Corrosion tests were carried out in the period within 10.10.2019-16.10.2019. The ship hull potential at the control point was controlled using 50 parallel measurements. Parallel measurements were performed with a specified time interval of 5 sec. between them. A qualified operator has been trained to perform corrosion studies. The accuracy of the measurements was determined on the basis of current regulatory documents. The test results show that the reliability of the control of electrochemical protection systems of the hull primarily depends on the type of electrode used. It has been demonstrated that the metrological characteristics of the results of control measurements depend on the period of using a steel plate. The results of scientific research help to select the right elements of the system of monitoring the effectiveness of electrochemical protection of the ships and ship crews.

Ship Maintenance and Repair Services in the Tema Drydock and Shipbuilding Yard in Ghana: Some Challenges, Opportunities and Prospects

Abstract: This article explored existing policies (if any) and current management structure which govern operations within the yard, examine some major challenges facing the ship maintenance and repair services in Tema Drydock and Shipbuilding Yard, Ghana, identified few drivers that impact positively on the ship repair market with particular reference to the Tema Shipyard. It concludes by proposing sustainable management and maintenance strategies for improved repair services of the yard as well as analyzing the findings obtained in the data presentation and discussion sections during the research project. The main finding is that the PSC Tema Shipyard’s ship maintenance and repair services are really overwhelmed with major challenges, representing 55% after summing up four (4) out of the seven (7) captured in the study and are threatening its sustainability, if not properly researched and addressed once and for all. As already stated, carefully analysed conclusions were drawn to effectively address these challenges, followed by suggestions for future research to forestall its cascading effects on the Ghanaian economy as a whole.

Research on Digital, Networked and Intelligent Manufacturing of Modern Ship

Abstract: The development of ship intelligent manufacturing is divided into three stages of digital, networked and intelligent manufacturing. In the digital manufacturing stage, shipbuilding enterprises strengthen the relationship between manufacturing and design to improve the efficiency of manufacturing. In the networked manufacturing stage, shipbuilding enterprises use the internet of things technology to improve the controllability in the production process and effectively enhance the coordination and cooperation between machines and persons. In the intelligent manufacturing stage, shipbuilding enterprises let the new generation of artificial intelligence technology run through the design, management, service and production, greatly improving the flexibility of manufacturing. This paper studies the application model of industrial design system in ship design, the application model of internet of things technology in the production control of shipbuilding enterprises, and the application model of new generation artificial intelligence technology in intelligent decision support, which makes a preliminary exploration for the intelligent development of shipbuilding enterprises.

Geometry of real objects in shipbuilding and ship repair

Abstract: The article considers the modern engineering practice of designing and manufacturing that uses various analytical and graphic forms representing geometric objects. Both of these forms are characterized by the presence of two problems in terms of production practice: 1 - tools of modern geometry cannot operate with non-ideal forms and configurations of material objects; 2 - lack of methods and tools for describing patterns of generating geometric objects, from production lines to the structure that characterizes the relative location of surfaces. The generalized provisions of the geometry of non-ideal objects theoretically justified for formal synthesis and their elements have been presented, which avoids problems of geometric configuration in the practice of designing and developing manufacturing technologies in shipbuilding and ship repair. A special toolkit based on discrete mathematics is proposed for the formal description of the geometric configuration of non-ideal objects. The principles of geometry of real objects describe the structural-parametric representation of objects in a six-dimensional space that is defined by linear and angular vectors. The concepts of linear and angular vectors are analyzed. It has been stated that the presence of an angular vector simplifies the perception and makes easier calculating the processes of geometric transformations. A geometrical object refers to a closed subspace bounded by a single surface, a set of mating or intersecting surfaces. The examples of the real plane deviations from its reference, location of the planes for creating the ideal geometric configuration, variants of real images, forming the basis for six-dimensional space, structure of geometric configurations have been illustrated. It has been found that any specific part acting as a geometric object can be represented by a set of surfaces and the structure of their relationships, which contributes to the correctness of its manufacture. The use of six-dimensional space allows to describe the spatial geometric configurations of parts of various mechanisms with mathematical accuracy.

Analisa Perhitungan Pekerjaan Reparasi Kapal Dengan Metode Critical Path Method (CPM): cpm

Abstract: Meranti Nusa Bahari carries out two types of businesses, firstly ship repair and secondly ship building services. Technical analysis of ship repair work using a simple table method. The purpose of this research is to find out how long the ship repairs. The method used is CPM (Critical Path Method). The results of this research are technical analysis of work using a simple table that is able to repair one unit of ship within 22 working days and 20 ships in a year. While the analysis with CPM method found 18 working days per unit of ship and 25 units of ships in a year. There has been a decrease in working time per ship unit of 4 working days which can be used to work on other vessels, with an increase in the number of vessels of 4~5 ships in a year where there is an increase in repair productivity by 20%.

Development of Offshore Engineering Equipment and High-end Shipbuilding Industry: A Case Study of Dinghai District, Zhoushan, Ningbo

Abstract: Huang, C. and Zheng, W.X.J., 2020. Research on the development of offshore engineering equipment and high-end shipbuilding industry: A case study of Dinghai District, Zhoushan, Ningbo. In: Guido Aldana, P.A. and Kantamaneni, K. (eds.), Advances in Water Resources, Coastal Management, and Marine Science Technology. Journal of Coastal Research, Special Issue No. 104, pp. 700–704. Coconut Creek (Florida), ISSN 0749-0208.The 21st century is the century of the oceans, and speeding up the development and utilization of marine resources has become the strategic orientation of economic development of all countries in the world. Marine engineering equipment refers to the general term for various mechanical equipment needed in the course of a series of marine economic activities. And high-end ships, because of their complex design and manufacturing processes and powerful functions, occupy a very important position in the marine equipment industry chain, and have extremely high research and application value. The development of marine engineering equipment and high-end shipbuilding industry can realize the wider application and development of marine resources. Therefore, this article analyzes the development model of Korean marine engineering equipment and high-end ship manufacturing industry, and uses Ningbo Zhoushan Dinghai District as a focus area to conduct a matching analysis, in order to provide suggestions for the development of marine engineering equipment and high-end ship manufacturing industry.

Floating Shipyard Design: Concept and Application

Abstract: Shipyards often incorporate floating structures as elements within their facilities, for example floating docks for drydocking vessels requiring repairs or maintenance and pontoons to provide berths for smaller support vessels, such as tugs and workboats. However, the concept of a shipyard comprised exclusively of floating structures is considered herein. Floating shipyard facilities are particularly suitable for locations with naturally deep water, where floating structures may be more economical due to lower capital construction costs relative to land based facilities (e.g. floating docks versus graving docks). Similarly, fabrication of floating structures can be conducted off site, often benefiting from modular construction and providing more economical solutions relative to in situ construction. In addition, modular approaches to aspects such as power production may be incorporated, e.g. using modular power plants on floating barges. For appropriate operational conditions within the yard facility and acceptable downtime, relatively tranquil metocean conditions are required at the site, i.e. limiting structural movements for the benefits of equipment (e.g. cranes) and personnel. As such, typical suitable locations will be either naturally sheltered or provided with adequate breakwaters. Benefits of such a floating shipyard include the flexibility to more readily adapt the facility when required and potentially re-locate all or part of the shipyard if required due to changes in market conditions. Floating shipyards are likely to be more suitable for ship repair and not for shipbuilding, which typically requires more extensive workshop and assembly areas. In addition to an overview of the floating shipyard concept, relevant examples are provided from an ongoing project under development in a remote location in Angola, West Africa, that is ideally suited to the concept.