Journal of Ship Production
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Published By The Society Of Naval Architects And Marine Engineers

8756-1417, 1542-0469

2009 ◽  
Vol 25 (04) ◽  
pp. 182-190 ◽  
Author(s):  
Jackyou Noh ◽  
Jong Gye Shin ◽  
Kwang Hee Ko ◽  
Jae An Chun

Automated line heating systems have been developed based on stand-alone operation with no consideration of the extensibility and maintainability. In the line heating shop, many of the line heating works are performed simultaneously; therefore, a collaborative and simultaneous automated line heating system is needed. In order to develop such a new line heating system, the current line heating process was analyzed, and then a distributed and automated process was determined, and the parts to be distributed and automated were identified to propose a distributed and automated line heating system based on modularization and network. Information and data flow from production design to robot control have been analyzed and integrated in the system. The system has two main processes: the calculation of the line heating information and execution of a working unit without calculation. A prototype of the system has been developed to study the feasibility of the system. Tests were carried out by using real production design data of a middle-sized Korean shipyard.


2009 ◽  
Vol 25 (04) ◽  
pp. 198-205
Author(s):  
George W. Ritter ◽  
David R. Speth ◽  
Yu Ping Yang

This paper describes a straightforward method for the design and certification of adhesively bonded composite to steel joints for the marine industry. Normally, certification is based on documented service at sea. Since these joints have not been previously deployed at sea, no data on their performance exist. Using an integrated combination of mechanical property evaluation and finite element modeling, the load- bearing capacity of a joint can be compared with the anticipated seaway loads. Calculated factors of safety for the sandwich design used here show that the joint has adequate strength to maintain structural integrity even after severe environmental exposure.


2009 ◽  
Vol 25 (04) ◽  
pp. 175-181
Author(s):  
Emerson C. Colin ◽  
Marcos M. O. Pinto

This paper presents an analysis of the historical and current asset turnover of several shipbuilding companies and regions, such being responsible for more than 50% of global production. Several turnover measures are used including, as inputs, main physical assets such as dock area, berth length, and lifting capacity; and as outputs, compensated gross tonnage (CGT), and the number of different ships produced. Data Envelopment Analysis is used to gauge the inputs and outputs of the companies in order to define their efficiency and identify the benchmarks in terms of asset usage. Results consolidated by region indicate that there are efficient companies producing in all of the regions studied: China, Europe, Japan, and Korea.


2009 ◽  
Vol 25 (04) ◽  
pp. 191-197
Author(s):  
Pankaj Biswas ◽  
N. R. Mandal

One of the most disturbing aspects in structural assembly is welding distortion. These deformations adversely affect the subsequent fit-up and alignment of the adjacent panels. The extent of distortion depends on welding parameters, plate thickness, thermophysical properties of plate material, structural restraints, and welding sequence. Because welding is a fully transient phenomenon, its numerical analysis is highly time consuming, and hence analysis of full-size ship structural panels is simply not feasible using conventional finite element (FE) analysis. The computational time depends on number of elements, type of analysis, number of load steps, and computer configuration. Actual simulation of welding, that is, transient elastoplastic thermomechanical analysis is computationally highly time consumable. In the present study, two different modeling approaches for welding distortion prediction are presented that show a drastic reduction in computational time. Finally, comparative studies are made among the transient elastoplastic thermomechanical analysis and two different equivalent techniques, that is, inherent strain method and transient cooling phase analysis for prediction of welding distortions of a stiffened plate panel.


2009 ◽  
Vol 25 (04) ◽  
pp. 214-220
Author(s):  
Saurav Dhiman ◽  
Biplab Datta

There was a sudden increase in the number of ship accidents in the early 1990s. The primary reason for these accidents was a combination of local corrosion, fatigue cracking, and operational damage. This paper establishes the need for corrosion protection and monitoring systems for marine vessels. An attempt has been made to estimate the market potential for such systems in the near future.


2009 ◽  
Vol 25 (04) ◽  
pp. 206-213
Author(s):  
Fang Dong ◽  
Hoda Parvin ◽  
Mark P. Van Oyen ◽  
David J. Singer

Operational flexibility is a powerful but complex strategy that is increasingly used in manufacturing and service industries. We introduce operational flexibility to ship production as a method to alleviate the effects of delays that ultimately create issues such as high cost, high variability in production workload, ineffective production control, and resultant low facility use. Our emphasis is on how incorporating a flexible curved block job shop can, with appropriate control/scheduling, increase the efficiency and timeliness of the block assembly process for both flat and curved blocks and enhance the robustness of the shipbuilding system. We formulate a stochastic model of our approach, as a flexible controlled queuing network in particular, and we provide a simulation test bed to quantify the value of this flexibility.


2009 ◽  
Vol 25 (03) ◽  
pp. 142-152
Author(s):  
Marcos M. O. Pinto ◽  
Emerson C. Colin

This paper presents an analysis of the ship purchasing process and suggests to shipbuilders a methodology to identify the attractiveness of different markets in terms of location. Two analyses are carried out to identify if there is any correlation between exporting country and buyer size (e.g., are Korean exports focused on large clients?) and if the location of the production influences the purchasing decision of the ship buyer. We created a purchasing preference index (PPI) that can be computed for each type of ship and each builder-buyer country pair, and the PPI distribution over several countries is used to evaluate the entry potential for each country which, made up from market size, defines a simple market attractiveness measure. Further analysis is performed aiming to investigate company-level characteristics, such as the size of the players and loyalty in the relationship builder-buyer.


2009 ◽  
Vol 25 (03) ◽  
pp. 126-135
Author(s):  
Jong Gye Shin ◽  
Young Joo Song ◽  
Dong Kun Lee ◽  
Jong Hun Woo

Recently, global shipbuilding companies have been increasing their productivity or expanding their shipyards to accommodate a large amount of orders. However, few studies have been carried out on shipyard layout designs. This research presents a simulation-based shipyard layout design framework to resolve the problems of the shipyard layout design. The shipyard layout design framework was developed on the basis of the systems engineering method. The disciplined systems engineering technique was guided by ISO/IEC 15288 during the planning phase of the shipyard layout design framework development. This framework suggests how to achieve an efficient and effective shipyard layout design that can satisfy the stakeholder of the layout design process. Furthermore, a method is recommended for how the proposed shipyard layout should be verified and validated using a computer simulation. It is expected that the framework will contribute not only to the improvement of the existing shipyard layout design but also to the construction of the new shipyard or ship-yard advancement.


2009 ◽  
Vol 25 (03) ◽  
pp. 161-167
Author(s):  
Charalambia Pylarinou ◽  
Nikos Karacapilidis ◽  
Emmanuel D. Adamides

Aiming to augment the quality of decision making in vessel dismantling, this paper presents an innovative decision support system that takes into account the diversity of the associated constraints to aid stakeholders handle issues such as the appropriateness of a disposal methodology or the level of safety in a dismantling yard. Being seamlessly integrated with an advanced simulation environment, the system also facilitates the collaborative design of dismantling processes.


2009 ◽  
Vol 25 (03) ◽  
pp. 168-173
Author(s):  
Ji Wang ◽  
Yujun Liu ◽  
Zhuoshang Ji ◽  
Yanping Deng ◽  
Yuanyuan Zheng

The hull job shop in a shipyard is a typical flexible manufacturing system (FMS), the flexibility and efficiency of which largely depends on the level of FMS scheduling. In this paper, the Object-Oriented Colored Petri Net (OOCPN) is used to build the FMS model for the hull job shop. A four-step modeling method of FMS has been developed to successfully simulate the scheduling of the hull job shop.


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