View non-flash version
April 2011www.sname.org/sname/mt (abstracts) On the In?uence of the Warping Shear Stress on the Hull Girder Strength BY A. CAMPANILE, M. MANDARINO, AND V. PISCOPO Published in the December 2010 Journal of Ship Research In this paper a new theory is proposed for the shear stress evaluation; new rela- tions have been obtained for the tangential stresses and the normal ones, generated by the shear force variability; a numerical method has been developed that gives the same values for the tangential stresses as the traditional shear stress theory and evaluates the normal stress eld, by a Ritz variational procedure. A numerical application of the developed method is carried out for a bulk carrier, obtaining an appreciable redistri- bution of the stresses, for the alternate holds loading condition, characterized by great values of the unit vertical shear. Transforming the Shipbuilding and Ship Repair Project Environment BY VICTORIA DLUGOKECKI, DENNIS FANGUY, LISA HEPINSTALL, AND DAVID TILSTROM Published in the November 2010 Journal of Ship Production and Design In April 2008, NSRP awarded the project entitled Customization of Web-Based Planning and Production Engineering Technologies to Support Integrated Shipyard Work Flow,? a collaborative research project that included Bollinger Shipyards and Atlantic Marine-Mobil. e purpose of the project was to develop and validate a project management approach to shipbuilding and ship maintenance through the delivery of a Web-based pro- duction and engineering management tool tailored to the needs of this industry along with a reliable, exportable imple- mentation process using planning and production engineering methodologies. is project was designed to enable ship- yards to achieve reduction in project costs and cycle time through project standard- ization and the ability to perform rapid replanning while maintaining alignment of all project stakeholders in real time. e project enabled the shipyards to bring forth quantiable improvement opportu- nities that reected the biggest impact on project delivery. is paper shares insight into the key ndings derived through this transformational body of research, as well as provide an understanding of the robust process used to implement the shipyard- specific Web-based project solutions in shipbuilding and ship repair project environments. e paper also provides a quantication and appreciation of the resulting cost benefits experienced by each of the participating shipyards. New construction programs in each of the shipyards enabled real-time metrics to be captured, illustrating the achievement of cost reduction opportunities resulting from this project. Development of the Decision- Making System for the Ship Block Logistics Based on the Simulation BY JONG HUN WOO, YOUNG JOO SONG, YONG WOO KANG, AND JONG GYE SHIN Published in the November 2010 Journal of Ship Production and Design Nowadays, the simulation technology aim- ing at preverifying continues to develop in the manufacturing industry. ough it is possible to apply simulation methodology to various fields in various methods, in particular, the computer simulation of the production system in the manufacturing industry is applied most extensively. Lots of shipyards have made continual stud- ies of the improvement plans on logistics operation of shipyards to cover the ship product constructed anew that consists of various ship types increasing day by day in the xed area of the yard in recent years. e block to form a ship, a transporter to transfer the block, and the jig that is the support of the block are related physically, and the planning and scheduling and the operating scheme of the distribution are related informatively in the logistics of the shipyard. We introduce cases to build the decision-making system with which one can perform the logistics verication on the planning and scheduling and the assessment of the quantitative eect of the changes of the shipyard layout. E"cient Method Based on Opti- mization and Simulation for the Probabilistic Strength Computation of the Ship Hull BY NADER M. OKASHA AND DAN M. FRANGOPOL Published in the December 2010 Journal of Ship Research e accurate computation of the strength of a ship hull is vital for ensuring its reliability. Taking into account the uncer- tainties in the material properties and fabrication details requires a probabi- listic approach for the determination of the strength of the ship hull. is study proposes an efficient approach for the determination of the probabilistic strength of the ship hull. First, a novel determin- istic method for the fast and accurate calculation of the strength of the ship hull is presented. In this method, stresses in the hull section are determined using the constitutive models of the stiened panels. ese models take into account the various possible failure modes and initial imper- fections. e ultimate strength is found by an optimization search algorithm. e method is shown to be as accurate as the rigorous incremental curvature method but with signicantly less computational time. e method is then applied with a Latin hypercube sampling simulation, and the output sample is tested against several potential distributions. e best-t proba- bility distribution of the ultimate strength of the ship hull is provided. MTSNAME Paper Abstracts continued