Marine Technology - January 2008 - Page#24

<BODY> <span id="lblContents">and the presence of many islands that reflect Mr. Motta presented a three-tier approach the waves. which has been developed for the fatigue assessment: Tier I: Review of structural A lively discussion and reception followed details based on past experience and fatigue this very interesting presentation. assessment results by plan review engineers. Tier II: Rule-based fatigue strength "Attention to Structural Details - Critical to assessment and Tier III: Spectral fatigue Vessel Safety and Operational Efficiency" analysis for detailed verification. He then demonstrated applications of the above Harilaos N. Psaraftis approach to critical details. Mr. Luiz Motta, Engineering Manager of American Bureau of Shipping, Greece, provided a highly useful presentation entitled "Attention to Structural Details - Critical to Vessel Safety and Operational Efficiency" to 60 people who attended the Greek Section's England Section October Meeting (l to Akers, In Greece, the advancement of Operational second technical New England Section Chair and Dr. Richardr): Richardspeaker New Kimball, Oceanography was made possible with the meeting on Thursday, development of the POSEIDON marine November 8, 2007. Mr. Motta argued that the objectives of The author the owner, of the yard and of class, are not pointed out always aligned. He also outlined the structhat the drive tural design challenges facing the shipyard, for new con- which point out the fact that failure does s t r u c t i o n not always occur at locations one expects. efficiency Details of the Dynamic Loading Approach should be (DLA) and Spectral Fatigue Analysis (SFA) a c c o m p a - were also presented. nied by a greater A lively question-and-answer period with e m p h a s i s the audience followed Mr. Motta's talk, on struc- with a discussion on the details of the new tural integ- CSR rules and some concerns that these rity of criti- rules may result in ships of lower standards cal details. than the previous rules. A buffet reception Some symp- concluded this highly successful event. toms of such efficiency drive are NEW ENGLAND SECTION wider web Dinner cruise on Casco Bay Line's newGreek Section November Meeting (l to r): G. Anagnostou, Chairman Papers Committee; L. Motta, Author; H. Psaraftis, Section Chairman; N. Dionissopoulos, frame spac- est vessel, the 110 ft. 399-passenger ferry, Chairman Membership Committee ing, wider the AUCOCISCO III longitudimonitoring and forecasting system. Methods nal spacing, reduction in structural pieces, by Richard Akers and tools have been established, aiming at novel structural layouts and higher tensile the optimization and at increasing the effi- strength steels, etc. The fatigue requirements Members and guests of the SNAME New ciency of marine transportations and sea for Common Structural Rules (CSR) for England Section and of the ASNE NNE operations in both short-term (operational) tankers and bulk carriers are a necessary step Section took a dinner cruise on Casco Bay and long-term basis. The prediction of the forward by IACS to counter the potential Line's newest vessel, the 110' 399-passenexpected wave heights in the Greek seas adverse effects on fatigue performance of ger ferry, the Aucocisco III. The ferry was designed by Seaworthy Systems, Inc. of takes into account the small open fetches critical details. Essex, CT, and built at Steiner Shipyard in Bayou La Batre, AL. 24 SNAME NEWS data for description of past states, and time series showing trends and changes. Operational Oceanography proceeds by the rapid transmission of observational data to data assimilation centers, where numerical models produce forecasts for the wind and wave state. The outputs from the models are used to generate data products, especially useful in shipping and marine transportation, as e.g., warnings (of coastal floods, ice and storm damage, extreme wave events, etc.), electronic charts, optimization of ship routing, the rationalization of the decision about sailing suspension, the risk assessment of a ship taking into account the prevailing and forecasted wave conditions in her route, the optimization of search and rescue missions, information about the prevailing and forecasted wave conditions in the arrival harbor, etc. The final products and forecasts are then transferred (in near real time) to industrial users, government agencies, regulatory authorities and on-board sailing ships.</span> <br /> <br /> <a href="http://www.digitalwavepublishing.com/" title="Digital Magazine">Digital Wave Publishing</a> </BODY>