Mid-June
2005
Table
of Contents:
Pacific Northwest Section |
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New England Section |
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New York Metropolitan Section |
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Mid-June
2005
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Pacific
Northwest Section May 13, 2005 The May technical meeting took place on Friday, May 13, 2005, in North Vancouver, British Columbia. A total of 38 members and guests attended the meeting. The meeting began at 18:30 at the Cheers restaurant in North Vancouver with dinner followed by Mr. Mark Morgan’s presentation on Underwater Ship Repair. Mr. Morgan is the Director of Propeller Repair Operations at All Sea Enterprises Ltd., specializing in propeller underwater repair of large ships propellers. Since 1978 All Sea Enterprises Ltd. have been conducting underwater work for large commercial ships. During the past ten years they have developed and perfected new techniques for underwater ship repairs such as structural work, involving shell plating replacement and repairs, and mechanical repairs such as propeller modifications and repair and machinery installations (Ex: right angle drives or thrusters). In his presentation, Mr. Morgan provided details of work from past projects which included propeller re alignment, propeller edge modification, and design modifications to existing propellers in service.
One of All Sea’s recent developments is the “TRANSHAB” (the Transportable Habitat), which enables technicians to carry out underwater work in dry conditions, without the need to have the vessel in a dry dock. Recently All Sea Enterprises teamed with two companies to form Subsea Sulutions Alliance, a worldwide joint venture that provides underwater repairs to ships anywhere in the world. For more information visit www.subseasulotions.com . The presentation was accompanied by numerous interesting underwater photos and video showing the work performed underwater. The subject was very interesting to all the participants who brought up many interesting points of discussion after the presentation.
New
England Section May 19, 2005 On May 19, 2005, the New England Section meeting took place in Hampton Beach, New Hampshire, with a presentation by Donald MacPherson and Chad Turmelle, entitled “Inboard Propeller Cavitation: A Practical Guide and New Performance Model”. Mr. MacPherson began the presentation by describing the physics of cavitation, from why it happens, through where it begins, to where it disappears, noting that most propeller performance prediction models are for propellers in the sub-cavitating mode, and that there is very little data available for the trans-cavitating or super-cavitating modes. He then went on to describe a new prediction model, currently under development, that is specifically designed to account for the thrust and torque losses associated with operating in the trans-cavitating mode. The intention of the model is to provide a useful prediction tool for propellers typically used by the industry. The authors chose to develop a model that was less dependent on dimensional parameters in an effort to make it as widely applicable as possible. Mr.
MacPherson described the results and validation of the prediction model.
The model currently offers an acceptable prediction of torque losses but
is less accurate in the prediction of thrust breakdown. Mr. MacPherson
ended his presentation by describing the future development that is planned
for the new prediction model.
New
York Metropolitan Section June 8, 2005 The SNAME New York Metropolitan Section met at Stevens Institute of Technology for the annual Student Paper night on 8 June 2005. The meeting was jointly held with the New York section of ASNE. Incoming President Roger Compton was present along with several past presidents of SNAME.
Papers were presented by students of the US Merchant Marine Academy at Kings Point, Webb Institute of Naval Architecture and the Stevens Institute of Technology. The Kings Point students Peter Petricone and Michael Smith presented A Mathematical Model of a Gas Turbine about the modeling of gas turbine combustion processes to reduce NOx emissions. The paper focused mainly on the chemical and thermodynamic considerations of the combustion process rather than relying on post combustion processes.
The Webb Institute students Aristides Miroyannis and Emily Whitman presented The Effect of Stern Modifications on Resistance about the development and testing of a modern stern form for a Series 60 hull for improved wake flow and vibration characteristics. This was verified by model testing which included a three-dimensional wake survey.
The Stevens Institute students Soma Maroju and Michael F. DeLorme presented ACCeSS Design Tool-Performance Predition of Planing Hulls about the ACCeSS database development project of tank test data capture and neural network analyses using tank data from Stevens Institute and verification and testing from Webb Institute and University College of London. The Naval Surface Warfare Center (Carderock) (formerly David Taylor Model Basin) is expected to contribute additional data.
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