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Keywords: hull
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Proceedings Papers

Paper presented at the SNAME 30th American Towing Tank Conference, October 4, 2017
Paper Number: SNAME-ATTC-2017-0026
... TRACT Vertical acceleration measurements are often used to evaluate the “rigid body” response of a planing hull to hydrodynamic forces in waves. Unfortunately accelerometers respond to both the rigid body hull motions of interest and to unwanted vibrations, which if not addressed, produce...
Proceedings Papers

Paper presented at the SNAME 30th American Towing Tank Conference, October 4, 2017
Paper Number: SNAME-ATTC-2017-0025
... The resistance of a planing hull is known to be highly dependent on trim angle. For several reasons, trim is difficult to measure to the level of accuracy normally attained with other towing tank measurements such as resistance or speed. In a recent study intended to validate CFD methods...
Proceedings Papers

Paper presented at the SNAME 30th American Towing Tank Conference, October 4, 2017
Paper Number: SNAME-ATTC-2017-0045
... providing consistent outcomes as most cases reached resistance errors below 5%, with better adherence at lower speeds. knot mesh prototype numerical result simulation hull thickness ittc total resistance coefficient american towing tank conference resistance coefficient coefficient sinkage...
Proceedings Papers

Paper presented at the SNAME 30th American Towing Tank Conference, October 4, 2017
Paper Number: SNAME-ATTC-2017-0055
... The height of the intersection between the free surface and a ship hull is of interest for many naval architecture applications. For example, wave height at a station influences the probability of water on deck, and wetted elevation at a buttock on a transom influences resistance forces...
Proceedings Papers

Paper presented at the SNAME 30th American Towing Tank Conference, October 4, 2017
Paper Number: SNAME-ATTC-2017-0023
... Center, Carderock Division, (NSWCCD), United States Naval Academy (USNA) and University of Iowa have been comparing experimental results and CFD predictions of planing hulls. To obtain a comprehensive set of model scale experimental data for assessing of CFD tools, a representative planing hull...
Proceedings Papers

Paper presented at the SNAME 30th American Towing Tank Conference, October 4, 2017
Paper Number: SNAME-ATTC-2017-0017
... node ship new orleans hull coefficient nonlinear strip theory university marlante hull girder jensen strip theory model test forward perpendicular amplitude naval architecture equation head sea stiffness Dynamic global hull girder response is an important part...
Proceedings Papers

Paper presented at the SNAME 29th American Towing Tank Conference, August 11–13, 2010
Paper Number: SNAME-ATTC-2010-011
... the hydrodynamic studies have being done in support of this novel AUV design and development. vehicle shaft speed hull reynolds number effect propeller performance coefficient simulation vector underwater vehicle pitch test propeller correction body-fixed frame equation rudder rudder angle...
Proceedings Papers

Paper presented at the SNAME 29th American Towing Tank Conference, August 11–13, 2010
Paper Number: SNAME-ATTC-2010-004
... study of four (4) data sets as discussed in Grimsley (2009) and is now extended to an additional twenty-four (24) data sets collected from full-scale and model scale testing of different planing hulls. peak identification method test case gumbel distribution lognormal distribution hull...
Proceedings Papers

Paper presented at the SNAME 29th American Towing Tank Conference, August 11–13, 2010
Paper Number: SNAME-ATTC-2010-032
... A series of tow tank tests were performed to determine whether the added mass moment of inertia in roll and damping roll coefficient for a planing hull are frequency dependent. The model was forced in roll while running at planing speeds. The model was free to heave and pitch, but restrained...
Proceedings Papers

Paper presented at the SNAME 29th American Towing Tank Conference, August 11–13, 2010
Paper Number: SNAME-ATTC-2010-028
... The performance of three different shaped hulls was evaluated by experiments and computations to identify a hull form that provides low calm water resistance at cruise speed while remaining dynamically stable at high speed. The target cruise speed was at a length Froude number of 0.45...
Proceedings Papers

Paper presented at the SNAME 28th American Towing Tank Conference, August 8–10, 2007
Paper Number: SNAME-ATTC-2007-003
... hull Baseline 5.2 configuration. It was operated in the Chesapeake Bay at the Patuxent River Naval Air Station during the spring and fall of 2006. This paper discusses the two year NSWCCD technological effort. Specifically, it addresses the design, construction, instrumentation, and testing aspects...
Proceedings Papers

Paper presented at the SNAME 27th American Towing Tank Conference, August 6–7, 2004
Paper Number: SNAME-ATTC-2004-002
... This report considers the analytically predicted interference effects in a methodical series of 378 trimarans based on Series 64 hull forms. Wave interaction effects on drag were evaluated statistically to obtain a series of algebraic expressions for interference prediction based on form-related...
Proceedings Papers

Paper presented at the SNAME 27th American Towing Tank Conference, August 6–7, 2004
Paper Number: SNAME-ATTC-2004-001
... This paper presents the measured resistance of a trimaran model at the small towing tank at Dalhousie University, Canada. The towing tank has the dimensions of 30m x 1m x 1m. Experiments were carried out for a trimaran with various configurations of outrigger setbacks and hull spacings. Model...
Proceedings Papers

Paper presented at the SNAME 26th American Towing Tank Conference, July 23–24, 2001
Paper Number: SNAME-ATTC-2001-006
... associated with the system measurements is presented. Results of measurements on a waterjet-powered destroyer hull are presented. On this hull, velocity fields are shown ahead of the inlet, inside the inlet, and at the exit of the jet. Pitot tube measurements are combined with the velocity measurements...
Proceedings Papers

Paper presented at the SNAME 26th American Towing Tank Conference, July 23–24, 2001
Paper Number: SNAME-ATTC-2001-025
... and a systematic procedure for studying pitch-heave equilibrium. foil aft foil hull mbydro foil angle main foil angle control surface mitala marine transportation coefficient propulsor reynolds number maximum lift coefficient equation aft foil angle equilibrium lift coefficient waterline...
Proceedings Papers

Paper presented at the SNAME 25th American Towing Tank Conference, October 24–25, 1998
Paper Number: SNAME-ATTC-1998-006
... A wave-following towed planing vehicle operates in head seas, Sea State l and 2, at speeds in excess of l 6 knots (824 m/s). The as-built beam of the vehicle is either 4.25 in (10.8 cm) or 7.75 in (19.7 cm), for the two configurations; V-hull (deadrise pointing outboard) or catamaran (deadrise...
Proceedings Papers

Paper presented at the SNAME 25th American Towing Tank Conference, October 24–25, 1998
Paper Number: SNAME-ATTC-1998-007
... Research was conducted during the 1997-98 academic year into the porpoising of "V-hulled" planing craft. The purpose of the study was to first correlate the porpoising inception results published by 1952 Webb Institute seniors Day & Haag at a much larger scale, then advance porpoising...
Proceedings Papers

Paper presented at the SNAME 25th American Towing Tank Conference, October 24–25, 1998
Paper Number: SNAME-ATTC-1998-021
.... A full investigation into the behavior of vessels operating in following seas is hampered by the well known problem that the response of such a non-linear system is highly dependent on the initial conditions. plane figure 7 proposed definition international conference hull broach plane figure...
Proceedings Papers

Paper presented at the SNAME 25th American Towing Tank Conference, October 24–25, 1998
Paper Number: SNAME-ATTC-1998-010
... boat modification equation transom manometry assumption coefficient experiment vorus configuration transducer savitsky hull formulation geometry variation full scale planing experiment calculation FULL SCALE PLANING EXPERIMENT AND ANALYSIS Richard A. Royce University ofMichigan...
Proceedings Papers

Paper presented at the SNAME 25th American Towing Tank Conference, October 24–25, 1998
Paper Number: SNAME-ATTC-1998-032
... Experiments were carried out at the Institute for Marine Dynamics to determine the distribution of lateral forces and moments on a warship hull form with the objective of eventually modeling these components in a numerical maneuvering simulation. Total forces and moments were obtained from...

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