{"title":"Ice-Tank Observations on Barge Resistance in Brash-Ice","authors":"R. Ettema","doi":"10.5957/attc-1998-036","DOIUrl":"https://doi.org/10.5957/attc-1998-036","url":null,"abstract":"In many instances barges in ice-covered navigation channels must move through brash ice. The present paper presents ice-tank observations and data indicating the levels of resistance likely to be encountered by barges in brash ice. The ice-tank data are compared with a set of full-scale data obtained with barges moving through icecovered channels in the Mississippi River.","PeriodicalId":134628,"journal":{"name":"Day 2 Sun, October 25, 1998","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123702877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Kato, K. lzumiyama, S. Jones, W. Nixon, K. Sazaaov, G. Wilkman
{"title":"Recommended Measurement Procedures for Model Ice Properties","authors":"K. Kato, K. lzumiyama, S. Jones, W. Nixon, K. Sazaaov, G. Wilkman","doi":"10.5957/attc-1998-038","DOIUrl":"https://doi.org/10.5957/attc-1998-038","url":null,"abstract":"The proposed ITTC recommended procedures in measuring the elastic modulus, flexural strength, and specific weight of model ice are described. The basic theory is given, potential sources of error are identified, and comments are invited.","PeriodicalId":134628,"journal":{"name":"Day 2 Sun, October 25, 1998","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124182477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Physical Model Tests for Ship Manoeuvring in Ice","authors":"F. Williams, P. Waclawek","doi":"10.5957/attc-1998-037","DOIUrl":"https://doi.org/10.5957/attc-1998-037","url":null,"abstract":"Ore carriers navigating through ice filled channels and icebreakers escorting cargo ships are two examples of ships which must manoeuvre in ice. Information about the manoeuvring ability of such ships is required for ship design, for voyage planning, and for personnel training. With numerical simulation the eventual goal, physical model tests are an essential step in determining ship manoeuvring equations and parameters.\u0000 Simulation of ship manoeuvers in ice must take into account dynamics which are qualitatively different from those which control motions in open water. The constraining ice forces may be an order of magnitude larger than the corresponding hydrodynamic forces, and in fact are usually the limiting factors for ship operations in ice.\u0000 The usual Fourier methods used to determine hydrodynamic coefficients from open water PMM tests are not appropriate for ice manoeuvering analysis, for several reasons. The form of the manoeuvering equations in ice is different from that in open water. Runs in the ice tank are restricted in length, and the number of runs is restricted by the time and cost to produce an ice sheet. This paper outlines a new methodology for manouvering testing and analysis which takes into account both the complexity of the ship-ice interaction and also the requirement to obtain information in a cost-effective manner.","PeriodicalId":134628,"journal":{"name":"Day 2 Sun, October 25, 1998","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127696157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Data Acquisition System Used in JU-2000 Model Tests at University of New Orleans","authors":"R. Latorre, Rick Ashcroft","doi":"10.5957/attc-1998-035","DOIUrl":"https://doi.org/10.5957/attc-1998-035","url":null,"abstract":"Recently a series of tests of a 1/50 jack-up model in waves were completed using a portable data acquisition system at the University of New Orleans. The motion response of the model was measured in random waves and the test data extrapolated to provide full-scale predictions. The data acquisition for these wave induced motion tests consisted of a portable data acquisition system previously used for ocean transport monitoring. This system was modified for the model test program inputs. The successful completion of the tests showed the data acquisition system as reliable and user friendly system that enabled the test matrix to be completed in a relatively short period of time.","PeriodicalId":134628,"journal":{"name":"Day 2 Sun, October 25, 1998","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125411374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Gharib, D. Modares, F. Pereira, D. Dabiri, F. Taugwalder
{"title":"Three Dimensional Mapping of Bubbly Flows in Tow Tank","authors":"M. Gharib, D. Modares, F. Pereira, D. Dabiri, F. Taugwalder","doi":"10.5957/attc-1998-025","DOIUrl":"https://doi.org/10.5957/attc-1998-025","url":null,"abstract":"A unique three-dimensional imaging system for the purpose of mapping two-phase bubbly flows with applications in tow tanks is presented. A defocusing optical setup was implemented to generate images with imbedded information on the three-dimensional spatial position of bubbles. A novel approach was used to overcome the overcrowding of bubble images within a single camera, which had previously inhibited the practical application of this technique. A camera system based on the optical and spatial requirements was fabricated and tested. Special software was developed to map the three-dimensional position and to estimate bubble sizes and bubble number density within each captured image. The velocity fields are calculated from volumetric image correlation between each pair of consecutive images. Sample data and calibration results are presented in this paper.","PeriodicalId":134628,"journal":{"name":"Day 2 Sun, October 25, 1998","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121533997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Butt, N. Bose, I. Datta, Christopher D. Williams
{"title":"Mast/Snorkel Tests for the Dolphin Semi-Submersible AUV","authors":"M. Butt, N. Bose, I. Datta, Christopher D. Williams","doi":"10.5957/attc-1998-033","DOIUrl":"https://doi.org/10.5957/attc-1998-033","url":null,"abstract":"In 1997, the Institute for Marine Dynamics (IMD) together with International Submarine Engineering Research Limited (ISER) and Memorial University of Newfoundland (MUN) proposed to design and test a 1/2 scale surface-piercing mast for the DOLPHIN. This new mast was to be designed in such a way that it would assist in controlling vehicle roll. Another goal was to reduce the drag of the mast. A new mast was designed with a 25% plain flap over its lower-half and active air ejection over its surface-piercing upper-half. Both methods of control were tested in the 200m Towing Tank at IMD using a 0.516 scale model of the DOLPHIN. This work was carried out in late 1997 and early 1998 with funding from IMD, MUN and ISER. The results of some of these experiments are presented and discussed in this paper.","PeriodicalId":134628,"journal":{"name":"Day 2 Sun, October 25, 1998","volume":"21 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128304807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Measurements of Transient Flow Induced by a Berthing Barge in a Towing Tank","authors":"E. Huang, D. A. Davis, C. Kim, H. Chen","doi":"10.5957/attc-1998-031","DOIUrl":"https://doi.org/10.5957/attc-1998-031","url":null,"abstract":"A test program was conducted to collect essential experimental data required to validate a ship-berthing simulation model based on the Chimera RANS/freesurface technique. This technique has demonstrated a unique capability of describing critical features of the transient flow induced by a berthing ship. Validating experiments were conducted in a shallow water basin. A model barge was drawn transversely through calm water by a towing carriage toward a solid, vertical quay wall in a manner similar to a regular berthing process. The transier.t water flow induced by the moving barge was recorded with acoustic doppler velocity meters mounted on the barge and at six fixed locations within the basin. Flows leading, trailing, passing under the keel and around the ends of the barge were observed. The test parameters considered included approach speed, water depth and angle of approach. The flow pattern at the free surface was observed using floating ping-pong balls, while flow pattern at the bottom of the basin were observed using neutrally buoyant beads.\u0000 A number of noteworthy findings and observations relating to flow and reversal of flow are included in the remarks section of this paper. The model basin tests produced good comparisons between measured current velocity and water currents predicted by the simulation model. The large volume of water trailing the barge was shown to contribute significantly to the resulting berthing energy, especially in those runs where water depth was small compared to ship draft.","PeriodicalId":134628,"journal":{"name":"Day 2 Sun, October 25, 1998","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132796075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Experimental Investigation of Hull Lateral Force Distribution Using a Partly Captive Hydroelastic Model","authors":"D. Cumming, M. Mackay, Jindra Datta","doi":"10.5957/attc-1998-032","DOIUrl":"https://doi.org/10.5957/attc-1998-032","url":null,"abstract":"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 instrumentation included in IMD's horizontal Planar Motion Mechanism, and local shear forces, bending moments, and torques were measured at five locations along the instrumented elastic backbone of the segmented model. For modeling the maneuvering characteristics, interest centered on deriving the distribution of lateral force from these measurements. The test program consisted of varying the model static yaw angle and roll angle ( drift and heel) for a range of forward speeds in calm water at deep departure and operational light conditions. In most experiments the model was free to pitch and heave; however, the model was fixed in pitch and heave in a subset of the tests for comparison.\u0000 This paper gives a general description of the model design, instrumentation, backbone calibration procedure, data collected and analysis procedure. Representative results illustrating the distribution of lateral force for a number of test conditions are provided along with some observations on their potential for modeling the maneuvering behavior of long slender vessels.","PeriodicalId":134628,"journal":{"name":"Day 2 Sun, October 25, 1998","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127457262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Development of a New Large Amplitude Planar Motion Mechanism at IMD","authors":"D. Spencer, M. Williams","doi":"10.5957/attc-1998-026","DOIUrl":"https://doi.org/10.5957/attc-1998-026","url":null,"abstract":"A new multi-purpose planar motion mechanism bas been commissioned for use at the Institute for Marine Dynamics in St John's. The mechanism has the capability of being installed in either the clear water towing tank or the ice tank allowing for the first time maneuvering studies in ice to be made in a systematic manner. The paper describes the features of the PMM, its instrumentation, digital control system, and analysis techniques used.\u0000 The addition of the PMM compliments IMD's NAVSIM manoeuvring simulation software which is also briefly described. The PMM has a modular construction allowing it to serve multi-purpose applications in ice such as towing structures or buoys in curvilinear paths. The paper also describes a selection of conventional and nonconventional experiments conducted to date.","PeriodicalId":134628,"journal":{"name":"Day 2 Sun, October 25, 1998","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129411213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Broaching-To: A Proposed Definition and Analysis Method","authors":"M. Renilson, A. Tuite","doi":"10.5957/attc-1998-021","DOIUrl":"https://doi.org/10.5957/attc-1998-021","url":null,"abstract":"A non-linear mathematical model is developed to investigate the behavior of vessels operating in following seas. The effect of the position of the vessel in the wave on the maneuvering characteristics, the wave forces, the rudder effectiveness and the transverse stability is taken into account. 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.","PeriodicalId":134628,"journal":{"name":"Day 2 Sun, October 25, 1998","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133074943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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