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The Deep Water Multi-Directional Wave Basin at the Offshore Technology Research Center 海洋技术研究中心的深水多向波盆
Day 1 Thu, June 11, 1992 Pub Date : 1992-06-11 DOI: 10.5957/attc-1992-033
R. P. Johnson
{"title":"The Deep Water Multi-Directional Wave Basin at the Offshore Technology Research Center","authors":"R. P. Johnson","doi":"10.5957/attc-1992-033","DOIUrl":"https://doi.org/10.5957/attc-1992-033","url":null,"abstract":"The Offshore Technology Research Center (OTRC) Deepwater, multidirectional wave basin, located in College Station, Texas, was commissioned in March of 1991. This model testing facility supports OTRC engineering science and research investigations into the unique challenges associated with deep-water operations. Scale model studies of wave kinematics and wave structure interactions in deep-water have been conducted.\u0000 The basin is 45.7 m x 30.5 m x 5.8 m. A 9.1 m x 4.6 m pit has an adjustable floor to allow depths from 5.8 m to 16.7 m. Forty-eight individually controlled, hydraulically actuated, hinged wave boards, located on one end of the basin, are used to generate regular, random, long-crested and short-crested seas. A progressive wave absorber consisting of variable porosity vertical screens is located opposite the wavemaker to minimize wave reflections.\u0000 Wave generation and data acquisition is accomplished using an integrated software package operating on a single workstation computer. Capabilities to simulate surface and sub-surface currents is currently being installed. Side wave absorbers and wind simulation capabilities are planned for installation next year. Video techniques will be developed to assist in measuring and characterizing short crested seas.","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124004925","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}
引用次数: 0
Repeatability of Resistance Experiments in Ice with a 1:20 Scale Model of the Canadian R-Class Icebreaker 加拿大r级破冰船1:20模型在冰上阻力试验的可重复性
Day 1 Thu, June 11, 1992 Pub Date : 1992-06-11 DOI: 10.5957/attc-1992-035
S. Newbury
{"title":"Repeatability of Resistance Experiments in Ice with a 1:20 Scale Model of the Canadian R-Class Icebreaker","authors":"S. Newbury","doi":"10.5957/attc-1992-035","DOIUrl":"https://doi.org/10.5957/attc-1992-035","url":null,"abstract":"A series of experiments was initiated at IMD's model ice basin to determine the experimental error that may be expected in the results of ice resistance tests. A set of nine ice sheets was dedicated to the study, in which a 1 :20 scale model of the R-Class icebreaker was tested in EG/ AD/S model ice. The test length for each model resistance test varied from one and one-half model lengths to two and one half model lengths for the higher velocities, as well as several tests through the full length of the ice sheet ( approximately 70 m). The test results were corrected to nominal ice conditions according to standard IMD procedures, and these results were then compared to determine the resistance variation.","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130680389","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}
引用次数: 1
Mathematical Simulation of Hovercraft Maneuvering 气垫船操纵的数学仿真
Day 1 Thu, June 11, 1992 Pub Date : 1992-06-11 DOI: 10.5957/attc-1992-040
G. Zilman, T. Miloh
{"title":"Mathematical Simulation of Hovercraft Maneuvering","authors":"G. Zilman, T. Miloh","doi":"10.5957/attc-1992-040","DOIUrl":"https://doi.org/10.5957/attc-1992-040","url":null,"abstract":"A mathematical model of a maneuvering amphibious air. cushion vehicle (ACV) is presented. The ACV, studied is of plenum-chamber type with constant pressure applied to the free-surface of the fluid. The main efforts of this paper are concentrated in clarifying the role and the significance of the hydrodynamical forces exerted by a moving pressure distribution. The general method of approach is illustrated by means of solving the titled problem for a schematic air-cushion planform close to the ACV SR.N2","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"292 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121086845","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}
引用次数: 3
Propeller Tip Cavitation Suppression Using Selective Polymer Injections 选择性聚合物注射抑制螺旋桨尖端空化
Day 1 Thu, June 11, 1992 Pub Date : 1992-06-11 DOI: 10.5957/attc-1992-023
G. Chahine, G. Frederick, R. D. Baseman
{"title":"Propeller Tip Cavitation Suppression Using Selective Polymer Injections","authors":"G. Chahine, G. Frederick, R. D. Baseman","doi":"10.5957/attc-1992-023","DOIUrl":"https://doi.org/10.5957/attc-1992-023","url":null,"abstract":"Selective injection of a drag-reducing polymer solution into the tip vortex region of the blades of an 11.5 inch diameter propeller is seen to be effective in significantly delaying tip vortex cavitation. For well positioned injection ports, the cavitation number at inception was decreased by as much as 35 percent. Injections of water and a mixture of water and glycerin for the same conditions did not affect the inception characteristics of the blades. Propeller thrust and lift were not affected at the selective polymer injection rate needed to affect the cavitation characteristics of the propeller.","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121542129","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}
引用次数: 0
Development Studies for a Six Degree-of-Freedom Marine Dynamic Test Facility 六自由度海洋动力试验装置开发研究
Day 1 Thu, June 11, 1992 Pub Date : 1992-06-11 DOI: 10.5957/attc-1992-029
M. Mackay, G. Unsworth, G. Panton, Y. Thériault
{"title":"Development Studies for a Six Degree-of-Freedom Marine Dynamic Test Facility","authors":"M. Mackay, G. Unsworth, G. Panton, Y. Thériault","doi":"10.5957/attc-1992-029","DOIUrl":"https://doi.org/10.5957/attc-1992-029","url":null,"abstract":"This paper outlines development studies for a large six degree-of-freedom dynamic test rig proposed for the IMD Clearwater Towing Tank. A full size pilot test rig, fully functional in the vertical plane, was built for this purpose. Tests were done on a static frame in air and water, using a 2 m long submarine hull model. A number of the principal test results are presented and discussed.","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131409690","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}
引用次数: 0
Calibration of the Wavemaker System in the Offshore Engineering Basin at the Institute for Marine Dynamics 海洋动力研究所海洋工程盆地造波器系统的标定
Day 1 Thu, June 11, 1992 Pub Date : 1992-06-11 DOI: 10.5957/attc-1992-026
J. Murray, L. Mak, M. Sullivan
{"title":"Calibration of the Wavemaker System in the Offshore Engineering Basin at the Institute for Marine Dynamics","authors":"J. Murray, L. Mak, M. Sullivan","doi":"10.5957/attc-1992-026","DOIUrl":"https://doi.org/10.5957/attc-1992-026","url":null,"abstract":"The wavemaker system at the Institute for Marine Dynamics (IMD) in St. John’s, Newfoundland was designed to simulate oblique regular and irregular waves as well as short crested waves, sometimes referred to as multi-directional waves. At present, the wavemaker system consists of 192 segments arranged in a J configuration. Mesh-type wave absorbers are installed on the remaining sides of the basin. Each segmented wavemaker can be operated in five modes of articulation to optimize its motion with respect to the type of waves being generated. The concept of this J design is to surround a model on three sides with controllable boundaries, thus providing a wider range of spreading angles in short crested waves. Consequently, these wavemakers must be capable of simultaneous wave generation and absorption. Initial calibrations of the wave generation system are now completed for regular waves and irregular uni-directional and multidirectional waves. Typical wave calibration results are presented in this paper. Results of preliminary investigations into wave absorption are also presented and discussed.","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123891027","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}
引用次数: 0
Experiments and Predictions of the Resistance Characteristics of a Wave Cancellation Multihull Ship Concept 消波多体船概念阻力特性试验与预测
Day 1 Thu, June 11, 1992 Pub Date : 1992-06-11 DOI: 10.5957/attc-1992-010
M. Wilson, C. Hsu, D. Jenkins
{"title":"Experiments and Predictions of the Resistance Characteristics of a Wave Cancellation Multihull Ship Concept","authors":"M. Wilson, C. Hsu, D. Jenkins","doi":"10.5957/attc-1992-010","DOIUrl":"https://doi.org/10.5957/attc-1992-010","url":null,"abstract":"This paper presents results of both analytical predictions and towing basin validation experiments for the basic resistance characteristics of a new small waterplane area, tri hull ship concept termed the Wave Cancellation Multihull (WCM). This is a variant of the O'Neill Hull form (OHF) type arrangement but which exploits extensive wave cancellation effects between the various hull elements: the center body, the center strut, and the two outer hulls. Significant reductions in total ship wave making resistance have been predicted in a high speed range normally associated only with fine form monohull ships. A tapered-strut-type center body shape bas been developed as an alternative to the original OHF center body and-strut configuration. Towing basin tests confirm the predictions of the thin ship theory wave making resistance variations. The resulting complete ship wavemaking resistance can be reduced to such an extent that the total resistance of a WCM ship geometry is comparable to that of a monohull at high ship speeds, despite the substantially larger wetted surface area. Summary comparison plots are presented for BHP/Displacement versus speed for several 4300 LT ship forms, including a candidate WCM arrangement.These show, for example, that at 30 knots it is possible to achieve a 28% reduction of effective horsepower with a realistic WCM configuration compared with the SWATH VII performance (best performing SWATH to date). It is also shown that the candidate WCM form bas about the same effective horsepower as a slim combatant monohull form at the speed in the neighborhood of 30-32 knots, despite 88% more wetted surface area.","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126430015","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}
引用次数: 12
Discussion of the Origins of the Frigate and the Sloop Constellation 论护卫舰和单桅帆船星座的起源
Day 1 Thu, June 11, 1992 Pub Date : 1992-06-11 DOI: 10.5957/attc-1992-038
K. Lynaugh
{"title":"Discussion of the Origins of the Frigate and the Sloop Constellation","authors":"K. Lynaugh","doi":"10.5957/attc-1992-038","DOIUrl":"https://doi.org/10.5957/attc-1992-038","url":null,"abstract":"Alleged to have been built in Baltimore, Maryland in 1797, the USS CONSTELLATION was transferred in 1955 to a group of Baltimore citizens for preservation and display. Initiating a protracted, vitriolic and public dispute, some maritime historians have claimed since 1947 that the ship presently exhibited is another warship with the same name built near Norfolk, Virginia in 1855. Has the ship had a continuous identity since 1797 or are those claims a mistake or a hoax? In March 1989 the U.S. Navy's Curator of Ship Models, situated at the David Taylor Research Center, located and identified in the Navy's vast collection, the 1853 designer's half hull model representing the design for a new CONSTELLATION. Further investigation by the Curator's office indicated that essentially all of the historical records cited, clearly substantiating the 1797 origin of the present ship, had probably been forged by a CONSTELLATION employee between 1956 and 1965. 1 (for a copy of the complete report \"FOULED ANCHORS\").","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129594747","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}
引用次数: 0
Interactions Between the Hull and Rudder During Ship Maneuvering 船舶操纵过程中船体与舵的相互作用
Day 1 Thu, June 11, 1992 Pub Date : 1992-06-11 DOI: 10.5957/attc-1992-004
P. Kopp, N. Fuller, R. Sedat
{"title":"Interactions Between the Hull and Rudder During Ship Maneuvering","authors":"P. Kopp, N. Fuller, R. Sedat","doi":"10.5957/attc-1992-004","DOIUrl":"https://doi.org/10.5957/attc-1992-004","url":null,"abstract":"Maneuvering experiments, sponsored by the U.S. Coast Guard, were performed in the rotating arm and linear towing tank facilities at the Carderock Division of the Naval Surface Warfare Center. The experiments investigated the effect of the hull on the inflow to the rudder, and the effect of the rudder on the forces on the hull. A 1/24th scale model of a MARINER Class ship was used. The average inflow angle to the rudder was determined, at various yaw rates and drift angles, by an unbalanced flat plate rudder that was free to seek a neutral angle. In separate tests, the rudder inflow velocity and angle were determined by pitot tubes mounted at four spanwise locations on the leading edge of a rectangular rudder. In other tests, hull forces and moments were measured with the rudder stock passing through the hull but not attached, and compared to similar data taken without the rudder. These tests were used to quantify the hull force differential due to the presence of the rudder.","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132702329","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}
引用次数: 0
A New Systematic Series of Planing Hulls 一个新的系统系列的计划船体
Day 1 Thu, June 11, 1992 Pub Date : 1992-06-11 DOI: 10.5957/attc-1992-039
G. Delgado, G. E. Lacy, C. Hsiung
{"title":"A New Systematic Series of Planing Hulls","authors":"G. Delgado, G. E. Lacy, C. Hsiung","doi":"10.5957/attc-1992-039","DOIUrl":"https://doi.org/10.5957/attc-1992-039","url":null,"abstract":"In the last few decades the performance of planing hulls has been researched by conducting model series such as, Series 62 [l]), Series 65 [2], Fridsma' s rough water series [ 3] , the Naval Academy Series [ 4 J , and the Dutch Series [SJ. However, the geometry of planing hulls has changed considerably from that tested in the above series, and consequently there is a need to provide designers and researchers with new performance data based on modern hull shapes. The Naval Architecture Program of the Technical University of Nova Scotia, in conjunction with the University's Centre for Marine Vessel Design and Research (CMVDR) is completing a program to design and test a systematic series of hulls representative of the modern-day planing craft.","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"193 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116392695","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}
引用次数: 0
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