This paper presents a summary of the results of a study of the parametric interrelationships between size, weight, hull proportions, propulsion power, and craft speed of modern, high performance, monohull marine craft. The objective of the study was to derive an empirical method for: i) expeditious definition and optimization of hull geometry, and propulsion plant of candidate craft concepts, and ii) assessment of performance claims in boat design proposals and similar technical literature. Parametric relationships were derived to describe the performance characteristics of high speed craft in terms related to lifting surface theory (i.e aspect ratio and pressure loading of the planing surface) rather than in more conventional "naval architectural" terms such as hull geometry coefficients, slenderness ratio etc. The data provide a fast and convenient method for estimation of propulsion power/speed relationships which requires only limited craft design information and yields results consistent with the precision necessary for the intended usage. The scope of the paper includes a brief review of the technical approach used to accomplish the work, typical data trends and the charts which provide the basis for the simplified power estimation method. Performance estimates derived by means of the method are compared with data derived from the careful and thorough testing of full-scale craft.
{"title":"A Simplified Power Estimation Method for Monohull High-Speed Small Craft","authors":"C. Lee","doi":"10.5957/attc-1992-044","DOIUrl":"https://doi.org/10.5957/attc-1992-044","url":null,"abstract":"This paper presents a summary of the results of a study of the parametric interrelationships between size, weight, hull proportions, propulsion power, and craft speed of modern, high performance, monohull marine craft. The objective of the study was to derive an empirical method for: i) expeditious definition and optimization of hull geometry, and propulsion plant of candidate craft concepts, and ii) assessment of performance claims in boat design proposals and similar technical literature.\u0000 Parametric relationships were derived to describe the performance characteristics of high speed craft in terms related to lifting surface theory (i.e aspect ratio and pressure loading of the planing surface) rather than in more conventional \"naval architectural\" terms such as hull geometry coefficients, slenderness ratio etc. The data provide a fast and convenient method for estimation of propulsion power/speed relationships which requires only limited craft design information and yields results consistent with the precision necessary for the intended usage.\u0000 The scope of the paper includes a brief review of the technical approach used to accomplish the work, typical data trends and the charts which provide the basis for the simplified power estimation method. Performance estimates derived by means of the method are compared with data derived from the careful and thorough testing of full-scale craft.","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"73 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":"127375925","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}
Recent simulation testing of existing and proposed improvements to the Houston Ship Channel (HSC) in Galveston Bay has demonstrated the need for additional information on the behavior of ship maneuvering and passing in very restricted waterways. Modeling based on towing tank tests for bank/ship and ship/ship interactions had to be seriously modified for the ships to respond as the pilots indicate ships behave in the HSC. Comparison with scale physical models indicates that these modifications do produce ship motions similar to those measured with the free-running physical models. Prototype measurements also indicate the behavior is being reproduced with the revised simulator model. This suggests the need for new and better methods for determining ship behavior in highly restricted waterways that can account for the free motion of the ship.
{"title":"Modeling Realistic Ship Behavior in Highly Restricted Waterways","authors":"L. Daggett","doi":"10.5957/attc-1992-003","DOIUrl":"https://doi.org/10.5957/attc-1992-003","url":null,"abstract":"Recent simulation testing of existing and proposed improvements to the Houston Ship Channel (HSC) in Galveston Bay has demonstrated the need for additional information on the behavior of ship maneuvering and passing in very restricted waterways. Modeling based on towing tank tests for bank/ship and ship/ship interactions had to be seriously modified for the ships to respond as the pilots indicate ships behave in the HSC. Comparison with scale physical models indicates that these modifications do produce ship motions similar to those measured with the free-running physical models. Prototype measurements also indicate the behavior is being reproduced with the revised simulator model. This suggests the need for new and better methods for determining ship behavior in highly restricted waterways that can account for the free motion of the ship.","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"212 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":"122111772","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}
A new tool for flow field measurement is in use at the David Taylor Model Basin (DTMB) The Digital Particle, Image Velocimetry (DPIV) technique developed by Willert and Gharib (1) has been used to measure the flow fields of a 2D standing wave and of a laminar vortex pair interacting with 2D traveling waves at a free surface. Application of the DPIV technique to free surface flows introduces new measurement challenges a the position of the non-stationary surface is not known a priori, but must be determined from the video images themselves. The initial application of the DPIV technique at DTMB has shown that it is a useful tool for flow field measurement and visualization with a high throughput rate. It is possible to obtain flow field measurements in almost rea1 time, and the results are immediately available for use in directing experimental efforts. It is envisioned that a myriad of applications will be found for the DPIV technique at DTMB, including the mapping of flow fields around hull forms, appendages, and propulsors.
David Taylor模型盆地(DTMB)使用了一种新的流场测量工具。Willert和Gharib(1)开发的数字粒子图像测速(DPIV)技术已被用于测量自由表面上二维驻波和与二维行波相互作用的层流涡对的流场。DPIV技术在自由表面流动中的应用带来了新的测量挑战，非静止表面的位置不是先验的，而是必须从视频图像本身确定。DPIV技术在DTMB的初步应用表明，它是一种有用的流场测量和可视化工具，具有高通量。几乎可以实时获得流场测量结果，并且结果可立即用于指导实验工作。预计DPIV技术将在DTMB得到广泛应用，包括船体形状、附件和推进器周围的流场映射。
{"title":"Flow Field Measurements at a Free Surface Using Digital Particle Image Velocimetry","authors":"J. Hamilton, S. Fish, D. Anthony","doi":"10.5957/attc-1992-025","DOIUrl":"https://doi.org/10.5957/attc-1992-025","url":null,"abstract":"A new tool for flow field measurement is in use at the David Taylor Model Basin (DTMB) The Digital Particle, Image Velocimetry (DPIV) technique developed by Willert and Gharib (1) has been used to measure the flow fields of a 2D standing wave and of a laminar vortex pair interacting with 2D traveling waves at a free surface. Application of the DPIV technique to free surface flows introduces new measurement challenges a the position of the non-stationary surface is not known a priori, but must be determined from the video images themselves.\u0000 The initial application of the DPIV technique at DTMB has shown that it is a useful tool for flow field measurement and visualization with a high throughput rate. It is possible to obtain flow field measurements in almost rea1 time, and the results are immediately available for use in directing experimental efforts. It is envisioned that a myriad of applications will be found for the DPIV technique at DTMB, including the mapping of flow fields around hull forms, appendages, and propulsors.","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"12 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132285753","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}
Numerous methods for calculating wave reflection have been presented in the literature. These methods utilize the recorded wave heights from two or three probes and, in some cases, the phase relationship between the wave probes. The present paper discusses three of the calculation methods and the difficulties encountered in applying the methods to "real" wave tank conditions. Results are presented for the wave reflection from the beach of a two dimensional wave tank, and recommendations are presented concerning the most appropriate method.
{"title":"Comparison of Wave Reflection Equations with Experimental Wave Basin Data","authors":"D. Cotter, S. Chakrabarti","doi":"10.5957/attc-1992-009","DOIUrl":"https://doi.org/10.5957/attc-1992-009","url":null,"abstract":"Numerous methods for calculating wave reflection have been presented in the literature. These methods utilize the recorded wave heights from two or three probes and, in some cases, the phase relationship between the wave probes. The present paper discusses three of the calculation methods and the difficulties encountered in applying the methods to \"real\" wave tank conditions. Results are presented for the wave reflection from the beach of a two dimensional wave tank, and recommendations are presented concerning the most appropriate method.","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"32 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":"114490275","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}
The model to full scale correlation in resistance and powering between two scale model USMC waterjet propelled high speed amphibious vehicles is shown. The estimated required thrust for a 0.295 scale model of the High Water Speed Technology Demonstrator and a 0.245 scale model of the Propulsion System Demonstrator are compared to full scale results in a speed range of 5 to 30 knots. Correlation above 22 knots, after correction for air ingestion into the waterjets, is found to be excellent The effects of air ingestion into the waterjets, effect of long time constants to reach steady state, and an apparent hysteresis effect due to acceleration are also discussed.
{"title":"Correlation of the USMC High Speed Technology Demonstrator and Propulsion System Demonstrator","authors":"J. Hoyt, B. Abramson, D. D. Hayden","doi":"10.5957/attc-1992-042","DOIUrl":"https://doi.org/10.5957/attc-1992-042","url":null,"abstract":"The model to full scale correlation in resistance and powering between two scale model USMC waterjet propelled high speed amphibious vehicles is shown. The estimated required thrust for a 0.295 scale model of the High Water Speed Technology Demonstrator and a 0.245 scale model of the Propulsion System Demonstrator are compared to full scale results in a speed range of 5 to 30 knots. Correlation above 22 knots, after correction for air ingestion into the waterjets, is found to be excellent The effects of air ingestion into the waterjets, effect of long time constants to reach steady state, and an apparent hysteresis effect due to acceleration are also discussed.","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"28 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":"115302993","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}
This paper describes a series of experiments relating to the manoeuvring of the 22 tonne SWATH fishing vessel ALI. The results are related to the output of a manoeuvring prediction program resulting from the adaptation of monohull manoeuvring techniques to SWATH ships.
{"title":"On the Full Scale Maneuvering Characteristics of the SWATH Fishing Vessel Ali","authors":"R. Mcgregor, A. F. Miller","doi":"10.5957/attc-1992-005","DOIUrl":"https://doi.org/10.5957/attc-1992-005","url":null,"abstract":"This paper describes a series of experiments relating to the manoeuvring of the 22 tonne SWATH fishing vessel ALI. The results are related to the output of a manoeuvring prediction program resulting from the adaptation of monohull manoeuvring techniques to SWATH ships.","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"3 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":"123036106","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}
stator upstream of a propeller in an inclined flow. Two contrasting applications of this method are presented. The first application is an asymmetric stator and a matched propeller design for a typical surface ship with an inclined shaft propeller. The primary purpose of this design is simply to validate the design method. A new propeller and a large span asymmetric stator are designed which increase propulsive efficiency relative to an existing propeller. Model test results are provided which show that significant flow smoothing is achieved across the entire span of the propeller. The. model tests show that the predicted increase in propulsive efficiency of 6-7% was achieved. The second application is a backfit to a high speed U.S. Coast Guard patrol boat. The purpose of this design is to eliminate severe cavitation erosion near the root of the existing propeller. A small span asymmetric stator is designed to operate with the existing propeller. Details of the design and cavitation predictions are provided. Cavitation erosion tests in the DTMB water tunnel demonstrate that the severe erosion can be eliminated.
{"title":"Design Method and Application of an Asymmetric Stator Upstream of an Inclined Shaft Propeller","authors":"S. K. Neely, J. McMahon, B. Y. Chen","doi":"10.5957/attc-1992-017","DOIUrl":"https://doi.org/10.5957/attc-1992-017","url":null,"abstract":"stator upstream of a propeller in an inclined flow. Two contrasting applications of this method are presented. The first application is an asymmetric stator and a matched propeller design for a typical surface ship with an inclined shaft propeller. The primary purpose of this design is simply to validate the design method. A new propeller and a large span asymmetric stator are designed which increase propulsive efficiency relative to an existing propeller. Model test results are provided which show that significant flow smoothing is achieved across the entire span of the propeller. The. model tests show that the predicted increase in propulsive efficiency of 6-7% was achieved. The second application is a backfit to a high speed U.S. Coast Guard patrol boat. The purpose of this design is to eliminate severe cavitation erosion near the root of the existing propeller. A small span asymmetric stator is designed to operate with the existing propeller. Details of the design and cavitation predictions are provided. Cavitation erosion tests in the DTMB water tunnel demonstrate that the severe erosion can be eliminated.","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"13 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":"114153145","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}
This paper presents some of the developments in the University of New Orleans Towing Tank over the period May 1989 to May 1992. During these three years a number of research projects were initiated and completed, as well as tank equipment brought on-line.
{"title":"Developments at University of New Orleans Towing Tank, 1989-1992","authors":"R. Latorre","doi":"10.5957/attc-1992-028","DOIUrl":"https://doi.org/10.5957/attc-1992-028","url":null,"abstract":"This paper presents some of the developments in the University of New Orleans Towing Tank over the period May 1989 to May 1992. During these three years a number of research projects were initiated and completed, as well as tank equipment brought on-line.","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"58 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":"114522166","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}
Capacitance wave probes have been traditionally used at DTMB for measuring the wave heights in the Kelvin wake of towed surface ship models. Two new wave height measurement systems have recently been developed at DTMB: a laser wave height probe, using a linear array of charged couple devices, and a surface sensing mechanical probe. These devices represent improvements to the capacitance probes in the form of reduced and/or eliminated susceptibility to contamination and increased frequency response. In this paper, the physics of operation of the measurement systems and design considerations for their optimization will be discussed. Measurements of the free surface in a regular wave field, and for longitudinal wavecuts with a ship-model, over a wide Froude number range, have been made. Based on experimental results, evaluations of the various attributes and shortcomings of each type of probe will be made.
{"title":"Two Novel Free Surface Measurement Techniques Developed at DTMB","authors":"P. Chang, T. Ratcliffe, J. R. Rice, S. McGuigan","doi":"10.5957/attc-1992-027","DOIUrl":"https://doi.org/10.5957/attc-1992-027","url":null,"abstract":"Capacitance wave probes have been traditionally used at DTMB for measuring the wave heights in the Kelvin wake of towed surface ship models. Two new wave height measurement systems have recently been developed at DTMB: a laser wave height probe, using a linear array of charged couple devices, and a surface sensing mechanical probe. These devices represent improvements to the capacitance probes in the form of reduced and/or eliminated susceptibility to contamination and increased frequency response. In this paper, the physics of operation of the measurement systems and design considerations for their optimization will be discussed. Measurements of the free surface in a regular wave field, and for longitudinal wavecuts with a ship-model, over a wide Froude number range, have been made. Based on experimental results, evaluations of the various attributes and shortcomings of each type of probe will be made.","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"84 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":"123604007","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}
A standard method for conducting ice resistance model tests as adopted by the Institute for Marine Dynamics is described. The standard procedure involves splitting the total resistance into components; ice breaking, clearing, buoyancy and open water. This allows each component to be treated separately when scaling to full-scale. The analysis procedure is then outlined showing how dimensionless numbers are used to scale the results to full-scale. The basis of the analysis procedure is also given showing how each component of total resistance is affected by model and ice parameters. The result is a rational basis for the conduct and analysis of ice resistance model tests.
{"title":"A Standard Method for the Conduct and Analysis of Ice Resistance Model Tests","authors":"D. Spencer","doi":"10.5957/attc-1992-031","DOIUrl":"https://doi.org/10.5957/attc-1992-031","url":null,"abstract":"A standard method for conducting ice resistance model tests as adopted by the Institute for Marine Dynamics is described. The standard procedure involves splitting the total resistance into components; ice breaking, clearing, buoyancy and open water. This allows each component to be treated separately when scaling to full-scale. The analysis procedure is then outlined showing how dimensionless numbers are used to scale the results to full-scale. The basis of the analysis procedure is also given showing how each component of total resistance is affected by model and ice parameters. The result is a rational basis for the conduct and analysis of ice resistance model tests.","PeriodicalId":211134,"journal":{"name":"Day 1 Thu, June 11, 1992","volume":"42 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":"122649107","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：