The paper presents trials of the iExperiment Towing Tank component of MIT’s iMarine system. A remotely operated laboratory experiment for demonstrating ship resistance was developed and conducted in the MIT Towing Tank in Cambridge, Massachusetts. The lab was run remotely during a classroom session on model testing in a fluid mechanics class at Maine Maritime Academy in Castine, Maine. Using an internet connection, students operated the model test in the Towing Tank in real time through the learning portal “iMarine”. They were able to vary run parameters, repeat runs and visualize the experiment on web-based cameras. Data for the hull resistance vs. speed were collected in real time and automatically posted on the i-Marine server for immediate download by the students. An overview of the MIT Towing Tank iExperiment and the iMarine system is discussed as well as details on the success of the experimental runs in the classroom. The written lab materials used for the lab are also presented. The lab experiment consisted of standard resistance tests on a Series 60 hull model. The data collected from the lab is also presented.
{"title":"Trials of the MIT i-Experiment : A Web-Based Remotely Operated Towing Tank for Experimentation and Education","authors":"R. Kimball, K. Hendrickson, M. Unger, D. Yue","doi":"10.5957/attc-2007-010","DOIUrl":"https://doi.org/10.5957/attc-2007-010","url":null,"abstract":"The paper presents trials of the iExperiment Towing Tank component of MIT’s iMarine system. A remotely operated laboratory experiment for demonstrating ship resistance was developed and conducted in the MIT Towing Tank in Cambridge, Massachusetts. The lab was run remotely during a classroom session on model testing in a fluid mechanics class at Maine Maritime Academy in Castine, Maine. Using an internet connection, students operated the model test in the Towing Tank in real time through the learning portal “iMarine”. They were able to vary run parameters, repeat runs and visualize the experiment on web-based cameras. Data for the hull resistance vs. speed were collected in real time and automatically posted on the i-Marine server for immediate download by the students. An overview of the MIT Towing Tank iExperiment and the iMarine system is discussed as well as details on the success of the experimental runs in the classroom. The written lab materials used for the lab are also presented. The lab experiment consisted of standard resistance tests on a Series 60 hull model. The data collected from the lab is also presented.","PeriodicalId":170026,"journal":{"name":"Day 3 Fri, August 10, 2007","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124561179","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}
In a recent study to evaluate the occupational risks induced by ship motions on the fishing fleet of Newfoundland, a model of a 65’ fishing vessel fitted with paravanes was tested in the Offshore Engineering Basin (OEB) of IOT. This project was done under a larger umbrella community initiative called SafetyNet to evaluate health and safety issues of the fishing industry. The particular focus of this project was to evaluate motion induced interruptions onboard the fishing vessels for various operational scenarios. Paravanes are the most common motion reducing devices used on Newfoundland fishing vessels. Paravanes were initially modelled by scaling down both the geometry and the weight using Froude scaling laws. This modeling strategy proved to be unsuccessful and several modifications to the paravanes were required throughout the test program. This paper describes the model seakeeping tests done at IOT with particular focus on the challenges encountered in modeling the paravanes. Some of the model test, sea trial and numerical prediction results obtained with and without paravanes deployed are included in the paper.
{"title":"Modeling Paravanes for Seakeeping Tests of Fishing Vessels","authors":"Ayhan Akinturk, David Cumming, Donald Bass","doi":"10.5957/attc-2007-009","DOIUrl":"https://doi.org/10.5957/attc-2007-009","url":null,"abstract":"In a recent study to evaluate the occupational risks induced by ship motions on the fishing fleet of Newfoundland, a model of a 65’ fishing vessel fitted with paravanes was tested in the Offshore Engineering Basin (OEB) of IOT. This project was done under a larger umbrella community initiative called SafetyNet to evaluate health and safety issues of the fishing industry. The particular focus of this project was to evaluate motion induced interruptions onboard the fishing vessels for various operational scenarios. Paravanes are the most common motion reducing devices used on Newfoundland fishing vessels. Paravanes were initially modelled by scaling down both the geometry and the weight using Froude scaling laws. This modeling strategy proved to be unsuccessful and several modifications to the paravanes were required throughout the test program.\u0000 This paper describes the model seakeeping tests done at IOT with particular focus on the challenges encountered in modeling the paravanes. Some of the model test, sea trial and numerical prediction results obtained with and without paravanes deployed are included in the paper.","PeriodicalId":170026,"journal":{"name":"Day 3 Fri, August 10, 2007","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116716537","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 Simple Method for the Evaluation of the Form Factor and the Low Speed Wave Resistance” by C. W. Prohaska. A simple method to evaluate form factor and low speed wave resistance was first introduced during the Eleventh ITTC - Resistance Session by C. W. Prohaska of the Hydro-og Aerodynamisk Lab (ref[1]).
C. W. Prohaska的“一种简单的评估形状因子和低速波阻力的方法”。Hydro-og Aerodynamisk Lab的C. W. Prohaska在第十一届ITTC - resistance会议上首次介绍了一种简单的评估形状因子和低速波阻力的方法(参考文献[1])。
{"title":"The Effect of Model Size on Form Factor and Predicted Resistance","authors":"Horace H. Rackham","doi":"10.5957/attc-2007-007","DOIUrl":"https://doi.org/10.5957/attc-2007-007","url":null,"abstract":"“A Simple Method for the Evaluation of the Form Factor and the Low Speed Wave Resistance” by C. W. Prohaska.\u0000 A simple method to evaluate form factor and low speed wave resistance was first introduced during the Eleventh ITTC - Resistance Session by C. W. Prohaska of the Hydro-og Aerodynamisk Lab (ref[1]).","PeriodicalId":170026,"journal":{"name":"Day 3 Fri, August 10, 2007","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123242919","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 suitability of sting mounting for submarine resistance experiments was investigate at two scale ratios. The impact of geometry modifications and the sting are isolated. It was found that the flow around the sting has a significant impact upstream on the model, resulting in an artificially low resistance measurement. The DARPA SUBOFF hull form was used for these experiments.
{"title":"Impact of Sting Mounting on Submarine Resistance","authors":"B. Beaver","doi":"10.5957/attc-2007-011","DOIUrl":"https://doi.org/10.5957/attc-2007-011","url":null,"abstract":"The suitability of sting mounting for submarine resistance experiments was investigate at two scale ratios. The impact of geometry modifications and the sting are isolated. It was found that the flow around the sting has a significant impact upstream on the model, resulting in an artificially low resistance measurement. The DARPA SUBOFF hull form was used for these experiments.","PeriodicalId":170026,"journal":{"name":"Day 3 Fri, August 10, 2007","volume":"59 36","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120886311","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}
In January 2004, Memorial University purchased a stereoscopic Particle Image Velocimetry (PIV) system for making flow measurements. Although the system was potentially very versatile, its primary application was envisioned to be in a towing tank. The system was supplied as a complete package of hardware and software for calibration, data collection and analysis. The intention of the PIV system designers was to collect as many data frames as possible for a fixed measurement plane location, relative to the model. This required the PIV system to be fixed on the towing carriage, moving with the model being studied. It was found during some preliminary experiments that an active seeding delivery system was necessary to ensure sufficiently high seeding particle concentration, especially when measuring flow velocities around a model hull with a large yaw angle. This paper describes the development of a seeding technique for a PIV system that can be used in a towing tank. The paper also includes an estimate of the uncertainty of the measurement system, including the analysis of the flow behind the device used to deliver seed particles into the flow.
{"title":"Commissioning a Stereoscopic Particle Image Velocimetry System for Application in a Towing Tank","authors":"D. Molyneux, Jie Xu, N. Bose","doi":"10.5957/attc-2007-006","DOIUrl":"https://doi.org/10.5957/attc-2007-006","url":null,"abstract":"In January 2004, Memorial University purchased a stereoscopic Particle Image Velocimetry (PIV) system for making flow measurements. Although the system was potentially very versatile, its primary application was envisioned to be in a towing tank. The system was supplied as a complete package of hardware and software for calibration, data collection and analysis. The intention of the PIV system designers was to collect as many data frames as possible for a fixed measurement plane location, relative to the model. This required the PIV system to be fixed on the towing carriage, moving with the model being studied. It was found during some preliminary experiments that an active seeding delivery system was necessary to ensure sufficiently high seeding particle concentration, especially when measuring flow velocities around a model hull with a large yaw angle. This paper describes the development of a seeding technique for a PIV system that can be used in a towing tank. The paper also includes an estimate of the uncertainty of the measurement system, including the analysis of the flow behind the device used to deliver seed particles into the flow.","PeriodicalId":170026,"journal":{"name":"Day 3 Fri, August 10, 2007","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133562292","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}
Collisions between oceangoing vessels and large whales (shipstrikes), while rare, are not unheard of. Naval Surface Warfare Carderock Division was contracted to perform a model scale experiment to characterize the nature, likelihood and severity of a shipstrike. Encounters between a fully appended commercial container ship type hull and an instrumented model of a North Atlantic right whale were conducted at a range of ship speeds, whale positions, and orientations. Accelerations experienced by the whale model were recorded and analyzed to measure the severity of collisions, and the danger zone ahead of the moving ship model was identified.
{"title":"Model Testing of a Ship-Whale Collision","authors":"J. Slutsky","doi":"10.5957/attc-2007-008","DOIUrl":"https://doi.org/10.5957/attc-2007-008","url":null,"abstract":"Collisions between oceangoing vessels and large whales (shipstrikes), while rare, are not unheard of. Naval Surface Warfare Carderock Division was contracted to perform a model scale experiment to characterize the nature, likelihood and severity of a shipstrike. Encounters between a fully appended commercial container ship type hull and an instrumented model of a North Atlantic right whale were conducted at a range of ship speeds, whale positions, and orientations. Accelerations experienced by the whale model were recorded and analyzed to measure the severity of collisions, and the danger zone ahead of the moving ship model was identified.","PeriodicalId":170026,"journal":{"name":"Day 3 Fri, August 10, 2007","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121236477","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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