Pub Date : 2011-12-19DOI: 10.23919/OCEANS.2011.6106910
E. Zimmerman, Gai-Lynn E. Marshall
The battle for our economic recovery and energy independence is be fought miles from our coastline, with more than 3000-feet of water beneath our frontline. Modern deepwater drilling has become a pivotal political field where reason is often silenced by process and public opinion polls. The truth is that deepwater oil reservoirs are currently producing approximately 10-percent of our energy demand and a handful of recently developed fields are producing half of that production. Without arguing the need to reduce our consumption, there is no doubt that the ability to stop the importation of foreign oil and increase the investment in our own economy, rests with domestic deepwater drilling.
{"title":"The modern challenge of domestic deepwater drilling","authors":"E. Zimmerman, Gai-Lynn E. Marshall","doi":"10.23919/OCEANS.2011.6106910","DOIUrl":"https://doi.org/10.23919/OCEANS.2011.6106910","url":null,"abstract":"The battle for our economic recovery and energy independence is be fought miles from our coastline, with more than 3000-feet of water beneath our frontline. Modern deepwater drilling has become a pivotal political field where reason is often silenced by process and public opinion polls. The truth is that deepwater oil reservoirs are currently producing approximately 10-percent of our energy demand and a handful of recently developed fields are producing half of that production. Without arguing the need to reduce our consumption, there is no doubt that the ability to stop the importation of foreign oil and increase the investment in our own economy, rests with domestic deepwater drilling.","PeriodicalId":19442,"journal":{"name":"OCEANS'11 MTS/IEEE KONA","volume":"140 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2011-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74715209","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}
Pub Date : 2011-12-19DOI: 10.23919/OCEANS.2011.6107304
S. Koh, Sang-young. Jung, Nam Jae Lee
This paper proposes a novel formulation for the optimal design of the endcap of autonomous underwater vehicles (AUVs). Conventional endcap structures have a shape of a flat circular plate. Hanwha Research and Development Center noticed that circular endcaps are substantially heavy and decided to design hemiellipsoidal endcaps in such a way that their weight is minimized. In order to achieve the goal, we suggest conducting shape optimization and thickness optimization tasks simultaneously in determining hemiellipsoidal endcaps with minimum weight. The weight of hemiellipsoidal endcaps should be minimized such that they do not fail due to either yielding or buckling. Therefore, the design optimization formulation requires performing multidisciplinary optimization during the design process. We determine solutions to the design optimization problem in a unique and globally optimal manner. In order to explore the significance of the design optimization formulation, we compare the weight of optimally designed hemiellipsoidal endcaps with that of conventional circular endcaps. We demonstrate that hemiellipsoidal endcaps with minimum weight are considerably lighter than circular endcaps.
{"title":"Optimal design of AUV endcaps","authors":"S. Koh, Sang-young. Jung, Nam Jae Lee","doi":"10.23919/OCEANS.2011.6107304","DOIUrl":"https://doi.org/10.23919/OCEANS.2011.6107304","url":null,"abstract":"This paper proposes a novel formulation for the optimal design of the endcap of autonomous underwater vehicles (AUVs). Conventional endcap structures have a shape of a flat circular plate. Hanwha Research and Development Center noticed that circular endcaps are substantially heavy and decided to design hemiellipsoidal endcaps in such a way that their weight is minimized. In order to achieve the goal, we suggest conducting shape optimization and thickness optimization tasks simultaneously in determining hemiellipsoidal endcaps with minimum weight. The weight of hemiellipsoidal endcaps should be minimized such that they do not fail due to either yielding or buckling. Therefore, the design optimization formulation requires performing multidisciplinary optimization during the design process. We determine solutions to the design optimization problem in a unique and globally optimal manner. In order to explore the significance of the design optimization formulation, we compare the weight of optimally designed hemiellipsoidal endcaps with that of conventional circular endcaps. We demonstrate that hemiellipsoidal endcaps with minimum weight are considerably lighter than circular endcaps.","PeriodicalId":19442,"journal":{"name":"OCEANS'11 MTS/IEEE KONA","volume":"58 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2011-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75114709","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}
Pub Date : 2011-12-19DOI: 10.23919/OCEANS.2011.6107150
L. Myers, B. Keogh, A. Bahaj
Full-scale marine current energy converter devices have now been operational for several years. These devices have the potential to provide large scale electricity generation when placed in farms/arrays in areas of fast flowing tidal currents. Now the full-scale concept has been proven experienced operators are in a position to provide array developers with devices for such applications, thus at present the first tidal arrays are in the planning and consenting stage around the globe. The inter-device spacing within these arrays can have a profound effect both on the flow field through the array itself and the on the surrounding environment. This paper describes a set of scale experiments aimed at investigating the interaction of devices within an array and potentially highlight some of the pitfalls of future array design which may result in sub-optimal device operation. Experimental results presented herein indicate that particular spacing can lead to regions of accelerated flow which may be exploited to provide greater power production. Further examination of this accelerated flow region is presented, with discourse surrounding the potential issues of placing devices in this region, and impacts the on array geometries as a whole are discussed.
{"title":"Experimental investigation of inter-array wake properties in early tidal turbine arrays","authors":"L. Myers, B. Keogh, A. Bahaj","doi":"10.23919/OCEANS.2011.6107150","DOIUrl":"https://doi.org/10.23919/OCEANS.2011.6107150","url":null,"abstract":"Full-scale marine current energy converter devices have now been operational for several years. These devices have the potential to provide large scale electricity generation when placed in farms/arrays in areas of fast flowing tidal currents. Now the full-scale concept has been proven experienced operators are in a position to provide array developers with devices for such applications, thus at present the first tidal arrays are in the planning and consenting stage around the globe. The inter-device spacing within these arrays can have a profound effect both on the flow field through the array itself and the on the surrounding environment. This paper describes a set of scale experiments aimed at investigating the interaction of devices within an array and potentially highlight some of the pitfalls of future array design which may result in sub-optimal device operation. Experimental results presented herein indicate that particular spacing can lead to regions of accelerated flow which may be exploited to provide greater power production. Further examination of this accelerated flow region is presented, with discourse surrounding the potential issues of placing devices in this region, and impacts the on array geometries as a whole are discussed.","PeriodicalId":19442,"journal":{"name":"OCEANS'11 MTS/IEEE KONA","volume":"9 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2011-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74354047","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}
Pub Date : 2011-12-19DOI: 10.23919/OCEANS.2011.6107032
M. Roughan, B. Morris
Through the development of the NSW node of the Australian Integrated Marine Observing System (NSW-IMOS). A mooring array of 4 moorings has been developed off the coast of Sydney, Australia, providing more than 2 years of timeseries data on the Sydney shelf. Parameters measured include velocity and temperature, salinity, fluorescence, dissolved oxygen and turbidity. This moored timeseries data complements the more than 70 year time series (since 1942) of physical sampling at the Port Hacking (Sydney, Australia) 50 m and 100 m sites, by providing spatial and temporal context. In this paper we investigate the relationship between the monthly vertical CTD profiles and the high temporal resolution moored timeseries, specifically the sub-monthly variability in the temperature and salinity observations. For the first time we have a timeseries of optical signals at two sites which can be used to give spatial and temporal context to the monthly biogeochemical and phytoplankton record from the physical samples. We assess the significance of sub monthly variability relative to the annual signal. We also identify issues with the optical signals obtained from the Wetlabs WQMS that appear as a result of moving to an operational phase of the program where instruments are rotated frequently.
{"title":"Using high-resolution ocean timeseries data to give context to long term hydrographic sampling off Port Hacking, NSW, Australia","authors":"M. Roughan, B. Morris","doi":"10.23919/OCEANS.2011.6107032","DOIUrl":"https://doi.org/10.23919/OCEANS.2011.6107032","url":null,"abstract":"Through the development of the NSW node of the Australian Integrated Marine Observing System (NSW-IMOS). A mooring array of 4 moorings has been developed off the coast of Sydney, Australia, providing more than 2 years of timeseries data on the Sydney shelf. Parameters measured include velocity and temperature, salinity, fluorescence, dissolved oxygen and turbidity. This moored timeseries data complements the more than 70 year time series (since 1942) of physical sampling at the Port Hacking (Sydney, Australia) 50 m and 100 m sites, by providing spatial and temporal context. In this paper we investigate the relationship between the monthly vertical CTD profiles and the high temporal resolution moored timeseries, specifically the sub-monthly variability in the temperature and salinity observations. For the first time we have a timeseries of optical signals at two sites which can be used to give spatial and temporal context to the monthly biogeochemical and phytoplankton record from the physical samples. We assess the significance of sub monthly variability relative to the annual signal. We also identify issues with the optical signals obtained from the Wetlabs WQMS that appear as a result of moving to an operational phase of the program where instruments are rotated frequently.","PeriodicalId":19442,"journal":{"name":"OCEANS'11 MTS/IEEE KONA","volume":"55 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2011-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74466801","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}
Pub Date : 2011-12-19DOI: 10.23919/OCEANS.2011.6107022
Chunyong Nie, J. Shelton
The installation of gravity installed anchors requires the knowledge of hydrodynamics and geotechnical engineering. This paper analyzes the anchor installation process from releasing the anchor in the water to reaching the maximum depth regarding the anchor's interaction with water and seabed soil. This analysis puts an emphasis on plate-shaped anchors which have more complicated geometry than pile-shaped torpedo anchors. A theoretical model to predict the penetration depth of gravity installed anchors was developed with hydrodynamic and geotechnical theory. The associated parameters were obtained from laboratory tests conducted in Texas A & M University Haynes Coastal Engineering Laboratory and OWN Low Speed Wind Tunnel. The results from the laboratory tests conducted for plate-shaped gravity installed anchors will be discussed. The validation of this prediction model by an anchor field installation database and field tests for both types of gravity installed anchor is presented.
{"title":"Prediction of gravity installed anchors installation penetration","authors":"Chunyong Nie, J. Shelton","doi":"10.23919/OCEANS.2011.6107022","DOIUrl":"https://doi.org/10.23919/OCEANS.2011.6107022","url":null,"abstract":"The installation of gravity installed anchors requires the knowledge of hydrodynamics and geotechnical engineering. This paper analyzes the anchor installation process from releasing the anchor in the water to reaching the maximum depth regarding the anchor's interaction with water and seabed soil. This analysis puts an emphasis on plate-shaped anchors which have more complicated geometry than pile-shaped torpedo anchors. A theoretical model to predict the penetration depth of gravity installed anchors was developed with hydrodynamic and geotechnical theory. The associated parameters were obtained from laboratory tests conducted in Texas A & M University Haynes Coastal Engineering Laboratory and OWN Low Speed Wind Tunnel. The results from the laboratory tests conducted for plate-shaped gravity installed anchors will be discussed. The validation of this prediction model by an anchor field installation database and field tests for both types of gravity installed anchor is presented.","PeriodicalId":19442,"journal":{"name":"OCEANS'11 MTS/IEEE KONA","volume":"14 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2011-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77172665","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}
Pub Date : 2011-12-19DOI: 10.23919/OCEANS.2011.6107121
M. Eichhorn, U. Kremer
This paper discusses opportunities to parallelize graph based path planning algorithms in a time varying environment. Parallel architectures have become commonplace, requiring algorithm to be parallelized for efficient execution. An additional focal point of this paper is the inclusion of inaccuracies in path planning as a result of forecast error variance, accuracy of calculation in the cost functions and a different observed vehicle speed in the real mission than planned. In this context, robust path planning algorithms will be described. These algorithms are equally applicable to land based, aerial, or underwater mobile autonomous systems. The results presented here provide the basis for a future research project in which the parallelized algorithms will be evaluated on multi and many core systems such as the dual core ARM Panda board and the 48 core Single-chip Cloud Computer (SCC). Modern multi and many core processors support a wide range of performance vs. energy tradeoffs that can be exploited in energy-constrained environments such as battery operated autonomous underwater vehicles. For this evaluation, the boards will be deployed within the Slocum glider, a commercially available, buoyancy driven autonomous underwater vehicle (AUV).
{"title":"Opportunities to parallelize path planning algorithms for autonomous underwater vehicles","authors":"M. Eichhorn, U. Kremer","doi":"10.23919/OCEANS.2011.6107121","DOIUrl":"https://doi.org/10.23919/OCEANS.2011.6107121","url":null,"abstract":"This paper discusses opportunities to parallelize graph based path planning algorithms in a time varying environment. Parallel architectures have become commonplace, requiring algorithm to be parallelized for efficient execution. An additional focal point of this paper is the inclusion of inaccuracies in path planning as a result of forecast error variance, accuracy of calculation in the cost functions and a different observed vehicle speed in the real mission than planned. In this context, robust path planning algorithms will be described. These algorithms are equally applicable to land based, aerial, or underwater mobile autonomous systems. The results presented here provide the basis for a future research project in which the parallelized algorithms will be evaluated on multi and many core systems such as the dual core ARM Panda board and the 48 core Single-chip Cloud Computer (SCC). Modern multi and many core processors support a wide range of performance vs. energy tradeoffs that can be exploited in energy-constrained environments such as battery operated autonomous underwater vehicles. For this evaluation, the boards will be deployed within the Slocum glider, a commercially available, buoyancy driven autonomous underwater vehicle (AUV).","PeriodicalId":19442,"journal":{"name":"OCEANS'11 MTS/IEEE KONA","volume":"229 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2011-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77590740","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}
Pub Date : 2011-12-19DOI: 10.23919/OCEANS.2011.6107153
C. Barngrover, R. Kastner, Thomas Denewiler, Greg Mills
Underwater vehicles have recently become more useful in ecological monitoring, largely in part to advanced processing capabilities enabled by modern computers. Most underwater vehicles are torpedo shaped and non-holonomically controlled, which makes them efficient, but they lack precise maneuverability. Some cube-shaped vehicles are used when more exact navigation is necessary; however they cannot take advantage of gliding motions and hydrodynamic lift as their vehicles have a large amount of drag. The Stingray Autonomous Underwater Vehicle (AUV) is a compact, lightweight AUV with a unique design implementation. The hull of the Stingray is a carbon fiber shell with a biomimetic design reminiscent of its ocean-dwelling namesake. This streamlined profile provides very low drag and allows the vehicle to glide through the water. The Stingray also uses a unique propulsion system, combining three vertical thrusters on the wings and tail for roll and pitch with two Voith-Schneider propellers mounted underneath for yaw and surge. In addition, these two propellers provide the ability to strafe, allowing the vehicle to move with six degrees of freedom. This enables the Stingray to easily maneuver at slow speeds and hover in a similar fashion to a helicopter, while also being able to take advantage of the lift generated by its wings to glide like a fixed-wing aircraft.
{"title":"The stingray AUV: A small and cost-effective solution for ecological monitoring","authors":"C. Barngrover, R. Kastner, Thomas Denewiler, Greg Mills","doi":"10.23919/OCEANS.2011.6107153","DOIUrl":"https://doi.org/10.23919/OCEANS.2011.6107153","url":null,"abstract":"Underwater vehicles have recently become more useful in ecological monitoring, largely in part to advanced processing capabilities enabled by modern computers. Most underwater vehicles are torpedo shaped and non-holonomically controlled, which makes them efficient, but they lack precise maneuverability. Some cube-shaped vehicles are used when more exact navigation is necessary; however they cannot take advantage of gliding motions and hydrodynamic lift as their vehicles have a large amount of drag. The Stingray Autonomous Underwater Vehicle (AUV) is a compact, lightweight AUV with a unique design implementation. The hull of the Stingray is a carbon fiber shell with a biomimetic design reminiscent of its ocean-dwelling namesake. This streamlined profile provides very low drag and allows the vehicle to glide through the water. The Stingray also uses a unique propulsion system, combining three vertical thrusters on the wings and tail for roll and pitch with two Voith-Schneider propellers mounted underneath for yaw and surge. In addition, these two propellers provide the ability to strafe, allowing the vehicle to move with six degrees of freedom. This enables the Stingray to easily maneuver at slow speeds and hover in a similar fashion to a helicopter, while also being able to take advantage of the lift generated by its wings to glide like a fixed-wing aircraft.","PeriodicalId":19442,"journal":{"name":"OCEANS'11 MTS/IEEE KONA","volume":"11 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2011-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77656141","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}
Pub Date : 2011-12-19DOI: 10.23919/OCEANS.2011.6107042
Jasmine B. D. Jaffrés, M. Heron
The impact of waves on the environment (e.g. erosion) and industries (incl. shipping and tourism) can be very significant. Here, we are presenting analysis of coastal wave data in the southern Great Barrier Reef (GBR), Australia, using a combination of observational data (HF radar) and a numerical wave model (WaveWatch3). The modeled significant wave height fields compare reasonably well with those obtained from the radar stations, inducing confidence in the two datasets. The radar-produced wave fields are spatially more variable compared to the model results, linked to the influence of wind stress resolution and currents in accurately determining wave characteristics.
{"title":"Wave climate in the Southern Great Barrier Reef, Australia - Evaluation of an ocean HF radar system and WaveWatch3","authors":"Jasmine B. D. Jaffrés, M. Heron","doi":"10.23919/OCEANS.2011.6107042","DOIUrl":"https://doi.org/10.23919/OCEANS.2011.6107042","url":null,"abstract":"The impact of waves on the environment (e.g. erosion) and industries (incl. shipping and tourism) can be very significant. Here, we are presenting analysis of coastal wave data in the southern Great Barrier Reef (GBR), Australia, using a combination of observational data (HF radar) and a numerical wave model (WaveWatch3). The modeled significant wave height fields compare reasonably well with those obtained from the radar stations, inducing confidence in the two datasets. The radar-produced wave fields are spatially more variable compared to the model results, linked to the influence of wind stress resolution and currents in accurately determining wave characteristics.","PeriodicalId":19442,"journal":{"name":"OCEANS'11 MTS/IEEE KONA","volume":"200 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2011-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77724193","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}
Pub Date : 2011-12-19DOI: 10.23919/OCEANS.2011.6106961
Dong-Soon Yang, Byung-Hak Cho, Shin-Yeol Park, Kyung-Sik Choi
The hydraulic power takeoff converter has been commonly applied to the rotating body type wave energy converters. It is because the hydraulic converter is more suited for dealing with periodic oscillating property of the body in a cost effective way. In order to extract wave energy effectively, the pressure and flow rate of the working fluid in the hydraulic converter should be kept adequately reflecting the period and height of given ocean wave. The pressure and the flow rate of the working fluid have effects on providing desired phase between incident wave and rotating body, and achieving optimum amplitude for the rotating body, respectively. To accomplish these objects together, a flexible controller is required reflecting the large variety of real ocean wave conditions. If the desired flexibility is limited, this may seriously affect the energy absorbing efficiency. The controller is designed to maintain the pressure and the flow rate of the working fluid at an optimum condition according to the given incident waves.
{"title":"Design and control of 2kW class power takeoff unit for rotating body type wave energy converter","authors":"Dong-Soon Yang, Byung-Hak Cho, Shin-Yeol Park, Kyung-Sik Choi","doi":"10.23919/OCEANS.2011.6106961","DOIUrl":"https://doi.org/10.23919/OCEANS.2011.6106961","url":null,"abstract":"The hydraulic power takeoff converter has been commonly applied to the rotating body type wave energy converters. It is because the hydraulic converter is more suited for dealing with periodic oscillating property of the body in a cost effective way. In order to extract wave energy effectively, the pressure and flow rate of the working fluid in the hydraulic converter should be kept adequately reflecting the period and height of given ocean wave. The pressure and the flow rate of the working fluid have effects on providing desired phase between incident wave and rotating body, and achieving optimum amplitude for the rotating body, respectively. To accomplish these objects together, a flexible controller is required reflecting the large variety of real ocean wave conditions. If the desired flexibility is limited, this may seriously affect the energy absorbing efficiency. The controller is designed to maintain the pressure and the flow rate of the working fluid at an optimum condition according to the given incident waves.","PeriodicalId":19442,"journal":{"name":"OCEANS'11 MTS/IEEE KONA","volume":"416 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2011-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77765584","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}
Pub Date : 2011-12-19DOI: 10.23919/OCEANS.2011.6107026
M. Ueno, Hideki Miyazaki, H. Taguchi, Y. Kitagawa, Y. Tsukada
The all-round wave generator, a model ship with a cargo shift simulator, and the carriage system tracking the model ship reproduced a phenomenon occurred to a fast ferry at an actual directional sea; a large roll motion and subsequent cargo collapse in a following sea condition. The all-round wave generator consisting 382 segments surrounding the whole periphery of the basin successfully reproduced the estimated directional wave field in the model scale. The analytical calculation clarified the estimated directional wave field and the corresponding encounter wave properties. A small concentrating wave triggered the first large roll motion that induced the cargo shift and then lead to the larger roll and yaw motion. Other motion data such as pitch angle and drift angle revealed how the fast ferry respond to the successive large quartering waves.
{"title":"Reproduction of an actual sea and ship motion using the all-round wave generator","authors":"M. Ueno, Hideki Miyazaki, H. Taguchi, Y. Kitagawa, Y. Tsukada","doi":"10.23919/OCEANS.2011.6107026","DOIUrl":"https://doi.org/10.23919/OCEANS.2011.6107026","url":null,"abstract":"The all-round wave generator, a model ship with a cargo shift simulator, and the carriage system tracking the model ship reproduced a phenomenon occurred to a fast ferry at an actual directional sea; a large roll motion and subsequent cargo collapse in a following sea condition. The all-round wave generator consisting 382 segments surrounding the whole periphery of the basin successfully reproduced the estimated directional wave field in the model scale. The analytical calculation clarified the estimated directional wave field and the corresponding encounter wave properties. A small concentrating wave triggered the first large roll motion that induced the cargo shift and then lead to the larger roll and yaw motion. Other motion data such as pitch angle and drift angle revealed how the fast ferry respond to the successive large quartering waves.","PeriodicalId":19442,"journal":{"name":"OCEANS'11 MTS/IEEE KONA","volume":"97 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2011-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78044271","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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