Detecting underwater objects is an important application in marine applications. Most of the techniques are based on the amplitude related techniques, whereby the amplitude of the received echo is used to detect objects within specified bounds. Amplitude techniques however are prone to interference and attenuation, thus limiting the capabilities of such systems. Hence, the aim of this paper is to propose a new technique that detect and track underwater moving objects using the turbulence generated by the object. Wideband signals have proven to be a very efficient alternative for merging turbulent flow characteristics and waveform design in order to describe and explain the behavior of turbulence, both artificial and natural. Therefore, constructing adapted waveforms to the natural turbulence embedded in the flow, as well as to the artificial turbulence created by an unknown underwater moving object may hold the key for a new technique for underwater object tracking. When acoustic signals with a particular Instantaneous Frequency Law traveling into underwater environment will hit a moving object, their Instantaneous Frequency Law will capture the object's artificial turbulence, as well as the natural turbulence embedded in the flow. Experimental results carried out in our reduced scale facility provide the validation of the technique.
{"title":"Underwater object tracking using time frequency signatures of acoustic signals","authors":"Digulescu Angela, Candel Ion, Ioana Cornel, Bucur Diana, Petrut Teodor","doi":"10.1109/OCEANS-TAIPEI.2014.6964296","DOIUrl":"https://doi.org/10.1109/OCEANS-TAIPEI.2014.6964296","url":null,"abstract":"Detecting underwater objects is an important application in marine applications. Most of the techniques are based on the amplitude related techniques, whereby the amplitude of the received echo is used to detect objects within specified bounds. Amplitude techniques however are prone to interference and attenuation, thus limiting the capabilities of such systems. Hence, the aim of this paper is to propose a new technique that detect and track underwater moving objects using the turbulence generated by the object. Wideband signals have proven to be a very efficient alternative for merging turbulent flow characteristics and waveform design in order to describe and explain the behavior of turbulence, both artificial and natural. Therefore, constructing adapted waveforms to the natural turbulence embedded in the flow, as well as to the artificial turbulence created by an unknown underwater moving object may hold the key for a new technique for underwater object tracking. When acoustic signals with a particular Instantaneous Frequency Law traveling into underwater environment will hit a moving object, their Instantaneous Frequency Law will capture the object's artificial turbulence, as well as the natural turbulence embedded in the flow. Experimental results carried out in our reduced scale facility provide the validation of the technique.","PeriodicalId":114739,"journal":{"name":"OCEANS 2014 - TAIPEI","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133453739","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 : 2014-04-07DOI: 10.1109/OCEANS-TAIPEI.2014.6964513
Jie Chen, Huiping Xu, R. Qin
With the deepening exploration of the ocean, the building of seafloor observatory systems has become a hot topic. It is also a key way for furthering advancement in the area of the International Marine Science in the 21st century. China's first experimental seafloor observatory system named Xiaoqushan Seafloor Observatory has already been set up and put into operation since April 20th, 2009. Meanwhile, the state 863 program East China Sea Coastal Seafloor Observatory System and a research project concerning key technologies in seafloor observation are supposed to be completed in 2014. The East China Sea Seafloor Observatory System (ECSSOS) including the Xiaoqushan Seafloor Observatory and the coastal seafloor observatory system will be continually expanded in the near future. ECSSOS consists of multiple junction boxes and instruments performing full-time continuous monitoring. Thus how to store, transmit, analyze and share the large amount of received data will be an issue. To deal with this issue, the authors developed the WebGIS of ECSSOS. This paper aims to introduce the background, frame structure, function modules and technologies of this WebGIS, and make a detailed explanation of algorithms applied in real-time data querying module and historical data querying module.
{"title":"Implementation of the WebGIS of East China Sea seafloor observatory system","authors":"Jie Chen, Huiping Xu, R. Qin","doi":"10.1109/OCEANS-TAIPEI.2014.6964513","DOIUrl":"https://doi.org/10.1109/OCEANS-TAIPEI.2014.6964513","url":null,"abstract":"With the deepening exploration of the ocean, the building of seafloor observatory systems has become a hot topic. It is also a key way for furthering advancement in the area of the International Marine Science in the 21st century. China's first experimental seafloor observatory system named Xiaoqushan Seafloor Observatory has already been set up and put into operation since April 20th, 2009. Meanwhile, the state 863 program East China Sea Coastal Seafloor Observatory System and a research project concerning key technologies in seafloor observation are supposed to be completed in 2014. The East China Sea Seafloor Observatory System (ECSSOS) including the Xiaoqushan Seafloor Observatory and the coastal seafloor observatory system will be continually expanded in the near future. ECSSOS consists of multiple junction boxes and instruments performing full-time continuous monitoring. Thus how to store, transmit, analyze and share the large amount of received data will be an issue. To deal with this issue, the authors developed the WebGIS of ECSSOS. This paper aims to introduce the background, frame structure, function modules and technologies of this WebGIS, and make a detailed explanation of algorithms applied in real-time data querying module and historical data querying module.","PeriodicalId":114739,"journal":{"name":"OCEANS 2014 - TAIPEI","volume":"18 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131838749","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 : 2014-04-07DOI: 10.1109/OCEANS-TAIPEI.2014.6964376
D. Abraham
The peak envelope or intensity of a sonar signal is an important quantity in many applications (e.g., object detection, fish density estimation, and quantifying risk to marine mammals). However, modeling, prediction, and analysis is often limited to second-order statistics (e.g., sonar equation, transmission loss). Standard techniques from order-statistics are applied to approximate sonar signal peak statistics where both signal statistics and non-stationarity are captured through the use of heavy-tailed probability distributions. Analysis of real data from an echo-repeater sonar signal over six bandwidths and varying signal-to-noise ratio showed a good fit of the model for the expected peak to average intensity ratio. Predictions of spread overestimated the observed spread for small bandwidth-time (WT) products but improved in accuracy as WT increased.
{"title":"Modeling sonar signal peak to average intensity ratio","authors":"D. Abraham","doi":"10.1109/OCEANS-TAIPEI.2014.6964376","DOIUrl":"https://doi.org/10.1109/OCEANS-TAIPEI.2014.6964376","url":null,"abstract":"The peak envelope or intensity of a sonar signal is an important quantity in many applications (e.g., object detection, fish density estimation, and quantifying risk to marine mammals). However, modeling, prediction, and analysis is often limited to second-order statistics (e.g., sonar equation, transmission loss). Standard techniques from order-statistics are applied to approximate sonar signal peak statistics where both signal statistics and non-stationarity are captured through the use of heavy-tailed probability distributions. Analysis of real data from an echo-repeater sonar signal over six bandwidths and varying signal-to-noise ratio showed a good fit of the model for the expected peak to average intensity ratio. Predictions of spread overestimated the observed spread for small bandwidth-time (WT) products but improved in accuracy as WT increased.","PeriodicalId":114739,"journal":{"name":"OCEANS 2014 - TAIPEI","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134448400","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 : 2014-04-07DOI: 10.1109/OCEANS-TAIPEI.2014.6964532
S. Liang, N. Kuo, D. Doong, T. Hsu
Wind effect on Kuroshio-induced island wake downstream the Green Island, Taiwan is studied using a depth-averaged shallow-water model. Seasonal monsoon effect on spatial-temporal scales, such as aspect ratio, dimensionless width, and Strouhal number as well as propagation speed of the vortices of Reynolds number 50 is studied. It is found that northeast monsoon has more pronounced effect in wake characteristics than southwest monsoon does, in terms of flow speed and recirculation zone, the aspect ratio, and dimensionless width. Vortices are pushed back close to the island with a smaller size of recirculation when Kuroshio flows against the northeast monsoon; Vortices are pushed farther downstream with a larger size of recirculation when Kuroshio flows in favor of the southwest monsoon. However, wind effect on temporal variation of island wake seems insignificant. The Strouhal number is between 0.116 and 0.125 from numerical simulations. This value is close to result of previous reports.
{"title":"Numerical study of wind effect on green island wake","authors":"S. Liang, N. Kuo, D. Doong, T. Hsu","doi":"10.1109/OCEANS-TAIPEI.2014.6964532","DOIUrl":"https://doi.org/10.1109/OCEANS-TAIPEI.2014.6964532","url":null,"abstract":"Wind effect on Kuroshio-induced island wake downstream the Green Island, Taiwan is studied using a depth-averaged shallow-water model. Seasonal monsoon effect on spatial-temporal scales, such as aspect ratio, dimensionless width, and Strouhal number as well as propagation speed of the vortices of Reynolds number 50 is studied. It is found that northeast monsoon has more pronounced effect in wake characteristics than southwest monsoon does, in terms of flow speed and recirculation zone, the aspect ratio, and dimensionless width. Vortices are pushed back close to the island with a smaller size of recirculation when Kuroshio flows against the northeast monsoon; Vortices are pushed farther downstream with a larger size of recirculation when Kuroshio flows in favor of the southwest monsoon. However, wind effect on temporal variation of island wake seems insignificant. The Strouhal number is between 0.116 and 0.125 from numerical simulations. This value is close to result of previous reports.","PeriodicalId":114739,"journal":{"name":"OCEANS 2014 - TAIPEI","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125473585","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 : 2014-04-07DOI: 10.1109/OCEANS-TAIPEI.2014.6964547
Shih-Jen Huang, Jung-Te Lin, Y. Lo, N. Kuo, Chung‐Ru Ho
In order to estimate the thermal plumes discharged from Chinshan and Kuosheng nuclear power plants on the coast of north Taiwan, this study uses the thermal infrared data from Landsat 7 ETM+(Enhanced Thematic Mapper Surface Temperature) to contrast with the in-situ SST measurement for the intake/discharge ports of the nuclear power plants. The near-infrared (band 4) data of Landsat 7 ETM+ are firstly applied to distinguish ocean and land, and then the thermal infrared (band 6) data are used to estimate SST. The algorithm of SST on north Taiwan is established in this study by the contrast between the in-situ SST data of the two nuclear power plants and the thermal infrared data of Landsat 7 ETM+. The standard deviation of SST retrieved through this algorithm is estimated to be 3.1°C, but the mean difference is near 0. According to the retrieved SST from the satellite data, the warm-plume (>4°C than offshore SST) discharge of Chinshan nuclear power plant reaches 540-1080 m far from its discharge port, but for Kuosheng Nuclear Power Plant, the farthest of the warm-plume discharge from the discharge port is 390-900 m. The retrieved SST gradually gets cooler by diffusion from the discharge port to the offshore. Apparently, the Landsat 7 ETM+ can be applied to measure the special variance of SST. The result also shows the area of significant thermal plume (>4°C than offshore SST) are about 0.01-1.3 km2 and 0.09-8.53 km2 for the Chinshan and Kuosheng nuclear plants respectively. Moreover, the significant thermal plume area is affected by tides. During the flood tide, the warm-plume discharge gets close to the coast, and it will make the significant thermal plume area increase. Besides, the second significant thermal plume (>2°C than offshore SST) is also increased during the ebb tide because the thermal plume may be taken away and diluted from the discharged port. However, due to different topographies, the area of thermal plume of the Kuosheng is broader than that of Chinshan nuclear power plant.
{"title":"The coastal sea surface temperature changes near the nuclear power plants of northern Taiwan observed from satellite images","authors":"Shih-Jen Huang, Jung-Te Lin, Y. Lo, N. Kuo, Chung‐Ru Ho","doi":"10.1109/OCEANS-TAIPEI.2014.6964547","DOIUrl":"https://doi.org/10.1109/OCEANS-TAIPEI.2014.6964547","url":null,"abstract":"In order to estimate the thermal plumes discharged from Chinshan and Kuosheng nuclear power plants on the coast of north Taiwan, this study uses the thermal infrared data from Landsat 7 ETM+(Enhanced Thematic Mapper Surface Temperature) to contrast with the in-situ SST measurement for the intake/discharge ports of the nuclear power plants. The near-infrared (band 4) data of Landsat 7 ETM+ are firstly applied to distinguish ocean and land, and then the thermal infrared (band 6) data are used to estimate SST. The algorithm of SST on north Taiwan is established in this study by the contrast between the in-situ SST data of the two nuclear power plants and the thermal infrared data of Landsat 7 ETM+. The standard deviation of SST retrieved through this algorithm is estimated to be 3.1°C, but the mean difference is near 0. According to the retrieved SST from the satellite data, the warm-plume (>4°C than offshore SST) discharge of Chinshan nuclear power plant reaches 540-1080 m far from its discharge port, but for Kuosheng Nuclear Power Plant, the farthest of the warm-plume discharge from the discharge port is 390-900 m. The retrieved SST gradually gets cooler by diffusion from the discharge port to the offshore. Apparently, the Landsat 7 ETM+ can be applied to measure the special variance of SST. The result also shows the area of significant thermal plume (>4°C than offshore SST) are about 0.01-1.3 km2 and 0.09-8.53 km2 for the Chinshan and Kuosheng nuclear plants respectively. Moreover, the significant thermal plume area is affected by tides. During the flood tide, the warm-plume discharge gets close to the coast, and it will make the significant thermal plume area increase. Besides, the second significant thermal plume (>2°C than offshore SST) is also increased during the ebb tide because the thermal plume may be taken away and diluted from the discharged port. However, due to different topographies, the area of thermal plume of the Kuosheng is broader than that of Chinshan nuclear power plant.","PeriodicalId":114739,"journal":{"name":"OCEANS 2014 - TAIPEI","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131258588","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 : 2014-04-07DOI: 10.1109/OCEANS-TAIPEI.2014.6964514
K. Kawaguchi, E. Araki, Masanori Hoshino, T. Yokobiki, H. Matsumoto, S. Nishida, Jin-Kyu Choi, T. Kimura, N. Takahashi, T. Baba, M. Nakano, Takeshi Nakamura, Y. Kaneda
DONET (Dense Ocean-floor Observatory Network for Earthquakes and Tsunamis) is a submarine cabled real-time seafloor surveillance infrastructure for earthquake activity at assumed focus region of mega-thrust earthquake around Japan. The original system DONET1 was constructed in To-Nankai earthquake focus region and twenty seafloor observatories are working in operation beginning in 2011 to contribute the earthquake and tsunami early warning program in Japan. Development of second seafloor network DONET2 was planned in 2010 to target Nankai earthquake focus region. This paper describes a decision making approach of DONET2 observation site arrangement based on the knowledge of DONET1 development and construction.
{"title":"Decision-making on seafloor surveillance infrastructure site for Earthquake and Tsunami monitoring in Western Japan","authors":"K. Kawaguchi, E. Araki, Masanori Hoshino, T. Yokobiki, H. Matsumoto, S. Nishida, Jin-Kyu Choi, T. Kimura, N. Takahashi, T. Baba, M. Nakano, Takeshi Nakamura, Y. Kaneda","doi":"10.1109/OCEANS-TAIPEI.2014.6964514","DOIUrl":"https://doi.org/10.1109/OCEANS-TAIPEI.2014.6964514","url":null,"abstract":"DONET (Dense Ocean-floor Observatory Network for Earthquakes and Tsunamis) is a submarine cabled real-time seafloor surveillance infrastructure for earthquake activity at assumed focus region of mega-thrust earthquake around Japan. The original system DONET1 was constructed in To-Nankai earthquake focus region and twenty seafloor observatories are working in operation beginning in 2011 to contribute the earthquake and tsunami early warning program in Japan. Development of second seafloor network DONET2 was planned in 2010 to target Nankai earthquake focus region. This paper describes a decision making approach of DONET2 observation site arrangement based on the knowledge of DONET1 development and construction.","PeriodicalId":114739,"journal":{"name":"OCEANS 2014 - TAIPEI","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131524838","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 : 2014-04-07DOI: 10.1109/OCEANS-TAIPEI.2014.6964389
Ruey‐Chang Wei, W. Chang, Chi-Fang Chen
Ocean ambient noise data were collected by underwater MACHO (MArine Cable Hosted Observatory) system, deployed by Central Weather Bureau, at northeastern sea of Taiwan from October of 2011 to March of 2012. With most rainfall of Taiwan in the area of measurement, the rain-generated underwater noise was studied in an attempt to estimate rainfall contribution by the correlation analysis with the acoustic data. Due to the intermittent nature of rain fall occurrence, significant rainfall events with extended period were extracted from the weather data measured at nearest Su-ao weather station, and then patched together to form a rainfall intensity time series. Linear regression between corresponding ocean ambient noise level time series of several frequencies and rainfall intensity data were performed, so the characteristic frequency for prediction can be decided. Duration of this study was divided into Fall, Winter, and Spring, then the statistics and distributions of ambient noise level at different frequencies and rainfall intensities were calculated, so that seasonal variations were also discussed.
{"title":"Estimation of rainfall contribution to ocean ambient noise in Northeastern Taiwan Sea","authors":"Ruey‐Chang Wei, W. Chang, Chi-Fang Chen","doi":"10.1109/OCEANS-TAIPEI.2014.6964389","DOIUrl":"https://doi.org/10.1109/OCEANS-TAIPEI.2014.6964389","url":null,"abstract":"Ocean ambient noise data were collected by underwater MACHO (MArine Cable Hosted Observatory) system, deployed by Central Weather Bureau, at northeastern sea of Taiwan from October of 2011 to March of 2012. With most rainfall of Taiwan in the area of measurement, the rain-generated underwater noise was studied in an attempt to estimate rainfall contribution by the correlation analysis with the acoustic data. Due to the intermittent nature of rain fall occurrence, significant rainfall events with extended period were extracted from the weather data measured at nearest Su-ao weather station, and then patched together to form a rainfall intensity time series. Linear regression between corresponding ocean ambient noise level time series of several frequencies and rainfall intensity data were performed, so the characteristic frequency for prediction can be decided. Duration of this study was divided into Fall, Winter, and Spring, then the statistics and distributions of ambient noise level at different frequencies and rainfall intensities were calculated, so that seasonal variations were also discussed.","PeriodicalId":114739,"journal":{"name":"OCEANS 2014 - TAIPEI","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131580874","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 : 2014-04-07DOI: 10.1109/OCEANS-TAIPEI.2014.6964597
Jinghua Tao, Xu Jia, Jinlin Hou, J. Tao
As a unique structural system in the float-over installation, DSF supports topside weight in the load-out and tow process, and cushions collision loads of the topside and the barge in the mating process. Based on the float-over installation of LW3-1CEP topside, the paper makes deeply studies on DSF from many aspects, such as general layout, span change, DSU layout, special cap limit, space bound, member optimization, weight control and so on. And then this paper discusses a new type of DSF system with greater capability to support topside weight of up to 27,000 metric tons, meeting functional requirements of super-heavy topside float-over installation. The research of the new type of DSF will be a guide and reference for future heavier topside float-over installation.
{"title":"Research on the DSF for float-over of super-heavy topside in the South China Sea","authors":"Jinghua Tao, Xu Jia, Jinlin Hou, J. Tao","doi":"10.1109/OCEANS-TAIPEI.2014.6964597","DOIUrl":"https://doi.org/10.1109/OCEANS-TAIPEI.2014.6964597","url":null,"abstract":"As a unique structural system in the float-over installation, DSF supports topside weight in the load-out and tow process, and cushions collision loads of the topside and the barge in the mating process. Based on the float-over installation of LW3-1CEP topside, the paper makes deeply studies on DSF from many aspects, such as general layout, span change, DSU layout, special cap limit, space bound, member optimization, weight control and so on. And then this paper discusses a new type of DSF system with greater capability to support topside weight of up to 27,000 metric tons, meeting functional requirements of super-heavy topside float-over installation. The research of the new type of DSF will be a guide and reference for future heavier topside float-over installation.","PeriodicalId":114739,"journal":{"name":"OCEANS 2014 - TAIPEI","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132911815","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 : 2014-04-07DOI: 10.1109/OCEANS-TAIPEI.2014.6964578
Seong-Oh Kim, Y. Ock, J. Heo, Jong-Chun Park, Hee-sung Shin, Seung-Keon Lee
IMO(International Marine Organization) adopted the mandatory application of the EEDI(Energy Efficiency Design Index) for new ships in order to reduce the emissions of CO2(IMO, 2011). Added resistance, which is defined as an increased resistance of ships in waves, have a large effect on emissions of CO2. It is important that exact estimation of added resistance is essential for precise calculation of EEDI coefficient (MEPC 63rd session report). In the present study, CFD(Computational Fluid Dynamics) simulation using overset grid method is performed on KCS(KRISO Container Ship) hull form to predict added resistance for precise EEDI coefficient. Simulation results is compared to experimental result(Simonsen et al, 2008 [18]).
为了减少二氧化碳的排放，IMO(国际海事组织)对新船强制采用了EEDI(能源效率设计指数)(IMO, 2011)。附加阻力，即船舶在波浪中阻力的增加，对二氧化碳的排放有很大的影响。附加阻力的准确估计是精确计算EEDI系数的关键(MEPC第63届会议报告)。本文采用超置网格法对KCS(KRISO集装箱船)船体外形进行CFD(Computational Fluid Dynamics)仿真，以预测精确EEDI系数的附加阻力。将仿真结果与实验结果进行对比(Simonsen et al .， 2008[18])。
{"title":"CFD simulation of added resistance of ships in head sea for estimating energy efficiency design index","authors":"Seong-Oh Kim, Y. Ock, J. Heo, Jong-Chun Park, Hee-sung Shin, Seung-Keon Lee","doi":"10.1109/OCEANS-TAIPEI.2014.6964578","DOIUrl":"https://doi.org/10.1109/OCEANS-TAIPEI.2014.6964578","url":null,"abstract":"IMO(International Marine Organization) adopted the mandatory application of the EEDI(Energy Efficiency Design Index) for new ships in order to reduce the emissions of CO2(IMO, 2011). Added resistance, which is defined as an increased resistance of ships in waves, have a large effect on emissions of CO2. It is important that exact estimation of added resistance is essential for precise calculation of EEDI coefficient (MEPC 63rd session report). In the present study, CFD(Computational Fluid Dynamics) simulation using overset grid method is performed on KCS(KRISO Container Ship) hull form to predict added resistance for precise EEDI coefficient. Simulation results is compared to experimental result(Simonsen et al, 2008 [18]).","PeriodicalId":114739,"journal":{"name":"OCEANS 2014 - TAIPEI","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132809325","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 : 2014-04-07DOI: 10.1109/OCEANS-TAIPEI.2014.6964483
Arnau Carrera, N. Palomeras, D. Ribas, Petar Kormushev, M. Carreras
Intervention autonomous underwater vehicles (I-AUVs) are a promising platform to perform intervention task in underwater environments, replacing current methods like remotely operate underwater vehicles (ROVs) and manned sub-mersibles that are more expensive. This article proposes a complete system including all the necessary elements to perform a valve turning task using an I-AUV. The knowledge of an operator to perform the task is transmitted to an I-AUV by a learning by demonstration (LbD) algorithm. The algorithm learns the trajectory of the vehicle and the end-effector to accomplish the valve turning. The method has shown its feasibility in a controlled environment repeating the learned task with different valves and configurations.
{"title":"An Intervention-AUV learns how to perform an underwater valve turning","authors":"Arnau Carrera, N. Palomeras, D. Ribas, Petar Kormushev, M. Carreras","doi":"10.1109/OCEANS-TAIPEI.2014.6964483","DOIUrl":"https://doi.org/10.1109/OCEANS-TAIPEI.2014.6964483","url":null,"abstract":"Intervention autonomous underwater vehicles (I-AUVs) are a promising platform to perform intervention task in underwater environments, replacing current methods like remotely operate underwater vehicles (ROVs) and manned sub-mersibles that are more expensive. This article proposes a complete system including all the necessary elements to perform a valve turning task using an I-AUV. The knowledge of an operator to perform the task is transmitted to an I-AUV by a learning by demonstration (LbD) algorithm. The algorithm learns the trajectory of the vehicle and the end-effector to accomplish the valve turning. The method has shown its feasibility in a controlled environment repeating the learned task with different valves and configurations.","PeriodicalId":114739,"journal":{"name":"OCEANS 2014 - TAIPEI","volume":"312 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121071789","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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