Pub Date : 2019-06-17DOI: 10.1109/OCEANSE.2019.8867576
P. Major, Shuai Yuan, Houxiang Zhang, Inge Blaalid, Mathieu Edet, Martin Ferstad
Flexible riser installations or replacements are operations which need to be accurately planned and trained for. Virtual prototyping (VP) allows engineers to interact with simulation tools in real time (RT) during the planning phase, thereby finding optimal solutions and enhancing operational procedures in terms of safety and speed. Literature research has found scarce publication of simulation of flexible riser installation operations. This study compares the outcomes of a RT VP with a benchmark based on the finite element method. The approach presented throughout this paper can provide some suggestions with respect to the installation of a flexible pipe in practical engineering.
{"title":"Flexible Riser Installation Optimisation Based on Virtual Prototyping","authors":"P. Major, Shuai Yuan, Houxiang Zhang, Inge Blaalid, Mathieu Edet, Martin Ferstad","doi":"10.1109/OCEANSE.2019.8867576","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867576","url":null,"abstract":"Flexible riser installations or replacements are operations which need to be accurately planned and trained for. Virtual prototyping (VP) allows engineers to interact with simulation tools in real time (RT) during the planning phase, thereby finding optimal solutions and enhancing operational procedures in terms of safety and speed. Literature research has found scarce publication of simulation of flexible riser installation operations. This study compares the outcomes of a RT VP with a benchmark based on the finite element method. The approach presented throughout this paper can provide some suggestions with respect to the installation of a flexible pipe in practical engineering.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126404005","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 : 2019-06-17DOI: 10.1109/OCEANSE.2019.8867445
Huu-Tho Dang, L. Lapierre, R. Zapata, P. Lépinay, Benoit Ropars
This paper presents the properties and design procedure of the configuration matrix of over-actuated marine systems. Performance indices introduced in manipulator robots are extended in over-actuated marine vehicles. Moreover, two novel indices, namely reactive index and robust index, are proposed for configuration matrix design process. The problem is formulated as a multi-objective optimization problem. Simulation and preliminary experimental results show the solutions of the design process.
{"title":"Configuration Matrix Design of Over-Actuated Marine Systems","authors":"Huu-Tho Dang, L. Lapierre, R. Zapata, P. Lépinay, Benoit Ropars","doi":"10.1109/OCEANSE.2019.8867445","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867445","url":null,"abstract":"This paper presents the properties and design procedure of the configuration matrix of over-actuated marine systems. Performance indices introduced in manipulator robots are extended in over-actuated marine vehicles. Moreover, two novel indices, namely reactive index and robust index, are proposed for configuration matrix design process. The problem is formulated as a multi-objective optimization problem. Simulation and preliminary experimental results show the solutions of the design process.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130612587","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 : 2019-06-17DOI: 10.1109/OCEANSE.2019.8867157
G. Finger, Michèle Martina Schaub, F. Dahms, E. Hassel, Tino Riebe, G. Milbradt, K. Wehner
Shipping in concerns of eco-friendly and economical efficient operation can be achieved by many different measures. Most of them are technological approaches, e.g. by changing engine control parameters, usage of different fuels, exhaust gas-treatment systems or internal measures to make the engine itself more efficient or eco-friendly. The lost part in this measures is, that there are still humans who are in charge of controlling the vessel and that they should be kept in the loop of efficiency. For numerous vessels, it is neither efficient nor economically reasonable to exchange or enhance the existing power generation or propulsion systems in order to improve efficiency or reduce emissions. Some internal measures even lead to a higher fuel consumption in order to reduce NOx-emissions.Therefore optimal operational procedures for handling ships and specifically the outcome of engine manoeuvres is a substantial source for eco-friendly ship operations. The German research project MEmBran (Modelling Emissions and Fuel Consumption during Ship Manoeuvres) addresses especially the basis for optimising ship engine manoeuvres. It focusses on a very detailed simulation of the processes of currently existing ship diesel engines (in a first step 4-stroke engines) in order to apply them within a more comprehensive ship handling simulation software. As a part of an existing planning and prediction software that can be used on board, it enables the watchkeeping nautical officer and the shipping company to forecast and compare the fuel consumption of the ship for each manoeuvre. It further allows to identify the best option of the ship operator’s possible actions under several conditions and afterwards a comparison of varying manoeuvre strategies of different navigators will be enabled.
{"title":"On-Board Support System for the eco-friendly ship operation in coastal and port areas","authors":"G. Finger, Michèle Martina Schaub, F. Dahms, E. Hassel, Tino Riebe, G. Milbradt, K. Wehner","doi":"10.1109/OCEANSE.2019.8867157","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867157","url":null,"abstract":"Shipping in concerns of eco-friendly and economical efficient operation can be achieved by many different measures. Most of them are technological approaches, e.g. by changing engine control parameters, usage of different fuels, exhaust gas-treatment systems or internal measures to make the engine itself more efficient or eco-friendly. The lost part in this measures is, that there are still humans who are in charge of controlling the vessel and that they should be kept in the loop of efficiency. For numerous vessels, it is neither efficient nor economically reasonable to exchange or enhance the existing power generation or propulsion systems in order to improve efficiency or reduce emissions. Some internal measures even lead to a higher fuel consumption in order to reduce NOx-emissions.Therefore optimal operational procedures for handling ships and specifically the outcome of engine manoeuvres is a substantial source for eco-friendly ship operations. The German research project MEmBran (Modelling Emissions and Fuel Consumption during Ship Manoeuvres) addresses especially the basis for optimising ship engine manoeuvres. It focusses on a very detailed simulation of the processes of currently existing ship diesel engines (in a first step 4-stroke engines) in order to apply them within a more comprehensive ship handling simulation software. As a part of an existing planning and prediction software that can be used on board, it enables the watchkeeping nautical officer and the shipping company to forecast and compare the fuel consumption of the ship for each manoeuvre. It further allows to identify the best option of the ship operator’s possible actions under several conditions and afterwards a comparison of varying manoeuvre strategies of different navigators will be enabled.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"96 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121002796","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 : 2019-06-17DOI: 10.1109/OCEANSE.2019.8867453
S. Bonnieux, Sébastien Mosser, M. Blay-Fornarino, Y. Hello, G. Nolet
Monitoring of the oceans with autonomous floats is of great interest for many disciplines. Monitoring on a global scale needs a multidisciplinary approach to be affordable. For this purpose, we propose an approach that allows oceanographers from different specialities to develop applications for autonomous floats. However, developing such applications usually requires expertise in embedded systems, and they must be reliable and efficient with regards to the limited resources of the floats (e.g., energy, processing power). We have followed a Model Driven Engineering approach composed of i) a Domain Specific Language to allow oceanographers to develop applications, ii) analysis tools to ensure that applications are efficient and reliable, iii) a composition tool to allow the deployment of different applications on a same float, and iv) a code generator that produce efficient and reliable code for the float. We present our approach with a biological and a seismological application. We validate it with technical metrics and an experiment.
{"title":"Model driven programming of autonomous floats for multidisciplinary monitoring of the oceans","authors":"S. Bonnieux, Sébastien Mosser, M. Blay-Fornarino, Y. Hello, G. Nolet","doi":"10.1109/OCEANSE.2019.8867453","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867453","url":null,"abstract":"Monitoring of the oceans with autonomous floats is of great interest for many disciplines. Monitoring on a global scale needs a multidisciplinary approach to be affordable. For this purpose, we propose an approach that allows oceanographers from different specialities to develop applications for autonomous floats. However, developing such applications usually requires expertise in embedded systems, and they must be reliable and efficient with regards to the limited resources of the floats (e.g., energy, processing power). We have followed a Model Driven Engineering approach composed of i) a Domain Specific Language to allow oceanographers to develop applications, ii) analysis tools to ensure that applications are efficient and reliable, iii) a composition tool to allow the deployment of different applications on a same float, and iv) a code generator that produce efficient and reliable code for the float. We present our approach with a biological and a seismological application. We validate it with technical metrics and an experiment.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131264362","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 : 2019-06-17DOI: 10.1109/OCEANSE.2019.8867288
M. Skaldebø, Albert Sans Muntadas, I. Schjølberg
This paper investigates a method for reducing the reality gap that occurs when applying simulated data in training for vision-based operations in a subsea environment. The distinction in knowledge in the simulated and real domains is denoted the reality gap. The objective of the presented work is to adapt and test a method for transferring knowledge obtained in a simulated environment into the real environment. The main method in focus is the machine learning framework CycleGAN, mapping desired features in order to recreate environments. The overall goal is to enable a framework trained in a simulated environment to recognize the desired features when applied in the real world. The performance of the learning transfer is measured by the ability to recreate the different environments from new test data. The obtained results demonstrates that the CycleGAN framework is able to map features characteristic for an underwater environment presented with the unlabeled datasets. Evaluation metrics, such as Average precision (AP) or FCN-score can be used to further evaluate the results. Moreover, this requires labeled data, which provides additional development of the current datasets.
{"title":"Transfer Learning in Underwater Operations","authors":"M. Skaldebø, Albert Sans Muntadas, I. Schjølberg","doi":"10.1109/OCEANSE.2019.8867288","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867288","url":null,"abstract":"This paper investigates a method for reducing the reality gap that occurs when applying simulated data in training for vision-based operations in a subsea environment. The distinction in knowledge in the simulated and real domains is denoted the reality gap. The objective of the presented work is to adapt and test a method for transferring knowledge obtained in a simulated environment into the real environment. The main method in focus is the machine learning framework CycleGAN, mapping desired features in order to recreate environments. The overall goal is to enable a framework trained in a simulated environment to recognize the desired features when applied in the real world. The performance of the learning transfer is measured by the ability to recreate the different environments from new test data. The obtained results demonstrates that the CycleGAN framework is able to map features characteristic for an underwater environment presented with the unlabeled datasets. Evaluation metrics, such as Average precision (AP) or FCN-score can be used to further evaluate the results. Moreover, this requires labeled data, which provides additional development of the current datasets.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132522412","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 : 2019-06-17DOI: 10.1109/OCEANSE.2019.8867171
Li Huangfu, Hongyu Chen, Xuemin Shan, Huanghui Zhang, Jiangqiao Li, Yang Ju, T. Ma, Jiawei Ren
New acquisition technologies that measure more than one wavefield component at the streamers are now available. We analyze how the frequency of input data limits the resolution of the final image and introduce a method using acceleration data as input data to improve the resolution for full waveform inversion (FWI). The FWI using acceleration data is achieved by defining of the misfit function and the construction of gradient. Using synthetic data examples, we show that FWI with acceleration data has the potential to improve the resolution of the inverted model with an optimal rate of convengence.
{"title":"Inversion with acceleration data: Theoretical development and numerical implementation","authors":"Li Huangfu, Hongyu Chen, Xuemin Shan, Huanghui Zhang, Jiangqiao Li, Yang Ju, T. Ma, Jiawei Ren","doi":"10.1109/OCEANSE.2019.8867171","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867171","url":null,"abstract":"New acquisition technologies that measure more than one wavefield component at the streamers are now available. We analyze how the frequency of input data limits the resolution of the final image and introduce a method using acceleration data as input data to improve the resolution for full waveform inversion (FWI). The FWI using acceleration data is achieved by defining of the misfit function and the construction of gradient. Using synthetic data examples, we show that FWI with acceleration data has the potential to improve the resolution of the inverted model with an optimal rate of convengence.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114521192","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 : 2019-06-17DOI: 10.1109/OCEANSE.2019.8867218
Y. Marcon, E. Kopiske, Tom Leymann, U. Spiesecke, Vincent Vittori, Till von Wahl, P. Wintersteller, C. Waldmann, G. Bohrmann
Natural methane gas release from the seafloor is a widespread phenomenon that occurs at cold seeps along most continental margins. Since their discovery in the early 1980s, seeps have been the focus of intensive research, partly aimed to refine the global carbon budget. However, deep-sea research is challenging and expensive and, to date, few works have successfully monitored the variability of methane gas release over long periods of time (> 1 year). Long-term monitoring is necessary to study the mechanisms that control seabed gas release. In 2017, the University of Bremen initiated the M3 project, which aims to study the temporal and spatial variability of gas emissions at the Southern Hydrate Ridge by acoustically monitoring gas effluxes over several years. Located at 800 m depth on the Cascadia accretionary prism offshore Oregon, the Southern Hydrate Ridge is one of the most studied seep sites where persistent but variable gas release has been observed for more than 20 years. We present the Southern Hydrate Ridge Overview Sonar, a long-range multibeam echosounder mounted on a rotator, which detects every gas bubble stream, or bubble plume, located in the study area. Built to resist to the harsh, corrosive conditions of the deep- sea, the instrument aims to produce data time-series that span over several years. It is powered and controlled from land through the Ocean Observatories Initiative’s Cabled Array observatory. The sonar was deployed and connected to the Cabled Array in June 2018 and started collecting data at fixed time intervals. This paper describes the design of the sonar, the dataflow, the post-processing steps that are required to process the enormous amount of data produced, as well as some preliminary data products.
{"title":"A Rotary Sonar for Long-Term Acoustic Monitoring of Deep-Sea Gas Emissions","authors":"Y. Marcon, E. Kopiske, Tom Leymann, U. Spiesecke, Vincent Vittori, Till von Wahl, P. Wintersteller, C. Waldmann, G. Bohrmann","doi":"10.1109/OCEANSE.2019.8867218","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867218","url":null,"abstract":"Natural methane gas release from the seafloor is a widespread phenomenon that occurs at cold seeps along most continental margins. Since their discovery in the early 1980s, seeps have been the focus of intensive research, partly aimed to refine the global carbon budget. However, deep-sea research is challenging and expensive and, to date, few works have successfully monitored the variability of methane gas release over long periods of time (> 1 year). Long-term monitoring is necessary to study the mechanisms that control seabed gas release. In 2017, the University of Bremen initiated the M3 project, which aims to study the temporal and spatial variability of gas emissions at the Southern Hydrate Ridge by acoustically monitoring gas effluxes over several years. Located at 800 m depth on the Cascadia accretionary prism offshore Oregon, the Southern Hydrate Ridge is one of the most studied seep sites where persistent but variable gas release has been observed for more than 20 years. We present the Southern Hydrate Ridge Overview Sonar, a long-range multibeam echosounder mounted on a rotator, which detects every gas bubble stream, or bubble plume, located in the study area. Built to resist to the harsh, corrosive conditions of the deep- sea, the instrument aims to produce data time-series that span over several years. It is powered and controlled from land through the Ocean Observatories Initiative’s Cabled Array observatory. The sonar was deployed and connected to the Cabled Array in June 2018 and started collecting data at fixed time intervals. This paper describes the design of the sonar, the dataflow, the post-processing steps that are required to process the enormous amount of data produced, as well as some preliminary data products.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116244064","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 : 2019-06-17DOI: 10.1109/OCEANSE.2019.8867530
Yukun Zhang, Kunde Yang, Runze Xue, Chunlong Huang, Cheng Chen
Many studies have been conducted on acoustic propagation in different parts of the seas and oceans, and in this paper, the character of Convergence Zone (CZ) is analyzed in the front area of Kuroshio Extension. With cluster method and empirical orthogonal function decomposition method, formulas have been derived to get the grouped SSPs. After that an SSP field model based on Argo data is obtained by interpolation. On acoustic propagation path through the front area of Kuroshio Extension, character of convergence zone varies not only due to the continuously fluctuating depth of deep sound channel, which is dominated by the distribution and structure of Kuroshio Extension, but also affected by terrain, which has a strong impact to the characteristics and path of the KEF.
{"title":"Convergence zone analysis for a source in the front area of Kuroshio Extension based on Argo data","authors":"Yukun Zhang, Kunde Yang, Runze Xue, Chunlong Huang, Cheng Chen","doi":"10.1109/OCEANSE.2019.8867530","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867530","url":null,"abstract":"Many studies have been conducted on acoustic propagation in different parts of the seas and oceans, and in this paper, the character of Convergence Zone (CZ) is analyzed in the front area of Kuroshio Extension. With cluster method and empirical orthogonal function decomposition method, formulas have been derived to get the grouped SSPs. After that an SSP field model based on Argo data is obtained by interpolation. On acoustic propagation path through the front area of Kuroshio Extension, character of convergence zone varies not only due to the continuously fluctuating depth of deep sound channel, which is dominated by the distribution and structure of Kuroshio Extension, but also affected by terrain, which has a strong impact to the characteristics and path of the KEF.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131969879","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 : 2019-06-17DOI: 10.1109/OCEANSE.2019.8867340
Monica S. Li, Rene van der Zande, A. Hernandez-Agreda, P. Bongaerts, Hannah S. Stuart
A mechanism for gripping onto plating scleractinian mesophotic corals is designed, realized and tested, with the goal of collecting samples via human-portable ROVs. Rotation-constrained teeth are employed to grip onto these thin structures which are abundant with surface ridges and asperities. Anisotropic contact conditions allow for gripper positional error on initial approach and grasping; the device can increase grasp engagement passively, allowing plate-like objects to be easily pushed into the gripper with forces on the order of 1 N. Yet, the gripper can resist large pull-out forces, tested up to 57 N in the lab. The gripper design is integrated with an ROV, and its capabilities are qualitatively evaluated in field tests. These trials confirm overall expected performance given real-world disturbances and variability. This cheap, additive-manufactured technology is being developed in an effort to make the ocean more accessible for scientific research.
{"title":"Gripper Design with Rotation-Constrained Teeth for Mobile Manipulation of Hard, Plating Corals with Human-Portable ROVs","authors":"Monica S. Li, Rene van der Zande, A. Hernandez-Agreda, P. Bongaerts, Hannah S. Stuart","doi":"10.1109/OCEANSE.2019.8867340","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867340","url":null,"abstract":"A mechanism for gripping onto plating scleractinian mesophotic corals is designed, realized and tested, with the goal of collecting samples via human-portable ROVs. Rotation-constrained teeth are employed to grip onto these thin structures which are abundant with surface ridges and asperities. Anisotropic contact conditions allow for gripper positional error on initial approach and grasping; the device can increase grasp engagement passively, allowing plate-like objects to be easily pushed into the gripper with forces on the order of 1 N. Yet, the gripper can resist large pull-out forces, tested up to 57 N in the lab. The gripper design is integrated with an ROV, and its capabilities are qualitatively evaluated in field tests. These trials confirm overall expected performance given real-world disturbances and variability. This cheap, additive-manufactured technology is being developed in an effort to make the ocean more accessible for scientific research.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"55 10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134536344","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 : 2019-06-17DOI: 10.1109/OCEANSE.2019.8867281
Chunlong Huang, Kunde Yang, Runze Xue, Yukun Zhang
Considering that the marine environment is complex and in order to overcome the difference between the buoyancy and the gravity of the underwater vehicle, there will be a certain attack angle between the axisymmetric body and its heading. It results in a certain angle between the direction of incoming stream and the axis of the axisymmetric body. This paper focuses on analyzing the velocity and pressure fields of axisymmetric body at different motion attitudes. It can be found that the pressure coefficient and velocity are distributed identically in the circumferential direction when the axisymmetric body is in attitude B. The pressure coefficient is smaller and the velocity is larger at the lower part of the head curved surface (S2) of the axisymmetric body when the axisymmetric body is in attitude A. When the axisymmetric body is in attitude C, the pressure coefficient is smaller and the velocity is larger at the upper part of the head curved surface (S3) of the body. Corresponding, the value of the sound pressure level of the flow noise and the radiation direction of the flow noise are different.
{"title":"Analysis of Velocity and Pressure Fields for an Axisymmetric Body in Water at Different Motion Attitudes","authors":"Chunlong Huang, Kunde Yang, Runze Xue, Yukun Zhang","doi":"10.1109/OCEANSE.2019.8867281","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867281","url":null,"abstract":"Considering that the marine environment is complex and in order to overcome the difference between the buoyancy and the gravity of the underwater vehicle, there will be a certain attack angle between the axisymmetric body and its heading. It results in a certain angle between the direction of incoming stream and the axis of the axisymmetric body. This paper focuses on analyzing the velocity and pressure fields of axisymmetric body at different motion attitudes. It can be found that the pressure coefficient and velocity are distributed identically in the circumferential direction when the axisymmetric body is in attitude B. The pressure coefficient is smaller and the velocity is larger at the lower part of the head curved surface (S2) of the axisymmetric body when the axisymmetric body is in attitude A. When the axisymmetric body is in attitude C, the pressure coefficient is smaller and the velocity is larger at the upper part of the head curved surface (S3) of the body. Corresponding, the value of the sound pressure level of the flow noise and the radiation direction of the flow noise are different.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133717686","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：