2013 IEEE International Underwater Technology Symposium (UT)最新文献

{"title":"Underwater glider ‘SOARER’ for ocean environmental monitoring","authors":"M. Arima, H. Tonai, Y. Kosuga","doi":"10.1109/UT.2013.6519878","DOIUrl":"https://doi.org/10.1109/UT.2013.6519878","url":null,"abstract":"Underwater glider is one of the most practical and useful autonomous underwater vehicles. Power-driven propulsive machinery is not essential for underwater glider, so that it is applicable to long-term and wide-range operation. Furthermore, this silent and safe underwater vehicle can be maintained with relatively ease and is easy on ocean environment and many forms of life in the sea. An ocean-going underwater glider with independently controllable main wings for the use of ocean-environment monitoring has been developed. This paper deals with tank test and sea trials of the ocean-going underwater glider with independently controllable main wings, named `SOARER'. A simple cylindrical shape with NACA0030-shaped nose and tail cones and tapered main wings with NACA0009 section were adopted for improving the hydrodynamic performance. Main wings, upper rudder, diving rudder (elevator), movable balance weight, and sea-water pump for ballast tank can be controlled by on-board microcomputer system. Three axes acceleration, three axes angular velocity, depth and direction by magnetic compass during cruise can be measured for the use of feedback control. SOARER is navigated by dead reckoning under water, but accurate position can be obtained by using GPS when it is on the surface. These navigation data are transmitted from flight recorder to PC station by wireless LAN system when on the surface. The SOARER glider is equipped with the stand-alone ocean-environment monitoring profiler, `RINKO-Profiler' of JFE Advantech Co., Ltd. Its measuring items are depth, temperature, conductivity, salinity, dissolved oxygen, chlorophyll and turbidity.","PeriodicalId":354995,"journal":{"name":"2013 IEEE International Underwater Technology Symposium (UT)","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122960453","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}

{"title":"Developing near-bottom magnetic measurements using a 3D forward modeling technique: Application to hydrothermal vent fields","authors":"M. Fujii, K. Okino, C. Honsho, J. Dyment, S. Florent, N. Mochizuki","doi":"10.1109/UT.2013.6519860","DOIUrl":"https://doi.org/10.1109/UT.2013.6519860","url":null,"abstract":"We developed a method for mapping the magnetic structure of absolute magnetization on the seafloor using a three-dimensional forward modeling technique and near-bottom vector magnetic data. We constrained the spatial scale of hydrothermal alteration zones in a back-arc spreading axis of the Southern Mariana Trough. The magnetic signatures of hydrothermal alteration zones are characterized by low magnetization similar to that in mid-ocean ridge vent sites.","PeriodicalId":354995,"journal":{"name":"2013 IEEE International Underwater Technology Symposium (UT)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123812311","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}

{"title":"An evaluation about the performance of a hydrophone on seafloor","authors":"S. Nishida, K. Kawaguchi, T. Imaizumi, T. Akamatsu","doi":"10.1109/UT.2013.6519885","DOIUrl":"https://doi.org/10.1109/UT.2013.6519885","url":null,"abstract":"DONET (Dense Ocean-floor Network system for Earthquakes and Tsunamis) is a submarine cabled real-time observation network for earthquakes and tsunamis monitoring around the Nankai trough, southwestern Japan. The scheduled twenty observatories have operated since August 2011. Various sensors such as a broadband seismometer, a pressure gauge, a hydrophone, etc. are equipped with each observatory, because DONET has expected to obtain the data to understand the Nankai trough mega thrust earthquake seismogenic zones. Therefore, in order to supply data stably, it's important to have a method of an investigation of the performance of each sensor in DONET. In this research, we will evaluate the performance of a hydrophone of DONET. The reference hydrophone was installed several meters from an observatory of DONET. Here, it assumes that both hydrophones will record the acoustic data according to same sound source. And, we will evaluate the performance of a hydrophone by the comparison between reference hydrophone and DONET's one in actual field, and will report the result of the evaluations.","PeriodicalId":354995,"journal":{"name":"2013 IEEE International Underwater Technology Symposium (UT)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125270235","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}

{"title":"A preliminary study on multi-view video streaming over underwater acoustic networks","authors":"T. Fujihashi, Hai-Heng Ng, Ziyuan Pan, S. Saruwatari, H. Tan, T. Watanabe","doi":"10.1109/UT.2013.6519832","DOIUrl":"https://doi.org/10.1109/UT.2013.6519832","url":null,"abstract":"Several techniques to realize multi-view video streaming have been recently proposed for terrestrial wireless networks. Multi-view video allows users to watch object of interest from different angle and can be applied to many applications. Nonetheless, the existing techniques do not cater for high-latency networks, such as underwater acoustic networks. Due to the slow speed of sound in water, the response delay of multi-view video becomes longer, which in turn degrades users' experience. This paper proposes a new approach, called Feedback-based Multi-view video Streaming for Underwater Acoustic Networks (FMS-UAN) so as to reduce the response delay of multi-view video streaming. FMS-UAN has two unique features. First, a sender can transmit its predicted frames before receiving feedback frame from a receiver node. We exploit long propagation delay by allowing both sender and receiver to simultaneously transmit their respective frames to each other in a collision-free manner. Second, even if the prediction was wrong, the sender still can encode the correct frame area with transmitted frames to reduce the retransmission bit-rate.","PeriodicalId":354995,"journal":{"name":"2013 IEEE International Underwater Technology Symposium (UT)","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122916061","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}

{"title":"Small scale reciprocal sound propagation analysis in Hashirimizu port","authors":"H. Ogasawara, S. Kamimura, K. Mori, T. Nakamura","doi":"10.1109/UT.2013.6519868","DOIUrl":"https://doi.org/10.1109/UT.2013.6519868","url":null,"abstract":"Small scale reciprocal sound propagation was carried out at Hashirimizu port in front of Tokyo Bay, Japan. A pair of the transducers with the distance about 120 m was set at the bank of the port. The average depth at the area is about 4 m. There were so many surface and bottom reflections. In this study, authors investigate the effects of ocean changes such as temperature, tidal level and current, to the reciprocal sound propagations. The 7th order M-sequence was sent every 5 minutes with carrier frequency of 80 kHz. The travel time mainly varied according to the water temperature. But sometimes, it shifted rapidly which could not be considered the effect of the water temperature. As there was almost 1.5 m depth changes because of the tide, the strength of receiving signals also changed according to the interferences of surface and bottom reflections. The biggest peak of the correlated signal was shifted under the conditions of the depth and temperature. It was also confirmed by calculations by finite-difference time-domain (FDTD) method. Because of these complicated interference, it was difficult to estimate current along the propagation path although it was improved by the peak tracing method. But there is still possibility to monitor water flows with few transducers. This method will be possible to monitor the average changes along the sound propagation area. Moreover, it will enable to monitor more accurate temperature or flow distributions using more transducers to create tomography system in the future.","PeriodicalId":354995,"journal":{"name":"2013 IEEE International Underwater Technology Symposium (UT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131208511","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}

{"title":"Docking method for hovering type AUVs by acoustic and visual positioning","authors":"T. Maki, R. Shiroku, Y. Sato, T. Matsuda, T. Sakamaki, T. Ura","doi":"10.1109/UT.2013.6519905","DOIUrl":"https://doi.org/10.1109/UT.2013.6519905","url":null,"abstract":"We propose a docking method for a hovering type AUVs at a seafloor station. Although hovering type AUVs are suitable for detailed surveys of local area, docking methods are currently less studied compared with ones for cruising type AUVs. This paper proposes a docking method for hovering type AUVs based on both the acoustic and visual positioning. The proposed method was implemented in the AUV Tri-TON and a trial station in order to verify its performance through tank experiments. The vehicle succeeded in docking at the station 13 times, which accounts for half of the total number of trials. The possible causes of the failures and improvement methods are also discussed.","PeriodicalId":354995,"journal":{"name":"2013 IEEE International Underwater Technology Symposium (UT)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132937554","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}

{"title":"Development and deployment of the long-term in-situ observation system of the Irrawaddy dolphins (Orcaella brevirostris) in Borneo","authors":"H. Sugimatsu, J. Kojima, T. Ura, S. Hiryu, R. Bahl, S. Behera, A. Pattnaik, I. Mandan, S. Tomuro, D. Kreb","doi":"10.1109/UT.2013.6519818","DOIUrl":"https://doi.org/10.1109/UT.2013.6519818","url":null,"abstract":"Irrawaddy dolphins are wildly distributed in Asian rivers, lakes and coastal areas. Unfortunately, their population is drastically reducing especially in river areas. Approximately 70-80 Irrawaddy dolphins divided into groups inhabit a 180km stretch of the up-river district of the Mahakam river in Borneo. For understanding the trend of some dolphin groups' migration pattern from Semayang Lake to up/down stream of the river and their echolocation strategy, the stationary observatory using an existing floating house was developed in December 2011 and its first long-term in-situ monitoring was conducted for 3 months in 2012. Taking advantage of the floating house observation platform on the river, one SBL system which consists of a three-piece set of SSBL units with environmental sensors were used for the recording system. In the Mahakam river, boat traffic is steadily increasing. Not only for understanding the trend of the dolphin's migration but also for evaluation of increasing boat noise effect on their echolocation ability, basic acoustic characteristics of the dolphin's echolocation clicks and two typical types of boat noise pulses (type A and type B) were revealed to classify dolphin clicks accurately from boat noise.","PeriodicalId":354995,"journal":{"name":"2013 IEEE International Underwater Technology Symposium (UT)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114244668","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}

{"title":"Challenges in realizing robust systems for deep water submersible ROSUB6000","authors":"N. Vedachalam, R. Ramesh, S. Ramesh, D. Sathianarayanan, A. Subramaniam, G. Harikrishnan, S. Pranesh, V. Jyothi, T. Chowdhury, G. Ramadass, M. Atmanand","doi":"10.1109/UT.2013.6519861","DOIUrl":"https://doi.org/10.1109/UT.2013.6519861","url":null,"abstract":"This paper presents the experiences in realizing robust systems for the 6000 meters depth rated electric work class Remotely Operated Vehicle ROSUB6000, designed and developed by National Institute of Ocean Technology(NIOT), India for applications like carrying out surveys for seabed bathymetry, gas hydrate identification, support vehicle for poly-metallic nodule exploration, and salvage support operations. The ROSUB system comprises Remotely Operable Vehicle (ROV), Tether Management System (TMS), Launching and Recovery System (LARS), Ship Systems and Control console. The electric work class ROV is equipped with two manipulators and an additional pay load capability of 150 kg. Robustness for the ROV is a key factor as deep water operations are critical in terms of ship time involved, nature of activities and intervention demands. The system was qualified at a water depth of 5289 meters in Central Indian Ocean Basin. Multiple challenges were faced during system qualifying sea trials in the areas of communication networks, navigation, thrusters, ROV-TMS docking, power system protection, vision systems, control software, and system safety. Problems were addressed by improvised system engineering and by means of introducing redundancies taking into consideration the cost, space and time constraints to attain optimum level of robustness and the availability of component. A super-capacitor aided, pressure-compensated switchgear is designed and implemented to achieve compactness and robustness. The probable loss of navigational information data from the photonic inertial navigation instrument and tether cable twist count data during power outages are managed using a sea battery. The reduced optical performance of the TMS Fiber Optic Rotary Joint in deep waters is analyzed and improved. Water entry in the pressure rated electronic enclosures was managed using water entry detectors and by implementing appropriate control algorithms using distributed controllers in ROV, TMS and the ship. Imaging system performance was improved with enhanced electronics architecture and advanced luminaries. Brushless direct current thruster motor controllers are protected for over voltages using voltage management systems in the ship, TMS and ROV. To reduce the chance of ROV-TMS docking failure in the absence of vision systems, black dock systems incorporated. A ROV-TMS serial data link was introduced to manage critical operations in the ROV during fiber optic network failures. Pilot and Co-Pilot automatic control changeover is implemented by using control software with continuous monitoring.","PeriodicalId":354995,"journal":{"name":"2013 IEEE International Underwater Technology Symposium (UT)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114584275","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}

{"title":"Development of unmanned inspection equipment for underwater damages of harbor facilities","authors":"C. Shin, Sang‐Hun Han, I. Jang, Kihun Kim, W. Baek","doi":"10.1109/UT.2013.6519857","DOIUrl":"https://doi.org/10.1109/UT.2013.6519857","url":null,"abstract":"In Korea, the old harbor facilities are increasing. Thus, damages of the structures are easily induced due to unexpected accidents such as natural disasters. These damages of the structures can be reduced by the continuous maintenance of the facilities. A project in Korea recently commenced to develop and make practicable unmanned inspection equipment for underwater damages of harbor structures to increase the work effectiveness and human safety in underwater. Also, it can reduce the continuous maintenance cost. In this study, the specification of the equipment and concept design were determined for the parts of mobility mechanism, underwater positioning, and inspection method. The model was manufactured and tested in a lab water tank. The results of this research can be expected to increase the underwater work effectiveness and to practically utilize to the real field for inspection of the underwater damages of harbor facilities with the developed equipment.","PeriodicalId":354995,"journal":{"name":"2013 IEEE International Underwater Technology Symposium (UT)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124664834","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}

{"title":"Performance qualification of instrumentation, telemetry & data acquisition system for underwater mining machine with manganese nodule collection and crushing system","authors":"P. Muthuvel, B. O. Vishwanath, R. Ramesh, K. Jayanthi, T. Sasikala, S. Rajesh, V. Nidhi, C. R. Deepak, M. Atmanand","doi":"10.1109/UT.2013.6519871","DOIUrl":"https://doi.org/10.1109/UT.2013.6519871","url":null,"abstract":"An underwater mining system has been developed for mining polymetallic modules and qualified in shallow water at 512m depth. The mining system has a remotely operable underwater mining machine which collects seabed nodules, crushes and pumps the same through a flexible riser to the mother ship. The machine is equipped with Acoustic Positioning system, Altimeter, Doppler Velocity Log (DVL), Proximity sensors, Linear Variable Differential Transformer (LVDT), Pressure, Temperature, Motion Reference Unit (MRU), Underwater Camera and lamps for various measurement and operation of underwater mining machine. The machine was tested at Angira Bank off Malvan coast during Oct 2010. This paper presents the details of performance of various underwater sensors, Telemetry & Data Acquisition system at 512m depth. Based on the results from the tests, the next phase of 6000m operations is being attempted.","PeriodicalId":354995,"journal":{"name":"2013 IEEE International Underwater Technology Symposium (UT)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123856475","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}