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Revealing the Fluttering Motions of Mid-Water Trawl Codend Through sea trials:Case Study of Antarctic Krill Trawl Codend

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Journal of Ocean University of China 2023年第2期22卷 555-564页

作者： LIU Wei TANG Hao NYATCHOUBA NSANGUE Bruno Thierry ZHANG Feng YIN Liqiang XU Liuxiong HU Fuxiang LIU Pengfei College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China National Engineering Research Center for Oceanic Fisheries Shanghai 201306China Key Laboratory of Oceanic Fisheries Exploration Ministry of Agriculture and Rural AffairsShanghai 201306China The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources Shanghai Ocean UniversityMinistry of EducationShanghai 201306China Scientific Observing and Experimental Station of Oceanic Fishery Resources Ministry of Agriculture and Rural AffairsShanghai 201306China Faculty of Marine Science Tokyo University of Marine Science and TechnologyMinatoTokyo 108-8477Japan Tendering Office Shanghai Ocean UniversityShanghai 201306China

The dynamic coupling between the fluttering motions and hydrodynamic characteristics of codend is essential in understanding the trawl selectivity through fish response and the drag force acting on the whole *** study investigated the effect of towing speed,warp length,warp tension,and catch size on the fluttering motions of Antarctic krill trawl codend during net shooting,towing,and hauling by using sea trial *** time-periodicity of codend oscillation was analyzed by the Morlet wavelet transform *** indicated that the period of codend oscillation was between 50 s and 90 s and showed an increasing trend with the warp tension but a decreased value at the towing *** coefficient amplitude of codend oscillation was between 0 and 4 at the net shooting and hauling stages,and between 0.2 and 0.6 at the towing *** amplitude of codend oscillation increased with the warp tension,towing speed,and catch size,but decreased with the increase of the warp *** addition,the period of codend oscillation increased with the towing speed at the net shooting and hauling stages,but decreased at the towing *** results from codend fluttering motions can improve the understanding of fish behavior and gear shape that modify the hydrodynamic force on the codend instantaneously.

关键词： codend fluttering motions sea trials Morlet wavelet periodicity

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维普期刊数据库

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Energy saving by using asymmetric aftbodies for merchant ships–design methodology, numerical simulation and validation

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Journal of Hydrodynamics 2016年第6期28卷 1022-1028页

作者： Jie DANG 陈灏 Maritime Research Institute Netherlands (MARIN) Wageningen The Netherlands Guangzhou Shipyard International Company Ltd. Guangzhou 510382 China

The methodology and procedures are discussed on designing merchant ships to achieve fully-integrated and optimized hull-propulsion systems by using asymmetric aftbodies. Computational fluid dynamics （CFD） has been used to evaluate the powering performance through massive calculations with automatic deformation algorisms for the hull forms and the propeller blades. Comparative model tests of the designs to the optimized symmetric hull forms have been carried out to verify the efficiency gain. More than 6% improvement on the propulsive efficiency of an oil tanker has been measured during the model tests. Dedicated sea-trials show good agreement with the predicted performance from the test results.

关键词： energy saving hull form asymmetric aftbody model tests sea trials

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维普期刊数据库

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Study and innovation of a flexible blade turbine,a new type of tidal current generating device

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Engineering Sciences 2010年第1期8卷 11-15,21页

作者： Wang Shujie Li Dong Li Huajun Yuan Peng Tan Junzhe Song Lina College of Engineering Ocean University of China Qingdao 266100 China

Utilization of tidal current is becoming a focus of marine energy research and development field. In this paper, a new type of tidal current power generating device which was called flexible blade turbine was put forward. A scale model testing was carried out, and results show that the models performed as expected with good hydrodynamic characteristics. Based on analysis of the results, a scale model turbine with a rated power of 5 kW was constructed, which was an optimal scheme of the flexible blade turbine having higher coefficient of power and power generation capacity. sea trials were carried out in the Zhaitang Island Channel to evaluate the performance of the turbine. Results show that the turbine performed well, generating the power predicted.

关键词： tidal current flexible blade turbine coefficient of power sea trials

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Validation of an Emission Model for a Marine Diesel Engine with Data from sea Operations

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Journal of Marine Science and Application 2021年第3期20卷 534-545页

作者： Luigia Mocerino CGuedes Soares Enrico Rizzuto Flavio Balsamo Franco Quaranta Department of Industrial Engineering University of Naples Federico II80125 NaplesItaly Centre for Marine Technology and Ocean Engineering(CENTEC) Instituto Superior TécnicoUniversidade de LisboaLisbonPortugal Department of Electrical ElectronicTelecommunications Engineering&Naval ArchitectureUniversity of GenoaGenoaItaly

In this study,a model is developed to simulate the dynamics of an internal combustion engine,and it is calibrated and validated against reliable experimental data,making it a tool that can effectively be adopted to conduct emission *** this work,the Ricardo WAVE software is applied to the simulation of a particular marine diesel engine,a four-stroke engine used in the maritime *** from the bench tests are used for the calibration of the ***,the calibration of the model and its validation with full-scale data measured at sea are *** prediction includes not only the classic engine operating parameters for a comparison with surveys but also an estimate of nitrogen oxide emissions,which are compared with similar results obtained with emission *** calibration of the model made it possible to obtain an overlap between the simulation results and real data with an average error of approximately 7%on power,torque,and *** model provides encouraging results,suggesting further applications,such as in the study on transient conditions,coupling of the engine model with the ship model for a complete simulation of the operating conditions,and optimization studies on consumption and *** availability of the emission data during the sea trial and validated simulation results are the strengths and novelties of this work.

关键词： Simulation Marine diesel engine model Four-stroke engine Exhaust emissions Nitrogen oxide emissions sea trials

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Design and Optimization of Strapdown Fiber Optic Gyro Compass System

Design and Optimization of Strapdown Fiber Optic Gyro Compas...

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第43届中国控制会议

作者： Jinyue Zhao Kunpeng He Le Kang Xiangdong Wang College of Artificial Intelligence Nankai University

In order to meet the requirements of the SINS navigation system,including high accuracy,low power consumption,and miniaturization,an embedded navigation computer system based on DSP and FPGA has been *** overall structure of the navigation computer system is initially described,and a comprehensive design plan for the navigation computer hardware is proposed,encompassing the navigation information processing module and the data acquisition and communication *** principle of initial alignment for the strapdown gyrocompass is then studied and analyzed,and the gyrocompass alignment technology is investigated based on the compass loop.A specific implementation algorithm is subsequently ***,the design includes a three-axis swing test and a sea alignment *** effectiveness of the proposed scheme is verified through the sea alignment test plan,where GPS position and log velocity are utilized to assist in the alignment process.

关键词： Navigation Computer DSP FPGA Gyrocompass Self-alignment sea trials

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