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Detecting large-scale underwater cracks based on remote operated vehicle and graph convolutional neural

Wenxuan CAO; Junjie LI

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 11, Pages 1378-1396 doi: 10.1007/s11709-022-0855-8

Abstract: It is of great significance to quickly detect underwater cracks as they can seriously threaten the safetyof underwater structures.In this paper, a large-scale underwater crack examination method is proposed based on image stitchingIn addition, a purpose of this paper is to design a new convolution method to segment underwater imagesThe result shows that the improved APAP algorithm and GCN can adapt to complex underwater environments

Keywords： underwater cracks remote operated vehicle image stitching image segmentation graph convolutional

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Development of Marine Equipment for Underwater Stereoscopic Observation

Ma Rui, Zhao Xiutao, Liu Cungen

Strategic Study of CAE 2020, Volume 22, Issue 6, Pages 19-25 doi: 10.15302/J-SSCAE-2020.06.003

Abstract:

Establishing an underwater stereoscopic observation network to obtainThis study first analyzes the need and necessity of developing the underwater stereoscopic observationdevelopment, and presents the key breakthrough points of marine sensors which serve as the key link for underwatertransformation of research results of key marine sensors, coordinate the management of the marine equipment for underwater

Keywords： ocean observation sea floor observatory network underwater vehicle underwater sensor

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Robust global route planning for an autonomous underwater vehicle in a stochastic environment Research Article

Jiaxin ZHANG, Meiqin LIU, Senlin ZHANG, Ronghao ZHENG

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 11, Pages 1658-1672 doi: 10.1631/FITEE.2200026

Abstract:

This paper describes a route planner that enables an to selectively complete part of the predetermined tasks in the operating ocean area when the local path cost is stochastic. The problem is formulated as a variant of the . Based on the (GA), we propose the greedy strategy based GA (GGA) which includes a novel rebirth operator that maps infeasible individuals into the feasible solution space during evolution to improve the efficiency of the optimization, and use a differential evolution planner for providing the deterministic local path cost. The uncertainty of the local path cost comes from unpredictable obstacles, measurement error, and trajectory tracking error. To improve the robustness of the planner in an uncertain environment, a sampling strategy for path evaluation is designed, and the cost of a certain route is obtained by multiple sampling from the probability density functions of local paths. Monte Carlo simulations are used to verify the superiority and effectiveness of the planner. The promising simulation results show that the proposed GGA outperforms its counterparts by 4.7%–24.6% in terms of total profit, and the sampling-based GGA route planner (S-GGARP) improves the average profit by 5.5% compared to the GGA route planner (GGARP).

Keywords： Autonomous underwater vehicle Route planning Genetic algorithm Orienteering problem Stochastic path

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Turbidity-adaptive underwater image enhancement method using image fusion

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 3, doi: 10.1007/s11465-021-0669-8

Abstract: Clear, correct imaging is a prerequisite for underwater operations.Most of the existing underwater imaging methods focus on relatively clear underwater environment, itis uncertain that if those methods can work well in turbid and dynamic underwater environments.In this paper, we propose a turbidity-adaptive underwater image enhancement method.The proposed method is verified by an underwater image dataset captured in real underwater environment

Keywords： turbidity underwater image enhancement image fusion underwater robots visibility

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AUV Path Planning in 3D Seabed Environment Using Genetic Algorithm

Hao Yanling,Zhang Jingjuan

Strategic Study of CAE 2003, Volume 5, Issue 11, Pages 56-60

Abstract:

The path-planning algorithm of AUV in 3D seabed environment is studied. For 3D environment, the optimal paths are classified into three different types. The optimal paths of each type are obtained flexibly by using genetic algorithm, especially the incorporating of problem-specific knowledge and penalty function. Simulation results show the feasibility and reliability of the path-planning algorithm, which has considerable value on the safe navigation of AUV in seabed environment.

Keywords： 3D path planning genetic algorithm seabed terrain underwater vehicle

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Design and construction technology of underwater tunnel

Wang Mengshu

Strategic Study of CAE 2009, Volume 11, Issue 7, Pages 4-10

Abstract: text-align: justify;">It is briefly introduced that when passing over or crossing rivers, lakes and seas, underwaterof design and construction, key construction technology and frequently-used construction method of underwater

Keywords： underwater tunnel design construction

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Centrifuge experiment and numerical analysis of an air-backed plate subjected to underwater shock loading

Zhijie HUANG, Xiaodan REN, Zuyu CHEN, Daosheng LING

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 6, Pages 1350-1362 doi: 10.1007/s11709-019-0559-x

Abstract: experiments and numerical studies are conducted to investigate the effect of shock loads due to an underwaterNumerical simulations with three different models of pressure time history generated by underwater explosionThe second model to predict the time history of shock wave pressure from an underwater explosion was

Keywords： underwater explosion centrifuge experiment shock load dynamic response accumulated shock impulse

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Effects of thermocline on performance of underwater glider’s power system propelled by ocean thermal

Hai YANG, Jie MA,

Frontiers in Energy 2009, Volume 3, Issue 4, Pages 472-479 doi: 10.1007/s11708-009-0052-7

Abstract: Based on the enthalpy method, a mathematical model of the underwater glider’s power system wasthe time efficiency of operation was introduced, so that the effects of different thermoclines on the underwater

Keywords： mathematical underwater glider system working certain corresponding threshold

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Aslotted floor acquisitionmultiple access based MACprotocol for underwater acoustic networks withRTS

Liang-fang QIAN,Sen-lin ZHANG,Mei-qin LIU

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 3, Pages 217-226 doi: 10.1631/FITEE.1400187

Abstract: bandwidth, and high bit error rate pose great challenges in media access control (MAC) protocol design for underwaterA MAC protocol called slotted floor acquisition multiple access (slotted-FAMA) suitable for underwaterTo overcome this drawback, this paper proposes a slotted-FAMA based MAC protocol for underwater acoustic

Keywords： Underwater acoustic networks Medium access control (MAC) Request-to-send (RTS) competition Throughput

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Fabrication of a superhydrophilic/underwater superoleophobic stainless steel mesh for oil/water separation

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 1, Pages 46-55 doi: 10.1007/s11705-022-2170-2

Abstract: increasing amount of oily wastewater produced each day, it is important to develop superhydrophilic/underwaterIn this paper, a superhydrophilic/underwater superoleophobic N-isopropylacrylamide-coated stainless

Keywords： oil/water separation N-isopropylacrylamide stainless steel mesh ultrahigh flux

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Key technologic problems on underwater shield tunnel

Sun Mou,Tan Zhongsheng

Strategic Study of CAE 2009, Volume 11, Issue 7, Pages 18-23

Abstract:

Combined with some underwater shield tunnels such as Wuhan Changjiangpreventing tunnel floating, controlling shield direction, excavating long distance, abutting joint underwater

Keywords： underwater tunnel shield cover thickness type selection key construction technology

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best communication point for data collection from a seabed platform using a single unmanned surface vehicle Research Papers

Jiu-cai JIN, Jie ZHANG, Zhi-chao LV

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 6, Pages 751-759 doi: 10.1631/FITEE.1700732

Abstract: communication point is proposed for collecting data from a seabed platform by a single unmanned surface vehicle(USV) using underwater acoustic communication (UAC).A single vehicle cannot rapidly estimate the field because of the limited extent for measurement; therefore, it is difficult for a single vehicle to seek the extremum point in a field.

Keywords： Unmanned surface vehicle Data collection Underwater acoustic communication Gradient climbing Extremum

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Underwater Attack–Defense Confrontation System and Its Future Development

Xie Wei, Yang Meng, Gong Junbin

Strategic Study of CAE 2019, Volume 21, Issue 6, Pages 71-79 doi: 10.15302/J-SSCAE-2019.06.014

Abstract:

As an important development direction of naval warfare, the underwater attack–defense confrontationsystem integrates underwater warning, scout, detection, attack, defense and a series of other operationsCurrently, although underwater offensive and defensive weapons have developed rapidly, research on theThis paper first summarizes the status quo of underwater confrontation system construction in some militarypowers, and analyzes the functional composition and typical combat styles of the future underwater attack

Keywords： underwater attack and defense confrontation system coordinated combat unmanned system

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Hydrophilic/underwater superoleophobic graphene oxide membrane intercalated by TiO

Zhichao Wu, Chang Zhang, Kaiming Peng, Qiaoying Wang, Zhiwei Wang

Frontiers of Environmental Science & Engineering 2018, Volume 12, Issue 3, doi: 10.1007/s11783-018-1042-y

Abstract: In this study, the hydrophilic/underwater superoleophobic membrane with enhanced water permeability andGO/TiO membrane exhibits hydrophilic and underwater superoleophobic properties with water contact angle

Keywords： Hydrophilic Superoleophobic Graphene oxide Membrane Titanium dioxide nanotubes Oil-water separation

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Discussion on safety risk assessment of shield construction in underwater tunnel

Lu hao,Shi Yehui and Rong Xiaoli

Strategic Study of CAE 2013, Volume 15, Issue 10, Pages 91-96

Abstract: tunnels pass through rivers or lakes, so slurry shield method with large diameter is often used in the underwaterThe underwater tunnel with large diameter has the characteristics of high risk, difficult to control,Risk assessment is more and more applied in underwater tunnel construction safe management.The characteristics of using slurry shield with large diameter in underwater tunnel were introduced inThis method has been used in an underwater tunnel in Nanjing subway engineering, the application results

Keywords： underwater tunnel safety risk dynamic assessment