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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.Research to date has mainly focused on the detection of above-water-level cracks and hasn’t consideredthe large scale cracks.In this paper, a large-scale underwater crack examination method is proposed based on image stitching

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

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Detection for transverse corner cracks of steel plates’ surface using wavelet

Qiong ZHOU, Qi AN

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 2,   Pages 224-227 doi: 10.1007/s11465-009-0017-x

Abstract: An algorithm is presented for detecting transverse corner cracks at a steel plate surface using waveletThe experiment shows that transverse corner cracks of steel plates can be more effectively extracted

Keywords： transverse corner cracks     defect detection     multi-scales wavelet analysis    

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Microbial self-healing of cracks in cement-based materials and its influencing factors

Frontiers of Structural and Civil Engineering doi: 10.1007/s11709-023-0986-6

Abstract: Cracks can reduce service life because the transport of harmful substances can cause corrosion damagemethod, numerical modeling, and ultrasonic method can be employed to identify the self-healing effect of cracksThe results showed that microbial self-healing agents can repair cracks in cement-based materials inThe difficulties and future development of self-healing cracks were analyzed.With the development of intelligent building materials, self-healing cracks have become the focus of

Keywords： cement-based materials     cracks     microbial self-healing agent     mechanism     intelligent building materials    

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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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Fatigue crack growth simulations of 3-D linear elastic cracks under thermal load by XFEM

Himanshu PATHAK,Akhilendra SINGH,I.V. SINGH,S. K. YADAV

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 4,   Pages 359-382 doi: 10.1007/s11709-015-0304-z

Abstract: This paper deals with the fatigue crack growth simulations of three-dimensional linear elastic cracksDifferent crack geometries such as planer, non-planer and arbitrary spline shape cracks are simulated

Keywords： 3-D cracks     fatigue life     Paris law     thermal load     XFEM    

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Investigation of Generalized SIFs of cracks in 3D piezoelectric media under various crack-face conditions

Jaroon RUNGAMORNRAT, Bounsana CHANSAVANG, Weeraporn PHONGTINNABOOT, Chung Nguyen VAN

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 2,   Pages 280-298 doi: 10.1007/s11709-019-0586-7

Abstract: and the permittivity of a medium inside the crack gap on intensity factors of planar and non-planar cracksThe mode-I stress intensity factors ( ) for two representative non-planar cracks under different crack-faceIn addition, for impermeable and semi-permeable non-planar cracks treated depends strongly on the electricfield whereas those of impermeable, permeable, and semi-permeable penny-shaped cracks are identicaland dependent on the electric field for the penny-shaped crack and the two representative non-planar cracks

Keywords： crack-face conditions     intensity factors     non-flat cracks     permittivity     piezoelectric media     SGBEM    

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Fast detection algorithm for cracks on tunnel linings based on deep semantic segmentation

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 5,   Pages 732-744 doi: 10.1007/s11709-023-0965-y

Abstract: deep semantic segmentation called LC-DeepLab is proposed for detecting the trends and geometries of cracksThe experimental results show that LC-DeepLab can accurately segment and highlight cracks from tunnel

Keywords： tunnel engineering     crack segmentation     fast detection     DeepLabv3+     feature fusion     attention mechanism    

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Ductile extension of 3-D external circumferential cracks in pipe structures

Wuchao YANG, Xudong QIAN

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 3,   Pages 294-303 doi: 10.1007/s11709-011-0115-9

Abstract: This study investigates the ductile fracture resistance of 3-D external circumferential cracks in theaxi-symmetric model provides conservative estimations of the fracture resistance for 3-D circumferential cracks

Keywords： ductile fracture     computational cell method     G-T model     J-R curve    

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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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Effect of calcium lactate on compressive strength and self-healing of cracks in microbial concrete

Kunamineni VIJAY, Meena MURMU

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 3,   Pages 515-525 doi: 10.1007/s11709-018-0494-2

Abstract: The influence of this addition on compressive strength, self-healing capability of cracks is highlighted

Keywords： calcium lactate     bacillus subtilis     compressive strength     self-healing of cracks    

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Fracture behavior of two non-symmetrical collinear cracks emanating from an elliptical hole in a piezoelectric

Junhong GUO, Zixing LU

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 3,   Pages 296-300 doi: 10.1007/s11465-011-0236-9

Abstract: Stroh-type formalism and the technique of conformal mapping, the problem of two non-symmetrical collinear cracksand anti-plane mechanical loading, which allowed us to take the electric field inside the hole and cracks

Keywords： piezoelectric materials     elliptical hole     semi-permeable crack     energy release rate     analytic solution    

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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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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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Title Author Date Type Operation

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

Wenxuan CAO; Junjie LI

Journal Article

Detection for transverse corner cracks of steel plates’ surface using wavelet

Qiong ZHOU, Qi AN

Journal Article

Microbial self-healing of cracks in cement-based materials and its influencing factors

Journal Article

Turbidity-adaptive underwater image enhancement method using image fusion

Journal Article

Fatigue crack growth simulations of 3-D linear elastic cracks under thermal load by XFEM

Himanshu PATHAK,Akhilendra SINGH,I.V. SINGH,S. K. YADAV

Journal Article

Investigation of Generalized SIFs of cracks in 3D piezoelectric media under various crack-face conditions

Jaroon RUNGAMORNRAT, Bounsana CHANSAVANG, Weeraporn PHONGTINNABOOT, Chung Nguyen VAN

Journal Article

Fast detection algorithm for cracks on tunnel linings based on deep semantic segmentation

Journal Article

Ductile extension of 3-D external circumferential cracks in pipe structures

Wuchao YANG, Xudong QIAN

Journal Article

Design and construction technology of underwater tunnel

Wang Mengshu

Journal Article

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

Zhijie HUANG, Xiaodan REN, Zuyu CHEN, Daosheng LING

Journal Article

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

Hai YANG, Jie MA,

Journal Article

Effect of calcium lactate on compressive strength and self-healing of cracks in microbial concrete

Kunamineni VIJAY, Meena MURMU

Journal Article

Fracture behavior of two non-symmetrical collinear cracks emanating from an elliptical hole in a piezoelectric

Junhong GUO, Zixing LU

Journal Article

Aslotted floor acquisitionmultiple access based MACprotocol for underwater acoustic networks withRTS

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

Journal Article

Development of Marine Equipment for Underwater Stereoscopic Observation

Ma Rui, Zhao Xiutao, Liu Cungen

Journal Article