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

Frontiers of Structural and Civil engineering 2022年第11期16卷 1378-1396页

作者： Wenxuan CAO Junjie LI Faculty of Infrastructure Engineering Dalian University of TechnologyDalian 116024China College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing 210098China

It is of great significance to quickly detect underwater cracks as they can seriously threaten the safety of underwater *** to date has mainly focused on the detection of above-water-level cracks and hasn’t considered the large scale *** this paper,a large-scale underwater crack examination method is proposed based on image stitching and *** addition,a purpose of this paper is to design a new convolution method to segment underwater *** improved As-Projective-As-Possible(APAP)algorithm was designed to extract and stitch keyframes from *** graph convolutional neural network(GCN)was used to segment the stitched *** GCN’s m-IOU is 24.02%higher than Fully convolutional networks(FCN),proving that GCN has great potential of application in image segmentation and underwater image *** result shows that the improved APAP algorithm and GCN can adapt to complex underwater environments and perform well in different study areas.

关键词： underwater cracks remote operated vehicle image stitching image segmentation graph convolutional neural network

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Microstrip Moisture Sensor for Wheat Grains Analysis and Development 3

Microstrip Moisture Sensor for Wheat Grains Analysis and Dev...

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3rd IEEE International Maghreb Meeting of the Conference on Sciences and Techniques of Automatic Control and Computer engineering, MI-STA 2023

作者： Ghola, Hayat A. Emhemed Jafari, Fariba College of Electronic Technology - Tripoli Communications Department Tripoli Libya Infrastructure University Kuala Lumpur Faculty of Engineering and Technology Infrastructure Kajang Malaysia

ISBN: (纸本)9798350319897

A multi-layered microstrip moisture sensor which is built an inexpensive microwave sensor for nondestructive and rapid sensing for particulate and granular materials to find of moisture content has been tested by using three types of wheat grains. The sensor was made from inexpensive material namely RT Duroid 5880, aluminum and plastic paper. The structure of the sensor consists of three layers namely grain layer, a protective layer, and a substrate layer. It designed by NI AWR Design Environment software at 9.2 GHz. The attenuation of wheat grain samples are measured by the sensor using network analyzer and compared with the results obtained from the software which is calculated using the dielectric mixture equation and dielectric properties measured by Open Ended Coaxial Probe. The data and graphs displayed a wide bandwidth of moisture content. This model is suitable for a range of moisture content of wheat grains as it could be validated in the range starting from 10% until 20.6% (wet basis) and attenuation ranging from 3.2 dB to 8.6 dB for three types of samples. It has been rated using conventional criteria, root mean square error (RMSE), standard error of performance (SEP) and correlation coefficient (R2). This microwave sensor prototype provides the analysis with acceptable accuracy. © 2023 IEEE.

关键词： Microwave sensors

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Effect of Tension on the Undrained Pullout Capacity of Plate Anchors in Clay 33rd

Effect of Tension on the Undrained Pullout Capacity of Plate...

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33rd International Ocean and Polar engineering Conference, ISOPE 2023

作者： Chen, Quanzhen Wang, Yifa Tian, Yinghui Cassidy, Mark J. Department of Infrastructure Engineering Faculty of Engineering and Information Technology The University of Melbourne MelbourneVIC Australia

ISBN: (纸本)9781880653807

Floating facilities with mooring systems have been widely applied in the offshore oil and gas sector and are a viable solution for exploiting offshore wind and wave renewable energy. Plate anchors, an efficient foundation type embedded in the seabed and connected to mooring lines, provide high pullout capacity for floating structures. The evaluation of the undrained pullout capacity of plate anchors in clay is simplified into two extreme categories, namely, immediate breakaway and no breakaway, which correspond to zero and infinite tensile capacity at the anchor-soil interface. In reality, intermediate tension could be triggered at the base of the anchor between those two extremes. This study uses finite element (FE) analyses and a user-defined model of the anchor-soil interface to investigate the effect of tension on the uplift behaviour of plate anchors in undrained clay. The contribution of the interface tension on the pullout capacity is demonstrated, and soil failure mechanisms are investigated. The pullout capacity factors that are influenced by different interface tensile capacities are between the two breakaway conditions. A critical tension factor is defined beyond which no further capacity can be gained from the interface tension. The results allow for the evaluation of the actual pullout capacity of plate anchors with different magnitudes of tension beneath the anchor. © 2023 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Soils

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Utilization of lime-mixed geopolymerized rice husk ash (LGR) for balanced amelioration of collapsible soil

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Journal of Rock Mechanics and Geotechnical engineering 2025年第6期17卷 3925-3949页

作者： Shah, Mudassar Munir Li, Hong Department of Civil Engineering Faculty of Infrastructure Dalian University of Technology Dalian 116024 China Key Laboratory of Deep Earth Science and Engineering Sichuan University Chengdu 610065 China

Structures constructed on collapsible soil are prone to failure under flooding. Agro-waste like rice husk ash (RHA) and its geopolymer (LGR), consisting of lime (L), RHA, water glass (Na₂SiO₃), and caustic soda (NaOH), present a potential solution to address this issue. RHA and LGR were mixed up to 16% to improve the collapsible soil. Samples were remolded at optimal water content and maximum dry density for strength and collapsible potential tests. Unconfined compressive strength, deformation modulus, and soaked California bearing ratio exhibit exponential improvement with the inclusion of LGR. Additionally, for comparison of microstructural characteristics, analyses involving energy-dispersive X-ray spectroscopy (EDAX) and scanning electron microscope (SEM) were conducted on both virgin and treated specimens. LGR resulted in the emergence of new peaks of sodium silicates and calcium silicates, as indicated by EDAX. The formation of H-C-A-S gel and H-N-A-S gel observed in SEM suggests the development of bonds among soil particles attributed to geopolymerization. SEM reveals the transformation of the inherent collapsible soil from a dispersed and silt-dominated structure to a reticulated structure devoid of micro-pores following the incorporation of LGR. A numerical model was constructed to forecast the performance of both virgin and stabilized collapsible soils under pre- and post-flooding conditions. The outcomes indicate an enhancement in the soil's bearing capacity upon stabilization with 12% LGR. The implementation of 12% LGR significantly resulted in a lower embodied energy-to-strength ratio, emissions-to-strength ratio, and relatively lower cost-to-strength ratio compared to the soil treated with 16% cement kiln dust (CKD). © 2025 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences

关键词： Agro-waste Carbon emissions Collapse potential Collapsible soil Embodied energy Microstructure

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An Optimized System of Random Forest Model by Global Harmony Search with Generalized Opposition-Based Learning for Forecasting TBM Advance Rate

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Computer Modeling in engineering & Sciences 2024年第3期138卷 2873-2897页

作者： Yingui Qiu Shuai Huang Danial Jahed Armaghani Biswajeet Pradhan Annan Zhou Jian Zhou School of Resources and Safety Engineering Central South UniversityChangsha410083China School of Civil and Environmental Engineering University of Technology SydneyNew South WalesAustralia Centre for Advanced Modelling and Geospatial Information Systems School of Civil and Environmental EngineeringFaculty of Engineering and Information TechnologyUniversity of Technology SydneyNew SouthWalesAustralia Civil and Infrastructure Engineering Discipline School of EngineeringRoyal Melbourne Institute of Technology(RMIT)MelbourneVictoria3001Australia

As massive underground projects have become popular in dense urban cities,a problem has arisen:which model predicts the best for Tunnel Boring Machine(TBM)performance in these tunneling projects?However,performance level of TBMs in complex geological conditions is still a great challenge for practitioners and *** the other hand,a reliable and accurate prediction of TBM performance is essential to planning an applicable tunnel construction *** performance of TBM is very difficult to estimate due to various geotechnical and geological factors and machine *** previously-proposed intelligent techniques in this field are mostly based on a single or base model with a low level of ***,this study aims to introduce a hybrid randomforest(RF)technique optimized by global harmony search with generalized oppositionbased learning(GOGHS)for forecasting TBM advance rate(AR).Optimizing the RF hyper-parameters in terms of,e.g.,tree number and maximum tree depth is the main objective of using the GOGHS-RF *** the modelling of this study,a comprehensive databasewith themost influential parameters onTBMtogetherwithTBM AR were used as input and output variables,*** examine the capability and power of the GOGHSRF model,three more hybrid models of particle swarm optimization-RF,genetic algorithm-RF and artificial bee colony-RF were also constructed to forecast TBM *** of the developed models was performed by calculating several performance indices,including determination coefficient(R2),root-mean-square-error(RMSE),and mean-absolute-percentage-error(MAPE).The results showed that theGOGHS-RF is a more accurate technique for estimatingTBMAR compared to the other applied *** newly-developedGOGHS-RFmodel enjoyed R2=0.9937 and 0.9844,respectively,for train and test stages,which are higher than a pre-developed ***,the importance of the input parameters was interpreted through the SHapley Additive exPlanations(SHA

关键词： Tunnel boring machine random forest GOGHS optimization PSO optimization GA optimization ABC optimization SHAP

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Numerical investigation on the aerodynamic performances of a twin-rotor vertical-axis wind turbine in motions of a floating platform 12

Numerical investigation on the aerodynamic performances of a...

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12th International Conference on Renewable Power Generation, RPG 2023

作者： Wang, Long Chen, Bing Faculty of Infrastructure Engineering Dalian University of Technology China School of Ocean Science and Technology Dalian University of Technology China

Compared with fixed bottom vertical axis wind turbines (VAWTs), floating VAWTs have greater development potential, but the movements of a floating platform can not only affect the aerodynamic loads, but also may alter the wake characteristics of the wind turbines. In this paper, a twin-rotor vertical axis wind turbine with a symmetrical NACA0021 airfoil profile, mounted on a semi-submersible platform is proposed. A counter-rotating configuration is adopted for the two rotors. A computational fluid dynamic (CFD) method is employed to solve Navies-Stokes equations, combined with a shear stress transport (SST) k-ω turbulence model. Considering surge and sway motions of the floating platform in extreme waves, a one-way coupling to the twin-rotor VAWT is implemented, in which the influence of the aerodynamic loads to that of the platform motion is ignored with the assumption that this effect is negligible, and the impacts of the coupling such as aerodynamic forces (torque, tangential force, normal forces) in various motion periods and amplitudes, are analysed in detail. © The Institution of engineering & technology 2023.

关键词： Computational fluid dynamics

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Dynamic Analysis of a 10 MW Floating Offshore Wind Turbine Considering the Tower and Platform Flexibility

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Journal of Ocean University of China 2024年第2期23卷 358-370页

作者： GAO Shan ZHANG Lixian SHI Wei WANG Wenhua WANG Bin LI Xin Key Laboratory of Far-Shore Wind Power Technology of Zhejiang Province Hangzhou 311122China State Key Laboratory of Coastal and Offshore Engineering Deepwater Engineering Research CenterDalian University of TechnologyDalian 116024China Powerchina Huadong Engineering Corporation Limited Hangzhou 311122China Faculty of Infrastructure Engineering Dalian University of TechnologyDalian 116024China Ningbo Institute of Dalian University of Technology Ningbo 315000China

Recently,semisubmersible floating offshore wind turbine technologies have received considerable *** the coupled simulation of semisubmersible floating offshore wind energy,the platform is usually considered a rigid model,which could affect the calculation accuracy of the dynamic *** dynamic responses of a TripleSpar floating offshore wind turbine equipped with a 10 MW offshore wind turbine are discussed *** simulation of a floating offshore wind turbine under regular waves,white noise waves,and combined wind-wave conditions is *** effects of the tower and platform flexibility on the motion and force responses of the TripleSpar semisubmersible floating offshore wind turbine are *** results show that the flexibility of the tower and platform can influence the dynamic responses of a TripleSpar semisubmersible floating offshore wind *** the flexibility of the tower and platform,the tower and platform pitch motions markedly increased compared with the fully rigid ***,the force responses,particularly for tower base loads,are considerably influenced by the flexibility of the tower and ***,the flexibility of the tower and platform for the coupled simulation of floating offshore wind turbines must be appropriately examined.

关键词： floating offshore wind turbine TripleSpar semisubmersible platform rigidity and flexibility platform coupled simulation

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Advances in magnesium-based bioresorbable cardiovascular stents: Surface engineering and clinical prospects

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Journal of Magnesium and Alloys 2025年第3期13卷 948-981页

作者： Ganesh Kumar Subham Preetam Arunima Pandey Nick Birbilis Saad Al-Saadi Pooria Pasbakhsh Mikhail Zheludkevich Poovarasi Balan Department of Chemical Engineering School of EngineeringMonash University Malaysia47500Bandar SunwaySelangorMalaysia Faculty of Science Engineering and Built EnvironmentDeakin UniversityWaurn PondsVICAustralia Department of Mechanical&Aerospace Engineering and Department of Chemical&Biological Engineering Monash UniversityVictoria 3800Australia Department of Infrastructure Engineering Faculty of Engineering and Information TechnologyThe University of MelbourneMelbourneVictoria 3010Australia Institute of Surface Science Helmholtz-Zentrum HereonGeesthacht21502Germany Medical Engineering and Technology Hub School of EngineeringMonash University Malaysia Department of Mechanical Engineering School of EngineeringMonash University Malaysia47500Bandar SunwayMalaysia

Magnesium(Mg)-based bioresorbable stents represent a potentially groundbreaking advancement in cardiovascular therapy;offering tem-porary vessel support and complete biodegradability—addressing limitations of traditional stents like in-stent restenosis and long-term ***,challenges such as rapid corrosion and suboptimal endothelialisation have hindered their clinical *** review highlights the latest breakthroughs in surface modiﬁcation,alloying,and coating strategies to enhance the mechanical integrity,corrosion resistance,and biocompatibility of Mg-based *** surface engineering techniques,including polymer and bioactive coatings,are ex-amined for their role in promoting endothelial healing and minimising inﬂammatory *** directions are proposed,focusing on personalised stent designs to optimize efﬁcacy and long-term outcomes,positioning Mg-based stents as a transformative solution in interventional cardiology.

关键词： Magnesium alloy Cardiovascular stent Surface modification Corrosion Biocompatibility Biomedical application

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Effect of vertical seismic on dynamic reliability analysis of 2D slopes considering the spatial variability of soil parameters 8th

Effect of vertical seismic on dynamic reliability analysis o...

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8th International Symposium on Reliability engineering and Risk Management, ISRERM 2022

作者： Li, Yichuan Pang, Rui Xu, Bin School of Hydraulic Engineering Faculty of Infrastructure Engineering Dalian University of Technology Dalian116024 China State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian116024 China

ISBN: (纸本)9789811851841

The instability of slopes caused by ground vibration will often bring great casualties and serious property losses. Hence, it is of great practical significance to evaluate the reliability of slope reasonably and accurately for the seismic design and the actual disaster prevention project. A lot of engineering practice and previous studies show that the spatial variability of soil and the vertical seismic both have an obvious influence on the reliability of slope among many factors affecting the reliability of slope. But currently, there is still little research considering the influence combined these two essential factors simultaneously. Therefore, this paper aims to study the influence of vertical ground motion on the reliability of two-dimensional slopes while considering the spatial variability of soil parameters. The change of factor safety due to the different direction sets of seismic (horizontal seismic, and combine both of the horizontal one and vertical one) has been mainly reported. Finally, based on the probability density evolution method, the dynamic reliability analysis and safety evaluation of the 2D slope is carried out. © 2022 ISRERM Organizers. Published by Research Publishing, Singapore.

关键词： Safety factor

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Comparison of Pile-Soil-Structure Interaction Modeling Techniques for A 10-MW Large-Scale Monopile Wind Turbine Model Under Wind and Wave Conditions

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China Ocean engineering 2023年第3期37卷 471-483页

作者： ZENG Yu-xin ZHANG Xiao-ming ZHANG Li-xian SHI Wei WANG Wen-hua LI Xin Hunan Provincial Key Laboratory of Key Technology on Hydropower Development Changsha 410014China PowerChina Zhongnan Engineering Corporation Limited Changsha 410021China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China DeepWater Engineering Research Centre Dalian University of TechnologyDalian 116024China Institute for Earthquake Engineering Faculty of Infrastructure EngineeringDalian University of TechnologyDalian 116024China

Considering the large diameter effect of piles,the influence of different pile-soil analysis methods on the design of monopile foundations for offshore wind turbines has become an urgent problem to be *** different pile-soil models were used to study a large 10 MW monopile wind *** modeling the three models in the SACS software,this paper analyzed the motion response of the overall structure under the conditions of wind and *** to the given working conditions,this paper concludes that under the condition of independent wind,the average value of the tower top x-displacement of the rigid connection method is the smalle st,and the standard deviation is the smallest under the condition of independent *** results obtained by the p-y curve method are the most conservative.

关键词： large-scale monopile offshore wind turbine pile-soil model wind-wave load combination

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