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Understanding the effect of cathodic reaction on corrosion-enhanced erosion in sand-entraining electrolyte

材料科学技术（英文版） 2025年第6期209卷 103-116页

作者： Qiliang Zhang Long Hao Wanbin Chen Yi Huang Yunze Xu State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentDalian University of TechnologyDalian 116024China School of Naval Architecture and Ocean Engineering Dalian University of TechnologyDalian 116024China State Key Laboratory for Corrosion and Protection Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

In this study,the pure erosion behaviour of pure iron and its erosion-corrosion behaviour under different anodic polarization currents were investigated in various cathodic reactions(oxygen reduction,hydrogen ion reduction,and water reduction)using a cylindrical stirring *** corrosion-enhanced erosion(C-E)rates were determined for each *** results revealed that pure iron displayed similar pure erosion behaviour across all three cathodic *** the cathodic reactions involve hydrogen ion reduction or water reduction,the erosion-corrosion of pure iron manifested as uniform damage,with the reduction in hardness being the main cause of the C-E in this ***,in the case of oxy-gen reduction reaction as the cathodic reaction,the erosion-corrosion presented as pitting damage,with the reduction in hardness resulting from localized concentration of anodic current and the formation of easily worn protruding flaky iron structures at the edges of the pits as the main mechanism of the ***,linear and exponential relationships were found between the C-E rate and the anodic current density for uniform damage and pitting damage,***,the concept of surface equivalent hardness was proposed,along with the establishment of a mathematical model for surface equivalent hardness based on the relationships between the C-E rate and the anodic current *** the surface equivalent hardness enables the evaluation of the erosion rate on material surfaces considering the coupled effect.

关键词： Corrosion-enhanced erosion Cathodic reaction Pitting damage Uniform damage Hardness

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Understanding and probing progression of localized corrosion on inner walls of steel pipelines:an overview

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Journal of Iron and Steel Research International 2025年第1期32卷 1-18页

作者： Ming-yu Wang Hai-yuan Yao Yong-fei Liu Ye-sen Zhu Wan-bin Chen Yun-ze Xu Yi Huang School of Naval Architecture and Ocean Engineering Dalian University of TechnologyDalian 116024LiaoningChina China National Offshore Oil Corporation Research Institute Co. Ltd.Beijing 100028China State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentDalian University of TechnologyDalian 116024LiaoningChina

Corrosion poses a major threat to the safety of transportation ***,it is crucial to have an in-depth understanding of corrosion mechanisms in pipeline steels for the effective management of pipeline *** research on corrosion mechanisms relies on the use of efficient and reliable corrosion monitoring and analysis *** advancements in corrosion monitoring techniques specifically designed for the localized corrosion monitoring were aimed to be introduced,and a comprehensive overview of recent progress in understanding the localized corrosion mechanisms in pipeline steels was *** on the different corrosive environments encountered,the localized corrosion issues inside pipelines are classified into two categories:localized corrosion primarily influenced by electrochemical processes and localized corrosion controlled by both electrochemical and mechanical ***,a thorough analysis of the synergistic effects between micro-cell and macro-cell currents,as well as the interplay of mechanics and electrochemistry is ***,recommendations for future research on the mechanisms of internal localized corrosion in pipelines are provided.

关键词： Pipeline steel Localized corrosion Corrosion type Corrosion monitoring Corrosion mechanism

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RGB-Based Category-Level Object Pose Estimation via Depth Recovery and Adaptive Refinement

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IEEE Robotics and Automation Letters 2025年第6期10卷 5377-5384页

作者： Yang, Hui Sun, Wei Liu, Jian Zheng, Jin Zeng, Zhiwen Mian, Ajmal Hunan University National Engineering Research Center for Robot Visual Perception and Control Technology College of Electrical and Information Engineering Changsha410082 China Hunan University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Changsha410082 China Central South University School of Architecture and Art Changsha410082 China University of Western Australia Department of Computer Science and Software Engineering CrawleyWA6009 Australia

Category-level pose estimation methods have received widespread attention as they can be generalized to intra-class unseen objects. Although RGB-D-based category-level methods have made significant progress, reliance on depth image limits practical application. RGB-based methods offer a more practical and cost-effective solution. However, current RGB-based methods struggle with object geometry perception, leading to inaccurate pose estimation. We propose depth recovery and adaptive refinement for category-level object pose estimation from a single RGB image. We leverage DINOv2 to reconstruct the coarse scene-level depth from the input RGB image and propose an adaptive refinement network based on an encoder-decoder architecture to dynamically improve the predicted coarse depth and reduce its gap from the ground truth. We introduce a 2D–3D consistency loss to ensure correspondence between the point cloud obtained from depth projection and the objects in the 2D image. This consistency supervision enables the model to maintain alignment between the depth image and the point cloud. Finally, we extract features from the refined point cloud and feed them into two confidence-aware rotation regression branches and a translation and size prediction residual branch for end-to-end training. Decoupling the rotation matrix provides a more direct representation, which facilitates parameter optimization and gradient propagation. Extensive experiments on the REAL275 and CAMERA25 datasets demonstrate the superior performance of our method. Real-world estimation and robotic grasping experiments demonstrate our model robustness to occlusion, clutter environments, and low-textured objects. Our code and robotic grasping video are available at DA-Pose. © 2016 IEEE.

关键词： Depth perception

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Numerical investigation of collection parameters on hydraulic collection and flow field characteristics for the dual-jets based technology

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Ocean Engineering 2025年 328卷

作者： Dong, Yanqing Zou, Li Sun, Tiezhi Jin, Guoqing Yu, Zongbing State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial Equipment Dalian116024 China School of Naval Architecture Dalian University of Technology Dalian116024 China Guangzhou511458 China

In the context of polymetallic nodule collection, current mainstream research focuses on hydraulic collection methods. Among these, the dual jets hydraulic collection method stands out for its high collection efficiency. In this study, the dual jets collection method is investigated using orthogonal design methodology to formulate 25 sets of cases for five collection parameters. (jet velocity, suction velocity, height above bottom, jet angle, and nozzle spacing). Through numerical simulation, the characteristics of vertical force on fixed particle at the bottom and the flow characteristics derived from various cases are investigated. Employing the intuitive analytical approach, a comprehensive sensitivity analysis on the five collection parameters is performed. Subsequent analysis of variance confirmed that jet velocity is a dominant factor influencing the relative vertical impulse (I) exerted on stationary particle. On this basis, an analysis of the impact of key factor on collection capability is conducted, thereby identifying the effective value scope for the key parameters. © 2025

关键词： Sensitivity analysis

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Towards Expanding Precise Timing for Collaborative Its with Deterministic Communications in 6G

Towards Expanding Precise Timing for Collaborative Its with ...

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IEEE Conference on Wireless Communications and Networking

作者： Hongxing Li Haotian Li Qianhan Gao Guochu Shou Yaqiong Liu Zhigang Guo Yihong Hu State Key Laboratory of Networking and Switching Technology School of Computer Science (National Pilot Software Engineering School) Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China

ISBN: (数字)9798350368369

ISBN: (纸本)9798350368376

The demand for precise timing continues to grow with the rapid development of smart cities, where intelligent transportation emerges as a critical application heavily dependent on accurate time distribution. Deterministic communication is anticipated to be a defining feature of nextgeneration mobile networks (6G), enabling end-to-end timecritical applications, and unlocking new possibilities for achieving end-to-end precise time synchronization as well. To cope with the challenge of delivering precise time synchronization across broader areas at a lower cost, this paper proposes a method to achieve end-to-end precise time synchronization by leveraging the deterministic characteristics of communication networks. Specially, the proposed approach adopts the software-Defined Networking (SDN) paradigm to implement deterministic networking for the seamless integration of Time-Sensitive Networking (TSN) and cellular networks. Furthermore, to mitigate the impact of wireless channel uncertainties on synchronization accuracy, we propose a network delay measurement mechanism based on the principle of time redundancy, designed to reduce end-to-end network delay variation. Experimental results validate the effectiveness of the proposed method, demonstrating its capability to constrain the end-to-end relative time error of wired and wireless converged networks to the microsecond scale, without necessitating modifications to the existing network infrastructure.

关键词： 6G mobile communication Wireless communication Cellular networks Uncertainty Accuracy Measurement uncertainty Transportation Delays Synchronization software defined networking

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Multimodal Contrastive Learning for 3D Object Classification and Part-Segmentation by Leveraging V-LLM and CNNs

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Photogrammetric Record 2025年第190期40卷

作者： Jiang, Jiaxin Gong, Jun Ke, Shengnan Li, Xiaoming Zhao, Zhigang Luo, Jianjun Tang, Shengjun School of Software Jiangxi Normal University Nanchang China Research Institute for Smart Cities School of Architecture and Urban Planning Shenzhen University Shenzhen China State Key Laboratory of Subtropical Building and Urban Science Shenzhen University Shenzhen China

Visual–Linguistic large models (V-LLMs) have demonstrated strong semantic understanding capabilities in understanding visual open-world scenes. However, there is limited research on how to effectively integrate these models with traditional deep learning networks for classify and segment 3D point clouds. This paper explores the joint training mechanisms of V-VLLMs and Convolutional Neural Networks (CNNs), constructing a pluggable module that enhances 3D object classification and component segmentation using 2D images, 3D point clouds, and language descriptions. The idea of this pluggable module is to employ contrastive learning between the generalized features extracted by large models from text and image features extracted by the CNN to enhance the robustness and understanding accuracy of the original CNN-based point cloud network. For experiments, we validated the effectiveness and accuracy of the proposed pluggable module using multiple point cloud classification frameworks, based on datasets such as ModelNet40, ScanObjectNN, and ShapeNetCore. The experimental results demonstrate that the multimodal contrastive learning pluggable module significantly enhances performance across various deep learning frameworks, resulting in significant enhancements in classification and segmentation precision. Additionally, for the multiscale feature PointNet++ framework, the proposed multiscale contrastive learning mechanism provides further performance gains. The Code is available at https://***/winbigqian/MCL-3D-VCNN. © 2025 Remote Sensing and Photogrammetry Society and John Wiley & Sons Ltd.

关键词： Contrastive Learning

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Constraint effects on the hydroelasticity of very large floating structures

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Ocean Engineering 2025年 331卷

作者： Zhang, Guiyong Li, Qiankun Jiang, Changqing el Moctar, Ould Sun, Zhe State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial Equipment School of Naval Architecture Engineering Dalian University of Technology Dalian116024 China Institute of Sustainable and Autonomous Maritime Systems University of Duisburg-Essen Duisburg47057 Germany

Offshore structures are continuously subjected to wave-induced loads, resulting in both rigid-body motion and elastic deformation. In very large floating structures (VLFSs), hydroelastic deformation is primarily characterized by vertical displacement, encompassing both oscillatory motion and flexible deflection. Hydroelastic analysis typically involves imposing constraints to restrict body motion in waves, which can significantly influence deformation behavior. To assess the impact of these constraints, this study examines how different boundary conditions affect the hydroelastic response of VLFSs. Specifically, five test cases with distinct constraint conditions are designed to systematically evaluate their effects across multiple wavelengths. A coupled numerical methodology integrating computational fluid dynamics (CFD) and computational structural dynamics (CSD) is developed to analyze hydroelastic deformation under these conditions. Strain distributions at key locations along the floating structure are examined under varying wave conditions. Results indicate that spring constraints provide a stable deformation pattern, aligning well with physical expectations in both long and short waves. This study highlights the critical role of constraint selection in VLFS modeling and suggests that future research should explore multi-directional wave effects and diverse restraint configurations to enhance VLFS design and performance. © 2025 The Author(s)

关键词： Offshore structures

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Damage characteristics of typical structures subjected to underwater contact explosion of array charges

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Physics of Fluids 2025年第4期37卷

作者： Zhang, Zhifan Zhao, Yuxi Wang, Longkan Sui, Yutong Li, Bing Li, Tao State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial Equipment School of Naval Architecture Engineering Dalian University of Technology Dalian116024 China China Ship Research and Development Academy Beijing100192 China 91439 Troops Liaoning Dalian116041 China School of Mechanical Engineering Key Laboratory of Advanced Intelligent Protective Equipment Technology Ministry of Education Hebei University of Technology Tianjin300401 China

This paper studies the damage characteristics of underwater explosions on typical underwater structures with array charges, using both experimental and numerical methods. A small-scale explosion experiment is conducted in a water tank to compare the damage effects of single-charge and array charge explosions under contact explosion conditions. Subsequently, numerical methods are used to analyze the effects of array spacing and detonation distance on the damage characteristics of array charges under full-scale conditions. A damage model for typical cylindrical shell structures under underwater contact explosions with array charges is established. The rupture width and deflection are used as characteristic parameters to investigate the damage effect. The results show that, under specific array spacing and detonation distance conditions, array charges exhibit significant energy concentration and enhanced damage effects. When the radius-to-distance ratio is 6, the damage effect is up to 48.3% higher than that of a single charge with equal mass. When the detonation distance exceeds 70 cm, the damage effect gradually decreases as the radius-to-distance ratio increases. Under the same damage mode, the pulsating jet load accounts for a large proportion of the damage, which increases as the detonation distance increases. © 2025 Author(s).

关键词： Detonation

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Experimental study of damage to double-hull structure by underwater explosions of three charge types - blasting, shaped, and linear shaped charges

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International Journal of Impact Engineering 2025年 203卷

作者： Zhang, Zhifan Yang, Shuxin Zhang, Shenhe Wang, Longkan Sui, Yutong Li, Tao Zhang, Guiyong State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial Equipment School of Naval Architecture Engineering Dalian University of Technology Dalian116024 China China Ship Research and Development Academy Beijing100192 China School of Mechanical Engineering Key Laboratory of Advanced Intelligent Protective Equipment Technology Ministry of Education Hebei University of Technology Tianjin300401 China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai 200240 China

In recent years, due to the improvement in ship protection capabilities, near-field underwater explosions no longer pose fatal damage to ships. Since stiffened plates are typical structures in ships, studying the impact of underwater explosions with different types of explosives on ships is of great significance. This experiment investigated the damage characteristics of blasting, shaped, and linear shaped charges on the same type of stiffened plate. The experimental results indicate that linear shaped charges can create larger penetration holes on target plates, but they suffer from insufficient flight capability. In contrast, shaped charges exhibit stronger penetrating power, yet they lack sufficient damage capability against target plates. Although the penetration capability of blasting charges is inferior to the first two, its overall deflection of the plate frame exceeds that caused by shaped charges and linear shaped charges by 1.6 % and 5.7 %, respectively. To further investigate the penetration process and the load characteristics of the penetrator, a finite element model was established in this paper. The numerical results show that there is no significant difference in jet length and velocity between the two models, but the shapes of the jet tips differ, and the computational results are in good agreement with the experimental results, confirming the validity of the Arbitrary Lagrangian-Eulerian (ALE) method. © 2025 Elsevier Ltd

关键词： Underwater explosions

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TPU Nonwoven Fabrics Enhanced the Erosion Resistance and Interlaminar Fracture Toughness of CF/EP Composites

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Journal of Applied Polymer Science 2025年

作者： Zhang, Jiale Lu, Yukun Li, Zhaoyang Fang, Mei College of Architecture & Civil Engineering Shangqiu Normal University Shangqiu China State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial Equipment National Engineering Research Center for Advanced Polymer Processing Technology Zhengzhou University Zhengzhou China

Carbon fiber-reinforced polymer composites (CFRPs) are extensively employed in engineering applications owing to their exceptional strength-to-weight ratio and outstanding fatigue resistance. Nevertheless, when utilized in critical components such as aircraft wings, wind turbine blades, and structural elements, their performance and durability are frequently degraded by harsh environmental conditions. To address these challenges, thermoplastic polyurethane (TPU) nonwoven fabric was introduced as an interlayer in carbon fiber/epoxy (CF/EP) composites to improve both erosion resistance and interlaminar fracture toughness. Experimental investigations revealed remarkable enhancements in mechanical properties: the CF/TPU/EP composites exhibited a 28.6% increase in maximum load, an 11.8% improvement in tensile strength, and a substantial 45.3% augmentation in bending load compared to conventional CF/EP composites. Moreover, the erosion resistance demonstrated progressive enhancement with increasing impact angles (30° to 90°), showing improvements of 58%, 130%, 185%, 227%, and 292%, respectively. These results clearly demonstrate that the TPU-modified composites achieve superior interlaminar toughness while maintaining excellent mechanical performance. The significant improvements in both mechanical properties and erosion resistance suggest that CF/TPU/EP composites possess considerable potential for demanding applications in aerospace, marine, and construction engineering, particularly under severe service conditions. © 2025 Wiley Periodicals LLC.

关键词： Fracture toughness

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