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Mitigating Visual Noise in Multimodal AI:Selective Visual Grounding for Multimodal Machine Translation 认领 引用
1
作者 Ki-Young Shin Soonmo Kwon Kyudong Park 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第7期1124-1139,共16页
Multimodal AI systems often suffer from“over-informing”,where excessive raw visual input introduces noise that distracts from task-relevant decisions.Motivated by selective human attention strategies,we propose ARS-... Multimodal AI systems often suffer from“over-informing”,where excessive raw visual input introduces noise that distracts from task-relevant decisions.Motivated by selective human attention strategies,we propose ARS-MMT(Attention and Reasoning through Source Sentences for Multimodal Machine Translation),an architecture that operationalizes a“look-and-think”pipeline:a source-language encoder first builds contextualized linguistic representations,a relation reasoning network then produces a query-conditioned visual channel,and a multimodal decoder generates the translation conditioned in parallel on the encoded text and on this visual channel.We quantify the contribution of the visual modality through a controlled ablation:zeroing visual features reduces BLEU by 0.81 on test_2016_flickr En-De,while shuffling visual features across the batch changes BLEU by only+0.01,indicating that the channel responds primarily to the presence of visual context rather than to its image-specific content.We additionally add a contemporary 7B-parameter vision–language baseline(LLaVA-1.5)and show that our compact 4.3M-parameter specialized model is competitive in-domain.To address the open question of whether per-region visual attention constitutes a faithful explanation in the multimodal-translation setting,we conduct a deletion/insertion AUC analysis and report a null result consistent with prior findings on text attention.We therefore characterize ARS-MMT as an architecture whose modality-level visual contribution is measurable but whose per-region attention is not by itself a faithful explanation;faithful per-region attribution is identified as a target for complementary explanation methods.We discuss implications for efficient and inspectable multimodal systems in engineering deployment. 展开更多
关键词 Explainable AI multimodal machine translation selective visual grounding attention faithfulness modality ablation vision–language models
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Research on grounding protection system of the central solenoid model coil of the CRAFT 认领 引用
2
作者 Bei YE Ge GAO +2 位作者 Shusheng WANG Ya LI Qian JIANG 《Plasma Science and Technology》 SCIE EI CSCD 2025年第4期81-87,共7页
This work presents a grounding protection system of the central solenoid model coil(CSMC)of the Comprehensive Research Facility for Fusion Technology(CRAFT).The scheme of neutral point voltage detections has been adop... This work presents a grounding protection system of the central solenoid model coil(CSMC)of the Comprehensive Research Facility for Fusion Technology(CRAFT).The scheme of neutral point voltage detections has been adopted in grounding protection system.Compared with the usual current acquisition,the measurement data is accurate,there is no redundant loop,and the economic benefit is high.In this study,the single-end and double-end grounding fault protections of superconducting magnet coil are analyzed,and the fault voltage and current under different fault conditions are calculated.The simulation model of CSMC magnet grounding fault is established,and the simulation results of the model are basically consistent with the theoretical calculation.Finally,a small capacity experiment platform is used to verify the function of the grounding protection system.The experimental results show that by comparing the neutral fault sampling voltage with the theoretical grounding protection threshold,the grounding protection system can effectively detect different types of grounding faults and transmit signals to the control system to protect the coils of superconducting magnets. 展开更多
关键词 single-end grounding double-end grounding grounding resistance fault voltage fast discharge unit(Some figures may appear in colour only in the online journal)
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Empowering Grounding DINO with MoE:An End-to-End Framework for Cross-Domain Few-Shot Object Detection 认领 引用 被引量：1
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作者 DONG Xiugang ZHANG Kaijin +2 位作者 NONG Qingpeng JU Minhan TU Yaofeng 《ZTE Communications》 2025年第4期77-85,共9页
Open-set object detectors,as exemplified by Grounding DINO,have attracted significant attention due to their remarkable perfor⁃mance on in-domain datasets like Common Objects in Context(COCO)after only few-shot fine-t... Open-set object detectors,as exemplified by Grounding DINO,have attracted significant attention due to their remarkable perfor⁃mance on in-domain datasets like Common Objects in Context(COCO)after only few-shot fine-tuning.However,their generalization capabili⁃ties in cross-domain scenarios remain substantially inferior to their in-domain few-shot performance.Prior work on fine-tuning Grounding DINO for cross-domain few-shot object detection has primarily focused on data augmentation,leaving broader systemic optimizations unex⁃plored.To bridge this gap,we propose a comprehensive end-to-end fine-tuning framework specifically designed to optimize Grounding DINO for cross-domain few-shot scenarios.In addition,we propose Mixture-of-Experts(MoE)-Grounding DINO,a novel architecture that integrates the MoE architecture to enhance adaptability in cross-domain settings.Our approach demonstrates a significant 15.4 Mean Average Precision(mAP)improvement over the Grounding DINO baseline on the Roboflow20-VL benchmark,establishing a new state of the art for crossdomain few-shot object detection(CD-FSOD).The source code and models will be made available upon publication. 展开更多
关键词 cross-domain few-shot object detection Grounding DINO Mixture-of-Experts open-set object detection pseudo-labeling
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Influence of grounding giant iceberg D15 on sea ice and polynyas in a sea ice-ice shelf-ocean numerical model of the Prydz Bay,Antarctica 认领 引用
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作者 Quanyi Zhou Jiuxin Shi +5 位作者 Chuning Wang Longjiang Mu Zhigang Yao Zhaoru Zhang Yuxin Han Yongming Sun 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2025年第3期147-160,共14页
A three-dimensional coupled sea ice-ice shelf-ocean numerical model is developed for the Prydz Bay,Antarctica,using the Regional Ocean Modeling System with a grid resolution of approximately 2 km.The influence of the ... A three-dimensional coupled sea ice-ice shelf-ocean numerical model is developed for the Prydz Bay,Antarctica,using the Regional Ocean Modeling System with a grid resolution of approximately 2 km.The influence of the grounding giant iceberg D15 on the distribution of sea ice and polynyas in the Prydz Bay is analyzed through two numerical experiments.Iceberg D15,grounded off the western edge of the West Ice Shelf(WIS),obstructs the southwestward transport of sea ice along the east coast of Prydz Bay,causing sea ice to accumulate to the east of the iceberg and form multi-year fast ice.Grounding of Iceberg D15 also decreases sea ice coverage off its south edge and creates ice-free openings in spring near Davis Station and Zhongshan Station,facilitating the accessibility of vessels to the research stations.These simulated sea ice patterns closely match current satellite observations.When Iceberg D15 is removed,the previously blocked sea ice north of the iceberg,which moved westward,shifts southwesterly along the coastline,leading to a reduction in sea ice thickness during winter and spring,as well as lower sea ice concentrations in spring across large areas north and west of the iceberg.In contrast,the sea ice thickness increases considerably southwest of the WIS,extending to the front of the Amery Ice Shelf during seasons covered by sea ice.The increase in sea ice concentration can also extend to as far as 75°E in spring.Without Iceberg D15,which previously contributed to the ice barrier of Barrier Polynya(BP),the shape of BP changes,the area of BP and Davis Polynya(DP)decreases,and the polynya off the northwest edge of the WIS near 83°E expands.These polynya patterns are much similar to the satellite remote sensing observations before Iceberg D15 was grounded.From April to October,the total area of BP and DP decreases by 2.83×104km2(60%)and 2.20×103km2(20%),respectively,while the total sea ice production decreases by 4.11×1010m3(66%)and 1.52×1010m3(52%)compared to the experiment with iceberg.These results indicate the substantial effects of grounding giant icebergs on the spatio-temporal distribution of sea ice,the area of polynyas,and sea ice production.High-resolution Antarctic coastal numerical models,typically with grid scales of kilometers,are sufficient to represent large icebergs,and adding the grounding giant icebergs is crucial for producing realistic simulations of sea ice and polynyas. 展开更多
关键词 grounding iceberg sea ice polynya numerical simulation Prydz Bay Antarctica
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Single-Phase Grounding Fault Identification in Distribution Networks with Distributed Generation Considering Class Imbalance across Different Network Topologies 认领 引用
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作者 Lei Han Wanyu Ye +4 位作者 Chunfang Liu Shihua Huang Chun Chen Luxin Zhan Siyuan Liang 《Energy Engineering》 EI 2025年第12期4947-4969,共23页
In contemporary medium-voltage distribution networks heavily penetrated by distributed energy resources(DERs),the harmonic components injected by power-electronic interfacing converters,together with the inherently in... In contemporary medium-voltage distribution networks heavily penetrated by distributed energy resources(DERs),the harmonic components injected by power-electronic interfacing converters,together with the inherently intermittent output of renewable generation,distort the zero-sequence current and continuously reshape its frequency spectrum.As a result,single-line-to-ground(SLG)faults exhibit a pronounced,strongly non-stationary behaviour that varies with operating point,load mix and DER dispatch.Under such circumstances the performance of traditional rule-based algorithms—or methods that rely solely on steady-state frequency-domain indicators—degrades sharply,and they no longer satisfy the accuracy and universality required by practical protection systems.To overcome these shortcomings,the present study develops an SLG-fault identification scheme that transforms the zero-sequence currentwaveforminto two-dimensional image representations and processes themwith a convolutional neural network(CNN).First,the causes of sample-distribution imbalance are analysed in detail by considering different neutralgrounding configurations,fault-inception mechanisms and the statistical probability of fault occurrence on each phase.Building on these insights,a discriminator network incorporating a Convolutional Block Attention Module(CBAM)is designed to autonomously extract multi-layer spatial-spectral features,while Gradient-weighted Class Activation Mapping(Grad-CAM)is employed to visualise the contribution of every salient image region,thereby enhancing interpretability.A comprehensive simulation platform is subsequently established for a DER-rich distribution system encompassing several representative topologies,feeder lengths and DER penetration levels.Large numbers of realistic SLG-fault scenarios are generated—including noise and measurement uncertainty—and are used to train,validate and test the proposed model.Extensive simulation campaigns,corroborated by field measurements from an actual utility network,demonstrate that the proposed approach attains an SLG-fault identification accuracy approaching 100 percent and maintains robust performance under severe noise conditions,confirming its suitability for real-world engineering applications. 展开更多
关键词 Distribution network single-phase grounding fault distribution generation class imbalance sample CNN
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基于Grounding DINO改进模型的轨道交通客流检测和人员查找方法 认领 引用
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作者 王晓 董强 +1 位作者 李雪 张丽 《铁路计算机应用》 2025年第11期61-68,共8页
针对传统目标检测模型因单模态检测与固定类别限制,难以满足轨道交通场景的动态需求问题,提出一种基于Grounding DINO改进模型的轨道交通客流检测及人员查找方法。文章提出轻量化网络架构重构、场景特异性适配训练及多尺度特征自适应融... 针对传统目标检测模型因单模态检测与固定类别限制,难以满足轨道交通场景的动态需求问题,提出一种基于Grounding DINO改进模型的轨道交通客流检测及人员查找方法。文章提出轻量化网络架构重构、场景特异性适配训练及多尺度特征自适应融合等策略,通过网络结构裁剪与量化压缩计算复杂度,基于轨道交通专用数据集与对抗训练实现场景适配,利用动态权重机制增强多尺度目标检测能力。实验结果表明,改进后的Grounding DINO模型在客流检测任务中,精确率从95.327%提升至99.785%,召回率由45.452%跃升至96.711%;人员查找检测中,精确率与召回率分别提高17.91%和89.729%。该研究为轨道交通智能化管理提供高效技术方案,其多模态融合与场景优化策略亦为跨领域目标检测研究提供新思路。 展开更多
关键词 轨道交通 客流检测 人员查找 Grounding DINO改进模型 精确率 召回率
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Path Individuation and Retrospective Grounding 认领 引用
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作者 ZHENG Yujian 《自然辩证法通讯》 CSSCI 北大核心 2025年第12期37-51,共15页
This paper purports to expound a special(technical)notion of paths.A neglected fundamental fact(especially under indeterminism)is that the path-dependent direction of any diachronic outcome is backward,i.e.,later step... This paper purports to expound a special(technical)notion of paths.A neglected fundamental fact(especially under indeterminism)is that the path-dependent direction of any diachronic outcome is backward,i.e.,later steps depend on earlier ones successively,despite the ineradicable chance in their respective formation.In this paper,a token-oriented retrospective approach is proposed to overcome the limitation of the type-oriented approach in explaining path-related phenomena.My argument for the validity and utility of this approach is largely based on the elements of(PD),a definitional schema for diachronic sequences subject to a recursive counterfactual formula.I explore certain aspects of path individuation that have so far not been discussed,despite(PD)’s formal congeniality with Lewis’s‘causal chain’.Two basic patterns of path generation are examined:the first is for distinguishing actual vs possible branching paths,while the second introduces a metaphysical theme regarding the retrospective grounding of the causal status of an upstream event by its downstream(joint)effect.A central example of the paper,viz.,the Gobang game,is used to illustrate how the token-oriented approach works for path individuation. 展开更多
关键词 Path individuation Retrospective grounding Token-oriented approach Path dependence Diachronic difference making
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Single-phase-to-ground fault protection based on zero-sequence current ratio coefficient for low-resistance grounding distribution network 认领 引用 被引量：7
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作者 Jianrui Li Yongli Li +1 位作者 Yonghuan Wang Jinzhao Song 《Global Energy Interconnection》 EI CSCD 2021年第6期564-575,共12页
Definite-time zero-sequence over-current protection is presently used in systems whose neutral point is grounded by a low resistance(low-resistance grounding systems).These systems frequently malfunction owing to thei... Definite-time zero-sequence over-current protection is presently used in systems whose neutral point is grounded by a low resistance(low-resistance grounding systems).These systems frequently malfunction owing to their high settings of the action value when a high-impedance grounding fault occurs.In this study,the relationship between the zero-sequence currents of each feeder and the neutral branch was analyzed.Then,a grounding protection method was proposed on the basis of the zero-sequence current ratio coefficient.It is defined as the ratio of the zero-sequence current of the feeder to that of the neutral branch.Nonetheless,both zero-sequence voltage and zero-sequence current are affected by the transition resistance,The influence of transition resistance can be eliminated by calculating this coefficient.Therefore,a method based on the zero-sequence current ratio coefficient was proposed considering the significant difference between the faulty feeder and healthy feeder.Furthermore,unbalanced current can be prevented by setting the starting current.PSCAD simulation results reveal that the proposed method shows high reliability and sensitivity when a high-resistance grounding fault occurs. 展开更多
关键词 Low-resistance grounding system High-impedance grounding fault Grounding protection Zero-sequence current ratio coefficient
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Protection of Zero-Sequence Power Variation in Mountain Wind Farm Collector Lines Based on Multi-Mode Grounding 认领 引用
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作者 Hongchun Shu Yaqi Deng +3 位作者 Pulin Cao Jun Dong Hongjiang Rao Zhiqian Bo 《Energy Engineering》 EI 2022年第2期523-538,共16页
The arc-suppression coil(ASC)in parallel low resistance(LR)multi-mode grounding is adopted in the mountain wind farm to cope with the phenomenon that is misoperation or refusal of zero-sequence protection in LR ground... The arc-suppression coil(ASC)in parallel low resistance(LR)multi-mode grounding is adopted in the mountain wind farm to cope with the phenomenon that is misoperation or refusal of zero-sequence protection in LR grounding wind farm.If the fault disappears before LR is put into the system,it is judged as an instantaneous fault;while the fault does not disappear after LR is put into the system,it is judged as a permanent fault;the single-phase grounding fault(SLG)protection criterion based on zerosequence power variation is proposed to identify the instantaneous-permanent fault.Firstly,the distribution characteristic of zero-sequence voltage(ZSV)and zero-sequence current(ZSC)are analyzed after SLGfault occurs in multi-mode grounding.Then,according to the characteristics that zero-sequence power variation of non-fault collector line is small,while the zero-sequence power variation of fault collector line can reflect the active power component of fault resistance,the protection criterion based on zero-sequence power variation is constructed.The theoretical analysis and simulation results show that the protection criterion can distinguish the property of fault only by using the single terminal information,which has high reliability. 展开更多
关键词 Mountain wind farm multi-mode grounding collector line single-phase grounding fault zero-sequence power variation
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Residual current compensation for single-phase grounding fault in coal mine power network 认领 引用 被引量：5
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作者 Jia Chenxi Wang Chonglin Du Guifu 《International Journal of Mining Science and Technology》 EI CAS 2014年第2期213-218,共6页
The way of neutral point to earth via full compensation arc suppression coil can solve the problem of residual current compensation in coal mine power network effectively. Based on the analysis on the grounding curren... The way of neutral point to earth via full compensation arc suppression coil can solve the problem of residual current compensation in coal mine power network effectively. Based on the analysis on the grounding current detection results of Xieqiao coal mine, the conclusion that harmonic component of grounding current is dominated by higher harmonics with complex harmonic sources in coal mine power network system was obtained. The influences of harmonic source type and fault point position on harmonic voltage and harmonic current were analyzed theoretically. The influences of earthed fault feeder detection result and the estimation errors of parameters to earth on residual current compensation were analyzed. A new thought of residual current prediction and the selections of model method and control method were proposed on this basis. The simulation results prove that harmonic amplitudes of zero sequence voltage and zero sequence current are determined by harmonic source type as well as fault point position in coal mine power network, and also prove that zero sequence voltage detection can avoid the unstable problem of coal mine power network system caused by undercompensation of capacitive current. Finally, the experimental device of full compensation arc suppression coil is introduced. 展开更多
关键词 Full compensation arc suppression co Residual current compensation Grounding current detection Zero sequence voltage detection
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Dynamic physical characteristics of DC arc on arcing horn for HVDC grounding electrode line 认领 引用
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作者 刘益岑 杨晨光 +4 位作者 郭裕钧 张血琴 肖嵩 高国强 吴广宁 《Plasma Science and Technology》 SCIE EI CAS CSCD 2023年第1期80-87,共8页
The dynamic physical characteristics of a DC arc on an arcing horn for a high voltage direct current(HVDC)grounding electrode line are significantly different from those of the switching device arc,secondary arc,AC fa... The dynamic physical characteristics of a DC arc on an arcing horn for a high voltage direct current(HVDC)grounding electrode line are significantly different from those of the switching device arc,secondary arc,AC fault arc and pantograph-catenary arc.In this work,an experimental platform for the DC arc on the arcing horn was built,and mechanisms of the arc column short circuit and arc root movement were studied.This work further analyzes the characteristics and mechanisms of the arc motion when wind speed and direction,magnetic field and the expansion angle of the electrode are varied.Arc root movement is more likely to occur at the upper electrode.There is a competitive relationship between arc expansion and the transferring effect.The effect of wind on the arc column is greater than the effect on the arc root.The magnetic field has a significant driving effect on both the arc column and the arc root.The research results provide a comprehensive experimental basis for forther probing the method of DC arc suppression,and the improvement of the arcing horn. 展开更多
关键词 grounding electrode line arcing horn DC arc dynamic physical characteristics
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Rapid Prediction of Structural Responses of Double-Bottom Structures in Shoal Grounding Scenario 认领 引用
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作者 Zhiqiang Hu Ge Wang +1 位作者 Qi Yao Zhaolong Yu 《Journal of Marine Science and Application》 CSCD 2016年第1期73-85,共13页
This study presents a simplified analytical model for predicting the structural responses of double-bottom ships in a shoal grounding scenario. This solution is based on a series of analytical models developed from el... This study presents a simplified analytical model for predicting the structural responses of double-bottom ships in a shoal grounding scenario. This solution is based on a series of analytical models developed from elastic-plastic mechanism theories for different structural components, including bottom girders, floors, bottom plating, and attached stiffeners. We verify this simplified analytical model by numerical simulation, and establish finite element models for a typical tanker hold and a rigid indenter representing seabed obstacles. Employing the LS-DYNA finite element solver, we conduct numerical simulations for shoal-grounding cases with a wide range of slope angles and indentation depths. In comparison with numerical simulations, we verify the proposed simplified analytical model with respect to the total energy dissipation and the horizontal grounding resistance. We also investigate the interaction effect of deformation patterns between bottom structure components. Our results show that the total energy dissipation and resistances predicted by the analytical model agree well with those from numerical simulations. 展开更多
关键词 shoal grounding simplified analytical method numerical simulation structural response energy dissipation resistance
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Grounding Impedance Measurement of High Speed Railway Integrated Grounding System 认领 引用
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作者 Zhang Yi Jianguo Wang +2 位作者 Yadong Fan Mi Zhou Li Cai 《Journal of Power and Energy Engineering》 2015年第4期194-199,共6页
The high-speed railway integrated grounding system is the basic guarantee for the safe and stable operation of the railway. It is the world’s largest long-distance horizontally elongated joint grounding system, which... The high-speed railway integrated grounding system is the basic guarantee for the safe and stable operation of the railway. It is the world’s largest long-distance horizontally elongated joint grounding system, which stretches the length of hundreds to thousands of kilometers, and its structure is not only different from power station and substation grounding system, but also different from the transmission line tower, lightning rod and other small grounding devices. There is little research information on the grounding impedance of high-speed railway integrated grounding system. This paper adopted 0.618 compensation method and reverse away method respectively, measured a section of high-speed railway integrated grounding system grounding impedance by JD16 and CA6425. Measurement results are in good agreement using those two type instrument. By using 0.618 compensation method, the measurement result will be gradually converged at 0.3 Ω with the increasing of current electrode distance, which is the real grounding impedance of integrated grounding system. By using reverse away method, the maximum measurement result difference is less than 0.024 Ω with the lead of current electrode distance increasing. The measurement results will be rapidly converged 0.25 Ω. The results showed that the reverse away method is helpful to shorten the length of current electrode wiring. The measurement error will be small when the current electrode wiring is longer. 展开更多
关键词 High-Speed Railway Integrated Grounding System Grounding Impedance
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Corrosion behavior of low-carbon Cr micro-alloyed steel for grounding grids in simulated acidic soil 认领 引用 被引量：4
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作者 Jian Li Hang Su +4 位作者 Feng Chai Dong-mei Xue Li Li Xiang-yang Li Hui-min Meng 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2018年第7期755-766,共12页
To improve the corrosion resistance of steels for grounding grids, a low-carbon Cr micro-alloyed steel was developed （C 1 steel）, and corrosion behavior of Q235 steel and newly developed C1 steel in simulated acidic... To improve the corrosion resistance of steels for grounding grids, a low-carbon Cr micro-alloyed steel was developed （C 1 steel）, and corrosion behavior of Q235 steel and newly developed C1 steel in simulated acidic soil was investigated. The corrosion rate was evaluated with the mass loss measurements, while the corrosion morphology of surface and cross section of rust layer was observed by scanning electron microscopy. The corrosion products were analyzed by energy- dispersive X-ray spectrometry, X-ray diffraction and X-ray photoelectron spectroscopy, and the polarization curve was measured using potentiodynamic polarization method. Results indicated that C 1 steel displayed good corrosion resistance in the simulated acidic soil, of which the corrosion rate was only 30% of that of Q235 steel after corrosion for 360 h. The analysis of rust layer showed that lower carbon content in steel could reduce the tendency of micro cell corrosion and appropriate amount of chromium could improve the corrosion potential of metal matrix. Moreover, the analysis of X-ray photoelectron spectroscopy revealed that the chromium enriched in inner rust layer of C1 steel existed mainly in the form of Fe2CrO4, which facilitated the formation of Cr-goethite and improved the protection of corrosion products. 展开更多
关键词 Soil corrosion Grounding grid Low-carbon steel Cr micro-alloying Corrosion product - Cr-goethite
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Small-current grounding fault location method based on transient main resonance frequency analysis 认领 引用 被引量：4
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作者 Yongjie Zhang Xiaojun Wang +2 位作者 Junjuan Li Yin Xu Guohong Wu 《Global Energy Interconnection》 EI 2020年第4期324-334,共11页
The small-current grounding fault in distribution network is hard to be located because of its weak fault features.To accurately locate the faults,the transient process is analyzed in this paper.Through the study we t... The small-current grounding fault in distribution network is hard to be located because of its weak fault features.To accurately locate the faults,the transient process is analyzed in this paper.Through the study we take that the main resonant frequency and its corresponding component is related to the fault distance.Based on this,a fault location method based on double-end wavelet energy ratio at the scale corresponding to the main resonant frequency is proposed.And back propagation neural network(BPNN)is selected to fit the non-linear relationship between the wavelet energy ratio and fault distance.The performance of this proposed method has been verified in different scenarios of a simulation model in PSCAD/EMTDC. 展开更多
关键词 Small-current grounding fault location Main resonant frequency Double-end wavelet energy ratio Backpropagation neural network(BPNN)
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An Improved Algorithm of Grounding Grids Corrosion Diagnosis Based on Total Least Square Method 认领 引用 被引量：3
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作者 ZHANG Ying-jiao NIU Tao WANG Sen 《高压电器》 CAS CSCD 北大核心 2011年第5期22-29,共8页
A new model considering corrosion property for grounding grids diagnosis is proposed,which provides reference solutions of ambiguous branches.The constraint total least square method based on singular value decomposit... A new model considering corrosion property for grounding grids diagnosis is proposed,which provides reference solutions of ambiguous branches.The constraint total least square method based on singular value decomposition is adopted to improve the effectiveness of grounding grids' diagnosis algorithm.The improvement can weaken the influence of the model's error,which results from the differences between design paper and actual grid.Its influence on touch and step voltages caused by the interior resistance of conductors is taken into account.Simulation results show the validity of this approach. 展开更多
关键词 corrosion property grounding grids corrosion diagnosis ambiguous total least square touch and step voltages
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Research on Magnetically Coupled Resonant Detection Method for Breakpoint of Four Mesh Grounding Grid 认领 引用 被引量：3
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作者 Weihua Chen Shuai Wang +1 位作者 Xiaoheng Yan Zhiquan Ye 《CES Transactions on Electrical Machines and Systems》 CSCD 2023年第2期218-228,共11页
Magnetically coupled resonant technology is a novel method for solving the breakpoint locating of power grounding grid.But the method can only detect breakpoints of a single mesh grounding grid at present.In this pape... Magnetically coupled resonant technology is a novel method for solving the breakpoint locating of power grounding grid.But the method can only detect breakpoints of a single mesh grounding grid at present.In this paper,a magnetically coupled resonant detection method for four-hole grounding grid breakpoint is proposed.Firstly,the equivalent circuit model of the four mesh grounding grid with two types of breakpoints,namely edge branch and intermediate branch,is established.The input impedance and phase angle of the system are obtained by analyzing the equivalent capacitance and equivalent resistance in the model.Secondly,the magnetically coupled resonant physical process of grounding grid faults is solved via HFSS software.The magnetic field intensity and phase frequency characteristic curves of four mesh holes with different branches and positions of breakpoints and different corrosion degrees are studied,and an experimental system is built to verify the feasibility.The results show that under the condition of grounding grid buried depth of 0.5 m and input frequency of 1~15MHz,and there is an inverse relationship between equivalent capacitance and distortion frequency,the phase angle is positively correlated with the degree of corrosion of grounding grid,and the error of signal distortion frequency can be positioned at 5%.This paper provides some ideas for the application of magnetic coupling grounding grid detection technology. 展开更多
关键词 Grounding grid Magnetically coupled resonant detection Input impedance Phase frequency characteristic curve
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Computer Analysis of Electromagnetic Transients in Grounding Systems Considering Variation of Soil Parameters with Frequency 认领 引用
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作者 Marco A.O.Schroeder Marcio M.Afonso +1 位作者 Tarcisio A.S.Oliveira Sandro C.Assis 《Journal of Electromagnetic Analysis and Applications》 2012年第12期475-480,共6页
This paper presents a mathematical model to calculate transients in grounding systems. The derived equations arise from direct application of basic electromagnetic equations in frequency domain, whose solution is obta... This paper presents a mathematical model to calculate transients in grounding systems. The derived equations arise from direct application of basic electromagnetic equations in frequency domain, whose solution is obtained by the application of the Moment Methods. A formulation based on experimental measurements is applied to quantify the soil parameters for each frequency. The unified approach is applied in the calculation of the grounding impedance of horizontal electrodes. Results show that the inclusion of frequency dependence of the soil parameters leads to a reduction of the values of grounding impedance, in comparison with results for soils with parameters independent of frequency. 展开更多
关键词 Grounding Electrodes Grounding Impedance Transient Response Frequency Response Electromagnetic Modeling
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Numerical simulation of the dynamic effects of grounding icebergs on summer circulation in Prydz Bay,Antarctica 认领 引用 被引量：2
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作者 HAN Yuxin SHI Jiuxin +1 位作者 HOU Saisai XIAO Changhao 《Advances in Polar Science》 CSCD 2022年第2期135-144,共10页
The Regional Ocean Modeling System(ROMS)is employed to create a three-dimensional numerical model of the summer circulation in the Prydz Bay region,Antarctica.Consistent with the currents measured using an underway ac... The Regional Ocean Modeling System(ROMS)is employed to create a three-dimensional numerical model of the summer circulation in the Prydz Bay region,Antarctica.Consistent with the currents measured using an underway acoustic Doppler current profiler during a Chinese cruise,the simulated current field illustrates the major features of the Prydz Bay circulation,including the Antarctic Slope Current(ASC)along the continental shelf break,the cyclonic Prydz Bay Gyre,and the Prydz Bay Eastern Coastal Current(PBECC).The effects of grounding icebergs D15 and B15 on the circulation in Prydz Bay are investigated via numerical simulations.The results indicate that these giant grounding icebergs substantially affect the flows into and within the bay,which may differ with the different grounding locations.As grounding iceberg D15 is located close to the southwestern part of the West Ice Shelf(WIS),it cuts off the coastal current along the outer edge of the WIS,and the ASC can only enter Prydz Bay from the west side of iceberg D15,whereupon it becomes a main source of the PBECC.Iceberg D15 also weakens the circulation in the bay in general.The relatively small iceberg B15 entered Prydz Bay from 2007 to 2009 and grounded on the southwestern section of the Four Ladies Bank.The numerical experiments indicate that iceberg B15 guides the ASC flowing into the bay around its west side and reduces the width of the inflow on the eastern side of the Prydz Bay Channel.The grounding of iceberg B15 has also led to adjustments of the circulation within the bay,among which the most significant is that the outflow along the western flank of Fram Bank has shifted to the west and become more intensive. 展开更多
关键词 circulation grounding iceberg numerical simulation Prydz Bay Antarctica
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Structural Reliability Analysis of Ship Hulls Accounting for Collision or Grounding Damage 认领 引用 被引量：2
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作者 Branka BužančićPrimorac Joško Parunov C.Guedes Soares 《Journal of Marine Science and Application》 CSCD 2020年第4期717-733,共17页
Classical structural reliability analysis of intact ship hulls is extended to the case of ships with collision or grounding damages.Still water load distribution and residual bending moment capacity are included as ra... Classical structural reliability analysis of intact ship hulls is extended to the case of ships with collision or grounding damages.Still water load distribution and residual bending moment capacity are included as random variables in the limit state equation.The probability density functions of these random variables are defined based on random damage parameters given by the Marine Environment Protection Committee of the International Maritime Organization,while the proposed reliability formulation is consistent with international recommendations and thus may be valuable in the development of rules for accidental limit states.The methodology is applied on an example of an Aframax oil tanker.The proposed approach captures in a rational way complex interaction of different pertinent variables influencing safety of damaged ship structure. 展开更多
关键词 Ship structures Hull girder Collision and grounding Damaged oil tanker Residual strength Uncertainty modelling Structural reliability
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