IET Electrical Systems in Transportation最新文献_第2页

IF 2.2 4区工程技术

IET Electrical Systems in Transportation Pub Date : 2025-12-22

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Study on the Computational Model for Frequency-Dependent Impedance of Rails Incorporating the Effects of Cross-Sectional Geometry 考虑截面几何影响的钢轨频率阻抗计算模型研究

IF 2.2 4区工程技术

IET Electrical Systems in Transportation Pub Date : 2025-12-18 DOI: 10.1049/els2/7425866

Shaotong Chu, Shiwu Yang

{"title":"Study on the Computational Model for Frequency-Dependent Impedance of Rails Incorporating the Effects of Cross-Sectional Geometry","authors":"Shaotong Chu, Shiwu Yang","doi":"10.1049/els2/7425866","DOIUrl":"10.1049/els2/7425866","url":null,"abstract":"In addressing the issue of electromagnetic interference in railway environments, research into the coupling pathways, amplitude distribution patterns, and attenuation characteristics of such interference is crucial for identifying practical solutions. Rails, a common channel for signaling and traction power supply systems, play a pivotal role in anti-interference design. However, due to their ferromagnetic material properties and irregular H-shaped cross-section, accurately defining their frequency-dependent impedance has been challenging, leading to inaccuracies in the electrical modeling of railway stations. This paper proposes a segmented modeling approach for rails, analyzing and deriving the internal impedance calculation formulas based on the distinct shapes of each rail segment. Taking the working mode of track circuits as an example, the influence of external circuit loop impedance is considered, culminating in the development of a computational model for the frequency-dependent impedance of rails. Using the 60 kg/m rail as an example, the model’s impedance calculation accuracy at specific frequency points deviates by less than 6% from standard errors. Additionally, leveraging the ANSYS platform, the finite element simulation method was employed to simulate the frequency-dependent internal impedance of rails below 100 kHz. The results showed a high degree of agreement with the internal impedance parameters derived from the model, thereby validating the model’s accuracy within the frequency range below 100 kHz under long rail conditions. This model enhances the precision of station modeling, particularly in improving the accuracy of interference amplitude distribution and attenuation characteristic calculations.","PeriodicalId":48518,"journal":{"name":"IET Electrical Systems in Transportation","volume":"2025 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/els2/7425866","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145824822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IF 2.2 4区工程技术

IET Electrical Systems in Transportation Pub Date : 2025-12-18

引用次数: 0

High-temperature resistant zwitterionic polymer viscosifier for saturated CaCl2 brine drill-in fluids 饱和CaCl2盐水钻井液用耐高温两性离子聚合物增粘剂

4区工程技术

IET Electrical Systems in Transportation Pub Date : 2025-12-01 DOI: 10.1049/icp.2025.4247

Jian Wang, Jinsheng Sun, Shuixiang Xie, Xianbin Huang, Kaihe Lv

{"title":"High-temperature resistant zwitterionic polymer viscosifier for saturated CaCl2 brine drill-in fluids","authors":"Jian Wang, Jinsheng Sun, Shuixiang Xie, Xianbin Huang, Kaihe Lv","doi":"10.1049/icp.2025.4247","DOIUrl":"https://doi.org/10.1049/icp.2025.4247","url":null,"abstract":"Solid-free brine drill-in fluids are widely used in oil and gas reservoir protection operations because they use soluble salts as weighting agents and contain no insoluble solids. To address the issues of insufficient thermal stability at elevated temperatures and poor solubility of conventional viscosifiers in CaCl2brine drill-in fluids, a zwitterionic polymer viscosifier named MPOD was synthesized using N, N-Dimethylacrylamide, 2-acrylamide-2-methylpropanesulfonic acid, Dimethyl Diallyl Ammonium Chloride, and (Methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide as raw materials. MPOD dissolves well in CaCl2brines, and its viscosifying effect improves with increasing brine density. In 1.4 g/cm3CaCl2brine, the apparent viscosity of a 1.0 wt% MPOD solution is 50.5 mPa·s and the yield point is 8.5 Pa. After ageing at 150 °C, viscosity remained stable, confirming good thermal resistance. Furthermore, when combined with other treatment agents, MPOD exhibits good compatibility. The system maintains excellent rheological properties after ageing, and MPOD reduces the HTHP (high-temperature, high-pressure) fluid loss of the CaCl2brine system to less than 15 mL. MPOD exhibits excellent high-temperature resistance, enabling efficient cuttings transport and wellbore cleaning.","PeriodicalId":48518,"journal":{"name":"IET Electrical Systems in Transportation","volume":"2025 33","pages":"42-47"},"PeriodicalIF":0.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147905426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Synthesis and performance evaluation of a novel organic-inorganic wellbore enhancing agent for wellbore stability in water-based drilling fluids 新型水基钻井液井眼稳定性有机-无机增强剂的合成与性能评价

4区工程技术

IET Electrical Systems in Transportation Pub Date : 2025-12-01 DOI: 10.1049/icp.2025.4249

Juan He, Kaihe Lv, Xianbin Huang, Jinsheng Sun

{"title":"Synthesis and performance evaluation of a novel organic-inorganic wellbore enhancing agent for wellbore stability in water-based drilling fluids","authors":"Juan He, Kaihe Lv, Xianbin Huang, Jinsheng Sun","doi":"10.1049/icp.2025.4249","DOIUrl":"https://doi.org/10.1049/icp.2025.4249","url":null,"abstract":"Wellbore instability remains a major technical challenge when drilling complex formations with water-based drilling fluids. To address this problem, a novel wellbore enhancing agent is prepared by coating modified silica with a styrene-methyl methacrylate-acrylamide copolymer (SSMA). The microstructure and chemical composition of SSMA are characterized using SEM, EDS mapping, and FTIR, while its thermal stability is evaluated by TG analysis. Compatibility experiments demonstrate that adding 4% SSMA to the base slurry causes no significant changes in rheological properties and fluid loss, confirming its good compatibility in water-based drilling fluids. Simulated cores are prepared by mixing 40-80 mesh shale particles with the base slurry and the slurry containing SSMA, respectively. Their uniaxial compressive strength values are 0.23 MPa and 1.54 MPa, indicating that SSMA significantly improves the mechanical strength of core columns. Under wet conditions, the compressive strength of SSMA-treated cores reaches 0.56 MPa, which exceeds that of cores treated with stabilizing agents reported in the literature (0.4 MPa). In addition, SSMA can be synthesized from inexpensive and readily available raw materials, further highlighting its practical advantages. Results of mud cake immersion experiments show that the linear expansion rates of mud cakes after 16 h of immersion in water and in the 4% SSMA system are 61.0% and 45.2%, respectively. This demonstrates that SSMA adsorbs on the surface of mud cakes, effectively preventing water intrusion and inhibiting clay hydration and swelling. In summary, SSMA maintains wellbore stability through the synergistic effects of cementing rock particles to enhance mechanical strength and adsorbing on montmorillonite surfaces to block water and suppress clay swelling, thereby providing important technical support for safe and efficient drilling in complex formations.","PeriodicalId":48518,"journal":{"name":"IET Electrical Systems in Transportation","volume":"2025 33","pages":"55-59"},"PeriodicalIF":0.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147881719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of the structure-performance relationship of zwitterionic water-soluble polymers for temperature and salt resistance in drilling fluids 两性离子水溶性聚合物在钻井液中的耐温、耐盐结构性能关系研究

4区工程技术

IET Electrical Systems in Transportation Pub Date : 2025-12-01 DOI: 10.1049/icp.2025.4245

Yuanwei Sun, Jinsheng Sun, Kaihe Lv, Jingping Liu

{"title":"Investigation of the structure-performance relationship of zwitterionic water-soluble polymers for temperature and salt resistance in drilling fluids","authors":"Yuanwei Sun, Jinsheng Sun, Kaihe Lv, Jingping Liu","doi":"10.1049/icp.2025.4245","DOIUrl":"https://doi.org/10.1049/icp.2025.4245","url":null,"abstract":"At present, the structure–performance relationship of temperature and salt resistance in water-soluble polymers for high-temperature and high-salinity drilling fluids remains unclear, and research in this area is largely empirical. In this study, representative functional monomers were selected, and a series of water-soluble zwitterionic polymers with similar molecular weights for drilling fluids were synthesized by introducing different functional monomers and controlling polymerization conditions. By correlating polymer structure and thermal decomposition temperature with their performance in high-temperature and high-salinity drilling fluids, the enhancement effects of functional monomers on polymer properties were compared. To address the limitation that thermogravimetric analysis cannot accurately reflect polymer performance, an evaluation method combining hydrothermal treatment with FTIR analysis was proposed. It is pointed out that enhancing the three main structures of hydration, adsorption, and structural integrity is the key to improving the effectiveness of polymer action, providing new ideas for the research of high-performance polymers for drilling fluids.","PeriodicalId":48518,"journal":{"name":"IET Electrical Systems in Transportation","volume":"2025 33","pages":"28-35"},"PeriodicalIF":0.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147900882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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IF 2.2 4区工程技术

IET Electrical Systems in Transportation Pub Date : 2025-11-25

引用次数: 0

Availability Evaluation of Overhead Contact Lines Based on a Stochastic Colored Petri Nets Model 基于随机有色Petri网模型的架空接触线路可用性评价

IF 2.2 4区工程技术

IET Electrical Systems in Transportation Pub Date : 2025-11-25 DOI: 10.1049/els2/9947431

Jingheng Zhou, Shibin Gao, Long Yu, Bohan Li

{"title":"Availability Evaluation of Overhead Contact Lines Based on a Stochastic Colored Petri Nets Model","authors":"Jingheng Zhou, Shibin Gao, Long Yu, Bohan Li","doi":"10.1049/els2/9947431","DOIUrl":"10.1049/els2/9947431","url":null,"abstract":"Due to their nonbackup characteristics and constant exposure to outdoor conditions, the performance of overhead contact lines (OCLs) will gradually degrade over time and further result in equipment defects or frequent failures. These issues significantly impact system availability and incur substantial repair costs. To tackle these issues, this paper proposes a stochastic colored Petri net (SCPN) model to evaluate the availability of OCLs and estimate the maintenance costs, simultaneously simulating the degradation, failure, inspection, and maintenance processes of critical components and the overall system. Firstly, this model encompasses the nature of a multiple-stage deterioration process and various maintenance actions available for OCLs. A four-state transition diagram is developed to capture the intricate dependencies involved. Moreover, a subnet is formulated using SCPN to represent the four-state transition for critical components, which are described by nine tuples. Additionally, a system model is developed by integrating the subnets of OCL components. To improve simulation speed, an accelerated Monte Carlo simulation algorithm is devised to handle the analytical solution for the complex integration associated with performance transitions. Finally, the proposed approach is demonstrated by its application to an actual high-speed railway line, showcasing its effectiveness in addressing the degradation and maintenance challenges of OCLs.","PeriodicalId":48518,"journal":{"name":"IET Electrical Systems in Transportation","volume":"2025 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/els2/9947431","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145626005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Method for Predicting Traction Load of Electrified Railways Considering Spatiotemporal Correlation Characteristics 考虑时空相关特性的电气化铁路牵引负荷预测方法

IF 2.2 4区工程技术

IET Electrical Systems in Transportation Pub Date : 2025-11-13 DOI: 10.1049/els2/5516562

Qiang Gao, Hongbo Cheng, Shaohua Zheng, Shouxing Wan, Wuzhao Li

{"title":"A Method for Predicting Traction Load of Electrified Railways Considering Spatiotemporal Correlation Characteristics","authors":"Qiang Gao, Hongbo Cheng, Shaohua Zheng, Shouxing Wan, Wuzhao Li","doi":"10.1049/els2/5516562","DOIUrl":"10.1049/els2/5516562","url":null,"abstract":"In the prediction of traction loads for electrified railways, conventional forecasting methods often focus exclusively on temporal correlations within historical data from individual substations. However, traction loads are profoundly affected by train schedules and exhibit substantial spatial interdependence across different substations. To address this limitation, this study proposes a hybrid model integrating a graph convolutional network (GCN) and a bidirectional long short-term memory (BiLSTM) network, which comprehensively incorporates both spatial and temporal dependencies to significantly improve ultrashort-term prediction accuracy. The proposed framework operates in several stages. First, spatial correlations among regional substations are captured using a GCN. To mitigate the risk of including spurious connections—often referred to as “pseudo-adjacency” relationships—the adjacency matrix is refined using Pearson correlation coefficients, thereby strengthening the model’s representation of meaningful spatial interactions. The spatial features extracted by the GCN at consecutive time steps are then organized into a temporal sequence and input into the BiLSTM module. To further enhance temporal modeling, an attention mechanism is incorporated to adaptively weigh the importance of hidden states, enabling the model to focus on the most relevant temporal information. This integrated approach results in a notable improvement in the accuracy of traction load power forecasting. Results from case studies demonstrate that the proposed model, with appropriately configured spatiotemporal parameters, achieves superior prediction accuracy. This finding underscores the necessity of incorporating spatiotemporal characteristics for traction load forecasting.","PeriodicalId":48518,"journal":{"name":"IET Electrical Systems in Transportation","volume":"2025 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/els2/5516562","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145521756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IF 2.2 4区工程技术

IET Electrical Systems in Transportation Pub Date : 2025-11-13

引用次数: 0