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Study on static performance of the steel-concrete joint in a high-speed railway hybrid girder low tower cable-stayed bridge

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STRUCTURES 2025年 71卷

作者： Wang, Haibo Yang, Liang Zeng, Haozhe Cent South Univ Sch Civil Engn Changsha 410075 Peoples R China

The steel-concrete joint (SCJ) of mixed beam bridge plays a key role in connecting concrete box girder and steel box girder, but its complex structure makes its mechanical properties unclear. Compared with traditional mixed beam cable-stayed Bridges, mixed beam low tower cable-stayed Bridges show stronger competitiveness. However, there is still a lack of published literature on the study of SCJ of mixed beam low tower cable-stayed Bridges for high-speed railway. In order to study its mechanical properties, a scale model test with similar ratio of 1:5 was carried out under the background of Yongjiang River mega-bridge. The results show that under the action of 5.0 times maximum axial force and maximum negative bending moment, the components of the test model are still in the elastic state, the vertical deformation of the model is continuous and smooth, and the slip between steel and concrete is small, which indicates that the model has good bearing capacity and safety. At the same time, the force transfer mechanism of steel-hybrid section under axial compression is discussed by finite element analysis (FEA). The numerical results show that the rear bearing plate is the main force transfer member of the SCJ, while the front bearing plate transmits a small proportion of axial force. Improving the strength of concrete has limited effect on the transmission path, but can enhance the overall stiffness. The increase of the thickness of the rear pressure plate and the T-rib with variable section mainly affects the force transfer ratio of the rear bearing plate, but has little effect on other force transfer indexes and the overall stiffness. The increase of the stiffness of the shear connectors significantly affects the force transfer proportion and the force transfer uniformity of the bearing plate, but its increase is far more than the change of the force transfer index, and the influence on the overall stiffness of the joint section can be ignored. The results can provid

关键词： Hybrid girder short tower cable-stayed bridge Steel-concrete joint Scale-down model test Finite element analysis Force transmission mechanism structural parameter analysis

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analysis of Radial Electromagnetic Force for Permanent Magnet Generator with Motion Rectifier

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JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY 2025年第4期20卷 2289-2300页

作者： Xue, Zhiwei Liu, Xin Tiangong Univ Sch Mech Engn Tianjin 300387 Peoples R China

The permanent magnet generator with motion rectifier (MR-PMG) can harvest energy from reciprocating motion, and it has broad application prospects in field of wave energy generation. In the process of bi-directional input, radial electromagnetic force has significant impact on vibration of the generator. This paper focuses on radial electromagnetic force and electromagnetic vibration of MR-PMG. Firstly, the air gap flux density and radial electromagnetic force of the MR-PMG are calculated, and finite element method is used to analyze time-space and spectral characteristics of the radial electromagnetic force. Secondly, the natural frequencies of each vibration mode are calculated using modal superposition method and the influence of radial electromagnetic force on generator vibration is obtained by magnetic-structural coupling analysis. Finally, the influence of structural parameters on low-order radial electromagnetic force is discussed. The research results indicate that the generator does not resonance at low speed, and the twice frequency of radial electromagnetic force has the greatest impact on electromagnetic vibration. The radial electromagnetic force of MR-PMG can be reduced by increasing slot notch width, air gap length and polar arc coefficient while reducing the thickness of permanent magnet. The research results can provide theoretical basis for further research on vibration suppression and structural optimization of MR-PMG.

关键词： Motion rectifier Radial electromagnetic force Finite element method structural parameter analysis

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parameter Sensitivity Study on Static and Dynamic Mechanical Properties of the Spatial Y-shaped Tied Arch Bridge

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INTERNATIONAL JOURNAL OF STEEL STRUCTURES 2023年第2期23卷 458-479页

作者： Sun, Jianpeng Tan, Zihan Zhang, Jiaju Sun, Wenwu Zhu, Li Xian Univ Architecture & Technol Sch Civil Engn Xian 710055 Shaanxi Peoples R China Xian Univ Architecture & Technol Inst Interdisciplinary & Innovate Res Xian 710055 Shaanxi Peoples R China Xian Jianzhukeda Engn Technol Co Ltd Xian 710055 Shaanxi Peoples R China

The spatial Y-shaped tied arch bridge is a rare form of innovative bridge on arch bridges around the world. It has important reference significance for the design and construction of bridge engineering worldwide. This arch bridge is novel in design and adopts single and double arch ribs combined structure. However, as a novel bridge type, its force situation is indetermination, so it is very important to study its mechanical properties and parameter sensitivity. In order to study the mechanical properties of the spatial Y-shaped tied arch bridge and the influence of structural parameters, this paper takes a spatial Y-shaped tied arch bridge under construction in China as the research object. The finite element software MIDAS Civil is used to establish the bridge model. The finite element model is used to analyze the static and dynamic performance of the spatial Y-shaped tied arch bridge under the use stage and the mechanical change trend under the influence of different rise-span ratios and double arch bifurcation angles. The results of single arch rib and double arch rib under constant load and live load are compared under different structural parameters in this paper, and the parameter sensitivity analysis of statics and dynamics is carried out. These analyses provide the adjustment basis and design reference for the design of the special-shaped arch bridge in the future.

关键词： Special-shape arch bridge Mechanical property Static analysis Dynamic analysis structural parameter analysis parameter Sensitivity

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Fault-Tolerant System Design for Doubly Salient Electromagnetic Machine Under Loss of Excitation

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IEEE TRANSACTIONS ON POWER ELECTRONICS 2022年第4期37卷 4589-4599页

作者： Jiang, Siyuan Zhou, Bo Xuzhen, Huang Xiong, Lei Wei, Jiadan Zhou, Kaifang Nanjing Univ Aeronaut & Astronaut Coll Automat Engn Nanjing 210016 Peoples R China Ningbo Jingcheng Car Ind Co Ltd Ningbo 315105 Peoples R China

Aiming at the problem that the traditional doubly salient electromagnetic machine (DSEM) cannot work when the excitation loss occurs, this article designs and analyzes a fault-tolerant DSEM for excitation loss, and the torque ripple suppression strategy under the fault-tolerant operation is studied. First, the characteristics of the output torque of DSEM before and after excitation-loss is analyzed, and a DSEM with a novel winding configuration is proposed to improve the fault tolerance. Second, under normalx002F;excitation-loss conditions, the structure parameters of the fault-tolerant DSEM are analyzed to reveal the influence of the motor structure on its performance. Then, the steady-state torque of the fault-tolerant DSEM is compared with the traditional DSEM and the switched reluctance motor with the same size, which proves the effectiveness of the fault-tolerant design. By analyzing the inductance and torque characteristics, a torque ripple suppression strategy is proposed for the fault-tolerant DSEM without increasing the complexity of the system. Finally, a prototype is developed, and the experimental results verify the fault-tolerant capability of the prototype and the effectiveness of the proposed torque ripple suppression strategy. The research results of this article provide a specific implementation method for the fault-tolerant system design of DSEM under excitation loss.

关键词： Fault tolerant systems Fault tolerance Torque Windings Reluctance motors Torque measurement Air gaps Doubly salient electromagnetic machine excitation loss fault-tolerant control fault-tolerant operation structural parameter analysis

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Contribution to Modeling of Parasitic Couplings for Predicting EMC Behavior of Electrical Machines 21

Contribution to Modeling of Parasitic Couplings for Predicti...

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International Conference on Electrical Machines (ICEM)

作者： Ramos, J. I. Dienot, J-M. Vidal, P-E. Viguier, C. Nogarede, B. Novatem SAS Adv Mechatron FR-11111 Toulouse France Toulouse Univ Lab Genie Prod Dept Elect Engn INP ENIT FR-65000 Tarbes France

ISBN: (纸本)9781479943883

The characterization of parasitic couplings contributing to mechatronic assemblies' wide band Electromagnetic Compatibility (EMC) behavior is complex but increasingly essential for meeting needed performance and regulations. This article presents a comparative study of analytical and numerical approaches to determine the capacitive couplings in wound structures as an effort to develop a comprehensive approach to predict and prevent undesired couplings. The approach is based on physical and structural parameters analysis instead of behavioral characterization, allowing the use of predictive tools in the early design stage of mechatronic systems. The analytical model presented is compared to simulation methods applied to a three-layer inductor. Calculations converge to similar results. In the last part of the work, an experimental measurement of stray capacitance is done on an actual stator winding and compared to the analytical predictions of parasitic capacitances.

关键词： assembling capacitance measurement electric machines electromagnetic compatibility mechatronics numerical analysis stators EMC behavior capacitive coupling determination electrical machine mechatronic assembly numerical approach physical parameter analysis stator winding stray capacitance measurement structural parameter analysis three-layer inductor wideband electromagnetic compatibility behavior wound structure Analytical models Capacitance Coatings Conductors Couplings Electric fields Inductors electric machines electromagnetic compatibility Couplings Stator windings Microelectromechanical devices Capacitance measurement inductors Stators capacitance conducting bodies analysis MODELS Electric fields Numerical analysis Coatings wind structure

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analysis on structural parameters and electrical performance of dc deep well grounding electrode

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JOURNAL OF ENGINEERING-JOE 2019年第16期2019卷 2366-2370页

作者： Teng, Yun Wen, Xishan Cai, Hansheng Jia, Lei Liu, Gang Hu, Shangmao Lu, Hailiang Wuhan Univ Sch Elect Engn & Automat Wuhan Hubei Peoples R China CSG Elect Power Res Inst Guangzhou Guangdong Peoples R China

Deep well-grounding electrodes (DWGE) have advantage of smaller occupied area, and the number of sub-ground electrodes is less than that of the vertical grounding electrodes, thus has a good development prospects. Here, the simulation model of the electrical parameters of the DWGEs is established, and the electrical performance of the same length DWGE and the horizontal grounding electrodes is compared. The influence of length and the cross-sectional diameter on the electrical performance of electrodes is studied. The simulation results and analysis show that compared with the shallow buried horizontal grounding electrodes, the DWGEs have the performance of smaller ground resistance and lower maximum step voltage. By increasing the length of grounding electrodes, the ground resistance, the maximum dissipation current density, and step voltage decrease, the surface potential of the nearby area decreases. Increasing the cross-sectional diameter to improve the electrical performance of electrodes is not obvious, except for the dissipation current density. It is suggested that the length of the DWGEs in the project should not exceed 1500m and the diameter of the coke is less than 0.4m.

关键词： conductors (electric) current density earth electrodes surface potential electrical performance dc deep well grounding electrode sub-ground electrodes vertical grounding electrodes electrical parameters DWGEs cross-sectional diameter structural parameter analysis ground resistance simulation model surface potential dissipation current density shallow buried horizontal grounding electrodes

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