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Anisotropic strength,deformation and failure of gneiss granite under high stress and temperature coupled true triaxial compression

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岩石力学与岩土工程学报（英文版） 2024年第3期16卷 860-876页

作者： Hongyuan Zhou Zaobao Liu Fengjiao Liu Jianfu Shao Guoliang Li Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines College of Resources and Civil EngineeringNortheastern UniversityShenyang110819China Institute of Deep Engineering and Intelligent Technology Northeastern UniversityShenyang110819China University Lille CNRSCentrale LilleUMR 9013-LaMcube-Laboratoire de MécaniqueMultiphysiqueMulti-échelleF-59000LilleFrance Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines College of Resources and Civil EngineeringNortheastern UniversityShenyang110819China Institute of Deep Engineering and Intelligent Technology Northeastern UniversityShenyang110819China Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines College of Resources and Civil EngineeringNortheastern UniversityShenyang110819China University Lille CNRSCentrale LilleUMR 9013-LaMcube-Laboratoire de MécaniqueMultiphysiqueMulti-échelleF-59000LilleFrance State Key Lab on Rail & Transit Engineering Informatization China Railway First Survey and Design Institute Group Co.LtdXi'an710043China

The anisotropic mechanical behavior of rocks under high-stress and high-temperature coupled condi-tions is crucial for analyzing the stability of surrounding rocks in deep underground *** paper is devoted to studying the anisotropic strength,deformation and failure behavior of gneiss granite from the deep boreholes of a railway tunnel that suffers from high tectonic stress and ground temper-ature in the eastern tectonic knot in the Tibet ***-temperature true triaxial compression tests are performed on the samples using a self-developed testing device with five different loading directions and three temperature values that are representative of the geological conditions of the deep under-ground tunnels in the *** of temperature and loading direction on the strength,elastic modulus,Poisson's ratio,and failure mode are *** method for quantitative identification of anisotropic failure is also *** anisotropic mechanical behaviors of the gneiss granite are very sensitive to the changes in loading direction and temperature under true triaxial compression,and the high temperature seems to weaken the inherent anisotropy and stress-induced deformation *** strength and deformation show obvious thermal degradation at 200℃ due to the weakening of friction between failure surfaces and the transition of the failure pattern in rock *** the range of 25 ℃-200 ℃,the failure is mainly governed by the loading direction due to the inherent *** study is helpful to the in-depth understanding of the thermal-mechanical behavior of anisotropic rocks in deep underground projects.

关键词： Anisotropic strength and deformation True triaxial compression Thermal mechanical coupling Deep rock mechanics High temperature rock mechanics

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Modeling and Validation of Typical Scenarios of High-Speed railway Automatic Train Operation Based on Alvis

Modeling and Validation of Typical Scenarios of High-Speed R...

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2022 International Conference on Frontiers of Traffic and Transportation engineering, FTTE 2022

作者： Zhang, Yi Li, Kaicheng Wei, Guodong Yuan, Lei Wang, Fei National Engineering Laboratory for Urban Rail Transit Communication and Operation Control Beijing Jiaotong University China State Key Lab of Rail Traffic Control & Safety Beijing Jiaotong University China Signal& Communication Research Institute of CARS

ISBN: (纸本)9781510657526

Formal methods are used to improve the credibility and correctness of scenarios in Chinese train control systems (CTCS). At present, there are few formal studies on the high-speed Automatic Train Operation system that developed from CTCS-3 level high-speed railway technology. In this paper, we adopt a new formal method, Alvis, which combines the advantages of high-level programming language and graphical modeling, and select the interzone TSRS handover scene in high-speed railway ATO system as the research object. The messaging behaviours of the scene are analyzed using UML sequence diagrams, and an Alvis model of the system is built, which is converted into an smv model supporting the formal validation of the model checking tool nuXmv. The real-time performance of the extracted messaging was verified on demand, inconsistency between technical specifications and actual operational scenarios was identified and solution was provided. The results of this method can provide some reference for the technical promotion of ATO train control system in China. © 2022 SPIE.

关键词： Formal methods

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Automatic Modulation Classification Based on CNN, LSTM and Attention Mechanism

Automatic Modulation Classification Based on CNN, LSTM and A...

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International Conference on Computer and Communications (ICCC)

作者： Zewen Wang Ping Wang Pingying Lan School of information science and technology Southwest Jiaotong University Chengdu China State Key Laboratory of Rail Transit Engineering Informatization FSDI Xi'an China

Automatic modulation recognition (AMR) is a key technology in the field of cognitive radio. To improve the performance, a new model for AMR, which incorporates an attention mechanism to extract the important features of the signal more effectively, is proposed in this paper. The simulation results show that our proposed method has a good recognition performance. In addition, our method can still achieve high accuracy, even if only a few samples are provided as the training set for training. We also visualize the output features of the model and show the positive effect of the attention mechanism on signal modulation category identification.

关键词： Training Simulation Computational modeling Modulation Data visualization Feature extraction Data models

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Research on Comprehensive Compensation Strategy for Long-distance Cable Traction Power System

Research on Comprehensive Compensation Strategy for Long-dis...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Dongiie Li Minwu Chen Jiadong Han Yinatao Chen Yinyu Chen Diwen Xiao School of Elcetrical Engineering Southwest Jiaotong University Chengdu China State Key Lab of Rail Transit Engineering Informatization Xian China NR Electric Co. Ltd. Southwest Jiaotong University Nanjing China

ISBN: (纸本)9781665409858

The construction of electrified railway faces power quality problems dominated by reactive power and negative sequence due to the complex terrain and weak power grid structure in highland areas. To solve the problems, this paper discusses the technical scheme of Long-distance Cable traction power supply system (LCTPS) and its control strategy. Firstly, a Long-distance cable power supply model is constructed and a reactive power compensation scheme applicable to this system is designed. Then, a reactive power negative sequence compensation scheme is designed based on the theory of cophase power supply. Furthermore, a comprehensive compensation control strategy was established based on IEEE standards. Finally, a simulation model is established to analyze the correctness of the compensation scheme and verify the effectiveness of the compensation strategy.

关键词： Industrial electronics Reactive power Analytical models Power cables Simulation Power quality IEEE Standards

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Research on the Application of Digital Twin in Bridge Rotation Construction

Research on the Application of Digital Twin in Bridge Rotati...

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International Conference on Computer Network, Electronic and Automation (ICCNEA)

作者： Yanming Liu Fei Xu Zhenghua Yang Yan Deng Xing Wang State Key Laboratory of Rail Transit Engineering Informatization(FSDI) Xi'an China School of Computer Science and Engineering Xi'an Technological University Xi'an China School of Architecture and Engineering Xi'an Technological University Xi'an China School of Ordnance Science and Technology Xi'an Technological University Xi'an China

With the continuous expansion of China's high-speed railway network, the construction of bridges spanning existing railway lines has become increasingly common. Bridge transition, as a solution for constructing bridges on existing tracks, is crucial for ensuring safety during the construction phase. This research aims to utilize digital twin technology to monitor the construction of bridge transitions and address the limitations of traditional bridge monitoring methods. We employed the Unity3D game engine to create a digital twin virtual scene and facilitated seamless data exchange between the physical and virtual domains using the OPC UA data exchange mechanism. Ultimately, we developed a prototype system for monitoring bridge transition construction. This system effectively monitors critical information and activities during bridge construction, providing early warning capabilities and decision support throughout the construction process. Through the design and implementation of the system prototype, we have confirmed the feasibility of applying digital twin technology in bridge transition construction.

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The knowledge modeling of bridge code for automated completeness checking

The knowledge modeling of bridge code for automated complete...

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International Conference on Computational Intelligence and Security

作者： Yang Xiao Zongjian Li Qin Zhao Yaqin Chen Hao Li School of Civil Engineering and Architecture Xi'an University of Technology Xi'an China State Key Laboratory of Rail Transit Engineering Informatization (FSDI) China Railway First Survey and Design Institute Group Ltd Xi'an China

Completeness checking of BrIM(Bridge Information Model) plays a critical role in identifying missing information according to standard documents and ensuring the depth of the designs. However, the method of traditional checking relies heavily on human work. To achieve automated completeness checking for BrIM, we propose a knowledge model construction method to solve the problem of standard specifications interpretation. Firstly, we expand the domain of the knowledge ontology based on Semantic Web technology, extract and integrate the collection of domain terms, define classes and property relationships in the ontology, and build the domain knowledge ontology. And then, we preprocess provisions to obtain single semantic rule sentences following the text characteristics of the Chinese delivery standard and construct multi-level logical expressions according to their different knowledge types. Finally, we build the domain knowledge model consisting of an ontology and logical expressions that can be used in the completeness checking of $\mathbf{BrIM}$ to describe the knowledge of codes and standards in the bridge design domain at a fine-grained level. The knowledge model improves the effectiveness and efficiency of the translation process and offers technical support for intelligent completeness checking.

关键词： Bridges Knowledge engineering Semantic Web Codes railway engineering Computational modeling Semantics

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An Intelligent Fault Diagnosis Model Based on FastDTW for railway Turnout 13

An Intelligent Fault Diagnosis Model Based on FastDTW for Ra...

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13th EAI International Conference on Mobile Multimedia Communications, Mobimedia 2020

作者： Wen-Jiang, Ji Zuo, Yuan Hei, XIN-Hong Fei, Rong School of Computer Science and Engineering Xi'an University of Technology Xi'an China State Key Laboratory of Rail Transit Engineering Informatization FSDI Xi'an China

ISBN: (纸本)9781631902710

The turnout handles the direction of the train which is one of the key equipment in the railway transportation system. In this paper, by using real action current data obtained from switch machine model ***7, a turnout fault diagnosis model based on the FastDTW pattern recognition algorithm was proposed. Firstly, the original current curve was segmented relate to the features of them. Then the warping path distance between the standard sample and the tested current curve was obtained according to FastDTW algorithm. Finally a dynamic optimized threshold was used to confirm whether there is a fault happened in the turnout. According to the experiment results, the proposed diagnose model without the prior knowledge of fault samples can works well both with single and double acting type turnout machines, owning to the following elements: the diagnose accuracy can be more than 96%, the time-cost can be improved more than 5 times compared with traditional DTW based algorithms. Copyright © 2020 EAI.

关键词： Failure analysis

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One Master Data Identification Method Based on Stacking Integration

One Master Data Identification Method Based on Stacking Inte...

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Digital Society and Intelligent Systems (DSInS), International Conference on

作者： Xiaojun Wu Yubo Dong Sheng Yuan Xiaochun Ren Wei Wang Cheng Zhang School of Software Engineering Xi’an Jiaotong University Xi’an China State Key Laboratory of Rail Transit Engineering Informatization (FSDI) Xi’an China

ISBN: (纸本)9781665406314

In the existing master data identification process, there are several problems, such as slow demand response and lack of targets, after the construction of information systems. One master data identification method based on stacking integration is proposed in this paper. Considering the characteristics of master data and the available elements in the conceptual design stage, seven master data identifiable metrics are selected. Master data recognition result belongs to either the positive class or the negative one, which can be converted into so-called Binary Classification problem. In order to identify the characteristics of different attributes within the indicator, the first step is to learn with specific learners, the second step is to stack and integrate the results of each learner, and the last and third step is to obtain the results of identification. The experiments use both the self-built dataset and the Titanic dataset. The results show that this method can reach the expectations. The feasibility and validity of the method are verified as well.

关键词： Measurement Stacking Demand response Object recognition Task analysis Intelligent systems Information systems

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Fast and Regularized Reconstruction of Building Fac Ades from Street-View Images Using Binary Integer Programming 24

Fast and Regularized Reconstruction of Building Fac Ades fro...

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2020 24th ISPRS Congress on Technical Commission II

作者： Hu, Han Wang, Libin Zhang, Mier Ding, Yulin Zhu, Qing State Key Laboratory of Rail Transit Engineering Informatization China Railway First Survey Design Institute Co. Ltd. Xian China Faculty of Geosciences and Environmental Engineering Southwest Jiaotong University Chengdu China

Regularized arrangement of primitives on building facądes to aligned locations and consistent sizes is important towards structured reconstruction of urban environment. Mixed integer linear programing was used to solve the problem, however, it is extremely time consuming even for state-of-the-art commercial solvers. Aiming to alleviate this issue, we cast the problem into binary integer programming, which omits the requirements for real value parameters and is more efficient to be solved. Firstly, the bounding boxes of the primitives are detected using the YOLOv3 architecture in real-time. Secondly, the coordinates of the upper left corners and the sizes of the bounding boxes are automatically clustered in a binary integer programming optimization, which jointly considers the geometric fitness, regularity and additional constraints;this step does not require a priori knowledge, such as the number of clusters or pre-defined grammars. Finally, the regularized bounding boxes can be directly used to guide the facąde reconstruction in an interactive environment. Experimental evaluations have revealed that the accuracies for the extraction of primitives are above 0.82, which is sufficient for the following 3D reconstruction. The proposed approach only takes about 10% to 20% of the runtime than previous approach and reduces the diversity of the bounding boxes to about 20% to 50%. © 2020 Copernicus GmbH. All rights reserved.

关键词： Integer programming

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Research on A Novel Compound Equinumerous-slot-pole Permanent Magnet Machine

Research on A Novel Compound Equinumerous-slot-pole Permanen...

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IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific)

作者： Yongtao Liang Zaixin Song Xiaoyu Lang Dianxun Xiao Yidan Ma Senyi Liu Department of Industrial and Systems Engineering State Key Lab of Ultra-Precision Machining Technology The Hong Kong Polytechnic University Hong Kong China Sustainable Energy and Environment Thrust Hong Kong University of Science and Technology (Guangzhou) China School of Automation Science and Engineering Xi'an Jiaotong University Xi’an China Institute of Rail Transit Tongji University Shanghai China

ISBN: (数字)9798331529277

ISBN: (纸本)9798331529307

Some direct-drive applications, such as robotic actuators and electric vehicle propulsion, demand efficient operation across a wide speed range and adaptable load capabilities. To address these requirements, this paper introduces a novel compound permanent magnet machine (PMM) featured with a compact equinumerous-slot-pole (ESP) structure. The proposed machine integrates a permanent magnet vernier machine (PMVM) and a permanent magnet synchronous machine (PMSM), combining the capabilities of both low-speed high-torque and high-speed efficient direct-drive. Meanwhile, the area of machine's high-efficiency zone (≥80%) is significantly expanded to over 83%. Finite Element Analysis (FEA) verifies the machine's basic electromagnetic performance, demonstrating its significant potential for emerging direct-drive applications.

关键词： Permanent magnet machines Torque Transportation Rotors Propulsion Topology Structural engineering Compounds Electromagnetics Robots

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