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analysis of Cross-section Area of Tunnel Clearance Above Rail Surface for Railways in Plateau Regions Based on One-dimensional Flow Model and Numerical Iterative Solution Method 8

Analysis of Cross-section Area of Tunnel Clearance Above Rai...

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8th International conference on Hydraulic and Civil engineering - Deep Space Intelligent Development and Utilization Forum (ICHCE)

作者： Yang, Li China Railway First Survey & Design Inst Grp Co L Bridge & Tunnel Design Inst Xian Peoples R China

ISBN: (纸本)9781665465533

this paper is intended to figure out the cross-section area of tunnel clearance above rail surface for single-track railways in plateau regions. All dimensional relationships are derived by applying the one-dimensional compressible unsteady non-homentropic flow model and generalized Riemann variable characteristic line method, and the equations are iteratively solved by using a numerical method to generate pressure fluctuation in the tunnels on the 160 km/h single-track railways in plateau regions. the economical and technically reasonable cross-section area of tunnel clearance is finally determined based on the comfort indexes. Based on the study results, in order to overcome the great impacts on the physical and mental health of passengers in the plateau environment and improve the operation and service level of railways in plateau regions, it is necessary to improve the vehicle tightness and apply the comprehensive transient pressure index stipulated in UIC 660 as the recommended index for railway construction in plateau regions. the requirements are concluded for the critical cross-section area of tunnel clearance above rail surface and the vehicle tightness index for 160 km/h single-track railways from calculation and analysis.

关键词： railways in plateau regions transient pressure one-dimensional flow model iterative solution

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analysis of the Phase-Shift Full-Bridge Converter in 400V and 800V DC Fast Charging Stations 8

Analysis of the Phase-Shift Full-Bridge Converter in 400V an...

引用

8th Southern Power Electronics conference and the 17th Brazilian Power Electronics conference, SPEC / COBEP 2023

作者： Bandeira, Camila M. Medina G, Néstor I. Azevedo, Gustavo M. S. Neto, Rafael C. Limongi, Leonardo R. Cavalcanti, Marcelo C. Federal University of Pernambuco Dept. of Electrical Engineering Recife Brazil

ISBN: (纸本)9798350321128

the electric vehicle (EV) market is transitioning towards the adoption of vehicles with 400V and 800V batteries. this wide range of voltage operation requires careful consideration when selecting a converter topology for an EV charging station (CS). In this context, the Phase-Shift Full-Bridge (PSFB) converter emerges as an interesting solution due to its widespread use and recommendation in high-power, high-voltage applications. the advantages of PSFB converter includes zero voltage switching operation in the active switches in the primary side, important at achieving high efficiencies levels while operating at high frequencies. thus, this paper presents the design of a PSFB converter for both 400V and 800V CS, and discusses the various aspects of its utilization. © 2023 IEEE.

关键词： battery charger fast charging station off-board charger phase-shift full-bridge converter soft-switching

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Sensor Dynamic Modeling Based on GWO-LSSVM 8

Sensor Dynamic Modeling Based on GWO-LSSVM

引用

8th International conference on Mechanical engineering and Automation Science, ICMEAS 2022

作者： An, Qi Fu, Liyue Zhang, Ancai College of Automation and Electrical Engineering Linyi University Linyi China

ISBN: (数字)9781665463058

ISBN: (纸本)9781665463058

Sensor dynamic modeling is an important way to study the working mechanism of the sensor, evaluate the dynamic performance index and design the dynamic correction link. Aiming at the problem that it is difficult to accuratly model the nonlinear and dynamic characteristics of sensor dynamics, a sensor dynamic modeling way is proposed. Based on the regression analysis algorithm of the LSSVM, the adjustable parameters are selected by the gray wolf optimization algorithm, and finally the dynamic model of the sensor is established. the simulation results show that the model built by GWO-LSSVM has strong practicability and reliability, and provides a reference for improving the dynamic performance of the sensor and online compensation. © 2022 IEEE.

关键词： Regression analysis

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Numerical analysis of thermal Recovery Performance of Enhanced Geothermal System 8th

Numerical Analysis of Thermal Recovery Performance of Enhanc...

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8th International conference on Advances in Energy Resources and Environment engineering, ICAESEE 2022

作者： Guo, Maosheng Ji, Changfa Zhang, Yifei Tang, Ye School of Energy Xi’an University of Science and Technology Shaanxi Xi’an710054 China

ISBN: (纸本)9783031425622

In order to analyze the effects of fracture width and fluid velocity on the heat transfer performance of enhanced geothermal system, this paper uses CO2 as the heat transfer medium of EGS, adopts the orthogonal experimental design method, selects a three-factor and three-level orthogonal experimental table, and analyzes the effects of fracture width and fluid velocity in the fracture on the heat recovery performance of ESG and its change law based on CFD method. the analysis results show that: the influence of fluid velocity on reservoir heat recovery performance is greater than that of fracture width on reservoir heat recovery performance;the net heat extraction rate of the system decreases with the decrease of fluid velocity in the fracture and decreases with the decrease of fracture width;the reduction rate of net heat extraction rate of the system increases about 10% for each decrease of fluid velocity in the fracture by 0.001 m/s;the reduction rate of single-slit heat extraction rate increases about 10% for each decrease of fracture width by 0.002 m. the reduction rate of net heat extraction rate increases by about 3% for each 0.002 m reduction in fracture width. © the Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Fracture

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Comparative analysis of the Displacement Dynamic Load Allowance and Bending Moment Dynamic Load Allowance of Highway Continuous Girder Bridge 8th

Comparative Analysis of the Displacement Dynamic Load Allowa...

引用

8th International conference on Civil engineering (ICCE)

作者： Fan, Kaixiang Changan Univ Sch Highway Xian 710064 Shaanxi Peoples R China

ISBN: (纸本)9789811912603;9789811912597

the dynamic load allowance (DLA) of the bridge structure is an important parameter in the bridge design. In order to study the variation law of displacement DLA and bending moment DLA of continuous girder bridge, taking 2 x 30 m continuous girder bridge and five-axis vehicles as the research object, the road roughness was simulated by the trigonometric series approach. With the help of ANSYS and APDL language, the influence of vehicle speeds, vehicle weights and road roughness on the displacement DLA and bending moment DLA are studied. the results show that the displacement DLA showed increasing trend with the increase of vehicle speed, and bending moment DLA showed increasing first and then decreasing;With the increase of body weight, the displacement DLA and bending moment DLA show a gradually increasing trend;Displacement DLA and bending moment DLA do have numerical differences. And the value of the displacement DLA is slightly larger than the value of the bending moment DLA. It is suggested that the displacement DLA and bending moment DLA should be distinguished in engineering design and dynamic load test. the research conclusion can provide reference for bridge structure engineering design and dynamic load test.

关键词： Bridge engineering Continuous girder bridge Vehicle-bridge interaction Dynamic load allowance Time-history curve

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Enhancing Self-Driving Capabilities: A design Architecture Leveraging Sensor systems and Cloud Computing 11

Enhancing Self-Driving Capabilities: A Design Architecture L...

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11th International conference on Traffic and Logistic engineering, ICTLE 2023

作者： Xiao, Ruitong Jiang, Yueyin Chengdu University of Technology Chengdu China

ISBN: (纸本)9798350339642

this paper endeavors to accomplish Level 4 and Level 5 self-driving by devising a design architecture for cloud-based self-driving vehicles. It incorporates a hybrid positioning navigation method [24, 25] and diverse sensing systems [9, 5, 7, 27] to capture precise environmental information, along with Inertial Measurement Unit (IMU) sensors and wheel odometry to complement other sensors and improve positioning accuracy and stability [26, 27, 25]. the architecture utilizes a combination of Vehicular Ad hoc Network (VANET), Internet of Vehicles (IoV), and in-vehicle millimeter wave systems for high-level information communication [9, 8]. To enable real-time monitoring, analysis, and application of vehicle data, the architecture leverages cloud computing, particularly the Amazon Web Services (AWS) platform [10, 11], and takes into account data security risks. the research in this paper is important for promoting the development of autonomous driving technology and provides valuable references for research and practical applications in related fields. © 2023 IEEE.

关键词： Cloud computing

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design and analysis of Static Stress on Hydraulic Table Dies Replacement 8

Design and Analysis of Static Stress on Hydraulic Table Dies...

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8th IEEE International conference on Computing, engineering and design, ICCED 2022

作者： Arohman, Abdul Wahid Agustin, Desy Sudrajat, Hasan Agus, Muhamad Solihin, Solihin Akbar, Muhammad Rizqi Politeknik STMI Jakarta Automotive Engineering Technology Jakarta Indonesia

ISBN: (纸本)9781665453899

Today's Manufacturing Industry requires equipment that can work automatically so that it can increase productivity, shorten production time, and also reduce production costs. To be able to provide solutions to the current needs of the Manufacturing Industry, this research designs a piece of equipment that can support these production activities to run better. the equipment in question is a hydraulic table which is expected to help reduce set-up time during the dies replacement process. In addition to reducing set-up time, this system makes the machine more flexible in the face of design changes that can occur at any time. Method that use in this research is using design of the dies replacement tool is made with a weight capacity of 4 tons. the material used in the design of the dies replacement is the ASTM A572 Grade 50 hydraulic table frame material, the shaft material used is AISI 5210 517 H, and the iron material with the conveyor frame uses UNP 125 material with the ASTM A36 code. the design is done with the help of a computer program using Fusion 360 software. After the design process is complete, an analysis of the construction in the form of static stress will be used as a reference for the machining process. the result after machining and assembly process done will later be used at PT Ganding Toolsindo. © 2022 IEEE.

关键词： Dies

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design and performance analysis of visible light communication system with noise mitigation 8

Design and performance analysis of visible light communicati...

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8th International conference on engineering and Emerging Technologies, ICEET 2022

作者： Maurya, Vikram Maddila, Ravi Kumar Malaviya National Institute of Technology Jaipur Department of Electronics and Communication Engineering Jaipur India

ISBN: (纸本)9781665491068

A Non Return to Zero On Off Keyed Visible Light Communication (VLC) system is constructed and simulated, with and without noise using a light emitting diode of wavelength 450 nm as an optical source. A PIN photo-diode is used as a photo-detector in the receiver. Another white light source having power of 6W is used as a noise generator to analyse the performance and quality of the VLC system. An optical rectangular filter is used to eliminate the generated noise. Performance of the system is analyzed by the values of Quality Factor and Bit Error Rate. Separation of two optical signals is also explored by using linear polarizers. © 2022 IEEE.

关键词： Amplitude shift keying

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Measurement Data analysis of Deformation Coupling Relationship between Foundation Pit and Nearby Tunnels 8

Measurement Data Analysis of Deformation Coupling Relationsh...

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8th International conference on Hydraulic and Civil engineering - Deep Space Intelligent Development and Utilization Forum (ICHCE)

作者： Shen, Danyi Chen, Yun Luo, Min-Min Liang, Cheng Huang, Jia-sheng Zhejiang Univ Hangzhou Peoples R China Zhejiang Univ Co Ltd Architectural Design & Res Inst Hangzhou Peoples R China Zhejiang Univ Ctr Balance Architecture Hangzhou Peoples R China China Three Gorges Corp Inst Sci & Technol Beijing Peoples R China

ISBN: (纸本)9781665465533

the influences of foundation pit (FP) excavation on the deformation of nearby shield tunnels are significant. However, the quantitative analysis of deformation of FP excavation and nearby shield tunnel is still lacking. this study measures the displacement during FP excavation, and analyzes the quantitative correlation between the displacement and convergence of shield tunnel and the displacement of deep soil. the results show that horizontal deformation of nearby tunnels on the side can be estimated by horizontal displacement of deep soil outside the FP. the increment of both horizontal displacement and horizontal convergence of the shield tunnel caused by FP excavation have linear correlation with the increment of deep soil horizontal displacement. this result can be used to guide the similar cases.

关键词： foundation pit excavation shield tunnel deformation coupling measured analysis

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Relative Robustness Index of RC Frame After Long-Term Operation 8th

Relative Robustness Index of RC Frame After Long-Term Operat...

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8th International conference on Construction, Architecture and Technosphere Safety, ICCATS 2024

作者： Savin, S. Stupak, M. Mankov, D. Moscow State University of Civil Engineering 26 Yaroslavskoe Shosse Moscow129337 Russia

ISBN: (纸本)9783031804816

the paper analyzes the influence of static preloading of the reinforced concrete frame of a building on its relative robustness index under the scenario of a column removal. the study was based on quasi-static finite element analysis, taking into account physical and geometric nonlinearity. the constitutive diagrams of concrete took into account the rheological properties of the material in the static-dynamic loading regime. For this purpose, the integral module concept proposed by Bondarenko was adopted. Numerical modeling has shown that the values of fracture load and the relative robustness index decrease for model accounted for rheological properties of concrete compared to model that did not consider such properties. the revealed effect is caused by the growth of deformations in eccentrically compressed members as a result of creep and shrinkage. thus, the factor of long-term operation can have a negative impact on the robustness of reinforced concrete structures under accidental actions, such as a column removal scenario. this effect should be considered in the structural design of reinforced concrete building frames. © the Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Concrete buildings

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