Railway Engineering Science最新文献_第2页

Exploring the feasibility of prestressed anchor cables as an alternative to temporary support in the excavation of super-large-span tunnel 探索预应力锚索作为超大跨度隧道开挖临时支护替代方案的可行性

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2024-06-05 DOI: 10.1007/s40534-024-00340-w

Shunhua Zhou, Yuyin Jin, Zhiyao Tian, Chunhua Zou, Heming Zhao, Zengrun Miao

{"title":"Exploring the feasibility of prestressed anchor cables as an alternative to temporary support in the excavation of super-large-span tunnel","authors":"Shunhua Zhou, Yuyin Jin, Zhiyao Tian, Chunhua Zou, Heming Zhao, Zengrun Miao","doi":"10.1007/s40534-024-00340-w","DOIUrl":"https://doi.org/10.1007/s40534-024-00340-w","url":null,"abstract":"Excavating super-large-span tunnels in soft rock masses presents significant challenges. To ensure safety, the sequential excavation method is commonly adopted. It utilizes internal temporary supports to spatially partition the tunnel face and divide the excavation into multiple stages. However, these internal supports generally impose spatial constraints, limiting the use of large-scale excavation equipment and reducing construction efficiency. To address this constraint, this study adopts the “Shed-frame” principle to explore the feasibility of an innovative support system, which aims to replace internal supports with prestressed anchor cables and thus provide a more spacious working space with fewer internal obstructions. To evaluate its effectiveness, a field case involving the excavation of a 24-m span tunnel in soft rock is presented, and an analysis of extensive field data is conducted to study the deformation characteristics of the surrounding rock and the mechanical behavior of the support system. The results revealed that prestressed anchor cables integrated the initial support with the shed, creating an effective “shed-frame” system, which successively maintained tunnel deformation and frame stress levels within safe regulatory bounds. Moreover, the prestressed anchor cables bolstered the surrounding rock effectively and reduced the excavation-induced disturbance zone significantly. In summary, the proposed support system balances construction efficiency and safety. These field experiences may offer valuable insights into the popularization and further development of prestressed anchor cable support systems.","PeriodicalId":41270,"journal":{"name":"Railway Engineering Science","volume":"90 1","pages":""},"PeriodicalIF":6.3,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141259581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Flow and sound fields of scaled high-speed trains with different coach numbers running in long tunnel 不同车厢号的按比例高速列车在长隧道中运行时的流场和声场

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2024-06-05 DOI: 10.1007/s40534-024-00330-y

Qiliang Li, Yuqing Sun, Menghan Ouyang, Zhigang Yang

{"title":"Flow and sound fields of scaled high-speed trains with different coach numbers running in long tunnel","authors":"Qiliang Li, Yuqing Sun, Menghan Ouyang, Zhigang Yang","doi":"10.1007/s40534-024-00330-y","DOIUrl":"https://doi.org/10.1007/s40534-024-00330-y","url":null,"abstract":"Segregated incompressible large eddy simulation and acoustic perturbation equations were used to obtain the flow field and sound field of 1:25 scale trains with three, six and eight coaches in a long tunnel, and the aerodynamic results were verified by wind tunnel test with the same scale two-coach train model. Time-averaged drag coefficients of the head coach of three trains are similar, but at the tail coach of the multi-group trains it is much larger than that of the three-coach train. The eight-coach train presents the largest increment from the head coach to the tail coach in the standard deviation (STD) of aerodynamic force coefficients: 0.0110 for drag coefficient (Cd), 0.0198 for lift coefficient (Cl) and 0.0371 for side coefficient (Cs). Total sound pressure level at the bottom of multi-group trains presents a significant streamwise increase, which is different from the three-coach train. Tunnel walls affect the acoustic distribution at the bottom, only after the coach number reaches a certain value, and the streamwise increase in the sound pressure fluctuation of multi-group trains is strengthened by coach number. Fourier transform of the turbulent and sound pressures presents that coach number has little influence on the peak frequencies, but increases the sound pressure level values at the tail bogie cavities. Furthermore, different from the turbulent pressure, the first two sound pressure proper orthogonal decomposition (POD) modes in the bogie cavities contain 90% of the total energy, and the spatial distributions indicate that the acoustic distributions in the head and tail bogies are not related to coach number.","PeriodicalId":41270,"journal":{"name":"Railway Engineering Science","volume":"21 1","pages":""},"PeriodicalIF":6.3,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141259477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Experimental study and numerical simulation of the impact of under-sleeper pads on the dynamic and static mechanical behavior of heavy-haul railway ballast track 轨枕下垫对重载铁路无砟轨道动静态机械性能影响的实验研究与数值模拟

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2024-05-25 DOI: 10.1007/s40534-024-00337-5

Yihao Chi, Hong Xiao, Yang Wang, Zhihai Zhang, Mahantesh M. Nadakatti

{"title":"Experimental study and numerical simulation of the impact of under-sleeper pads on the dynamic and static mechanical behavior of heavy-haul railway ballast track","authors":"Yihao Chi, Hong Xiao, Yang Wang, Zhihai Zhang, Mahantesh M. Nadakatti","doi":"10.1007/s40534-024-00337-5","DOIUrl":"https://doi.org/10.1007/s40534-024-00337-5","url":null,"abstract":"Laying the under-sleeper pad (USP) is one of the effective measures commonly used to delay ballast degradation and reduce maintenance workload. To explore the impact of application of the USP on the dynamic and static mechanical behavior of the ballast track in the heavy-haul railway system, numerical simulation models of the ballast bed with USP and without USP are presented in this paper by using the discrete element method (DEM)—multi-flexible body dynamic (MFBD) coupling analysis method. The ballast bed support stiffness test and dynamic displacement tests were carried out on the actual operation of a heavy-haul railway line to verify the validity of the models. The results show that using the USP results in a 43.01% reduction in the ballast bed support stiffness and achieves a more uniform distribution of track loads on the sleepers. It effectively reduces the load borne by the sleeper directly under the wheel load, with a 7.89% reduction in the pressure on the sleeper. Furthermore, the laying of the USP changes the lateral resistance sharing ratio of the ballast bed, significantly reducing the stress level of the ballast bed under train loads, with an average stress reduction of 42.19 kPa. It also reduces the plastic displacement of ballast particles and lowers the peak value of rotational angular velocity by about 50% to 70%, which is conducive to slowing down ballast bed settlement deformation and reducing maintenance costs. In summary, laying the USP has a potential value in enhancing the stability and extending the lifespan of the ballast bed in heavy-haul railway systems.","PeriodicalId":41270,"journal":{"name":"Railway Engineering Science","volume":"73 1","pages":""},"PeriodicalIF":6.3,"publicationDate":"2024-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141151943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Low-frequency oscillation of train–network system considering traction power supply mode 考虑牵引供电模式的列车网络系统低频振荡

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2024-02-19 DOI: 10.1007/s40534-023-00328-y

Yuchen Liu, Xiaoqin Lyu, Mingyuan Chang, Qiqi Yang

{"title":"Low-frequency oscillation of train–network system considering traction power supply mode","authors":"Yuchen Liu, Xiaoqin Lyu, Mingyuan Chang, Qiqi Yang","doi":"10.1007/s40534-023-00328-y","DOIUrl":"https://doi.org/10.1007/s40534-023-00328-y","url":null,"abstract":"The low-frequency oscillation (LFO) has occurred in the train–network system due to the introduction of the power electronics of the trains. The modeling and analyzing method in current researches based on electrified railway unilateral power supply system are not suitable for the LFO analysis in a bilateral power supply system, where the trains are supplied by two traction substations. In this work, based on the single-input and single-output impedance model of China CRH5 trains, the node admittance matrices of the train–network system both in unilateral and bilateral power supply modes are established, including three-phase power grid, traction transformers and traction network. Then the modal analysis is used to study the oscillation modes and propagation characteristics of the unilateral and bilateral power supply systems. Moreover, the influence of the equivalent inductance of the power grid, the length of the transmission line, and the length of the traction network are analyzed on the critical oscillation mode of the bilateral power supply system. Finally, the theoretical analysis results are verified by the time-domain simulation model in MATLAB/Simulink.","PeriodicalId":41270,"journal":{"name":"Railway Engineering Science","volume":"4 1","pages":""},"PeriodicalIF":6.3,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139911161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

A framework for dynamic modelling of railway track switches considering the switch blades, actuators and control systems 考虑道岔叶片、执行器和控制系统的铁路道岔动态建模框架

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2024-01-09 DOI: 10.1007/s40534-023-00324-2

Saikat Dutta, Tim Harrison, Christopher Ward, Roger Dixon, Phil Winship

{"title":"A framework for dynamic modelling of railway track switches considering the switch blades, actuators and control systems","authors":"Saikat Dutta, Tim Harrison, Christopher Ward, Roger Dixon, Phil Winship","doi":"10.1007/s40534-023-00324-2","DOIUrl":"https://doi.org/10.1007/s40534-023-00324-2","url":null,"abstract":"The main contribution of this paper is the development and demonstration of a novel methodology that can be followed to develop a simulation twin of a railway track switch system to test the functionality in a digital environment. This is important because, globally, railway track switches are used to allow trains to change routes; they are a key part of all railway networks. However, because track switches are single points of failure and safety-critical, their inability to operate correctly can cause significant delays and concomitant costs. In order to better understand the dynamic behaviour of switches during operation, this paper has developed a full simulation twin of a complete track switch system. The approach fuses finite element for the rail bending and motion, with physics-based models of the electromechanical actuator system and the control system. Hence, it provides researchers and engineers the opportunity to explore and understand the design space around the dynamic operation of new switches and switch machines before they are built. This is useful for looking at the modification or monitoring of existing switches, and it becomes even more important when new switch concepts are being considered and evaluated. The simulation is capable of running in real time or faster meaning designs can be iterated and checked interactively. The paper describes the modelling approach, demonstrates the methodology by developing the system model for a novel “REPOINT” switch system, and evaluates the system level performance against the dynamic performance requirements for the switch. In the context of that case study, it is found that the proposed new actuation system as designed can meet (and exceed) the system performance requirements, and that the fault tolerance built into the actuation ensures continued operation after a single actuator failure.","PeriodicalId":41270,"journal":{"name":"Railway Engineering Science","volume":"102 1","pages":""},"PeriodicalIF":6.3,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139409921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Train-induced aerodynamic characteristics of vertical sound barriers influenced by several factors 受多种因素影响的垂直声屏障的列车诱导空气动力特性

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2024-01-06 DOI: 10.1007/s40534-023-00326-0

Xiaowei Qiu, Xiaozhen Li, Jing Zheng, Ming Wang

引用次数: 0

Increasing realism in modelling energy losses in railway vehicles and their impact to energy-efficient train control 提高铁路车辆能量损失建模的逼真度及其对节能列车控制的影响

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2024-01-05 DOI: 10.1007/s40534-023-00322-4

Michael Nold, Francesco Corman

引用次数: 0

Computer vision-aided DEM study on the compaction characteristics of graded subgrade filler considering realistic coarse particle shapes 计算机视觉辅助 DEM 对考虑实际粗颗粒形状的级配路基填料压实特性的研究

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2023-12-08 DOI: 10.1007/s40534-023-00325-1

Taifeng Li, Kang Xie, Xiaobin Chen, Zhixing Deng, Qian Su

{"title":"Computer vision-aided DEM study on the compaction characteristics of graded subgrade filler considering realistic coarse particle shapes","authors":"Taifeng Li, Kang Xie, Xiaobin Chen, Zhixing Deng, Qian Su","doi":"10.1007/s40534-023-00325-1","DOIUrl":"https://doi.org/10.1007/s40534-023-00325-1","url":null,"abstract":"The compaction quality of subgrade filler strongly affects subgrade settlement. The main objective of this research is to analyze the macro- and micro-mechanical compaction characteristics of subgrade filler based on the real shape of coarse particles. First, an improved Viola–Jones algorithm is employed to establish a digitalized 2D particle database for coarse particle shape evaluation and discrete modeling purposes of subgrade filler. Shape indexes of 2D subgrade filler are then computed and statistically analyzed. Finally, numerical simulations are performed to quantitatively investigate the effects of the aspect ratio (AR) and interparticle friction coefficient (μ) on the macro- and micro-mechanical compaction characteristics of subgrade filler based on the discrete element method (DEM). The results show that with the increasing AR, the coarse particles are narrower, leading to the increasing movement of fine particles during compaction, which indicates that it is difficult for slender coarse particles to inhibit the migration of fine particles. Moreover, the average displacement of particles is strongly influenced by the AR, indicating that their occlusion under power relies on particle shapes. The displacement and velocity of fine particles are much greater than those of the coarse particles, which shows that compaction is primarily a migration of fine particles. Under the cyclic load, the interparticle friction coefficient μ has little effect on the internal structure of the sample; under the quasi-static loads, however, the increase in μ will lead to a significant increase in the porosity of the sample. This study could not only provide a novel approach to investigate the compaction mechanism but also establish a new theoretical basis for the evaluation of intelligent subgrade compaction.","PeriodicalId":41270,"journal":{"name":"Railway Engineering Science","volume":"164 1","pages":""},"PeriodicalIF":6.3,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138553090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Torque effect on vibration behavior of high-speed train gearbox under internal and external excitations 内外激励下高速列车齿轮箱振动特性的转矩影响

1区工程技术

Railway Engineering Science Pub Date : 2023-11-14 DOI: 10.1007/s40534-023-00323-3

Yue Zhou, Xi Wang, Hongbo Que, Rubing Guo, Xinhai Lin, Siqin Jin, Chengpan Wu, Yu Hou

{"title":"Torque effect on vibration behavior of high-speed train gearbox under internal and external excitations","authors":"Yue Zhou, Xi Wang, Hongbo Que, Rubing Guo, Xinhai Lin, Siqin Jin, Chengpan Wu, Yu Hou","doi":"10.1007/s40534-023-00323-3","DOIUrl":"https://doi.org/10.1007/s40534-023-00323-3","url":null,"abstract":"Abstract The high-speed train transmission system, experiencing both the internal excitation originating from gear meshing and the external excitation originating from the wheel–rail interaction, exhibits complex dynamic behavior in the actual service environment. This paper focuses on the gearbox in the high-speed train to carry out the bench test, in which various operating conditions (torques and rotation speeds) were set up and the excitation condition covering both internal and external was created. Acceleration responses on multiple positions of the gearbox were acquired in the test and the vibration behavior of the gearbox was studied. Meanwhile, a stochastic excitation modal test was also carried out on the test bench under different torques, and the modal parameter of the gearbox was identified. Finally, the sweep frequency response of the gearbox under gear meshing excitation was analyzed through dynamic modeling. The results showed that the torque has an attenuating effect on the amplitude of gear meshing frequency on the gearbox, and the effect of external excitation on the gearbox vibration cannot be ignored, especially under the rated operating condition. It was also found that the torque affects the modal parameter of the gearbox significantly. The torque has a great effect on both the gear meshing stiffness and the bearing stiffness in the transmission system, which is the inherent reason for the changed modal characteristics observed in the modal test and affects the vibration behavior of the gearbox consequently.","PeriodicalId":41270,"journal":{"name":"Railway Engineering Science","volume":"121 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134956885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Traction power systems for electrified railways: evolution, state of the art, and future trends 电气化铁路的牵引动力系统:发展、现状和未来趋势

1区工程技术

Railway Engineering Science Pub Date : 2023-11-14 DOI: 10.1007/s40534-023-00320-6

Haitao Hu, Yunjiang Liu, Yong Li, Zhengyou He, Shibin Gao, Xiaojuan Zhu, Haidong Tao

{"title":"Traction power systems for electrified railways: evolution, state of the art, and future trends","authors":"Haitao Hu, Yunjiang Liu, Yong Li, Zhengyou He, Shibin Gao, Xiaojuan Zhu, Haidong Tao","doi":"10.1007/s40534-023-00320-6","DOIUrl":"https://doi.org/10.1007/s40534-023-00320-6","url":null,"abstract":"Abstract Traction power systems (TPSs) play a vital role in the operation of electrified railways. The transformation of conventional railway TPSs to novel structures is not only a trend to promote the development of electrified railways toward high-efficiency and resilience but also an inevitable requirement to achieve carbon neutrality target. On the basis of sorting out the power supply structures of conventional AC and DC modes, this paper first reviews the characteristics of the existing TPSs, such as weak power supply flexibility and low-energy efficiency. Furthermore, the power supply structures of various TPSs for future electrified railways are described in detail, which satisfy longer distance, low-carbon, high-efficiency, high-reliability and high-quality power supply requirements. Meanwhile, the application prospects of different traction modes are discussed from both technical and economic aspects. Eventually, this paper introduces the research progress of mixed-system electrified railways and traction power supply technologies without catenary system, speculates on the future development trends and challenges of TPSs and predicts that TPSs will be based on the continuous power supply mode, employing power electronic equipment and intelligent information technology to construct a railway comprehensive energy system with renewable energy.","PeriodicalId":41270,"journal":{"name":"Railway Engineering Science","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134956871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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