Proceedings of the Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit最新文献_第4页

Nonlinear impedance characteristics of a gas hydraulic energy absorber and performance prediction for railway transportation of valuable goods 气体液压能量吸收器的非线性阻抗特性及贵重物品铁路运输的性能预测

IF 2 4区工程技术

Proceedings of the Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit Pub Date : 2024-04-29 DOI: 10.1177/09544097241249504

Wenlin Wang, Hongyou Liu, Dazhuo Wu, Yongming Wu, Jian Zhao

{"title":"Nonlinear impedance characteristics of a gas hydraulic energy absorber and performance prediction for railway transportation of valuable goods","authors":"Wenlin Wang, Hongyou Liu, Dazhuo Wu, Yongming Wu, Jian Zhao","doi":"10.1177/09544097241249504","DOIUrl":"https://doi.org/10.1177/09544097241249504","url":null,"abstract":"It is meaningful to investigate the nonlinear impedance characteristics of gas hydraulic energy absorbers (GHEAs) and their potential application in modern railway transportation of valuable goods. Fluid-mechanics-based full parametric modelling of a GHEA used in a high-speed train is performed, both simulations with the developed mathematic model and physical experiments are carried out on the static and dynamic characteristics of the GHEA. The agreement between the results of the simulation and the experiment with tolerable deviations validates the nonlinear mathematic model. Longitudinal train dynamics (LTD) modelling and simulation of a Chinese rapid freight train with the validated GHEA model or the conventional MT-2 friction-type energy absorber model is finally conducted. The results show that when the train uses GHEAs instead of MT-2 energy absorbers, the coupler forces and vehicle accelerations of the train are significantly reduced, and the vehicles operate more steadily in situations such as train startup, emergency braking and shunting operations; thus, gas hydraulic energy absorber is protective and would be alternative for equipping rapid freight trains for the transportation of valuable goods. The obtained nonlinear mathematic model in terms of the structural, oil and gas property parameters of the GHEA is useful and meaningful in further parameter design optimization of GHEAs and optimal specification of GHEAs for rapid freight trains.","PeriodicalId":54567,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit","volume":"86 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140842296","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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Wheel-rail contact wear analysis on curved lubricated track for heavy haul locomotive studies 用于重型牵引机车研究的弯曲润滑轨道上的轮轨接触磨损分析

IF 2 4区工程技术

Proceedings of the Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit Pub Date : 2024-04-03 DOI: 10.1177/09544097241244411

Yan Quan Sun, Maksym Spiryagin, Qing Wu, Colin Cole

引用次数: 0

Force transmission and height adjustment stability of the new height adjustable long pillow ballastless track 新型高度可调长枕式无砟轨道的力传递和高度调节稳定性

IF 2 4区工程技术

Proceedings of the Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit Pub Date : 2024-03-28 DOI: 10.1177/09544097241241418

Zhenxing He, Cheng Luo, Shuzhen Wang, Jianfeng Yun, Quanbao Feng

{"title":"Force transmission and height adjustment stability of the new height adjustable long pillow ballastless track","authors":"Zhenxing He, Cheng Luo, Shuzhen Wang, Jianfeng Yun, Quanbao Feng","doi":"10.1177/09544097241241418","DOIUrl":"https://doi.org/10.1177/09544097241241418","url":null,"abstract":"To address the settlement issue in high-speed railway foundations, the present study introduces a novel ballastless track system called NHABT (New height-adjustable ballastless track). This paper outlines the structural characteristics of the track and provides a detailed explanation of the methodology employed for height adjustment. To account for the unique properties of the NHABT structure, this study establishes finite element and vehicle-track coupling dynamics models. Firstly, under wheel load conditions, the study investigates the stress distribution of the NHABT structure and analyzes the influence of track bed length, thickness, and height adjustment on the force transfer characteristics of the NHABT structure. Secondly, the impact of height adjustment on the quality of vehicle operation and the stability of the NHABT structure is examined. The results indicate that adjusting the NHABT structure within a range of 20 to 200 mm is achievable by changing the side support pad or sleeper. The maximum stress occurs in the folded corner area on both sides of the sleeper groove. The force transfer characteristics of the NHABT structure are not affected by the length of the track bed, but its thickness significantly influences the stress in the folding corner area of the sleeper groove. The vehicle running quality and the stability of the NHABT structure after the adjustment are maintained at the same level as before the adjustment.","PeriodicalId":54567,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit","volume":"15 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140324414","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

A computational fluid dynamics study of the influence of sleeper shape and ballast depth on ballast flight during passage of a simplified train 简化列车通过时枕木形状和道碴深度对道碴飞行影响的计算流体动力学研究

IF 2 4区工程技术

Proceedings of the Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit Pub Date : 2024-03-27 DOI: 10.1177/09544097231226148

Lee Pardoe, William Powrie, Zhiwei Hu

{"title":"A computational fluid dynamics study of the influence of sleeper shape and ballast depth on ballast flight during passage of a simplified train","authors":"Lee Pardoe, William Powrie, Zhiwei Hu","doi":"10.1177/09544097231226148","DOIUrl":"https://doi.org/10.1177/09544097231226148","url":null,"abstract":"The paper assesses the effect on the air flow regime underneath a simplified high-speed train of changing the ballast depth and the sleeper shape, with regard to its potential for causing ballast flight or pickup. The study was carried out numerically using the commercial Computational Fluid Dynamics (CFD) software AnSys Fluent. The flow profile beneath the underbody of the train was generated by means of a moving wall above the track. The Delayed Detached Eddy Simulation (DDES) with the SST [Formula: see text] turbulence model was used to simulate turbulent flow, and the ballast bed roughness was applied parametrically using the wall roughness feature when resolving the boundary layer. CFD simulations were validated for flow over a cube, showing good agreement with experimental results. Up to three different depths to the ballast surface and three different sleeper profiles were investigated. Velocity profiles and aerodynamic forces on cubes placed between or on top of the sleeper blocks were used to assess the propensity of individual ballast grains for movement. For a standard G44 sleeper, increasing the ballast depth and/or the ballast bed roughness was found to reduce aerodynamic loads on an individual ballast grain. A ballast grain on top of the sleeper is more prone to uplift than a grain on the surface of the ballast bed in the crib. A curved upper surface to the sleeper is beneficial in that it prevents ballast from settling on top, the most vulnerable position. However, the reduced flow separation associated with the curved top may increase the likelihood of ballast pickup from the crib. Hence new sleeper shapes intended to reduce the potential for ballast flight should not only prevent ballast from settling on top, but also increase flow separation through the provision of a sharp surface. A prismatic sleeper shape that achieves both is suggested.","PeriodicalId":54567,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit","volume":"25 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316000","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

Novel in-situ real-time line scan optical monitoring of wear and surface damage initiation in a laboratory twin disc test 在实验室双圆盘试验中对磨损和表面损伤起始点进行现场实时线扫描光学监测的新方法

IF 2 4区工程技术

Proceedings of the Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit Pub Date : 2024-03-26 DOI: 10.1177/09544097241242169

Adam PG Wilby, Jacob Corteen, Roger Lewis, David I Fletcher

{"title":"Novel in-situ real-time line scan optical monitoring of wear and surface damage initiation in a laboratory twin disc test","authors":"Adam PG Wilby, Jacob Corteen, Roger Lewis, David I Fletcher","doi":"10.1177/09544097241242169","DOIUrl":"https://doi.org/10.1177/09544097241242169","url":null,"abstract":"A new optical monitoring system has been developed to photograph in-situ in real time the initiation of damage on the running surface of a rail steel twin-disc sample undergoing wear testing. The line-scan camera system has been demonstrated on the Sheffield University ROlling Sliding 2 (SUROS2) twin-disc machine. The results show the system can continuously track the development of wear flakes, with wear flake initiation and stabilisation of wear flake size observed without test interruption for the first time. Image analysis to quantify the total wear flake shadow pixel count showed a good correlation with the mass loss results, indicating the potential for the optical data to quantify rail steel wear without interruption to testing. Furthermore, in a water-lubricated test the new system enables observation of rolling contact fatigue (RCF) crack initiation through a water layer present on the specimens, without requiring test interruption. The improving knowledge of the wear and RCF performance of rail steels available from the new observation method can help improve understanding of steel performance and support to the selection of rail steel grades according to their performance.","PeriodicalId":54567,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit","volume":"72 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140315915","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

Using digital image correlation (DIC) to measure railway ballast movement in full-scale laboratory testing of sleeper lateral resistance 在枕木横向阻力全尺寸实验室测试中使用数字图像相关性（DIC）测量铁路道碴移动情况

IF 2 4区工程技术

Proceedings of the Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit Pub Date : 2024-03-21 DOI: 10.1177/09544097241241102

Jacob W Whittle, Stephen Danks, Iwo Słodczyk, David I Fletcher

引用次数: 0

Wheel wear prediction for high-speed trains by considering wheel-rail elastic deformation 通过考虑轮轨弹性变形预测高速列车的车轮磨损情况

IF 2 4区工程技术

Proceedings of the Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit Pub Date : 2024-03-09 DOI: 10.1177/09544097241239089

Gengzhuo Miao, Ren Luo, Huailong Shi

{"title":"Wheel wear prediction for high-speed trains by considering wheel-rail elastic deformation","authors":"Gengzhuo Miao, Ren Luo, Huailong Shi","doi":"10.1177/09544097241239089","DOIUrl":"https://doi.org/10.1177/09544097241239089","url":null,"abstract":"Wheel-rail geometric parameters are crucial for determining wheel wear in high-speed trains. Under the action of a wheel-rail load, both the wheel and rail suffer elastic deformation, which affects the wheel-rail contact relationship and further influences the wheel profile and its evolution. In this study, a field test was conducted on a high-speed train operating at 250 km/h, and the worn wheel profiles and wear curves were continuously measured for one reprofiling cycle. Subsequently, a vehicle dynamics model is built using a wheel wear prediction model based on the integrated USFD wear algorithm. In this model, the finite element model of the wheel-rail contact is considered. The wheel-rail geometric parameters are obtained by determining their elastic deformation through the finite element method, which considers the effect of three parameters: the track gauge, back-to-back space of the wheelset, and rail cant. After considering the wheel-rail elastic deformation, the track gauge decreases from 1435 to 1434.5 mm, the back-to-back space varies from 1353 to 1352.3 mm, and the rail cant changes from 1:40 to approximately 1:37. Finally, the simulation and experimental results are compared, revealing that the wheel-rail elastic deformation has a significant impact on the wheel wear after the vehicle travels 150,000 km. The wear depth and wheel-rail equivalent conicity after considering the elastic deformation are closer to the measured results.","PeriodicalId":54567,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit","volume":"3 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140127236","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

Wheel profile optimization for intercity EMUs based on the Gaussian function correction method 基于高斯函数修正法的城际动车组轮廓优化

IF 2 4区工程技术

Proceedings of the Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit Pub Date : 2024-02-27 DOI: 10.1177/09544097241229142

Maorui Hou, Yayun Qi, Changxin Chi, Peng Ao, Hua Liu

{"title":"Wheel profile optimization for intercity EMUs based on the Gaussian function correction method","authors":"Maorui Hou, Yayun Qi, Changxin Chi, Peng Ao, Hua Liu","doi":"10.1177/09544097241229142","DOIUrl":"https://doi.org/10.1177/09544097241229142","url":null,"abstract":"Intercity EMUs are prone to wheel flange wear and tread wear due to the high operating speed and many small radius curved tracks. The problems caused by wheel wear have seriously affected the safety of high-speed railway operations in China. In this paper, based on the original LMA wheel profile, the Gaussian function correction (GFC) method is proposed to design the wheel profile. The GFC method mainly changes the root region of the wheel flange, to enhance the curve passing performance and reduce wheel wear of the vehicle. The optimal profile is optimized by the Kriging surrogate model (KSM) and the whale optimization algorithm (WOA). The wheel-rail contact characteristics, dynamic characteristics and the wheel wear of the wheel profiles before and after optimization are simulated and analyzed. The results show that the equivalent conicity of the optimized profile is reduced; the critical speed is increased by 9.3 km/h, the lateral ride index and comfort index of the vehicle are further reduced. The curve passing performance is also improved, the wheel-rail wear of the optimized profile is further reduced and the maximum wear depth of the wheels before and after optimization is 43.4e-9m and 34.1e-9m on the curved track with a radius of 500m, which is reduced by 21.43%. This method provides a reference and basis for wheel profile design and profile re-profiling of intercity EMUs.","PeriodicalId":54567,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit","volume":"59 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140001973","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

Multi-modal battery-operated trains on partially electrified lines: A case study on some regional lines in Italy 部分电气化线路上的多模式电池列车：意大利部分地区线路案例研究

IF 2 4区工程技术

Proceedings of the Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit Pub Date : 2024-02-26 DOI: 10.1177/09544097241234959

Luca Pugi, Luca di Carlo

引用次数: 0

Analysis of settlement thresholds for a new ballastless track-concrete box subgrade structure 新型无砟轨道混凝土箱形路基结构的沉降临界值分析

IF 2 4区工程技术

Proceedings of the Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit Pub Date : 2024-02-19 DOI: 10.1177/09544097241234704

Zhihui Zhu, Yongjiu Tang, Weiqi Zheng, Yu Qin, Lei Yu, Xiang Wang

{"title":"Analysis of settlement thresholds for a new ballastless track-concrete box subgrade structure","authors":"Zhihui Zhu, Yongjiu Tang, Weiqi Zheng, Yu Qin, Lei Yu, Xiang Wang","doi":"10.1177/09544097241234704","DOIUrl":"https://doi.org/10.1177/09544097241234704","url":null,"abstract":"In this paper, the effects of settlement on force, track deformation, and train dynamics to determine the settlement thresholds of ballastless track-concrete box subgrade (BTCBS) are studied. Firstly, this study introduces four settlement types, namely V-shape, box rolling, box faulting, and trapezoid settlement. The nonlinear finite element model (FEM) of BTCBS and the train-ballastless track-concrete box subgrade (TBTCBS) model considering nonlinear contact between track slabs and base slabs are established. Then, the effects of settlement on fastener force, track deformation, and vehicle dynamics are studied. According to the calculated results and China’s codes, the settlement limit values of BTCBS can be obtained. The results indicate that the settlement thresholds with box rolling and faulting are controlled by vertical force of fasteners, and the settlement limit values with V-shape and trapezoid settlement are controlled by 10 m chord versine of vertical irregularity (CVVI). The suggested settlement limit values of BTCBS for box faulting, box rolling, trapezoid, and V-shape settlement are respectively 2.48 mm, 2.55 mm, 17.43 mm, and 8.79 mm.","PeriodicalId":54567,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit","volume":"48 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139949653","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