Acta Polytechnica CTU Proceedings最新文献_第2页

Expert questionnaire on the issue of economical use of the railway traffic path capacity and buildings preparation on the railway 关于节约使用铁路运输通道能力和铁路建筑准备问题的专家调查问卷

Acta Polytechnica CTU Proceedings Pub Date : 2023-11-22 DOI: 10.14311/app.2023.43.0086

Pavel Purkart, David Vodák

引用次数: 0

The measurement of the influence of the adhesion loss on the dynamic load of the drive reaction rod on the roller rig 测量附着力损失对滚筒钻机驱动反作用力杆动载荷的影响

Acta Polytechnica CTU Proceedings Pub Date : 2023-11-22 DOI: 10.14311/app.2023.43.0006

Vojtěch Dybala

{"title":"The measurement of the influence of the adhesion loss on the dynamic load of the drive reaction rod on the roller rig","authors":"Vojtěch Dybala","doi":"10.14311/app.2023.43.0006","DOIUrl":"https://doi.org/10.14311/app.2023.43.0006","url":null,"abstract":"The dynamic behaviour and dynamic phenomena in traction drives of railway vehicle has been studied for decades. Generally, in these days the motivation for this research is to look for answers related with service problems, which has been risen, e.g. an overloading of mechanical components as wheelsets or an intention to improve control systems of traction drives of railway vehicles. This problematic has also motivated the research at the Faculty of Mechanical Engineering at the Czech Technical University (CTU) in Prague. Nowadays it is also usual, that the main research tool has been a simulation based on a mathematical model of a railway vehicle or its specific components, as testing on real vehicles is very demanding regarding costs. However, there is an alternative – a roller rig. At the CTU in Prague there has been modernized the second roller rig for purposes of measurement regarding the torsion dynamics research, to support PhD students for their theses and possibly to extend the education for students oriented on the railway vehicle’s design. This contribution brings results of measurements just from the problematics of torsion oscillations and dynamics. Specifically, further presented measurements are on the loss of the adhesion in the contact of the wheelset and rollers, as the substitution for the railway, its impact on the reaction rod overloading and study of the axle load influence on the transition phenomena.","PeriodicalId":503914,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139250432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ecological solutions for freight trains 货运列车的生态解决方案

Acta Polytechnica CTU Proceedings Pub Date : 2023-11-22 DOI: 10.14311/app.2023.43.0045

Martin Chýle, Michal Drábek

{"title":"Ecological solutions for freight trains","authors":"Martin Chýle, Michal Drábek","doi":"10.14311/app.2023.43.0045","DOIUrl":"https://doi.org/10.14311/app.2023.43.0045","url":null,"abstract":"The article presents the potential of freight railway transport in terms of saving of emissions and maximizing the efficiency of operation. Attention is paid to the transport of freight trains on electrified lines with higher gradients (up to 25‰), alternatively with the possibility of a trip to non-electrified lines and sidings, which generate significant extra costs in the operation of trains and are often a reason for the carrier to deploy a locomotive of independent traction (diesel-electric) even in electrified line sections, even at the cost of increased operating costs and increased emissions. There are many such lines and possibilities of use within the Central European region and the Czech Republic.In the first part of the article, the basic categorisation of dual-mode freight locomotives and their suitability for individual operating programmes is presented. This part also describes current situation on the rolling stock market in general and directions of development taken by various locomotive manufacturers.Case studies of deployment of real freight locomotives on chosen Czech railway lines are used in the next part to present the possibilities for energy and cost savings when replacing a vehicle with independent traction by an electric or dual-mode locomotive, at least in sections equipped with overhead catenary. The pros and cons of using several possible solutions are described in detail. Further considerable savings can be achieved by, among other things, using regenerative braking and returning the generated electricity back to the catenary system when driving downhill. In this respect, however, it is also necessary to cooperate with the infrastructure manager, who must also adapt the railway lines to the operation of these vehicles.Finally, general rules for operational deployments on which the replacement of a conventional vehicle by a dual or pure electric vehicle can be considered are formulated.","PeriodicalId":503914,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139250562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recycled materials for sublayers 用于底层材料的再生材料

Acta Polytechnica CTU Proceedings Pub Date : 2023-11-22 DOI: 10.14311/app.2023.43.0111

Richard Svoboda, Dana Hubáčková, Jan Valehrach

引用次数: 0

The influence of the construction of tram fronts on the consequences of accidents with passenger cars 有轨电车车头结构对客车事故后果的影响

Acta Polytechnica CTU Proceedings Pub Date : 2023-11-22 DOI: 10.14311/app.2023.43.0093

Jakub Seidl

{"title":"The influence of the construction of tram fronts on the consequences of accidents with passenger cars","authors":"Jakub Seidl","doi":"10.14311/app.2023.43.0093","DOIUrl":"https://doi.org/10.14311/app.2023.43.0093","url":null,"abstract":"In recent years, there has been a large increase in passenger and public transport in cities. An increase in traffic flow results in an increasing risk of accidents. Manufacturers and operators of trams are increasingly subject to higher requirements for ensuring the safety of vehicles. Vehicle safety can be divided into two groups: active and passive safety. Systems and elements of active safety are intended to reduce the risk of accidents. Systems and elements of passive safety are intended to minimize the consequences of accidents. The requirements for the passive safety of newly designed railway vehicles are described in standard EN 15227. Standard EN 15227 was created due to the effort to protect passengers and crew inside railway vehicles in the event of an accident, so it is a so-called self-protection. The standard EN 15227 does not stipulate any requirements for so-called partner protection. Partner protection means an approach in which the vehicle protects passengers inside and outside the vehicle with its deformation elements.This article deals with the issue of how the construction of the front of tram vehicles designed according to the requirements of the standard EN 15227 will affect the consequences of tram´s accidents with passenger cars. The first part of the article describes the requirements of the standard EN 15227 for newly designed trams. Than it describes the creation and evaluation of tram accident statistics in the Czech Republic for the years 2016 to 2018 with regard to the types of collision vehicles, collision directions and consequences of accidents. From the results of the evaluation of the accident statistics, a collision scenario was determined, in which the passengers inside cars were most often injured. The last part of the article is devoted to the creation of simulation models of accidents of three trams with a car and evaluation of simulation calculations with regard to the risk of injury to car´s driver in an accident with trams using human biomechanical criteria.","PeriodicalId":503914,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139249735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modern vehicles for regional railways 地区铁路的现代化车辆

Acta Polytechnica CTU Proceedings Pub Date : 2023-11-22 DOI: 10.14311/app.2023.43.0062

Josef Kolář

引用次数: 0

Cooperation of active steering control of wheelsets with subsystems of an autonomous urban rail vehicle 轮组主动转向控制与自动驾驶城市轨道交通车辆子系统的合作

Acta Polytechnica CTU Proceedings Pub Date : 2023-11-22 DOI: 10.14311/app.2023.43.0117

Jan Vrba

引用次数: 0

MUPIF WORKFLOW EDITOR AND AUTOMATIC CODE GENERATOR mupif 工作流程编辑器和自动代码生成器

Acta Polytechnica CTU Proceedings Pub Date : 2020-03-17 DOI: 10.14311/app.2020.26.0107

S. Šulc, V. Šmilauer, B. Patzák

引用次数: 0