发布求助
文献互助 智能选刊 最新文献

Acta Polytechnica CTU Proceedings最新文献

筛选
英文 中文
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":"28 1","pages":""},"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
Integrated cyclic timetable on the railways in the Karlovy Vary region 卡罗维发利地区铁路综合循环时刻表
Acta Polytechnica CTU Proceedings Pub Date : 2023-11-22 DOI: 10.14311/app.2023.43.0028
Jakub Hora, Filip Baran
{"title":"Integrated cyclic timetable on the railways in the Karlovy Vary region","authors":"Jakub Hora, Filip Baran","doi":"10.14311/app.2023.43.0028","DOIUrl":"https://doi.org/10.14311/app.2023.43.0028","url":null,"abstract":"The concept of public transport with periodic timetables has been slowly spreading in the Czech Republic for many years. Together with the announcement of tenders for the operation of compulsory transport according to the European Parliament’s Regulations 1370/2007 and 2338/2016, circular integrations occur in many regions, which usually represent the adjustment of public transport to a concept corresponding to current trends and needs.","PeriodicalId":503914,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139247325","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
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
{"title":"Expert questionnaire on the issue of economical use of the railway traffic path capacity and buildings preparation on the railway","authors":"Pavel Purkart, David Vodák","doi":"10.14311/app.2023.43.0086","DOIUrl":"https://doi.org/10.14311/app.2023.43.0086","url":null,"abstract":"The railway traffic path capacity and the issue of railway buildings planning are topics that are widely discussed in professional groups. Experts often do not the same opinions on these topics. The issue of the allocation of railway traffic path capacity is given in general legislation and further by regulations or directives of a particular railway operator. Carriers are obliged to agree to these conditions. In the case of railway buildings planning, there are also comprehensive defined procedures and selected methods and models which are used to evaluate buildings planning (for example, a four-stage transport model or a logit model). However, it is appropriate to deal with the idea of whether all these procedures are correct and whether it is not appropriate to make changes, especially in the long-established procedures, that would better reflect the current and future reality and society needs.","PeriodicalId":503914,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":"64 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139247856","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
{"title":"Recycled materials for sublayers","authors":"Richard Svoboda, Dana Hubáčková, Jan Valehrach","doi":"10.14311/app.2023.43.0111","DOIUrl":"https://doi.org/10.14311/app.2023.43.0111","url":null,"abstract":"The article focuses on the recycled materials used in sleeper substructure. In the introduction, it summarizes the requirements for bearing layers of railway substructure and recycling of waste construction materials. The article presents the materials on which laboratory tests have been carried out and discusses in detail the most perspective – recycled concrete. For concrete recyclate, the article describes the results of laboratory tests – sieve analysis, determination of optimum moisture, and determination of bearing capacity using California bearing ratio, Immediate bearing index and Static deformation modulus.","PeriodicalId":503914,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":"299 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139250276","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
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":"53 1","pages":""},"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
{"title":"Modern vehicles for regional railways","authors":"Josef Kolář","doi":"10.14311/app.2023.43.0062","DOIUrl":"https://doi.org/10.14311/app.2023.43.0062","url":null,"abstract":"The paper analyses the history of two-axle rail vehicles (rail buses) used for operation on regional lines in Czechoslovakia. It also shows trends in the development of modern light autonomous rolling stocks usable for passenger transport on unprofitable regional lines in Western Europe. The measures adopted in the transport policy of the Czech Republic for the period 2021–2027 for regional railway vehicles in the Czech Republic are presented. The final part of the paper presents the results of study of the concepts of a two-axle hybrid and electric rail buses and a conceptual design of a modular solution of a partially low-floor vehicle BEMU and HEMU for passenger regional rail transport. This paper shows that it is very problematic to create a light rail vehicle (LVR) that will be economical and environmentally friendly for regional transport and at the same time will meet the requirements of standards ČSN EN 12 663, category P2 and ČSN EN 15 227, category C I and will be friendly to road users.","PeriodicalId":503914,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":"96 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139250112","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
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
{"title":"Cooperation of active steering control of wheelsets with subsystems of an autonomous urban rail vehicle","authors":"Jan Vrba","doi":"10.14311/app.2023.43.0117","DOIUrl":"https://doi.org/10.14311/app.2023.43.0117","url":null,"abstract":"The paper presents the motivations for the application of actively controlled elements in the running gear of a rail vehicle and the challenges that need to be addressed before deploying vehicles with actively controlled elements in real operation. Furthermore, the paper presents the design of an active element concept and its control for steering the axles of an urban rail vehicle to improve the vehicle’s passage through small radius curves. The design takes into account the fundamental issues of cost and safety of the application of active elements, which are addressed in the presented control design by using data from autonomous driving subsystems such as the environmental database or the anti-collision system.","PeriodicalId":503914,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":"5 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139247808","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
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
{"title":"MUPIF WORKFLOW EDITOR AND AUTOMATIC CODE GENERATOR","authors":"S. Šulc, V. Šmilauer, B. Patzák","doi":"10.14311/app.2020.26.0107","DOIUrl":"https://doi.org/10.14311/app.2020.26.0107","url":null,"abstract":"Integrating applications or codes into MuPIF API Model enables easy integration of such APIs into any workflow representing complex multiphysical simulation. This concept of MuPIF also enables automatic code generation of the computational code for given workflow structure. This article describes a ’workflow generator’ tool for the code generation together with ’workflow editor’ graphical interface for interactive definition of the workflow structure and the inner data dependencies. The usage is explained on a thermo-mechanical simulation.","PeriodicalId":503914,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":" 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141222475","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
首页 上一页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信