Pub Date : 1989-04-25DOI: 10.1109/RRCON.1989.77288
D. Jovanovic'c, P. Harker
The authors present an overview of a decision-support model for the tactical scheduling of railroad traffic which is meant to support the medium-term issues facing a railroad. This initial version of the schedule analysis (SCAN) system is based on notions from both simulation and combinatorial optimization, and is designed to provide schedulers with a tool for scheduling which provides real-time response. After describing the conceptual and algorithmic underpinnings of the SCAN system and its associated user interface, the authors use examples taken from a major railroad to illustrate the capabilities and limitations of the current system. Preliminary results from the use of this system at a major railroad are also discussed.<>
{"title":"SCAN: a decision support system for railroad scheduling","authors":"D. Jovanovic'c, P. Harker","doi":"10.1109/RRCON.1989.77288","DOIUrl":"https://doi.org/10.1109/RRCON.1989.77288","url":null,"abstract":"The authors present an overview of a decision-support model for the tactical scheduling of railroad traffic which is meant to support the medium-term issues facing a railroad. This initial version of the schedule analysis (SCAN) system is based on notions from both simulation and combinatorial optimization, and is designed to provide schedulers with a tool for scheduling which provides real-time response. After describing the conceptual and algorithmic underpinnings of the SCAN system and its associated user interface, the authors use examples taken from a major railroad to illustrate the capabilities and limitations of the current system. Preliminary results from the use of this system at a major railroad are also discussed.<<ETX>>","PeriodicalId":339427,"journal":{"name":"Proceedings., Technical Papers Presented at the IEEE/ASME Joint Railroad Conference","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121086697","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}
Pub Date : 1989-04-25DOI: 10.1109/RRCON.1989.77277
W. Harprecht, R. Seifert, F. Kiessling
A short review is given of the overhead catenary system used for several high-speed lines and of novel high-performance pantographs. The characteristic data of the trial section are described. Upgrading of the catenary and using a novel pantograph enabled record speed on rails (406.9 km/h) to be attained. Advanced measuring devices were used to supervise the run of the pantograph and the behavior of the catenary. The monitored data proved that the tractive power was reliably transmitted to the vehicle even at the peak speed. The design speed of the catenary was 250 km/h. Tests carried out under the catenary and the high-speed runs demonstrated the effectiveness of the design. They proved that in regular service, speeds up to 300 km/h will not cause any reductions of the quality of contact between the pantograph and the overhead catenary. The topography of the trial section, the limited superelevation of the rail, and the power capacity of the train determined the achieved speed. The catenary would have been suitable for a further increase in speed.<>
{"title":"Tractive power supply at German Federal Railway's 400 km/h runs","authors":"W. Harprecht, R. Seifert, F. Kiessling","doi":"10.1109/RRCON.1989.77277","DOIUrl":"https://doi.org/10.1109/RRCON.1989.77277","url":null,"abstract":"A short review is given of the overhead catenary system used for several high-speed lines and of novel high-performance pantographs. The characteristic data of the trial section are described. Upgrading of the catenary and using a novel pantograph enabled record speed on rails (406.9 km/h) to be attained. Advanced measuring devices were used to supervise the run of the pantograph and the behavior of the catenary. The monitored data proved that the tractive power was reliably transmitted to the vehicle even at the peak speed. The design speed of the catenary was 250 km/h. Tests carried out under the catenary and the high-speed runs demonstrated the effectiveness of the design. They proved that in regular service, speeds up to 300 km/h will not cause any reductions of the quality of contact between the pantograph and the overhead catenary. The topography of the trial section, the limited superelevation of the rail, and the power capacity of the train determined the achieved speed. The catenary would have been suitable for a further increase in speed.<<ETX>>","PeriodicalId":339427,"journal":{"name":"Proceedings., Technical Papers Presented at the IEEE/ASME Joint Railroad Conference","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122011515","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}
Pub Date : 1989-04-25DOI: 10.1109/RRCON.1989.77280
D. Fishman
Three applications of onboard locomotive computers are explored: advanced train control systems (ATCS); data management; and train handling and maintenance. Economic benefits of retrofitting the railroads' current fleet of locomotives with onboard computers are examined, as are implications for how the industry makes decisions about such technology. The economic justification for onboard computers is discussed in connection with balancing the costs of implementation against the resulting benefits such as enhanced safety, increased productivity and equipment utilization, improved customer service, and savings on fuel, maintenance, and clerical expenses.<>
{"title":"Applications and economic justification for on-board locomotive computers","authors":"D. Fishman","doi":"10.1109/RRCON.1989.77280","DOIUrl":"https://doi.org/10.1109/RRCON.1989.77280","url":null,"abstract":"Three applications of onboard locomotive computers are explored: advanced train control systems (ATCS); data management; and train handling and maintenance. Economic benefits of retrofitting the railroads' current fleet of locomotives with onboard computers are examined, as are implications for how the industry makes decisions about such technology. The economic justification for onboard computers is discussed in connection with balancing the costs of implementation against the resulting benefits such as enhanced safety, increased productivity and equipment utilization, improved customer service, and savings on fuel, maintenance, and clerical expenses.<<ETX>>","PeriodicalId":339427,"journal":{"name":"Proceedings., Technical Papers Presented at the IEEE/ASME Joint Railroad Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122240999","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}
Pub Date : 1989-04-25DOI: 10.1109/RRCON.1989.77279
F. Blader, J. Elkins, N. Wilson, P. Klauser
NUCARS (New and Untried Car Analytic Regime Simulation) is a general-purpose program for modeling rail vehicle transient and steady-state response. NUCARS models the interaction of an arbitrary number of rigid or flexible bodies joined by suspension-element-type connections. Means are provided for varying the number and identity of the degrees of freedom chosen for each body. The potential choices include all translational and rotational body degrees of freedom and the first flexible modes (for all bodies, excluding the wheelsets) in twist and in vertical and lateral bending. All connections must be assigned a stiffness and/or damping characteristic. Rigid connections are given large stiffnesses. The representation of connection location and of forces through the connections is chosen to minimize the program memory required. NUCARS is coded in Fortran 77 for use on IBM-compatible personal computers. Three vehicle dynamics applications are presented, including results of validation testing with a lightweight, two-axle, intermodal car.<>
NUCARS (New and untry Car analytical Regime Simulation)是一个用于轨道车辆瞬态和稳态响应建模的通用程序。NUCARS对任意数量的刚体或柔体的相互作用进行建模，这些刚体或柔体通过悬架单元型连接连接在一起。提供了用于改变为每个物体所选择的自由度的数目和同一性的方法。潜在的选择包括所有平移和旋转车身自由度以及扭转、垂直和横向弯曲的第一柔性模式(适用于所有车身，轮对除外)。所有连接必须指定刚度和/或阻尼特性。刚性连接具有较大的刚度。连接位置的表示和通过连接的力的选择是为了最小化所需的程序内存。NUCARS是用Fortran 77编码的，用于ibm兼容的个人计算机。介绍了三种车辆动力学应用，包括一辆轻型双轴多式联运汽车的验证测试结果
{"title":"Development and validation of a general vehicle dynamics simulation (NUCARS)","authors":"F. Blader, J. Elkins, N. Wilson, P. Klauser","doi":"10.1109/RRCON.1989.77279","DOIUrl":"https://doi.org/10.1109/RRCON.1989.77279","url":null,"abstract":"NUCARS (New and Untried Car Analytic Regime Simulation) is a general-purpose program for modeling rail vehicle transient and steady-state response. NUCARS models the interaction of an arbitrary number of rigid or flexible bodies joined by suspension-element-type connections. Means are provided for varying the number and identity of the degrees of freedom chosen for each body. The potential choices include all translational and rotational body degrees of freedom and the first flexible modes (for all bodies, excluding the wheelsets) in twist and in vertical and lateral bending. All connections must be assigned a stiffness and/or damping characteristic. Rigid connections are given large stiffnesses. The representation of connection location and of forces through the connections is chosen to minimize the program memory required. NUCARS is coded in Fortran 77 for use on IBM-compatible personal computers. Three vehicle dynamics applications are presented, including results of validation testing with a lightweight, two-axle, intermodal car.<<ETX>>","PeriodicalId":339427,"journal":{"name":"Proceedings., Technical Papers Presented at the IEEE/ASME Joint Railroad Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126005121","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}
Pub Date : 1989-04-25DOI: 10.1109/RRCON.1989.77281
R. Hill, D. Carpenter, T. Tasar
A railway track acts as a pair of leaky ground-return conductors for propulsion current in the immediate vicinity of trains and as an imperfectly insulated conductor pair for double-rail track circuits. The authors consider the effect of ground admittance and leakage conditions from both the traction and signaling viewpoints. Problems concerning rail voltage safety level, earth leakage currents, and rail current distribution are examined. Capacitive compensation is evaluated as a means of improving the shunting sensitivity of track circuits with high ballast conductivity.<>
{"title":"Railway track admittance, earth-leakage effects and track circuit operation","authors":"R. Hill, D. Carpenter, T. Tasar","doi":"10.1109/RRCON.1989.77281","DOIUrl":"https://doi.org/10.1109/RRCON.1989.77281","url":null,"abstract":"A railway track acts as a pair of leaky ground-return conductors for propulsion current in the immediate vicinity of trains and as an imperfectly insulated conductor pair for double-rail track circuits. The authors consider the effect of ground admittance and leakage conditions from both the traction and signaling viewpoints. Problems concerning rail voltage safety level, earth leakage currents, and rail current distribution are examined. Capacitive compensation is evaluated as a means of improving the shunting sensitivity of track circuits with high ballast conductivity.<<ETX>>","PeriodicalId":339427,"journal":{"name":"Proceedings., Technical Papers Presented at the IEEE/ASME Joint Railroad Conference","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132577119","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：