Proceedings of the 1999 ASME/IEEE Joint Railroad Conference (Cat. No.99CH36340)最新文献

New masters courses in Electric Railway Engineering 电气铁路工程新硕士课程

Proceedings of the 1999 ASME/IEEE Joint Railroad Conference (Cat. No.99CH36340) Pub Date : 1999-04-15 DOI: 10.1109/RRCON.1999.762410

R. Hill

引用次数: 0

Measurement of air flow past freight trains through long tunnels 货运列车通过长隧道时气流的测量

Proceedings of the 1999 ASME/IEEE Joint Railroad Conference (Cat. No.99CH36340) Pub Date : 1999-04-15 DOI: 10.1109/RRCON.1999.762409

J.A. Karloff, R. Arnold, W.N. Weins, M. Iden, D. K. Petersen

{"title":"Measurement of air flow past freight trains through long tunnels","authors":"J.A. Karloff, R. Arnold, W.N. Weins, M. Iden, D. K. Petersen","doi":"10.1109/RRCON.1999.762409","DOIUrl":"https://doi.org/10.1109/RRCON.1999.762409","url":null,"abstract":"The operation of heavily loaded diesel locomotives in long tunnels is a problem due to the inability to provide adequate air flow into the annulus between the train and tunnel walls. The existing solutions are expensive, sometimes ineffective and prone to damage. To understand the dynamics of the air flow in a 2 mile long tunnel, measurements were taken of the flow ahead and behind the train and in the annulus between the train and tunnel walls. Air flow measurements were taken from a cross section at each end of the tunnel 50 feet in from the portals. Air flow instruments were mounted on a swing arm on the tunnel wall to record data while the train was in the tunnel. Flow, temperature and flow direction were measured near the tunnel wall to measure the annulus air properties as the train passed the instrumentation. Results from these tests show that for freight trains the annulus air flow in the direction opposite the train is small, resulting in little flow of fresh air past the locomotive. For more aerodynamic trains such as a passenger train there is a definite annulus air flow that is opposite the train direction. The flow pattern ahead of the train is a well developed parabolic pattern whereas the flow behind the train is essentially uniform across the cross section of the tunnel. The momentum of the air after the train exits the tunnel and the natural draft of the air through the tunnel greatly affect the speed at which the exhaust gases are purged from the tunnel. These data are being used to develop a model to predict air flow patterns in a tunnel.","PeriodicalId":233147,"journal":{"name":"Proceedings of the 1999 ASME/IEEE Joint Railroad Conference (Cat. No.99CH36340)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115435897","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: 1

Corrosion control for the Dallas Area Rapid Transit system 达拉斯地区快速交通系统的腐蚀控制

Proceedings of the 1999 ASME/IEEE Joint Railroad Conference (Cat. No.99CH36340) Pub Date : 1999-04-15 DOI: 10.1109/RRCON.1999.762399

E. D. Kale, M. Sanders, W. Sidoriak

{"title":"Corrosion control for the Dallas Area Rapid Transit system","authors":"E. D. Kale, M. Sanders, W. Sidoriak","doi":"10.1109/RRCON.1999.762399","DOIUrl":"https://doi.org/10.1109/RRCON.1999.762399","url":null,"abstract":"The Dallas Light Rail Transit System (DART) operates it's traction power system at 800 volt direct current (DC). Several generations have passed since electrified transit operated in Dallas, the possible dynamic effects of stray current have not been realized by local utility companies. Stray current corrosion is caused by an earth path of direct current from a source external to an underground metallic structure. DART, like most modern transit systems, incorporates corrosion control measures to insure that the DC traction return current travels along the running rails and does not generate stray current interference on surrounding metallic structures. Other routine corrosion control methods must also be addressed such as galvanic corrosion on metallic structures, which results from electro-chemical reactions. This is mitigated by barriers, which prevent a chemical reaction from taking place on the structure. Another method of controlling corrosion is the use of cathodic protection, where sacrificial anodes are installed to afford protective currents to mitigate the corrosive effects on a buried metallic structure. DART is active in coordinating corrosion control methods with other utilities that own and operate underground structures subject to corrosion damages. This paper explains the interaction of the traction power, signal, and corrosion control disciplines and methods used for the effective control of corrosion. The interaction of these disciplines, and coordination with local owners of buried metallic structures will keep corrosion under control and maintain a high level of engineered protection.","PeriodicalId":233147,"journal":{"name":"Proceedings of the 1999 ASME/IEEE Joint Railroad Conference (Cat. No.99CH36340)","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134525388","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: 3

Design of grounding systems for Tri-Met Portland Westside light rail traction power substations 波特兰西区轻轨牵引变电站接地系统设计

Proceedings of the 1999 ASME/IEEE Joint Railroad Conference (Cat. No.99CH36340) Pub Date : 1999-04-15 DOI: 10.1109/RRCON.1999.762404

R. S. Thomas, K. Pham

引用次数: 9

Distortion and power factor of nonlinear loads 非线性负载的畸变和功率因数

Proceedings of the 1999 ASME/IEEE Joint Railroad Conference (Cat. No.99CH36340) Pub Date : 1999-04-15 DOI: 10.1109/RRCON.1999.762403

T. Kneschke

{"title":"Distortion and power factor of nonlinear loads","authors":"T. Kneschke","doi":"10.1109/RRCON.1999.762403","DOIUrl":"https://doi.org/10.1109/RRCON.1999.762403","url":null,"abstract":"When large nonlinear loads, in the order of tens of megawatts, are connected to utility systems, significant harmonic voltages and currents are produced. These loads include static frequency converters serving 25 Hz and 16 2/3 Hz intercity and commuter rail systems. The converter harmonics cause increased heating of the utility and other customer equipment and can lead to system resonance. Therefore, the harmonics need to be taken into account in various system evaluations. The difficulties in dealing with nonlinear loads encountered by the author include the following: calculation of the harmonic distortion; and calculation of power factor. The IEEE method of harmonic distortion calculation is compared with an alternative method proposed in technical literature. The alternative method resolves the intuitive difficulty of visualizing harmonic distortion of over 100% when one or more of the frequencies in the harmonic spectrum is higher than the fundamental frequency, but introduces other difficulties, such as understating the magnitude of distortion. The complexity of determination of power factor for distorted voltage and current increases as more harmonics are included in the calculation. Due to distorted waveforms, the true power factor is always lower than the power factor calculated when, as often is the case, the harmonics are ignored. In this paper the concepts of nonlinear load and harmonics are reviewed first. Subsequently, calculation of the harmonic distortion and power factor are discussed in mathematical terms and supplemented with practical examples.","PeriodicalId":233147,"journal":{"name":"Proceedings of the 1999 ASME/IEEE Joint Railroad Conference (Cat. No.99CH36340)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124962512","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: 18

Field demonstrations of two prototype high-speed tribometers 两台高速摩擦计样机的现场演示

Proceedings of the 1999 ASME/IEEE Joint Railroad Conference (Cat. No.99CH36340) Pub Date : 1999-04-15 DOI: 10.1109/RRCON.1999.762418

R. Reiff, J. Cooke

引用次数: 0

Development of a passenger rail vehicle crush zone 客运轨道车辆挤压区研制

Proceedings of the 1999 ASME/IEEE Joint Railroad Conference (Cat. No.99CH36340) Pub Date : 1999-04-13 DOI: 10.1109/RRCON.1999.762408

Ronald Mafllle, R. Stringfellow, R. Rancatore, Little

引用次数: 9

Software-how do we know it is safe? 软件——我们怎么知道它是安全的?

Proceedings of the 1999 ASME/IEEE Joint Railroad Conference (Cat. No.99CH36340) Pub Date : 1999-04-13 DOI: 10.1109/RRCON.1999.762411

I. B. Pirie

引用次数: 3

Filtering effects of mid-cord offset measurements on track geometry data 中线偏置测量对轨道几何数据的滤波效应

Proceedings of the 1999 ASME/IEEE Joint Railroad Conference (Cat. No.99CH36340) Pub Date : 1999-04-13 DOI: 10.1109/RRCON.1999.762415

M. Ahmadian

引用次数: 8

An experimental evaluation of the effect of rail vehicles truck suspensions on wheel-rail forces 轨道车辆悬架对轮轨力影响的实验研究

Proceedings of the 1999 ASME/IEEE Joint Railroad Conference (Cat. No.99CH36340) Pub Date : 1999-04-13 DOI: 10.1109/RRCON.1999.762413

M. Ahmadian, D. White

引用次数: 0