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Problems,assumptions and solutions in locomotive design,traction and operational studies

Railway Engineering Science 2022年第3期30卷 265-288页

作者： Maksym Spiryagin Qing Wu Oldrich Polach John Thorburn Wenhsi Chua Valentyn Spiryagin Sebastian Stichel Sundar Shrestha Esteban Bernal Sanjar Ahmad Colin Cole Tim McSweeney Centre for Railway Engineering Central Queensland UniversityRockhampton 4702Australia Independent Consultant Neuhausen am RheinfallSwitzerland Progress Rail NewcastleAustralia BHP Port HedlandAustralia Engineering Centre for Railway Transport SkolkovoRussian Federation KTH Royal Institute of Technology StockholmSweden

locomotive design is a highly complex task that requires the use of systems engineering that depends upon knowledge from a range of disciplines and is strongly oriented on how to design and manage complex systems that operate under a wide range of different train operational conditions on various types of *** that field investigation programs for locomotive operational scenarios involve high costs and cause disruption of train operations on real railway networks and given recent developments in the rollingstock compliance standards in Australia and overseas that allow the assessment of some aspects of rail vehicle behaviour through computer simulations,a great number of multidisciplinary research studies have been performed and these can contribute to further improvement of a locomotive design technique by increasing the amount of computer-based *** paper was focused on the presentation of the all-important key components required for locomotive studies,starting from developing a realistic locomotive design model,its validation and further applications for train *** integration of all engineering disciplines is achieved by means of advanced simulation approaches that can incorporate existing AC and DC locomotive designs,hybrid locomotive designs,full locomotive traction system models,rail friction processes,the application of simplified and exact wheel-rail contact theories,wheel-rail wear and rolling contact fatigue,train dynamic behaviour and intrain forces,comprehensive track infrastructure details,and the use of co-simulation and parallel *** cosimulation and parallel computing approaches that have been implemented on Central Queensland University’s High-Performance Computing cluster for locomotive studies will be *** confidence in these approaches is based on specific validation procedures that include a locomotive model acceptance procedure and field test *** problems and limitations presented in locomot

关键词： locomotive Design Simulation Virtual prototyping Digital twin Traction Braking Wheel-rail wear Damage

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A multi-objective train-scheduling optimization model considering locomotive assignment and segment emission constraints for energy saving

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Journal of Modern Transportation 2013年第1期21卷 9-16页

作者： Hui Hu Keping Li Xiaoming Xu State Key Laboratory of Rail Traffic Control Beijing Jiaotong University School of Economics and Management East China Jiaotong University

Energy saving and emission reduction for railway systems should not only be studied from a technical perspective but should also be focused on management and economics. On the basis of relevant trainscheduling models for train operation management, in this paper we introduce an extended multi-objective trainscheduling optimization model considering locomotive assignment and segment emission constraints for energy saving. The objective of setting up this model is to reduce the energy and emission cost as well as total passenger- time. The decision variables include continuous variables such as train arrival and departure time, and binary vari- ables such as locomotive assignment and segment occu- pancy. The constraints are concerned with train movement, trip time, headway, and segment emission, etc. To obtain a non-dominated satisfactory solution on these objectives, a fuzzy multi-objective optimization algorithm is employed to solve the model. Finally, a numerical example is performed and used to compare the proposed model with the existing model. The results show that the proposed model can reduce the energy consumption, meet exhausts emission demands effectively by optimal locomotive assignment, and its solution methodology is effective.

关键词： Energy saving Emission reduction Trair KeywordSscheduling Multi-objective optimization locomotive assignment

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Dynamic performance of six-axle locomotive subjected to asymmetric brake shoe forces

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Journal of Central South University 2020年第9期27卷 2776-2791页

作者： LIU Peng-fei ZHANG Kai-long CAO Yun-qiang State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China

To research the influence of asymmetric brake shoe forces(ABSF)induced by braking failure on the dynamic performance of six-axle locomotive,the static equilibrium model of three-axle bogie and dynamic model for locomotive are *** coupling vibration equations of axle hung motor and wheelset are *** the air braking,the influence mechanism of ABSF on the wheel-rail asymmetric motion and force characteristics are *** can be found that if the ABSF is applied in the front wheelset,all the wheelsets move laterally in the same *** the ABSF occurs in the middle or rear one,other wheelsets may move laterally towards the opposite *** motion amplitude and direction of all wheelsets strictly depend on the resultant moment of suspension yawing moment and brake shoe asymmetric *** the asymmetric braking,the free lateral gap of axle-box could increase the wheelset motion amplitude,but could not change the moving *** both the straight line and curve,the ABSF may lead to wheelset misaligning motion,intensify the wheel-rail lateral dynamic interaction and deteriorate wheel-rail contact *** for the steering wheelsets,the asymmetric braking increases the wheelset attack angle significantly,which forms the worst braking condition.

关键词： locomotive brake shoe force dynamic performance asymmetric braking wheel-rail contact

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Formation process,key influencing factors,and countermeasures of high-order polygonal wear of locomotive wheels

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2021年第1期22卷 70-84页

作者： Gong-quan TAO Xiao-long LIU Ze-feng WEN Xue-song JIN State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China

Two types of high power alternating current(AC) locomotive in China are prone to serious high-order polygonal wear, which has significant negative effects on the operation of locomotives. This study investigates factors influencing polygonal wear in locomotive wheels and determines methods of minimizing operation damage. We designed experiments to analyze the process of polygonization formation of wheels to identify the key influencing factors, finding that natural vibration of wheelsets is the central inherent factor of wheel polygonization and that these vibrations can be easily stimulated by wheel or rail irregularities. We found that poor re-profiling quality is the key external factor in these irregularities. The wheelset bending resonance is activated when the remaining wheel polygonal wear has a wavelength of 200 mm in the 1/3 octave band, in turn leading to significant increases of wheel polygonal wear. In this study, we review a new wheelset design that can mitigate and/or eliminate the polygonal wheel wear due to increased stiffness in wheel bending. We evaluate the potential capacity of the newly designed wheelset and propose two proven effective measures to further improve the wheel re-profiling quality for polygonal wear.

关键词： locomotive Polygonal wear Wheelset dynamic analysis Wheel re-profiling

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Air Compressor Control System for Energy Saving in locomotive Service Plant

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Journal of Electromagnetic Analysis and Applications 2009年第2期1卷 114-117页

作者： Wenyu Mo 不详

The actuality and disadvantages of traditional high power asynchronism motor drive air compressor in locomotive ser-vice plant are discussed. In order to reduce the energy consumption and obtain safe running, a variable frequency con-trol method to the motor is supplied. A PLC with touch screen is used for monitoring the status of the compressor and its control system. It also presents energy consumption analysis caused by the variable frequency control method in a locomotive service plant.

关键词： Variable Frequency Air Compressor locomotive Service Plant

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Utility of “loco-check,” self-checklist for “locomotive syndrome” as a tool for estimating the physical dysfunction of elderly people

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Health 2013年第12期5卷 97-102页

作者： Yasumoto Matsui Marie Takemura Atsushi Harada Fujiko Ando Hiroshi Shimokata Department for Development of Preventive Medicine Center for Development of Advanced Medicine for Dementia National Center for Geriatrics and Gerontology Obu Japan Department of Health and Medical Sciences Aichi Shukutoku University Nagakute Japan Department for Development of Preventive Medicine Center for Development of Advanced Medicine for Dementia National Center Department of Health and Medical Sciences Aichi Shukutoku University Nagakute Japan Department of Orthopedic Surgery National Center for Geriatrics and Gerontology Obu Japan

Aim: A new concept of locomotive syndrome has been proposed by the Japanese Orthopaedic Association. The aim of this study is to clarify the utility of its self-checklist, “loco-check,” as a tool for estimating the physical dysfunction of elderly people. Methods: Subjects were 1124 community-dwelling Japanese people, 557 men and 567 women, aged 40-89 years. Information about the seven “loco-check” items was obtained from present inquiry sheets. Physical functions were examined by grip strength, knee extension strength, walking speed and one-leg standing time with open eyes. The averages of these test values, controlled for age and BMI, were compared between the “loco-check” (+) group and the “loco-check” (-) group. Also we examined about the trend of decline of physical function, together with SF36 physical function subscale score, as the number of the items chosen increased. Results: Adjusted average values of all four physical function examinations in the “lococheck” (+) group were significantly lower than those of the “loco-check” (-) group (all, p . Also the adjusted average values of the majority of four tests were significantly lower in those who checked each of the “loco-check” items than those who did not, for most of the items. It was also revealed that the more items subjects checked, the lower the adjusted average values were, except for one-leg standing time. It was also the case with SF36 physical function subscale score. Conclusion: We showed the utility of “loco-check” as a simple tool not only for noticing the physical dysfunction of elderly people, but also for estimating the extent of it, except for balancing ability, particularly by counting the number of checked items.

关键词： locomotive Syndrome Loco-Check Physical Dysfunction Estimation Elderly People

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SAFETY ASSESSMENT ON NEGOTIATION OF locomotive UNDER THE CONDTION OF TRACTION

SAFETY ASSESSMENT ON NEGOTIATION OF LOCOMOTIVE UNDER THE CON...

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第一届交通运输工程国际学术会议

作者： Jianxin. Liu , and Kaiyun. Wang Traction Power State Key Laboratory, Southwest Jiaotong University Chengdu 610031, P. R. China

Considering the effect of the movement of wheel and rail and the traction force, the formula to calculate creepages between wheel and rail are given in this paper, and characteristics of wheel/rail dynamic interaction are studied on the basis of a theory of vehicle-track coupling dynamics, and the safety on negotiation of the locomotive with the traction is investigated and assessed in detail. Many theoretical results show that under the condition of the traction, the value and the direction of the creep force in longitudinal can be changed, when a locomotive passes through a curved track with a speed of 140 km/h and a radius of 1600 m, some of safety indices, including the derailment coefficient and the wheel/rail lateral force, are up to their limits, it is suggested that the traction power should be no higher than 4500 kW from the point of view of safety according to the railway vehicle specification for evaluation of dynamic performance and accreditation test in Chinese Railway.

关键词： safety locomotive negotiation traction wheel/rail creep force simulation

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Drag reducing nose fairings for existing freight train locomotives

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Advances in Aerodynamics 2022年第1期4卷 780-797页

作者： Chad L.Stucki Daniel Maynes Corvid Technologies MooresvilleNC28115USA Department of Mechanical Engineering Brigham Young UniversityProvoUT84602USA

At cruising speed,one of the most significant contributing factors to train fuel consumption is aerodynamic drag,and the leading locomotive experiences much more drag than any other car in the *** work reports on the drag reduction that can be realized by the use of add-on nose fairings that are deployed on leading locomotives in a train *** types of fairing shapes were considered and all fairing walls are *** is anticipated that the fairing shapes would result from the deployment of easily stowed panels in an origami inspired *** of the fairing shapes has the appearance of a wedge and the other fairing is also wedge shaped,but with flow directing side wall *** each general fairing shape,the important dimensions were parametrically varied in a systematic manner to identify the dimensions that yield maximum drag *** the first shape,45 different scenarios were considered;for the second shape,15 were considered.A steady commercial computational fluid dynamic solver was employed to solve the flow field and locomotive drag for each of the *** best performing wedge-shaped fairing reduced the leading locomotive drag by nominally 14%and the best performing fairing shape with the side walls reduced the drag by 17%.

关键词： Drag reduction Front-fairing Origami locomotive

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Applications of optimal mathematic-physical models in metallurgical manufacture scheduling system at Baosteel

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Journal of University of Science and Technology Beijing 2003年第6期10卷 30-34页

作者： JianQiu NaiyuanTian ZhixinLu GuoweiSun MetallurgicalEngineeringSchool UniversityofScienceandTechnologyBeijingBeijing100083China BaoshanIronandSteelCo.Ltd. Shanghai201900China

The transfer of mass flow between ironmaking and steelmaking process atBaoshan Iron and Steel Co. Ltd. has been analyzed. The mathematic-physical models of transportscheduling for hot metal manufacturing have been researched combined with the practical problem inthe metallurgical manufacture procedure. Taking into account these models, the scheduling softwarehas been designed, programmed and tested on-line. The new automation system of production schedulinghas been implemented successfully at Baosteel, which produces a great economic benefit.

关键词： mathematic-physical model software applications locomotive transportscheduling

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OPTIMIZED ADHESION CONTROL OF ELECTRIC locomotiveS BASED ON WAVELET ANALYSIS AND CLOUD MODEL

OPTIMIZED ADHESION CONTROL OF ELECTRIC LOCOMOTIVES BASED ON ...

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第一届交通运输工程国际学术会议

作者： HUANG Jingchun1, 2, XIAO Jian1, BAI Yi-feng1, LIAO Shuang-qing1 1School of Electrical Engineering, Southwest Jiaotong University, Chengdu Sichuan 610031, China 2School of Mechatronics and Power Engineering, Lanzhou Jiaotong University, Lanzhou Ganshu 730070, China

The driving and braking force of electric locomotives depend on the adhesion force between rail and wheel. The characteristics of adhesion are strongly affected by environment, the conditions between rail and wheel, the design and operation of the locomotive. The adhesion force between rail and wheel has severe nonlinearity and uncertainties. It is very important to realize optimal adhesion control in railway field. In this paper the characteristics of the re-adhesion phenomenon in locomotive traction system were analyzed. The simulation model based on those characteristics was developed. A re-adhesion control method of locomotives based on cloud model and wavelet analysis was proposed. Simulation results show that slips will be suppressed effectively and optimized re-adhesion control can be realized.

关键词： Cloud model Adhesion control Wavelet Analysis locomotive

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