2001 Vol. 1, No. 1

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Dynamic Interaction of High Speed Maglev Train on Girders and Its Comparison With the Case in Ordinary High Speed Railwys
SHEN Zhi-yun
Abstract: Reviewing the achievements in vertical, lateral and longitudinal dynamics of high speed train, the dynamic interaction between the high speed maglev and girders has been studied.A comparison of it with the case in wheel/rail typed high speed trains was discussed in detail.The main conclusion obtained is that around 300 km/h wheel/rail trains should be the backbone of the ground high speed rail transit system.In the case that the extraordinary high speed, e.g.400~600 km/h, is required, then the maglev is feasible.The maglev serves as a kind of complement of the main high speed rail system.From this point of view, the high speed maglev Pudong Airport Transit Line in Shanghai is important and should be well constructed.But to construct Beijing Shanghai wheel/rail high speed railway is even more important, and should be put into action as soon as possible.More>
2001, 1(1): 1-6.
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On the Comparison of Dynamic Effects on Bridges of Maglev Trains with High-Speed Wheel/Rail Trains
ZHAI Wan-ming, ZHAO Chun-fa, CAI Cheng-biao
Abstract: A maglev vehicle/girder interaction model and a dynamic model of wheel/rail train and bridge are established, based on the configuration of German high speed maglev system and Japanese Shinkansen system, respectively.Dynamic responses of high speed trains passing through a bridge have been calculated and compared for various running speeds and various spans of bridges.Numerical results show that the ride comfort of the maglev vehicle is much better than that of the wheel/rail vehicle, especially in the situation of extraordinary high speed operation, the dynamic effect on bridge of the maglev train is smaller than that of the wheel/rail train only when the span length of bridge is below 22 m, but for the bridge with middle and large spans the dynamic effect of the maglev train will be stronger than that of the wheel/rail train in high speed operations.More>
2001, 1(1): 7-12.
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Analysis of the Random Vibration Responses Characteristics of the Vehicle-Track Coupling System
CHEN Guo, ZHAI Wan-ming, ZUO Hong-fu
Abstract: Based on the theory of vehicle track coupling dynamics, the vertical and lateral coupling model of the vehicle track system is set up.The random vibration responses are carried out through the numerical integration method, and the vertical and the lateral random responses PSD of the vehicle and the track are achieved by the period graph method.Finally the characteristics of the vehicle track system random responses are obtained.More>
2001, 1(1): 13-16.
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Research on Dynamic Interaction of Train and Track on Roadbed-bridge Transition Section
CAI Cheng-biao, ZHAI Wan-ming, ZHAO Tie-jun, TIAN Li-min, WANG Zhi-peng
Abstract: A mechanical model to analyze the dynamic performance of train and transition section between roadbed and railway bridge was established and a series of reasonable criterions were put forward too.Based on this, the initial deformation of rails due to different subsidence of roadbed and bridge abutment, the effects of the direction and speed of train on the dynamic performance of wheel/track system were studied.At last, the method to determinate the length of transition section was suggested.More>
2001, 1(1): 17-19.
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Research on Fatigue Characteristic of Asphalt Mixture
XU Zhi-hong, LI Shu-ming, GAO Ying, FENG Xiao
Abstract: Some indoor fatigue testing methods of asphalt mixture are stated. The diametral test is commended as a reasonable indoor fatigue test method under present condition in China after it is compared with the flexure method.Fatigue equation of asphalt mixture and tensile strength structure coefficient k are commended here, which can be used in pavement design procedures.More>
2001, 1(1): 20-24.
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Thermal Stress in Two-layer Concrete Slab due to Restraint of Interface
TAN Zhi-ming, YAO Zu-kang
Abstract: Thermal stress in two layer concrete slab is composed of threee parts: (a) inner stress due to nonlinear distribution of temperature in slab section, (b) warping stress due to reaction restraint of foundation, and (c) stress due to restraint strain of interface. An expression is derived for calculating the thermal stress due to restraint strain of interface with different bonding condition, and the characteristic of restraint strain of interface is also analysed and formulated with conventional temperature regime in concrete pavements.More>
2001, 1(1): 25-28.
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On Airport Pavement Evaluation System
LING Jian-ming, ZHENG Yue-feng, JIN Wei-ming
Abstract: Based on some technical suggestions of ICAO and the concerned specifications of China, an airport pavement evaluation system (APES) is concluded and established from various aspects such as the purpose, content and foundation of investigation and evaluation, the general network of APES, the theories of adaptability analysis and remaining life estimate, and the application of the evaluation results.Ths APES that proposed in this paper might be the technical basis of airport pavement management system (APMS) of China.More>
2001, 1(1): 29-33.
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The Transportation Channel between Shannxi and Gansu and the Development of western Area in China
JI Xi-ping, CHEN Yin-san, ZHOU Wei
Abstract: According to the economy character of great northwest area in China, the relationship of economy development of great northwest with the transportation channel between Shaanxi and Gansu provinces is discussed. The transportation channels function, influence scope, tactic arrangement, society and economy benefit are analyzed. The countermeasures are put forward.More>
2001, 1(1): 34-38.
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Some Issues about Traffic Network Planning of Urban Rapid Mass Transit
LI Fu-zhi, HU Si-ji
Abstract: Based on intensive research on several instances of traffic network planning of urban rapid mass transit domestic and overseas, this paper presents the impact, state of art situation and problems to be solved when planning the traffic network of urban rapid mass transit in China. Several ideas are further discussed, such as planning model, characteristic of traffic network, feasible traffic network scale, locating the accumulating and dispersing node of passenger flow, and planning land usage control. And some problems to be studied in the further are brought about as well.More>
2001, 1(1): 39-42.
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Environmental Characteristic and Developing Thoughts of Northwest Railway Network
LI Shao-heng, YANG Yong-ping, HOU Ming-hui, XU Xue-wei
Abstract: Through the analysis of environmental characteristic and motivity in and out the northwest China, the thoughts of constructing railway passage chanels in the northwest and between the southwest and the east are put forward.More>
2001, 1(1): 43-44.
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Macroscopic Analysis of Inland Water Transport Developing
FANG Fang
Abstract: Based on calculating and analyzing these targets of the contribution ratio of inland water transport to national economy, the coefficient of elasticity of transport, the ration of putting and producing, the ratio of labor productivity and continuous development, the effects of inland water transport on national economy are discussed.The need of national economy on inland water transport is analyzed.The role of inland water transport palying in turnover quantity, structure of transport and layout of economy is presented.It provides scientific basis for recognizing the status of comprehensive transport system and formulating developing strategy of inland water transport.More>
2001, 1(1): 45-48.
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The Market Potentiality and Development Strategy of Third Party Logistics in China
ZHOU Qi-lei, QIN Tong-shun
Abstract: The difficult position and reasons which Chinese traditional logistics faced are analyzed. It is pointed out that improving sevice and tapping market potential are the most essential way for logistics to extricate itself from difficult position.The scale of potential demand, the reasons why the demand has not entered into market, the objective market of TPL and the service content of the demand are discussed. According to a investigation, the fundamental tactics for TPL enterprises are presented.More>
2001, 1(1): 49-52.
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Analysis of High-speed Railway Noise Influence and Forecast and Iayout Based on GIS
YANG Yong-ping, WEI Qing-chao
Abstract: Based on the analysis of noise fountain of high speed railway, a math model which shows the effect of the high speed railway on the residents is established, and then the effective figure is forcasted by utilizing the GIS and ArcView technique according the presented math model to provide a scientific method for the railway planning. This math model is very important in the process of automatic railway survey and design under the environmental elements.More>
2001, 1(1): 53-54.
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Application of Multi-Agent in Traffic Control System
YU Zheng, LI Jian-yong
Abstract: The importance and complexity of traffic control system are more and more visible, and the limitation of traditional traffic control methods is confront with challenge.This paper applies Multi Agent technology on traffic control system and discusses its feasibility and prospect.More>
2001, 1(1): 55-57.
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Fractal Filtering and Its Application in Railway Signal
MA Xue-jie, WEI Xue-ye
Abstract: With the development of electrify railway, its quality is degraded that the train receives railway signal.In order to demodulating the valid signal in the strong distrubed envirment, a valid filtering technology is needed.A fuzzy control filtering method based on fractal dimension idea of fractal theory is put forward.Using this method the value of fuzzy control parameters could be adjusted dynamically according to the characters of the complicated signal.Simulation shows that not only a better filtering result is obtained, but bright prospects are anticipated.More>
2001, 1(1): 58-60.
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The Research of Methods of Analyzing Communication Based Train Control System's Reliability
BU Bing
Abstract: The Communication based train control system (CBTC) is very likely to be the trend of the future railway.Some people have doubts about its reliability.A method based on Markov to analyze the reliability of CBTC is provided.Based on the feature that different component types do not interact in such a way as to cause an accident, CBTC model has been decomposed into submodels to be analyzed respectively.The submodels have also been predigested to solve the problem of state proliferation.The effect of human error rate and the failure coverage rate of dualized vital elements have also been analyzed.After that, the state transition map in chain style of different submodels have been given.Because of the orthogonality of the chains, the total accident rate is the sum of the individual chain's accident rates.More>
2001, 1(1): 61-64.
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Study on the Synthetic Link Travel Time Prediction Model of Key Theory of ITS
YANG Zhao-sheng
Abstract: Travel time prediction is one of important problems of ITS research. Some predictive models including historic profile approaches, non parametric regression, time series, neural networks, Kalman filtering, traffic simulation and dynamic traffic assignment models, etc., have been established. None of them can obtain satisfactory predictive results at any time of day and/or under different traffic conditions. On the basis of overviewing the existing prediction models, a synthetic model is proposed.More>
2001, 1(1): 65-67.
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Sdudy on Platoon Dispersion Model
WANG Dian-hai, WANG Zhi-tao
Abstract: The field research is done to two road links in Changchun city by multi spot photography.After data processing, traffic flow volume figures are given.The contrast of these figures with those of TRRL is provided.The intimation of vehicles' speed distribution and run time distribution is also given, as well as the applicable range of each platoon dispersion model.Simulation model of platoon dispersion is also presented with good results.More>
2001, 1(1): 68-71.
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The Optimal Offsets Pattern and Development of Simulation in Signals Control System on Urban Main Road
WEI Lang, CHEN Yin-san, FAN Tian-gong-jing
Abstract: Based on the concept of the state position differences of traffic signals at the intersections, the designing plan and model in signals control system are presented. A comprehensive pattern in the traffic signals control system on the urban main road is developed. The VC++ programming language is utilized to develop visual simulation software. The simulation experiments are carried out to validate the correct of the control parameters.More>
2001, 1(1): 72-76.
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Design of Freeway Automatic Incident Detection System and Algorithm
JIANG Gui-yan, WEN Hui-min, YANG Zhao-sheng
Abstract: As high as 60% to 70% of the traffic delay experienced by motorists in developed countrics is attributed to traffic incident. A substantial reduction in this delay can be achieved by early detection of the incidents that cause it and prompt response to divert the traffic in the upstream flow. Since the late 60s of 21th, Automatic Incident Detection (AID) systems have been developed and implemented to help traffic management authorities. However, high false alarm rates and low poor performance of the adopted AID system have caused some authorities to abandon them. To enhance the reliability, transferability and economization of AID system, a framework for freeway AID system with three grade alarm policy is put forword, and an AID algorithm based on the Artificial Neural Networks (ANN) technology that only need single detector is designed. It was proved by simulated data that the model built on one segment can be utilized to other segments, and all three measurements (DR, FAR and MTTD) are superior to the objective algorithm. Furthermore, the total cost of freeway incident management system can be reduced due to only single detector is needed for one detector station.More>
2001, 1(1): 77-81.
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The Methods of Computing the Capacity of Signalized Intersection
XU Li-qun, WU Cong, YANG Zhao-sheng
Abstract: There are many methods of computing the capacity of signalized intersection in the road networks, which are fit for different conditions. Traffic in China is characterized of mixed traffic flow. Computing the capacity of urban signalized intersections is the task of many transportation planning researchers. Taking a typical four leg intersection for example, three common methods (crashing point method, stop line method and America method) are used to compute the capacity of it respectively. The results of the above methods are compared with the capacity measured on the spot. It shows that the result of crashing point method is closest to the real capacity, however the results of the other two methods are larger than the real capacity. So we can conclude that crashing point method is more suitable for the traffic conditions and the characteristics of mixed traffic flow in China.More>
2001, 1(1): 82-85.
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Discussion of the Policies Framework of Road Traffic Safety
FU Rui, LIU Hao-xue, CAO Li-ya, HU Da-wei, JIA Shou-zhen, GUO Ying-shi
Abstract: The serious road traffic safety situation and the shortcomings in the present management system of road traffic safety in China are analyzed. It is put forward that China should establish a safety guarantee system and construct a safety policies framework. It can think about and solve the ttraffic safety problems uniformly in the national macroscopic administrative level. Furthermore, the purpose of the reduction of the traffic accidents and the improvement of the overall traffic safety levels can come true.More>
2001, 1(1): 86-89.
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A New Identification Method for Accident Prone Location on Highway
FANG Shou-en, GUO Zhong-yin, YANG Zhen
Abstract: The measures and methods of accident prone location (APL) identification widely used now are analyzed and summarized systematically, A new identification method of APL, accident cumulative frequency curve method and its application procedure, are given. They will suit for evaluating the safety situation of China.More>
2001, 1(1): 90-94.
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The Appraisal Methods of Marine Safety
WEN Hua, FANG Fang, XIAO Han-liang
Abstract: Due to the more high request of marine safety management and the need for more effective safety precautions, it is very desirable to develop new marine risk assessment methods. On the basis of an overview of the appraisal methods study of marine safety, the developing trend of appraisal method for marine safety is put forward.More>
2001, 1(1): 95-98.
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Numerical Analysis of Crosswind Stability of Magnetically Levitated Trains
LI Ren-xian, ZHAI Wan-ming
Abstract: Using 2D, steady state, incompressible Navier Storkes equation and two equations k ε turbulent model, the crosswind stability of magnetically levitated trains in different structures between guideway and vehicles have been calculated by finite volume method. The crosswind stabilities of the wheel rail trains and the magnetically levitated trains are compared. Resultsobtained show that the crosswind stability of the wheel rail vehicle is better than that of the magnetic levitated vehicle, and the crosswind stability of the EMS maglev vehicle is better than that of the EDS maglev vehicle.More>
2001, 1(1): 99-101.
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The Structure Design about the Driver's Cab of High Speed Locomotive
LIU Jian-xin
Abstract: The measures reducing the resistance of high speed locomotive while running at high speed are given. According to the current manufacturing conditions in China, the ways and problems being involved to design the driver's cab considering various factors are discussed. The structure of driver's cab are also introduced.More>
2001, 1(1): 102-104.
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The Study of Speed-up Freight Car Bogies
ZHANG Wei-hua, CENG Jing, WANG Yong
Abstract: The dynamic test of homemade speed up freight car on roller rig, specially the process of optimizing the parameters and structure of the bogie are introduced, and the success and fail in designing freight car bogies are analyzed. The theoretical analysis for the dynamics behavior of the freight car has also been done, and the influences of the main parameters are analyzed. Finally proposals for designing bogies and for selecting bogie types are presented.More>
2001, 1(1): 105-109.
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Crashworthy Energy Absorbing Car-body Design Method for Passenger Train
TIAN Hong-qi
Abstract: In order to reduce the losses suffered from collision between passenger trains, a new design method for the car body structure of motor car and trailer is advanced. Car body structures are made up of three parts with diffferent stiffness, by carefully designed. The parts of the front and the end are the weak stiffness structure to absorb energy through plastic deformation in the collision. The middle part, where only elastic deformation occurs, is an elastic deformation structure with strong stiffness. As the passenger train runs normally, car body structure measure up to regulation of intensity and stiffness in the standards. Once collision accident occurred when the train is moving with fairly high speed, the energy absorbing structure produces large plastic deformation along the direction needed to absorb sufficient energy, at the same time, the deceleration must be controlled within the endurable limits to human body.More>
2001, 1(1): 110-114.
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The Quantification Character Parameter System of Debris Micrography
WU Zhen-feng, ZUO Hong-fu, YANG Zhong
Abstract: The wearing debris analysis and the quantification characterization of its micrography are the two important elements which baffle the development and application of ferrography monitoring and diagnosis. Through the comprehensive research in depth, over 100 debris character parameters have been studied, based on the introduction of computer vision technique and the improvement of computer image process and analysis. By analyzing and filtering the present parameters, a complete set of debris quantification characterization comes into being.More>
2001, 1(1): 115-119.
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Effects on Dynamic Property of Reciprocating Machinery for Clearances in Pairs
CHANG Zong-yu, ZUO Hong-fu
Abstract: Dynamics responses of reciprocating machinery with clearances in pairs are investigated. The dynamics model is built of reciprocating engine considering clearnces in the pair between the crank and the linkage and between the piston and the cylinder. It is solved by applying numerical method. This work can be based for research of vibration response for clearances and the wearing fault feather in vibration.More>
2001, 1(1): 120-122.
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Condition Maintenance for Rotatable Tug Boat
XIONG Jun
Abstract: The application of oil monitoring to port tug boat and its results are outlined. The possibility of condition maintenance for marine machinery is described. The role of oil analysis in condition maintenance is reviewed as well.More>
2001, 1(1): 123-126.
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