2002 Vol. 2, No. 3

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Development of automotive technique
GUO Kong-hui
Abstract: With the development of automotive industry, automomive plays an important role in modern society. But automotive is being faced a lot of challenges, such as energy resource, environmental pollution and traffic accidents. The PNGV program in USA to solve those challenges was introduced. The technological demands of PNGV were discussed. The technologies developing for speeding up automotive intelligence was presented.More>
2002, 2(3): 1-6.
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Mode of development for bogies of high speed car
LI Fu, FU Mao-hai
Abstract: The application of high speed train is an effective measure to rise the capacity and efficiency of railway transport.The key parts in a high speed passenger car are bogie.The development history, basic structure of bogies of high speed passenger car abroad are introduced, general development history and operating condition of passenger car bogie in China are described briefly.Combined with practic situation in China, the mode of development of bogies at high speed passenger car in China was put forward.It is pointed out that we should use the experience of developed countries for reference in development of the bogie for passenger car, and develop the Chinafeatured mode on bogie of high speed train.More>
2002, 2(3): 7-14.
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Design of a new rubber bumper of railway freight car
ZHAO Yong-xiang, LI Yang-hui, LIN Song, DAI Zhen-yu
Abstract: New structural scheme is introduced and design method is presented for a new rubber bumper of the railway freight car with 1 m wide trucks.The bumper is only made up of two exchangeable units, the butt plate rubber unit and the partition plate rubber unit.In addition, a zero initial press force is employed.These make the bumper holds advantages of light in weight, lowest in impact force and good in bumping effect.It is easy to be assembled and disassembled, good in exchangeability, lower in cost of manufacturing and maintaining and higher efficient in use of the bumper volume.The structural scheme provides also a capacity of developing the rubber bumpers used for high speed, sub high speed and heavy railway cars. The design method has been effectively applied to the development of present rubber bumpers.More>
2002, 2(3): 15-18.
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Defer effects of crack propagation of bogie
ZHANG Li-min, MEI Gui-ming
Abstract: With the enhancement of the speed and the load capacity of rail vehicles, the running conditions of bogie frame and the main supporting parts of rail vehicle become worse.In order to reduce the interaction force between rail and wheel, the weight of the frame has to be optimized.Thus the fatigue strength of the bogie is of concern.The fatigue experimental results of a high speed train show that the crack propagation of the frame slow down under the cyclic loads.The concept of relaxation of residual stress under cyclic loads and open and close of crack are utilized to analyze the effects of crack propagation.The analysis shows that the main reason of the crack propagation slow down of the frame is the relaxation of the residual stress under the cyclic loads.Crack close also affects the crack growth greatly.The maximum allowable length of non propagation crack is calculated under the given configuration and cyclic loads.More>
2002, 2(3): 19-22.
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Direct method for evaluation of wheel derailment in simulation of railway vehicle dynamics
YANG Chun-lei, ZHAI Wan-ming
Abstract: According to the coupling relation of wheel rail contact, a direct method is proposed to evaluate wheel derailment based on the wheel rail contact point.The advantage and the principle of the method are described. As an example, wheel derailment was simulated for a full scale freight car negotiating a curve from the point of view of vehicle track coupling dynamics.The results show that this principle is a very good method to evaluate vehicle derailment especially in simulation of railway vehicle dynamics.More>
2002, 2(3): 23-26.
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Method of equivalency transform for power spectrum density of track irregularity on central line from on left/right rail
WANG Kai-yun, ZHAI Wan-ming, CAI Cheng-biao
Abstract: On the basis of the transform relation between railway track irregularity on the central line and railway track irregularity on the left/right rail derived from the power spectrum density in space domain, this paper puts forward a new method of equivalency transform for power spectrum density of railway track irregularity on central line from on left/right rail by means of the spectral estimation of cycle graphs and the algorithm of nonlinear least squares. According to the method, the parameters of the PSD function expression are given with an example.More>
2002, 2(3): 27-29.
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Influence of tilting control system for dynamic behavior of tilting train
BU Ji-ling, FU Mao-hai, NI Wen-bo
Abstract: Proceeding from the control arithmetic of tilting train, the consist of control system and the PID arithmetic were discussed.The tilting coach system dynamics model with close loop control arithmetic is built.Using the model, the influence of the control system's parameters, the delay time and the invalidation of the control system for the dynamics behavior of tilting train are studied.The results for the security of tilting coach are obtained.More>
2002, 2(3): 30-33.
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Train running safety and comfort analysis of the cable-stayed bridge on Wuhu Yangtze-river bridge
LI Xiao-zhen, CAI Jing, QIANG Shi-zhong
Abstract: The 3D free vibration properties of the cable stayed bridge on Wuhu Yangtze river bridge, which is of 180+312+180m span, are analyzed by space bar FEM model. The coupling vibration responses of vehicle bridge system under moving trains are calculated. Based on the reasonable assessment index, the train running safety and comfort of the bridge are analyzed in detail.Resultsshow that, though the ratio of deflection to span for bridge under design load is 1/587, the train can pass it safely and comfortably.More>
2002, 2(3): 34-40.
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Numerical simulation of subgrade embankment on sloped weak ground
JIANG Xin, WEI Yong-xing, QIU Yan-jun
Abstract: Numerical analysis was conducted to simulate the deformation behavior of subgrade embankment on sloped weak ground using commercial software GEO SLOPE.Critical structural responses such as strain and stress at the toe of embankment slope were abstracted to evaluate the effectiveness of engineering measurement used to improve stability potential of the filled embankment.Cross sectional factors influencing the deformation behavior of embankment were also explored. Research results show that numerical simulation can provide reliable and rigorous guide in the design and construction phases in infrastructure development.More>
2002, 2(3): 41-46.
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Mechanical analysis of pavement of orthotropic steel deck
QIAN Zhen-dong, HUANG Wei, LUO Jun-wei, MAO Quan
Abstract: The stress-strain properties of orthotropic steel deck pavement and adhesive performance between pavement and steel deck are analyzed under various modulus of asphalt concrete and load case.Based on the analysis, the worst-case load location and the mechanical indexes of pavement material are determined, including the maximum allowable tensile stress, tensile strain and shear strength of adhesive layer material, which can be served as reference standards of pavement material in order to search the suitable pavement project.More>
2002, 2(3): 47-51.
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Stability evaluation of depth cutting slope in rock mass base on artificial neural network
BAO Hui-ming, HU Zhang-shun
Abstract: Based on comprehensively analysis of the deformation and failure mode of depth cutting slope on the rock mass, the evaluating indices of the slope engineering stability in rock mass are pointed out.The application of the theory of artificial neural network(ANN) in the stability cf the depth cutting slope in the rock mass is analyzed.Based on the ANN, the stability evaluation method of the depth cutting slope is presented. The manner is effective and practice by evaluation the practice freeway slope.More>
2002, 2(3): 52-56.
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Mechanism of pollutant movement in a long highway tunnel and one-dimensional analysis
FAN Hou-bin, FAN Zhi-hua, DONG Ming-gang
Abstract: The ventilation of a long highway tunnel is one of the concerns of highway builders.This ventilation process is also the movement of the pollutants in the wind.The latter mainly includes the forms of molecular diffusion, convective movement, turbulent current diffusion and attenuating transformation.By the law of conservation of quality, the diffusion equations of pollutant movement and pollutant turbulence can be followed.These diffusion equations, wind flow equation, boundary conditions and primary conditions contribute to the convection of the mixture of pollutants and air, the equation of diffusive mathematics mechanics.Finally, the one dimensional theory under the regularly given conditions is analyzed and the practical example is calculated, the results show that the simulating calculation of the pollutant movement in the wind in a long highway tunnel only needs the consideration of convection movement and turbulent current diffusion.More>
2002, 2(3): 57-59.
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Simulation model based upon characteristics of urban road network and its shortest path algorithm
ZHANG Guo-qiang, YAN Ke-fei
Abstract: Problems of transportation macro simulation model for urban road network system are studied and a simulation model which meets real characteristics of urban road network system is put forward.This model gives a simple and correct abstraction of direction difference in urban road network transportation characteristics space-distribution and intersection delay, and based on the model, an algorithm for shortest path has been designed.More>
2002, 2(3): 60-62.
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Motion modeling of throwing object on rigid roadway
XU Hong-guo, REN You, WANG Li-fang, LIN Qing-feng
Abstract: Solid throwing objects and their spreading field on traffic accident scene hint important details about the status of traffic accident.This paper analyzes the models involved in the correlation between crash velocity and throwing distance based on motion law of throwing objects (i.e.glass splinter).The generalized throwing motion law that is composed of parabolic motion, spring motion and rolling sliding motion is revealed. The generalized throwing motion formula is derived and the model parameters are calibrated based on the throwing motion of headlamp glass splinter.More>
2002, 2(3): 63-67.
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Operation mode for traffic control and management of freeway
WU Ming-xian
Abstract: The problem of the Chinese freeway traffic control and management were discussed.According to the characteristics of operation mode, in which the high technologies is utilized, a new operation mode that is the integration of design, installation and operation (DIO) was propeosed.The basic principle of carring out this mode was put forward.More>
2002, 2(3): 68-70.
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Assessment index of transportation system operation
CAO Zhong-yong
Abstract: According to some sample enterprise's real business operation level, which are selected in Shanghai's different transport industries in a certain period, a complete and tight assessment system is proposed, so that to indicate the condition of transportation system operation flexibly. Based on the construction of corresponding standard model of assessment, the sample standard deviation between the standard operation index and the sample enterprise real index value is deeply analyzed. Then the integrated deviation coefficient is deduced, upon which a formula and example of the transportation system operation's assessment index is proposed.More>
2002, 2(3): 71-75.
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Petri net simulation algorithm of maximum flow in transportation network
SUN Tong-jiang, HUANG Sheng-guo
Abstract: With the development of the research about comprehensive traffic system and intelligent traffic system, the technical problem of transportation requirement analysis and network analysis is supposed to be resolved firstly. Petri net theory can be used to solve the maximum flow problem in the ransportation network.Petri net and Petri net model of directional network are first introduced, then, a more applied method of seeking the maximum flow is given out.With the use of Petri net simulator, nondirectional transportation network is converted into a directional network, and its dual graph, denoted by DG, is converted into its Petri net model, then automatically get the maximum flow of the transportation network by seeking the DG's shortest path, i.e. the G's minimum cut capacity. This visual and intuitionistic method is more convenient and faster than the existing methods.More>
2002, 2(3): 76-80.
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Planning of special distribution park based on development zone
MAO Hai-jun, LI Xu-hong, HE Jie
Abstract: Distribution park planning is an important content of distribution park construction.A lot of distribution parks will be constructed in many cities and districts.Because a great of fund is needed in distribution park construction, and expense would be very large if the planning is incorrect, it is necessary that the planning of distribution park should be researched in beginning of distribution park construction. The planning of special distribution park based on development zone is researched, which is expected to help to planning execution of the special distribution park construction.More>
2002, 2(3): 81-84.
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Industry property and development rules of highway
XU Hai-cheng
Abstract: This paper offers the problem of highway industrialization, analyses the contents of highway industrialization, researches the industry property and its development rules of highway industrialization in China.More>
2002, 2(3): 85-89.
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Economic compartive analysis of traditional logistics and modern logistics
WANG Jian-wei
Abstract: According to the difference between purpose and function of traditional logistics and modern logistics, this thesis compares and analyzes the internal economic mechanism and motive of two logistics with the combination of traditional cost benefit analysis and consumer surplus theory, then proposes respective applicalbe range and domain of traditional logistics and modern logistics.More>
2002, 2(3): 90-92.
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Deciding to select and load piece goods in container by genetic algorithm
BU Lei, LIU Hai-xu, PU Yun, YIN Chuan-zhong
Abstract: The authors put forward that genetic algorithms could be applied to the piece good's reasonable selection and loading in container for railway transportation, and the visualized realization is also expatiated.It will be propitious to improving decision making and accelerating the container transportation to become logistics.More>
2002, 2(3): 93-96.
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Simulation of collection and allocation of empty containers based on Petri net
LIU Heng-jiang, SHI Xin
Abstract: Petri net can be conveniently utilized to analyze DES and to build its model.This paper analyzes the CAECS (System of Collection and Allocation of Empty Containers), builds its Petri net model, and then simulates the model by simulation software EXSPECT so as to testify the effectiveness of Petri net.More>
2002, 2(3): 97-102.
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Comprehensive evaluation of urban passenger traffic structure
MA Rong-guo, LIU Hong-ying
Abstract: By the holistic and systemic character of urban, the factors that are correlated to traffic structure were analyzed, AHP model was put forward. And the traffic structure was evaluated comprehensively by the gray relationship method. As an example, Xi′an urban passenger traffic structure was given.More>
2002, 2(3): 103-107.
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Civil aviation flight character surveillance and forewarning management
LUO Fan, PING Yun, GUO Shi-ping, LIU Hai
Abstract: At present, some great airline companies are developing flight character surveillance.The analysis of the relevant parameter supplies the effective technical measures for flight safety and training aviators.However, the forewarning management function of the flight character surveillance needs to be enhanced.By diagnosing the management pattern and measure of civil aviation flight character surveillance, a new way of civil aviation disasters forewarning management is stated through flight character surveillance, and the forecast methods of the civil aviation flight character surveillance are discussed.The calculation results show that exponential smoothing is suitable to forecast the trend exceed the limits so as to find the early signs of civil aviation accidents and provide some basis for civil aviation disasters forewarning management.More>
2002, 2(3): 108-111.
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Directional stability of aircraft running on runway with two transverse slopes
LI Guang-yuan
Abstract: In order to properly decide transverse grads of runway, this paper researches the directional stability of aircraft that runs on the runway with two transverse slopes.On the basis of analyzing the forces acting on the aircraft, this paper sets up the motion equation of the aircraft, also puts forward the calculation method of the sideslip angle, using parameter of a kind of aircraft, gets the relation between the aircraft directional stability and the value of runway grads.Resultsshow that transverse grades make very limited influence on the aircraft, when the value of grads is in the range of current criteria (0.8%~1.2%).Even the value of grads reaches 4%, this kind of aircraft keeps its directional stability well.Conclusionsare considered in new criteria.More>
2002, 2(3): 112-114.
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Methods for sustainably improving ships navigation safety
CHEN Wei-jiong
Abstract: The paper reviews the international maritime safety and control methods since IMO's establishment and makes prediction on its future, it reveals the operation mechanism, the essence and the limitation of the "ISM Code + PSC" mode.It proposes to apply the MMEM theory to improve the mode and to realize effective integration of technology and management.It emphasizes safety culture and comprehensive construction of"technology+management+concept" are necessary for continuously improving maritime safety.More>
2002, 2(3): 115-119.
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Design of H∞ robust control based on MATLAB
ZHOU Xiao-hong, LIU Hong-jun, WU Ya-li, TANG Juan
Abstract: The essential idea about H∞ robust control is presented.The design method of H∞ robust control for the space truss structure using MATLAB robust control toolbox is presented too.At the same time, an analysis result on the closed loop system with control is presented.The control effect is very good.More>
2002, 2(3): 120-122.
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Understratum extended design of data network in expressway
SUN Da-yue, CAO Wei, LI Yuan-chun
Abstract: This paper analyses the existing expressway data network, presents a new model based on the data network extended understratum, and gives out two achieved project, enumerates the key configure.More>
2002, 2(3): 123-126.
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