交通运输工程学报

Civil engineering and sustainable development in 21^th century

LU Zhi-tao

Abstract: The 21 th century will be characterized by high technologies. The civil engineering will be pushed to develop at high speed by high technologies. The present situation and features of civil engineering in China were analyzed and reviewed, and the developing future of civil engineering in China was forcasted. Based on the idea of sustainable development, the key studies of civil engineering in 21 th century was discussed.More>

2002, 2(1): 1-5.

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Research of high speed railway freight car and its technology

LI Fei, FU Mao-hai

Abstract: To increase the speed of freight train is an effective measure to raise the capacity and efficiency of railway transport. The key parts in a high speed freight car are bogie and braking system. In this paper, the development history, basic structure of high speed freight car bogie and braking system aboroad and general operating condition of freight car in China are described briefly. The mode of development of high speed freight car of China will be put forward. Also the paper points out that China should use the experience of developed countries for reference in development of the bogie and braking system for high speed freight car instead of the basic frame of present freight car, and develop the Chinese featured mode on high speed freight car.More>

2002, 2(1): 6-12.

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Lateral stability behaviors of railway passenger car system with elasto-damper coupled wheelset

ZHANG Li-ping, LI Fei

Abstract: In this paper, the Elasto Damper Coupled Wheelset (EDCW) model is introduced in the passenger car system whose lateral stability behaviors are analyzed by eigenvalue method. According to choose variable parameters, the EDCW model can become identical with damper coupling wheelset, torsionally flexible wheelset and independently rotating wheelset. The effective result indicates that proper coupler torsional stiffness value and coupler torsional damper value can improve the vehicle critical speed.More>

2002, 2(1): 13-19.

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Dynamics model and behavior of pantograph/catenary system

MEI Gui-ming, ZHANG Wei-hua

Abstract: For the civil CH160-0 simple stitched catenary on the high speed railway and SS7 pantograph, the finite element model of the catenary is sep up. The natural frequency and the corresponding mode are calculated and the equation of the vibration is educed. The nonlinear dynamical differential equation of the pantograph is list. By the Taylor series, the nonlinear model is linearized and the equivalent parameters of the frame of the pantograph are gained. The vertical coupling dynamic model of the pantograph/catenary system is established. Based on the linear model and the nonlinear model of the pantograph, the computation and the comparison of the simulation on the dynamic characteristic of the pantograph/catenary system are come out with the vibrating responses of the locomotive and track taken into consideration.More>

2002, 2(1): 20-25.

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Finite element analysis for an articulated underframe of railway freight car body

LU Yao-hui, WU Ping-bo, CENG Jing

Abstract: The finite element model for articulated underframe of railway freight car body is established. Computations of strength, stiffness, inherent frequencies and vibration mode shapes of two underframe structures are complemented. The comparision study of the rationalities of two articulated structures is undertaken, and suggestion for imporoving the design is given.More>

2002, 2(1): 26-28.

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Vibration and noise of the urban rail transit

LIU Jia-hua, LIAN Song-liang

Abstract: With the development of the urban economy, the vibration and noise induced by the urban rail transit is attended more and more. This paper described the cause of inducing the vibration of track structure and the indices of evaluating environment vibration, analyzed the copmosition of the noise of the urban rail transit and the indices of evaluating environment noise. After analyzing the data from home and abroad, it is pointed out that the wheel/rail noise is the main composition in the urban rail transit noise, and the key is to reduce the vibration of the track structure. Some suggestions are put forward for reducing the vibration of the track structure.More>

2002, 2(1): 29-33.

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Study on asphalt mixtures fatigue properties by testing

GE Zhe-sheng, HUANG Xiao-ming

Abstract: There are two kinds of load controlling mode for asphalt mixtures fatigue testing: stress controlling mode and strain controlling mode. However, the latter is more practical. Firstly, five kinds of asphalt mixtures were experimented with the fatigue testing of control strain mode using MTS810. By the experiment, a fatigue function between fatigue life span and the value of repeated strain as the ratio of strain level was set up. In addition, their fatigue properties were analyzed. It is shown that at the same strain level, asphalt mixtrues logarithm fatigue life is normal school, meanwhile, relation of strain level with logarithm fatigue life is linear. In the fatigue testing of control strain mode, when asphalt mixtrues modulus is much lower, its fatigue life is much longer.More>

2002, 2(1): 34-37.

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Analysis on the stress intensity factor(SIF)for mixed-mode crack atbottom base layer with weight functions expressed with matrix

LUO Rui, HUANG Xiao-ming

Abstract: Due the variations of materials, shrinkage of base layer(especially the cementitious binder is used), temperature stresses, poorly compacted soil, poor constraction and poor maintenance and the mixed-mode loads subjected to the pavement, mixed-mode cracks are easy to occur at the bottom of the base layer of pavements, so it is necessary to analyze the stress intensity factors for the mixed-mode cracks at the bottom of base layer.The method to calculate the mixed-mode stress intensity factors is derived with the matrix weight functions according to the energy rule, superpostition theory and Betti's reciprocity theory.The method to get the constant coefficients of weight functions is also analyzed, which is based on the SIFs by finite element method.The weight functions are checked by the finite element method, and the agreement appears to be fairly good for the whole results by the two methods, which reveals the weight function method is very efficient.Thecorresponding programs arealso made, and it will be useful for analysis on the reflecting cracks in pavements and the engineering applications.More>

2002, 2(1): 38-42.

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Optimizing design method of highway slope

FENG Guang-le, LING Tian-qing, XU Zhi-hong

Abstract: According to slope's essentiality coefficient, this paper puts forward the concept of safe degree, discusses the relation of engineering and its environment, and probes into the optimizing design method of highway with its geological, hydrological and environmental message. The paper introduces the modified rock mass rating method by the numbers.More>

2002, 2(1): 43-47.

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Template design method and its application in the integrated highway CAD system

XU Jin-liang

Abstract: Through the analysis and study on the design object, this paper presents an object template and component template design method for highway design, it also presents the data sturcture for the cross section component template based on the highway cross section design. This method has been used in the development of the integrated highway CAD system. The application results show that the template design method has the characters of direct, simple and convenient.More>

2002, 2(1): 48-50.

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Traffic forecasting method in feasibility research of highway project

GAI Chun-ying, PEI Yu-long

Abstract: This paper analyzes the characteristics of highway project, then probes into traffic forecasting method in feasibility research of highway project on the basis of area economic forecasting. Meanwhile some practical problems and corresponding measurements are followed aiming at some traditional method.More>

2002, 2(1): 51-54.

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Multilevel grey evaluation of present bridges

CHEN Xiao-jia

Abstract: Based on the grey theory, the application of a multilevel evaluation method for the present bridges is discussed. The indexes of the bridge evaluation system are emphatically inquired into, and a practical example to the three present bridges is showed. For the sake of taking effect of all the evaluation information in different grey degrees, disperse information from the experts is handled with weighted vector describing different grey degrees and making single value. At last, three comprehensive values are given so as to arrange in order. The evaluation results state that the multilevel evaluation method can be applied to comprehensive evaluation on the indexes of the bridge evaluation system. The method is objective, reasonable and serviceable to operate. It is beneficial to standardize the management and decision of the present bridges evaluation.More>

2002, 2(1): 55-59.

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Study on highway traffic noise prediction

ZHAO Jian-qiang, DONG Xiao-lin

Abstract: Highway traffic noise prediction models are presented and analyzed under different conditions of hard earth's surface, soft earth's surface, finite length highway and infinite length highway. The error source of the current model is shown, and accurate models are presented under different conditions of earth's surface and highway length respectively.More>

2002, 2(1): 60-63.

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Micro-simulation models of traffic flow of developing and evaluating ITS

WANG Xiao-yuan, JUAN Zhi-cai, JIA Hong-fei

Abstract: Aiming at developing, evaluating and optimizing ITS projects, the importance of traffic micro simulation models is discussed. The integrated environment of the already existed micro simulation tools is analyzed, and the weaknesses of theoretic basis and integrated environment of these models are pointed out.More>

2002, 2(1): 64-66.

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Statistics analysis on vehicle flow starting wave speed of Zhoujiazui road

WU Zheng

Abstract: In this paper, it is proved that the vehicle flow starting wave speed distribution in green light period at a plane intersection satisfies Poisson assumption as well as a normal assumption by actual observations and statistics analysis, and the Poisson assumption is better agreement with the observation data. It is also shown that with the increase of the vehicle flow queue length the starting wave speed will increase as a negative exponent function under the condition of Zhoujiazui road, which is obviously different from the roads in which vehicles run at low speed and together with bicycles. According to these results, it is proposed that the traffic behavior parameter in the traffic fluid dynamics model may be value about 2.5 in case of modeling of the expressway traffic procedures.More>

2002, 2(1): 67-73.

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Survey on freeway traffic flow modeling

GONG Xiao-yan, TANG Shu-ming, WANG Zhi-xue, CHEN De-wang

Abstract: Traffic flow modeling as the basis of traffic control、traffic design、traffic analysis、traffic simulation and traffic control decision making always is the the research focus in traffic engineering field. This paper makes a detail introduction of traffic flow modeling from three different aspects. Expectation on its development is also given.More>

2002, 2(1): 74-79.

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A class of nonlinear optimization models for location of station by genetic algorithm

NIU Hui-min, HU An-zhou

Abstract: This paper analyzes the background and origin of the problem for lication of assistant yard, discusses the influence and revision for local traffics as building a new assistant yard in a railway hub. Based on above analysis and discussion, a mathematical model for location of assistant yard and optimization of local traffics in the hub is designed. According to the characteristics of NP hard problem, the main measures for solving the model by genetic algorithms is put forward, and a numerical example is tested on a real railway hub in China.More>

2002, 2(1): 80-84.

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Regional logistics center planning method

LI Xu-hong, HU Wen-you, MAO Hai-jun

Abstract: Modern logistics industry regarded as a new economy increasing point have been emphasized by all level governments, it has been taken as an important symbols of modernization and an accelerator to develop national power and economy. Though the logistics development planning of some cities has been worked out, the maneuverability of the planning is very low because of using the immature planning method. There is more difference between the logistics planning and its operation. The planning method of regional logistics center is researched with regional logistics planning, which will improve the maneuverability of regional logistics center planning.More>

2002, 2(1): 85-87.

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Approximation of flow-Palm and application

LI Xia-miao, LU Feng-shan

Abstract: Flow Palm can effectively describe traffic flow. Based on approximation of flow Palm, this paper sets up a simulation procedure of Markov process. Some operating indexes of service queue systems can be analyzed quantitatively by this procedure.More>

2002, 2(1): 88-91.

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Simulation of market price strategy in railways passenger transport

XU Gang

Abstract: Price strategy is an important content of business management, which concerns development and the survival of enterprise in market economic environment. To the situation of railway passenger transport market in China, this paper discusses the simulation model of railway passenger transport market price stratgey. The simulation structural design and its content are put forward.More>

2002, 2(1): 92-95.

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Architecture and key techniques of digital driving system within intelligent transport information network environment

SHEN Zhong-jie, WANG Wu-hong, HOU Fu-guo, YI Bing

Abstract: A new concept of digital driving system is proposed on basis of intelligent transport information network environment. The logic relations that control the input and output variable in human, vehicle and road environment system arte found out, after driving rules of the vehicle motion are analyzed. The digital driving model architecture based on intelligent transport information network environment is established, and the digital driving theory is introduced, so the digital driving theory and road safety driving theory are enriched, and vehicle driving safeties are enhanced.More>

2002, 2(1): 96-100.

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Safety distance about car-following

XU Jie, DU Wen, SUN Hong

Abstract: It is pointed out that the traffic accident mostly result in improper driver's action. The driver's capability of response time and speed estimation are studied, and driving performance by car following in traffic is investigated, in order to calculate the appropriate driving safety distance, which assures that neither the rear end collision occurs nor road capacity is affected. If the following distance is S (m), and the following vehicle's velocity is V (m/s), the study results show that when S > V/2, the following is safety under the good condition of driver and vehicle, when S > 2V, the following is safety under the poor operation of driver and vehicle.More>

2002, 2(1): 101-104.

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Evaluation of retarder to automobile braking stability

MA Jian, CHEN Yin-san, YU Qiang, GUO Rong-qing

Abstract: This paper puts forward the concept of generalized I curve of the braking forces distribution between the front and rear of automobile equipped with retarder, and educes the computation equations of synchronized coefficient of road adhesion. The paper also establishes the qualitative and quantitative evaluation method of the braking forces matching up to the generalized I curve for automobile equipped with retarder. From the point of braking stability, evaluation of braking forces match of retarder can be inferred.More>

2002, 2(1): 105-109.

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The self-adaptive fuel ignition unit for the flexible-fuel automobile of gaseous fuel/gasoline

ZHANG Chun-hua, JIE Ya-li, JIAN Xiao-ping, JIAN Lin-sha

Abstract: When a flexible fuel automobile is fueled with gaseous fuel or gasoline, the optimum ignition advance angles are largely different. After a self adaptive ignition unit is applied, the ignition advance angle of the engine is automatically changed according to different fuels. This paper analyzes the software and hardware structures, and working principle of the self adaptive fuel ignition unit controlled by a single chip computer. The experimental results show that, after applying the ignition unit, the power output increases 2.6%~3.1%, the specific fuel consumption decreases 2.6%~3.4%.More>

2002, 2(1): 110-113.

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Development of hybrid electric vehicles(HEV) performance simulation software

CHEN Xiao-dong, HE Ren, YANG Zheng-lin

Abstract: The development situation of simulation software for hybrid electric vehicle is presented. The ADVISOR 3.1 developed by National Renewable Energy Laboratory (USA) is discussed, its modeling method and simulation process are analyzed, which will be helpful for the development of chinese simulator of HEV performance.More>

2002, 2(1): 114-117.

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Output feedback robust control algorithm applied to ship steering autopilot with uncertain nonlinear system

YANG Yan-sheng

Abstract: A state feedback robust control algorithm is presented for ship steering autopilot with uncertain nonlinear system based on known parameter bound of the system and known bound of input disturbance by use of the theory of Lyapunov stability. Owing to not all states of ship motion being achieved and only ship course can be measured on board, so a high gain observer is proposed to estimate the states of ship motion and then a output feedback robust control algorithm is developed. An example illustrating the method described is included for ocean going training ship. It is shown that the controller can make the designed system guarantees the satisfied performance by simulation based on the Matlab Simulink package.More>

2002, 2(1): 118-121.

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Integrated design of monitoring and controlling system for airfield lighting based on local network

ZHANG Jun-dong, REN Guang

Abstract: The airfield lighting monitoring and controlling system is developed in order to eliminate the deficiency of manually monitoring and controlling the airfield lighting, to improve the efficiency, the reliability and the rapidity of the system, and to realize nationalization and modernization of the airfield systems. Various technologies of hardware, software and network are used in ths system to realize sending and receiving in the network of the system in real time, to achieve the monitoring and control the airfield light and the status of the failure and the fire alarm timely, to backup the data and operational commands using the SQL server 7.0 database. A self checking technique is also utilized to fulfill the requirement of reliability and maintenances. In software design, three programs are developed for the lighting control, electric power monitoring, diesel engine monitoring and controlling separately. The three programs are running independently in same time. The paper also presents the composition method of the system, gives the design scheme of the software, hardware and man machine interface and some solutions of actual problems in the development and application from the programming experience by the authors.More>

2002, 2(1): 122-126.

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