交通运输工程学报

SHEN Zhi-yun

2004, 4(1): 1-2.

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Effect of aging on viscoelastic performance of asphalt binder

TIAN Xiao-ge, ZHENG Jian-long, ZHANG Qi-sen

Abstract: The aging of asphalt binder is an important factor to asphalt pavement service property. The paper applied short-term age to asphalt binder by using RTFO, then agthe residue various hours by using PAV, and studied the effects of aging on viscoelastic performance of asphalt binder by using bending beam rheometer and dynamic shear rheometer. The results indicate that the aging of asphalt binder decreases its viscous performance and enhances its elastic performance, so the resistance to deformation is enhanced while the anti-fatigue cracking capacity decreases.More>

2004, 4(1): 3-6.

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Fatigue properties of cold-recycled asphalt mixture

LI Qiang, MA Song-lin, WANG Peng-fei

Abstract: The paper studied the fatigue properties of recycled mixture under stress-controlling mode through cleavage test, analyzed the influence of temperature on them and made properties comparison with general cement-stabilized materials in some condition. The research indicates that with the temperature dropping, the fatigue impedance is enhanced and the susceptibility of fatigue life towards the stress level is also raised. The recycled mixture possesses more superior fatigue properties than general cement-stabilized materials under high stress levels.More>

2004, 4(1): 7-10.

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Centrifugal modeling test on abutment backfill with EPS inclusion

GE Zhe-sheng, HUANG Xiao-ming

Abstract: The EPS inclusion was put into backfill and abutment to reduce soil pressure of abutment back. The structure with both geogrid reinforcement and EPS inclusion was tested. According to the same strain principle, the structures, ground, backfill, geogrid and EPS inclusion were modeled. When the scale ratio n was 20, the strain of geogrid was studied by digital image analysis technology. It is pointed that the soil pressure of abutment with a collapsible inclusion is reduced markedly, but the settlement of backfill without geogrid increases. Compared to the former, the settlement of the structure with both reinforcement and collapsible inclusion is much less, and the stress of geogrid increases obviously. The results indicate that EPS inclusion is beneficial to make full use of reinforcement, so it is very usefull for practical engineering.More>

2004, 4(1): 11-14.

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Infiltrating properties of modified swelling soil subgrade

WANG Shuang-jie, HUANG Xiao-ming, NI Yi-hong

Abstract: The physical properties, mineral composition and expansive-shrinkage characteristics of the borrow soil were studied, and the evaluation of expansive potential was carried out. The influence of lime-swelling soil by rainfall was analyzed. The results show that the expansion and shrinkage change obviously, the compaction degree lowers clearly and the strong expansive appears where the soil compaction is high. 90 days later, the subgrade deflection becomes stable, and reaches the required strength. As for the subgrade filled with improved light or mid lime-swelling soil, the influence of rainfall appears during the early days of the filled subgrade, and its strength will recovers continuously while the water content lowers naturally.More>

2004, 4(1): 15-20.

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Building method of double tracks railway 3D model

JIANG Hong-fei, TU Peng, LI Guo-zhong

Abstract: The 3D model of double tracks railway was developed by surface partition. With this method the faces of terrain, bed, bridge, tunnel and other entities were cut into regular surfaces, and the grid meshes were utilized to represent them. The algorithm inserted the vertices of bed boundaries into terrain triangular mesh to form a new mesh, deleted the triangles, which located into the bed boundaries, and thereby merged the terrain and the construction models to obtain the 3D overall model of double tracks raiway.The 3D modeling of route was realized based on the model with the integration of 3DS MAX and AutoCAD. The applied results indicate that the method has fast speed and high reliability and is a feasible measurement for building 3D model of double tracks railway.More>

2004, 4(1): 21-24.

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Computation model of additional longitudinal forces of continuously welded rails on bridges

XU Qing-yuan, ZHOU Xiao-lin, YANG Xiao-yu

Abstract: The temporary design criterion for computation additional longitudinal force between rail and abutment and pier on CWR bridge is still being studied at present in China, there are many items, which are deserved to discuss, one of them is the constant longitudinal resistance mechanics model. It is proved that additional flexible longitudinal force, which has the mechanics meaning, is probable not to exist for the long-span bridge with the model. When the load is light, the mechanics meaning solution for the additional winding force is also probably not exist with the model. Because of the shortcomings of the constant model, the variable longitudinal resistance mechanics model should be adopted on the long-span railway bridge.More>

2004, 4(1): 25-28.

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Finite element analysis of slab track subjected to moving load

LOU Ping, ZENG Qing-yuan

Abstract: A finite element method was applied to analyze the dynamic response of slab track subjected to a moving load. The slab track was treated as a model, in which rail was regarded as a long beam supported by discrete viscoelastic supports, and slab as a short beam supported by continuously viscoelastic foundation. The slab track and moving load were considered as a system. Vibration equations of the system could be formulated by using the principle of total potential energy with stationary value in elastic system dynamics and the "set-in-right-position"rule for formulating matrixes. The effects of the speed of the moving load, the rail type, and the spring stiffness of rail support on the response of rail and slab were studied. From the presented numerical examples, when the other parameters being the same, with the increasing of spring stiffness of rail support, the dynamic response of rail decreases; with the increasing of rail type, the dynamic response of rail and slab decreases; with the increasing of moving load speed, the dynamic response of rail and slab increases.More>

2004, 4(1): 29-33.

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Dynamic response parameters of railway ballast-subgrade

NIE Zhi-hong, RUAN Bo, LI Liang

Abstract: Load acted on the surface of ballast was obtained through the vehicle-rail-ballast model. Dynamic computational model for railway ballast-subgrade was established through a coupling of finite elements and infinite elements method. Under train loads, the vibration acceleration and dynamic displacement in ballast-subgrade, which are of different ballast thickness and subgrade stiffness, were obtained in conjunction with Newmark integration scheme. The computational results show that the ballast thickness has evident impact on the dynamic response of subgrade, but the subgrade's impact is not as evident as the ballast thickness's impact.More>

2004, 4(1): 34-37.

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Disturbing of soil masses slope under railway loading

ZHANG You-pa, GAO Yong-tao, WU Shun-chuan

Abstract: The eigenvalue of railway system was analyzed by using LUSAS FEA. According to the analysis results, the eigen- frequency and the response of vertical displacement as well as the principle stress versus dynamic loading time were found. With an in-situ engineering case, a numerical model of soil masses slope under the railway dynamic loading was built. The results show that the disturbing is within 3 m from rail. With time going, the disturbing scope will be expanded.More>

2004, 4(1): 38-42.

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Data visualization system of train aerodynamics test

JIANG Fan, TIAN Hong-qi, CHEN Wei-ping, LIU Tang-hong

Abstract: According to the data of train aerodynamics test, the test data visualization means was studied, and the system of test visualization was realized, the new arithmetic combined data field meshing and region-mapping interpolating was created, the scanning arithmetic was improved, the object-oriented program was adopted in the system. An example indicates that this system can deal with test data rapidly, visually and conveniently.More>

2004, 4(1): 43-47.

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Vibration and isolation of cooling board type refrigerator car

FU Qin-yi, CHENG Hao, JIANG Shu-xia

Abstract: The dynamics model was established, its corresponding mathematical model by means of modal analysis method was developed. The vibration performance was analyzed with this model. In the condition of rigid impact, the ways of vibration isolation were put forward. The results show that the vibration isolation is valuable in the condition of rigid impact.More>

2004, 4(1): 48-49, 53.

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Residual quantity calculation method of EV battery

ZHANG Wei-gang, JIAN Xiao-ping, BI Li-ge, BIAN Yao-zhang

Abstract: According to the residual capacity in any time being the difference of the actual capacity and the quantity of output charges during the discharging of a battery in terms of theory, the paper put forward a formula and a system to compute the residual quantity. Test results show that the system error is about 20%, and the key reason of error comes from the difference between lab discharging mode and practice discharging mode of battery.More>

2004, 4(1): 50-53.

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Noise property of vehicle fuel-fired air heater

SHEN Fu-lin, GUO Jin-gang

Abstract: With sound power, distribution of sound intensity and frequency spectrum, the noise property of vehicle fuel-fired air heater was analyzed. It is pointed out that fan noise, electromagnetic noise and burning noise are the main noise sources, which spread out through the air-inlet and iron box. As a settlement, the measurements silencer and rectangular enclosure are adopted. Application results show that the noise level decreases 4.1 dB in 1 kHz band.More>

2004, 4(1): 54-57.

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Laser locating system of airplane's taking-off and landing track

CAI Liang-cai, ZHENG Ru-hai, ZHONG Xiao-lei, SHAO Bin

Abstract: With this system, the airplane's taking-off and landing track were measured, the method to decide the position of the system was induced. The formula to adjust time error of the system at different axles was presented, the measuring data translation was given, the computing software was developed. An example indicates that this system is feasible and has good efficiency.More>

2004, 4(1): 58-61.

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Reliability design method of airport runway length

CEN Guo-ping, LI Ming-feng

Abstract: This paper introduced reliability theory to the calculation of airport runway length. The random variables relevant to the runway length were analyzed, and distributive models were gained for relative air density, wind velocity, pilot error coefficient and distance from landing site to runway end. With genetic algorithm and importance sampling, a new design method of runway length was put forward based on reliability theory. The reliability of long-term airport was calculated with this method, the calculating failure probability was 4.75×10^-4, and practice result was 2×10^-4~3×10^-4, two results were closed. The results indicate that the method is feasible in the design of runway length and safety evaluation.More>

2004, 4(1): 62-65.

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Train operation adjustment on Jing-Hu high-speed railway

WANG Hong-gang, ZHANG Yi-jun, ZHANG Qi, WANG Zhuang-feng

Abstract: This paper studied the operation process of the high-speed train by applying operation train group. It was pointed out that the operation adjustment was easy for the same kind operation train group and high-medium speed operation train group, difficult for medium-high speed operation train group. For all kinds of operation train group, this paper presented corresponding adjustment rules. Simulation results indicate that operation train group is a validate method for studying the high-speed train operating process, and the adjustment rules are feasible.More>

2004, 4(1): 66-69.

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Airport pavement management system based on GIS

JI Yu-xiong, KAN Sheng-nan, SUN Li-jun, JIN De-xiong, HU Zhi-hong, ZHANG Jian-feng, LIU Xin

Abstract: This paper summarized the advanced experience of building airport pavement management system. According to the characters of the airport pavement management and GIS, the basic structure of system and the division management mode of airport pavement were presented, the building methods for space managing database and attribute database were put forward. The main functions of GIS in this system were introduced. The results show that the methods are feasible for building airport pavement management system using geographic information system.More>

2004, 4(1): 70-74.

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Container information tracing system

WANG Lin

Abstract: With the method of system engineering, a real-time pattern based on dynamic tracing was put forward, its information development period, function system, operation flow, information used for tracing and users' requirements were analyzed. The logical model of the information tracing system was established, and the elementary requirements were put forward. The method of structural system design was used to divide the information tracing system into several subsystems and function into modules, and the frameworks of database and network were discussed. An example shows that the system can guarantee the accuracy of information election, and promote the management level and network scope of container trans-portation.More>

2004, 4(1): 75-79.

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Vehicle visual scheduling system

LI Jun, ZHANG Hong-li, LIU Jian-xin

Abstract: By means of geographical information system, based on optimization theory, this paper studied the vehicle routing algorithm, the shortest route algorithm and routine management model, developed the vehicle optimizing scheduling system. The system integrated image manipulation and visual data technology, which can give the visual vehicle scheduling scheme and be used in daily transportation management with scientific management methods. An example indicates that the system is feasible.More>

2004, 4(1): 80-82.

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Model and algorithm of multiple depot transit vehicle scheduling

LI Zhen, LEI Ding-you

Abstract: Based on analyzing the characteristic of the multiple depot vehicle scheduling (MDVS) problem with full loads, this paper put forward a optimization model, designed heuristic algorithm. Application example shows that this algorithm is feasible.More>

2004, 4(1): 83-86.

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Evaluation indices on urban passenger transportation structure

MA Rong-guo, LIU Hong-ying, LIANG Guo-hua

Abstract: After advancing the principle of choosing evaluation indices on urban passenger transportation structure, the paper combined the character and function of urban passenger transportation system, constructed the system of evaluation indices, created the mathematic methods of measuring evaluation indices, and illuminated the popular methods of evaluation indices how to be used in all-around evaluation. It is proved that the evaluation indices can denote the urban passenger transportation structure, and the methods of measuring evaluation indices are credible, 9 refs.More>

2004, 4(1): 87-91.

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Confirming method of urban taxi quantity

LU Jian, WANG Wei

Abstract: This paper studied the relationship between urban taxi quantity, taxi unloaded ratio and its turnover quantity of citizen and floating population by the investigation of citizen, floating population trip character and taxi operation character, put forward a taxi quantity confirming method, the calculate parameters of this method were taxi unloaded ratio, effective driving mileage, average operation speed and average daily operation time. The results indicate that this method can calculate both today's and future demanded quantity of taxi, it is simple and convenient.More>

2004, 4(1): 92-95.

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Company behavior and market operation of toll road

LI Xiao-ming, HU Zhang-shun

Abstract: According to the theories of economics and traffic engineering, this paper studied the market demand, segmenting market, targeting market, toll pricing method of toll road, analyzed road company behavior, put forward the operation method of road company. The applied results show that the marketing methods can rationalize the operation of road company, and increase the tolling revenue, the regulating methods can control the behavior of road company, and decrease the lost of social welfare. The contents of the paper can direct the operation of toll road company and is also important to the government regulation for toll road.More>

2004, 4(1): 96-101.

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Fuzzy evaluating model of driver's road safety perception

WEI Lang, GAO Li-min, YU Qiang, ZHANG Wei

Abstract: This paper studied the effect of road factors on driver's safety perception by analytic hierarchy process (AHP), and set up a general fuzzy appraising model. By applying the model, an example was calculated. It is pointed that the value of measuring driver's perceived safety reduces from 3.324 before controlling to 2.628 after controlling. The result indicates that the model is a effective method of measuring safety perception.More>

2004, 4(1): 102-105.

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Highway black spot recognition and improvement

HU Xin-min, LIU Tao, ZHANG Tian-hua, HUANG Yong, XIE Hai-wei, YU Tao

Abstract: Based on analyzing the recognition methods, the reasons and improvement means of highway black spots, this paper offered the quality control method for the recognition of highway accidents, the experience-discrimination index method for the recognition of black spots, and the method for ordering the improvement priority of black spots, systematically addressed the details of these methods. Application results show that these methods are feasible, and the improvement is considerable.More>

2004, 4(1): 106-109.

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Optimal celestial positioning constellation combination based on genetic algorithm

ZHANG Shang-yue, JIA Chuan-ying

Abstract: Based on genetic algorithm, and using the definition of celestial positioning constellation GDOP (geometrical dilution of precision), the paper developed the optimal celestial positioning constellation combination model and its software. The results show that the model can select optimal stars combination, change the tradition celestial positioning constellation selection way, realize automatic celestial positioning.More>

2004, 4(1): 110-113.

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Flight dividing in QAR(Quick Access Recorder) data decoding

HUANG Yong-fang, HUANG Sheng-guo, SUN Tong-jiang

Abstract: This paper introduced the essay QAR recording system and the process of decoding, then presented two new methods of flight dividing by finishing a lot of downloading experiments and analyzing the raw data, one is ground on frame counter, and the other is based on the combination of two parameters, frame counter and air/ground. Compared with the traditional method, the new methods could enhance the precision of flight dividing and accelerate the speed of decoding.More>

2004, 4(1): 114-117.

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Real-time algorithm of finding optimal path with changing weight to speed up convergence

TAN De-rong, YAN Xin-ping

Abstract: For obtaining a satisfactory shortest path, this paper proposed an improved LRTA^* to speed up search algorithm convergence through changing value-update rules. Through the trade-off of time and quality of solution, the convergence speed was fasted. Application result shows that the method converges suboptimal solution faster than LRTA^*, it is a better algorithm to solve the satisfactory solution between O-D for a big density route network.More>

2004, 4(1): 118-120.

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Malfunction identifying and modifying of dynamic traffic data

JIANG Gui-yan, GANG Long-hui, ZHANG Xiao-dong, WANG Jiang-feng

Abstract: This paper described the method of malfunction identifying of dynamic traffic data and data-processing procedure with respect to the type of data malfunction, such as omitting, reverting and modifying. All of these can provide accuracy and credible input information to prediction model of traffic states. The result indicates that the methods are feasible, especially, data-modifying resolves the problem of later data-processing brought by data-missing.More>

2004, 4(1): 121-125.

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