交通运输工程学报

Influence of aircraft deicer on apron cement concrete

ZHAO Hong-duo, YAO Zu-kang, ZHANG Zhang-an, LIU Chun-chen

Abstract: In order to explore the cause and mechanism of apron cement concrete scaling, deicer component analysis, concrete specimen deicer soaking test and phase analyzing were carried out. It is found that there is no chemical reaction between deicer and cement concrete, water pressure, penetration pressure and vapor pressure variation are increased in concrete after deicer infiltration. The results show that scaling is caused by the freeze thawing cycle, infiltration of deicer deteriorates scaling. The scaling preventive treatments, such as reducing the volume of deicer, limiting its application area and contact time to concrete, and freeze proof ability of concrete could be considered.More>

2004, 4(2): 1-5.

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Matter-elements-analysis method of comprehensive evaluation for pavement condition

WANG Hui-yong, CHEN Yu-liang, RUI Yong-qin

Abstract: There are more subjective factors and their weights can not been accurately decided in current evaluation model for pavement condition. A new evaluation system based on matter-elements-analysis was developed. In this system, the evaluation indices, such as pavement condition, pavement strength, anti-slippery, were constructed, and their characteristic values were calculated to reveal their synthetic relation degrees. According to those values and degrees, the pavement condition can be evaluated accurately. Applied results show that this method is scientific and reliable.More>

2004, 4(2): 6-9.

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Pavement stress analysis of orthotropic steel deck

QIAN Zhen-dong, LUO Jian

Abstract: Aiming at the common damage of steel bridge deck pavement, such as cracking, pushing and local packing and so on, the impacts of pavement on orthotropic steel deck such as maximum tensile stress, maximum shear stress and maximum deflection under the action of vertical and horizontal load were analyzed using finite element method, and the different mechanical results of pavement under the single-wheel load and under double-wheel load were compared. Analysis results show that the horizontal load has great effects on shear stress of pavement, especially longitudinal shear stress. When chosing the maximum tensile stress of pavement as design control index, the simulation results of single-type load are larger than those of double-type load. When chosing the maximum shear stress of bond coat as design control index, the simulation results of double-type load are larger than those of single-type load.More>

2004, 4(2): 10-13.

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Loess subgrade strength law

JING Hong-jun, ZHANG Bin

Abstract: The saturability and infiltration coefficient caused by infiltration water were analyzed by indoor experiments, and the variation law of its shear strength in accompany with compaction degree and water content was studied. The experiment results indicate that compacted fill still has collapsibility, water content influences the basic properties of compacted loess fill seriously, such as saturability, permeability coefficient and compressibility, etc. When water content increases, its saturability and compressibility remarkably decrease, but the permeability coefficient has a crest value near the optimum water content, and its shear strength and water content have non-linear relationship, it and compaction degree have linear growth relationship. The research results show that strict controlling water content of compacted fill and enhancing the compacted degree standard of loess subgrade can enhance loess subgrade massive character.More>

2004, 4(2): 14-18.

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3-D calculation of roadway earthwork volume

CHENG Jian-chuan, LU Qing-li

Abstract: Because the current calculation method of roadway earthwork volume is approximate with its theoretical defect, with digital terrain model (DTM) and its re-triangulation techniques, this paper presented a 3-D algorithm of calculating roadway earthwork volume. It is pointed that the method leads a true value in theory, and ensures a higher accuracy compared with the traditional method in practical tests. This result indicates that the method is feasible.More>

2004, 4(2): 19-22.

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Mechanical performances of box girder with corrugated steel webs under eccentric loading

LI Hong-jiang, YE Jian-shu, WAN Shui, WANG Yi

Abstract: With the finite element method, several geometrical parameters influencing its mechanical performances were analyzed. These parameters include the ratio of height and span, the ratio of width and span, corrugation configuration of steel web and the thickness of steel web. The results show that decreasing the ratio of height and span, the ratio of width and span, the configuration angle, horizontal panel width and the thickness of steel webs can improve its mechanical performances under eccentric loading.More>

2004, 4(2): 23-26.

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New method for formulations of Timoshenko deep beam element

XIA Gui-yun, CENG Qing-yuan, LI Chuan-xi, ZHANG Jian-ren

Abstract: Based on the theory of two generalized displacements of Timoshenko beam, the trial function was used to construct the shape functions of transverse displacement, rotating displacement and shear strain. Using finite element method, linear elastic stiffness matrix, consistent mass matrix and geometric stiffness matrix were derived. The static, dynamic and stable tests show there is no shear locking for the element, numerical results agree with others well. The method is alternative for deriving the formulations of Timoshenko beam element.More>

2004, 4(2): 27-32.

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Application of wavelet transform to obtain track static power spectrum density

JIANG Shu-xia, FU Qin-yi, WEN Zhen-hua

Abstract: Track irregularity and its static power spectrum density were decomposed into different frequency-bands with wavelet transform. Combined with processing skill of wavelet threshold value, high-frequency coefficients of wavelet were quantified, then data were reconstructed, and some interferons and noises in certain frequency-band were removed, which realized denoise and smoothing of power spectrum density. The results indicate that data processing approach based on wavelet transform can increase noise-signal ration of track static parameters, and improve visibility of track static power spectrum density.More>

2004, 4(2): 33-35.

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Finite element analysis of track structure strength

GAO Yong-jie, ZHAI Wan-ming

Abstract: This paper established a finite element model of track structure with the finite element method and ANSYS software, calculated the displacement and stress of track structure. It is pointed that the displacement from the model is little less than those from the traditional method. The results indicate that the model is more reliable and accurate for the strength calculation of track structure.More>

2004, 4(2): 36-39.

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Chinese domestic components of high-speed maglev train body

YAO Shu-guang, XU Ping

Abstract: Structure static analysis of Shanghai maglev train body imported from Germany was carried. Combined with the manufacture technology level of aluminum alloy profiled extrusion material, maglev train body made up of the large-type integral aluminum alloy extrusion material was put forward. Based on the research result of its aerodynamic performances, the eight loads series acted on high-speed maglev train body were made sure refers to the design rules of wheel-rail system car body configuration. Static analysis results of two car bodies show that carbody stress and frequencies satisfy design demands, it is feasible that maglev train body can be made in China.More>

2004, 4(2): 40-44.

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Cross-wind affection on double container train

GAO Guang-jun, TIAN Hong-qi, ZHANG Jian

Abstract: Using numerical computation of fluid flow, the coefficients of vertical force, lateral force and rolling moment caused by cross-wind were calculated, which were related to train speed and wind speed. The equation of train stability was derived with the theory of moment balance from the view of dynamics, and the relation between the train's critical speed of different loading conditions and wind speeds was calculated based on the real running. The effects of vertical force, lateral force and rolling moment on the capsize stability were also analysed. The results show that the vertical force is main factor caused by cross-wind, the critical wind speed of empty car is lower than the speed of loading car, and the critical train speed of loading car is lower than that of empty car.More>

2004, 4(2): 45-48.

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Modeling and dynamics analysis of 70% low-floor light rail vehicles

LI Ming, DAI Huan-yun, DING Lei

Abstract: This paper established the dynamics model of 70% low-floor light rail vehicles, and gave the ways of dealing with the key parts, such as non-driven bogie, independent wheel and joint structure of bodies, etc. Then dynamics performances of the vehicle system, which includes stability, curve passing, ride comfort, etc, were carried out by the mutil-body dynamics analysis software SIMPACK. The numerical results indicate that the vehicle system has good hunting stability, curving performance and ride comfort, and it can meet the demand of operation on tracks.More>

2004, 4(2): 49-52.

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3-D finite element analysis of eddy current retarder

YI Feng-yan, HE Ren, LIU Cheng-ye, HE Jian-qing

Abstract: 3-D non-linear eddy current fields with ferromagnetic moving conductors was studied, the formulation was realized by using the A-Φ-A method in combination with the Coulomb gauge, and 1/8 finite element model was built. The resulting braking torques of procedure of eddy current retarder were compared to measurements. The results show that calculation value and test value are almost equal, the model and computation method are feasible.More>

2004, 4(2): 53-56.

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Antioxidant and antiwear property of additives in vegetable base oil

LI Ying-bo, WANG Xiang-zhong, WANG Yu-min

Abstract: By analyzing the vegetable base oil demands on the lubrication mechanism and biodegradable performance, base oil and additives were chosen reasonably. The uniform design was used for arranging multi-level and multi-factor tests, and the stepwise technique was adopted to analyze the datum by computer.The sensitivity and compatibility among additives and base oil are studied by a series of tests.The optimal proportion and the amount of the additives are pointed out: M_T202∶M_T203∶ M_T204∶ M_DNA∶ M_CuDTP∶ M_T115A∶ M_T152 is 2∶4∶8∶6∶1∶16∶24, their amount is among 3% to 5%. At last, several experiments were made to evaluate the property of formulation by comparing with petrolatum-based lubricant. The results show the former has better antioxidant and antiwear property, and it is biodegradable.More>

2004, 4(2): 57-61.

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Passenger station layout of high-speed railway existing terminal

PENG Wen-sheng, PENG Hui

Abstract: This paper analyzed the characteristics of high-speed railway and the mode of transport organization, and some factors, such as passenger station division, passenger transfer demand, operation system and leadin line project, discussed the relation between the planning of leading the high-speed railway into the existing terminal and the location, character, scale and planning of city. After summarizing the relation between the leading mode and the existing terminal planning, this paper put forward the mode and some suggestions, which are applicable in China. Applied result shows that the project is feasible.More>

2004, 4(2): 62-65.

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Computer simulation of container terminal planning and design

PENG Chuan-sheng

Abstract: During planning and designning the reconstruction project of container terminal, an animated computer simulation model was built, and a series of model experiments were carried out. Experiment results show that maximum annual throughput of the terminal is 1.5×10⁶ TEU, and yard capacity is a bottleneck of the terminal, adding proper number of trailers into the terminal can promote waterfront production. If the terminal operates together with Linhai road container yard, which is used as the terminal's supplement yard for import containers, annual throughput can reach 2.0×10⁶ TEU. The results show that the model is feasible.More>

2004, 4(2): 66-70.

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Review and new thread of highway network planning

LIU Qing-jun

Abstract: This paper studied planning logic and traffic volume forecast of highway network planning theories. Two outstanding problems in planning practice were pointed, the first is the defect in causality and value logic, the second is that traffic volume forecast is short of credibility. In order to solve the above problems, a new method was proposed by using ecological classification and coexistence intellection in ecological system, which was to decide highway network placement by using slow variables, to improve managing methods by using quick variables, as well as to realize the key leading of planning objectives and the integration of highway network functions by using generalized objective planning. The results indicate that the method is feasible.More>

2004, 4(2): 71-75.

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Planning method of construction scale of logistics park

LI Yu-min, LI Xu-hong, MAO Hai-jun, TAO Jing-hui

Abstract: This paper put forward a planning method to decide the suitable construction scale and the total planning construction scale of logistics park, the experiential formula and its coefficients were discussed. Proportion-gather method, analogy method and their details were presented to decide the planning construction scale of each logistics park. Applied results show that this planning method has few subjective factors, and is easily quantifiable and very maneuverable.More>

2004, 4(2): 76-79.

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Empirical highway capacity model of on-ramp junction

LI Wen-quan, WANG Li, WANG Wei

Abstract: The laws of flow rate and headway varied with location in outside lane were studied. The highway capacity model of on-ramp freeway junction was analyzed. The empirical flow rate model was set up using regression techniques and statistical methods. It is pointed out that the headway distribution of traffic in outside lane is variable Erlang distribution. The merging behavior of ramp vehicle was analyzed with gap acceptance theory. The empirical highway capacity model of freeway on-ramp junction was set up by analysis the gap acceptance process. The results indicate that calculation value and measurement value almost equal, this model is feasible.More>

2004, 4(2): 80-84.

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Stock and transport service of enterprise supply chain

CHEN Zhi-ya, FU Yan-bing, LU Feng-shan, FANG Xiao-ping

Abstract: Based on stochastic process theory and management economy theory, this paper studied the stock and transport service.Due to the principle that the total cost in an enterprise should be the least, this paper put forward a stock model of one kind of product, and deduced the formulas of order quantity, order point and the most stock quantity under varying demand distribution conditions and the service standard for customers, and put forward a stock model, which includes the transportation cost.The tested results show that those models are feasible.More>

2004, 4(2): 85-88.

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Location of highway rapid passenger transport system in metropolitan area and megalopolis

WANG Jian-wei

Abstract: According the shape characteristics of metropolitan area and megalopolis, this paper gave out the structure characteristics of traffic lines, with the way of statistics analysis, analyzed the present condition and development trend of passenger flow in metropolitan area and megalopolis from the total, construction and distribution of passenger flow. With technique characteristics of transport methods, it is a reasonable choice to bring up strong development highway rapid passenger system in metropolitan area at present period, to form the comprehensive passenger transport situation, where orbit traffic is skeleton, highway traffic is main body, and branch line aviation is attachment.More>

2004, 4(2): 89-92.

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Traffic impact evaluating method for large commercial developments

ZHOU Wei, LI Wei-dong

Abstract: After introducing the contents of the traffic impact caused by large commercial developments, this paper established an evaluating system composed of monomial indices and comprehensive indices to evaluate the traffic impact quantitatively, which provided scientific foundation and effective solution for traffic impact analysis as an early-warning measure for regional traffic.More>

2004, 4(2): 93-99.

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Risk analysis system of underway ships in heavy sea

LIU Da-gang, ZHENG Zhong-yi, WU Zhao-lin

Abstract: The paper introduced risk analysis theory and formal safety assessment (FSA), as well as the meaning of developing risk analysis for underway ship in heavy sea. The conceptions of risk analysis were introduced, a system of risk analysis was set up, and main work for future studies was put forward.More>

2004, 4(2): 100-102.

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Design method of pedestrian phases at multi-phase signal intersection

MA Wan-jing, LIN Yu, YANG Xiao-guang

Abstract: This paper studied all the possibility of combination between pedestrian phases and motor phases, and put forward the design method of pedestrian phases under the condition of twice -cross street. The comparison of the method and the traditional design method of pedestrian phases demonstrates the new method can shorten the minimum green time, and reduce pedestrian delay.More>

2004, 4(2): 103-106.

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Recognition of vehicle license character based on multi-fractal dimension

XIAO Wang-xin, ZHANG Xue, HUANG Wei

Abstract: Fractal dimension of some typical vehicle license characters were calculated in the condition of three zoning to vehicle license. It is found that prolific property of vehicle license can be obtained through wavelet transform, multi-fractal dimension is a good tool to solve the problem that threshold is hard to decide when too close between some characters using single fractal dimension. Simulation results show that the method is feasible to recognize vehicle license characters.More>

2004, 4(2): 107-110.

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Real-time data transmission system of moving locomotive based on GPS

PENG Chun-hua, JIANG Xin-hua

Abstract: This paper presented a communication solution of real-time operating data transmission system of moving locomotive by the existed train dispatching radio communication system, the railway packet switched network and GPS. It is pointed that the train dispatching radio, which is developed to add operating data to the analog voice transmission through data-voice synchronous transmission, and voice compressed and expanded techniques, can transmit the real-time information. The data can be shared by railway units with data warehouse. The system is feasible for medium and low speed data transfer.More>

2004, 4(2): 111-114.

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Parameter estimation on daily arrival distribution of waterway lock

LIAO Peng, ZHANG Wei

Abstract: The tonnages or barges of daily arrival at a waterway lock accord with normal distribution. The distribution parameters (mean and variance) were analyzed by using traffic survey. The relationship between the sample size and the precision of variance estimation was discussed, and the sensitivity of variance estimation on the calculation of daily arrival volume was analyzed. Analysis results show that when sample size is over 90, the deviation of variance estimation is mostly less than 5%, the theory is feasible.More>

2004, 4(2): 115-118.

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Algorithm of software digital down converter

FU Ce

Abstract: The paper put forward a design NCO (numerical controlled oscillator) with phase accumulation algorithm and fraction ratio decimation filter with mixing linear interpolation algorithm and CIC (cascaded integrator comb) filter, so that the DDC (digital down converter) process could be implemented in software on general purpose DSP (digital signal processing) chip and afford greater flexibility. Matlab simulation for a decimation filter whose decimation ratio is 29/31 was made. The results indicate that the algorithm improves the speed of DDC and implements programmable NCO and decimation filter by design software DDC with high performance DSP.More>

2004, 4(2): 119-122.

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Computer inspecting and managing system of railway dangerous goods transportation

LEI Ding-you, WEN Hui-chun

Abstract: The paper adopted the techniques, such as the theory of span development, distributed net communication, net security, database, data excavation, etc, to design the net analysissitus truss for the computer inspecting and managing system of the railway dangerous goods transport, set up the flow management of dangerous goods transport based on audit and the function system for transport duty audit based on attestation and authorization, and constructed mathematical model for matching loading and storage distribution of dangerous goods. The applied result shows that the system provides guarantee for the security of dangerous goods transportation.More>

2004, 4(2): 123-126.

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2004 Vol. 4, No. 2

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