2001 Vol. 1, No. 4

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On the Future Dedevelopment of Chinese Civil Aviation
YANG Guo-qing
Abstract: Based on the reviewing of chinese civil aviation development history and present situation, the role played by civil aviation in society and economics development is discussed, the development environment and development strategy targets at the beginning of 21 th century are analyzed. It is pointed out that the development of chinese civil aviation must be carried out on the basis of scientific and technical progress and the deepening of system reform.More>
2001, 1(4): 1-8.
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Research on Tilting Trains and Its Technology
LI Fei, FU Mao-hai, NI Wen-bo
Abstract: It is urgent to increase the running speed of trains and short travelling time of passengers in the development of railway transportation.To that end, many countries in the world have being developed railway systems of higher speed.But the cost of the engineering of higher speed railway is very high and the period of its construction is long.In order to tap the latent power of the existing ordinary railway lines further, many countries have being developed the techniques of tilting trains in the past two decades.Tilting trains are gradually put into operation on the existing ordinary railway lines.It is obvious that the use of tilting trains increases the capacities of transportation of the old railway lines and the running speeds much under the existing conditions that are not to be changed.Therefore the development and application of tilting trains is an effective method to increase the capacities of transportation of the old railway lines with less investments and quick returns on the investments.In this paper, the technique characters, development and application of tilting trains, and some research on technology about tilting trains are introduced in detail.More>
2001, 1(4): 9-14.
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On the Developments of Chinese Intelligent Railway System
YAN Yu-song
Abstract: The developments of Intelligent Transportation System (ITS) and the researches about Chinese Intelligent Railway System (CIRS) are presented.The basic formations and the general structure frame of CIRS are discussed.Furthermore, the basic characteristics and the advantages of CIRS are given and the key techniques of CIRS are pointed out.The application of GPS in CIRS is discussed.Some useful suggestions on developing CIRS are put forward.More>
2001, 1(4): 15-20.
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An Attitude Algorithm of Tilting Train Based on Math Platform
WANG Xue-mei
Abstract: Based on the measurement principle of tilting train, how to measure the un balanced acceleration is an important problem.The paper puts forward the attitude algorithm based on Math Platform, builds up the corresponding matehmatical model and researches its algorithm.More>
2001, 1(4): 21-24.
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The Spread Spectrum Technology Based Train Location
LIU Jin, WU Wen-qi
Abstract: This paper discusses the principle of train location based on spread spectrum technology. On the basis of this, the authors propose a rudimentary frame of the spread spectrum radio train location system, and compare it with the other train location methods in CBTC system.More>
2001, 1(4): 25-28.
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The Ability Improvement of Track Circuit Once Adjusting by Changing the Ratio of Release Voltage and Work Voltage of Track Relay
WANG Shan-qiang, CHENG Yin-hang
Abstract: A method for improving the ability of JZXC 480 track circuit once adjusting was presented. The method is to in crease the ratio of release voltage and work voltage of track relay. This method was simulated by computer. The results show that when the ratio is increased from 50% to 70%, the range of once adjusting track circuit is enlarged more.More>
2001, 1(4): 29-32.
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Road Performance of Waterproof Material for Concrete Bridge Decks
PEI Jian-zhong, HU Zhang-shun, ZHANG Zhan-jun
Abstract: Through analysis on performance requirements of asphalt pavement on concrete bridge decks, this paper presents two key properties of evaluating waterproof materials, including bond property and anti shear property.At the same time making use of pull out testing instrument and LLM testing system, the paper studies the influencing regularity of waterproof material, environmental temperature and the surface condition of concrete to the above two property, and presents scientific basis for design and construction of waterproof materials.More>
2001, 1(4): 33-36.
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Road Performance of Cement Stabilized Aggregate of Dense Framework Structure
HU Long-quan, JIANG Ying-jun, CHEN Zhong-da, DAI Jing-liang
Abstract: This paper, on the basis of summarizing the present research at home and abroad, puts forward that cement stabilized aggregate of dense framework type can decrease the shrinkage crack and raise the road performance of cement stabilized aggregate base course. Compared with the commonly used cement stabilized aggregate, the cement stabilized aggregate of dense framework type possesses better road performance.More>
2001, 1(4): 37-40.
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On Highway Technique Evaluation Method
JING Hong-jun, YAN Xi-li
Abstract: According to the situation that the highway technique evaluation method is fairly simple and not complete at present, the evaluation method system of the highway technique is developed. It chiefly includes the technique evaluations of highway net and highway function. The numerical value analysis methods such as fuzzy mathematics method and functional degree of importance method etc are utilized in the course of research, and this evaluation system is applied in practice, a good evaluation efficiency has been obtained.More>
2001, 1(4): 41-43.
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The Application of Engineering Database in Highway Design and Management
HU Xia-guang, WANG Bing-gang
Abstract: Through the analysis of the process of highway design and management, and combined with the research on Qinghai Tibet highway database, this paper promotes the constructing method of database for highway design and management.And this paper puts forward a Highway Computer Aided Engineering System (CAES) based on engineering database, and describes its functionality, structure and data management.The highway CAES, with the support of engineering database, provides a better way to solve the problems of information sharing and standardizing, system integration and opening.More>
2001, 1(4): 44-47.
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Analysis of Long-term Deflection of Reinforced Concrete Beams
WU Xiao-ping, SONG Yi-fan, HE Shuan-hai
Abstract: Considering the effect of shrinkage and creeping with the average shrinkage strain, and by aid of the curvature parameter k, this paper analyzes the mechanical characteristic of reinforced concrete section.Then a formula that can describe the relation of M and k is derived.According to the section stiffness of the RC beams, this paper gives the formulas to calculate the deflection of the beam at different stage.More>
2001, 1(4): 48-50.
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Dynamic Properties of Steel Pipe-encased Concrete Arch Bridge Effected by Its Materials
LI Yan-qiang, WU Lan-he, AN Rui-mei
Abstract: Based on the spacial finite elements theory and combined with the bearing capacity of arch bridge, the steel pipe encased concrete arch bridge was divided into a series of spacial beam elements and truss elements to establish its finite elements dynamic equations. With these equations, the effection of steel pipe encased concrete arch bridge's dynamic performance by the materials characteristics of steel pipe and concrete was studied.More>
2001, 1(4): 51-54.
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A View of Traffic Flow Theory
WANG Dian-hai, QU Zhao-wei
Abstract: This paper divides the history of traffic flow theory into different periods and summarizes the main content of the classical traffic flow theory.A new structure of traffic flow theory and the principle to study and to understand the theory are given.From the needs of transportation development and the support of science and technology, the paper analyzes the trend and the direction of traffic flow theory development.More>
2001, 1(4): 55-59.
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A Real Time Self-adaptive Traffic Signal Setting Optimization Theory
WAN Xu-jun, LU Hua-pu
Abstract: The mechanism of traffic flow in the urban traffic network is studied and a new optimization approach for signal timing in an intersection is proposed.This approach considers not only traffic waiting delay but also stops and start ups.Combining traffic delay?stops and start ups, a concept PI (Performance Index) and a model based on PI value are presented.Using this model, the signal timing can be optimized to reduce not only traffic waiting delay but also stops and start ups.More>
2001, 1(4): 60-66.
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Micro-model for Vehicle Behavior in Urban Intersection
ZHOU Guang-wei, YANG Xiao-guang
Abstract: In order to effectively analyze the traffic operation in urban intersection, the micro simulation model for the vehicle behavior is needed. According to the partition of the intersection area, the vehicle arrival model is presented. The departure model and conflict model are advanced under the condition of intersection with traffic conflicts or without traffic conflicts. The lane choice logic models in intersection are described in detail.More>
2001, 1(4): 67-70.
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The Uncertain Factor Method for Vehicle-velocity Estimate in Traffic Accident
YUAN Quan, LI Yi-bing, PEI Jian-ping
Abstract: There are many uncertain factors in a road traffic accident.According to these factors, the pre impact velocity of a vehicle can be estimated with some ucertainties. The Uncertainty Theory is utilized to calculate the uncertainty and extremum of the estimated velocity.From the factors mentioned above, a factor is selected as the uncertain factor, which has the most influence on velocity results.Then the uncertain factor is utilized to ascertain an error limit or a value scope of the vehicle velocity.The friction coefficient and the pre impact velocity of the impacted vehicle are considered as the uncertain factors, upon that the method is practiced in the algorithm of kinetic energy and momentum equation.More>
2001, 1(4): 71-74.
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Overview of Impact Models in Accident Reconstruction
PEI Jian-ping, WU Wei-dong
Abstract: The background and currents of traffic accident reconstruction in the world and popular impact models are presented in details. An outlook of the far reaching development is also put forward.More>
2001, 1(4): 75-78.
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Applications and Selecting Criteria of Modern Power Devices in Electric Vehicle
MA Xian-min
Abstract: The characteristics of power devices have great influence on performance of electric vehicle (EV).In this paper, the requirements of EV propulsion system for power devices are analyzed, the compared results of different devices are presented, and the criteria for selecting the power devices is introduced.More>
2001, 1(4): 79-82.
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A Methodology for the Determination of Emission Rates from Vehicular Pollutants on Highway in China
DENG Shun-xi, LI Bai-chuan, CHEN Ai-xia
Abstract: The on road vehicular emission factors were determined by monitoring the vehicle's pollutant concentrations in three highway tunnels in China, and by measuring the pollutant emission characteristics of typical in use motors on the chassis dynamometer.Based on the measured data, the pollutant emission factors of the classified type vehicles were solved using the linear optimization technology.The calculating formula of the linear source strength of CO, NOx and hydrocarbons (HC) as well as the parameter values in the formula were given.Finally, the reliability analysis of the vehicular emission rates, which was based on monitored pollutant concentrations, meteorological conditions and traffic fleet compositions on an existing express highway, shows that it has a good relationship between calculated and observed results.More>
2001, 1(4): 83-86.
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Motor Vehicles' Exhaust Emission Factors for Urban Transportation Planning
LI Xiu-gang, YANG Xiao-guang, WANG Wei, DENG Xue-jun
Abstract: In the paper, the methods for emission factors are analyzed.MOBILE parameters correction and computing methods are put forward to adapt China urban transportation planning. According to the actual conditions, MOBILE parameter correction can be utilized to compute emission factors that are adapted to urban transportation planning.The computed emission factors of Nanjing at present can be used for EIA of Nanjing and nearby cities.When average speed is between 30 to 75 km/h, the emission factors of CO, NOx and HC are less.So the pollution is less.More>
2001, 1(4): 87-91.
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The Operation and Administrative Control of Road Tolling in China
CAO Jun-nian, LI Xiao-ming
Abstract: The developing history of toll road in China is introduced. According to the conditions and features of toll road in China, the operation behaviours, goals and binding conditions of operator are analyzed. The principle and method for road tolling of government administration are studied.More>
2001, 1(4): 92-96.
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The Size and Location of Region Public Logistics Center
YUAN Qing-da, DU Wen, LI Qing-song
Abstract: This paper discusses the necessity and inevitability of developing the Region Public Logistics Center(RPLC) in China.This means the construction of RPLC will be beneficial to forming the logistics system with high efficiency and helping to manage and utilize the flow of information.Meanwhile, the mathematical model for optimizing the size and location of RPLC is put forward, and nonlinear programming techniques and queuing theories are used here.Finally, the genetic simulated annealing algorithm is utilized to solve the problem and an actual example is given respectively.More>
2001, 1(4): 97-100.
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Economics Analysis of Transporting Freights at High Speed and in Time
LI Xia-miao, ZHU Xiao-li, HU Si-ji
Abstract: According to the concern of production, circulation and consumption of merchandise, this paper analyzes the economical concern of transportation and circulation of goods, and proofs the necessity and significance of developing freight express system in China.More>
2001, 1(4): 101-105.
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Survey and Analysis on Transit Speed and Overdue Rate in Railway Freight Transportation
ZHU Xiao-li, LI Xia-miao
Abstract: Market economy has upper timing demands in railway freight transportation.According to the survey data in 1999, this paper analyzes and evaluates the timing serve level of railway freight transportation in four aspects such as local and through transporting, rate making distance, classes of goods and tariff numbers. It puts forward some measures, which include extending express trains, intensifying transportation organization, strengthening management of operation and expediting the information course, to solve the subsistent problems in order to improve the timing serve level of railway freight transportation.More>
2001, 1(4): 106-110.
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The Type Selection for Container Stack Gantry Crane in Waterway Port in West of China
LIU Gang, SONG De-xing
Abstract: Based on the technology and economy, this paper makes a discussion on the type selection for container stack gantry crane in waterway port in West of China. Besides the brief introduction to the construction of this kind of crane, it gives about 40 kinds of technical parameters for the rubber tired container stack gantry cranes in the world and analyzes the rule for the selection of these technical parameters, makes a decision on the type selection for this kind of crane in order to be useful for the development of container transportation in West of China.More>
2001, 1(4): 111-114.
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On Several Problems in Container Management
CHENG Yao-rong, YAN Bao-jie
Abstract: This paper illustrates the definition of container, and analyzes the problems of the container management in China. The concrete countermeasures are proposed to improve the container management in China.More>
2001, 1(4): 115-118.
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