西南交通大学学报

Study on the Distribution Patterns of Time Headway of Vehicles

LUOXia, DUJin-you, HUO Ya-min

2001, 14(2): 113-116.

[Abstract](1595)

Abstract:
Taken mixed traffic flows as the basic constitution of high ways, the combinatorial probability of following sequences of mixed traffic flows is analyzed. The relationship between vehicle speeds and the maximumtime headway and that between the minimum time headway and randomness of traffic flows are...

Network Flow Models for Organization of Transship Trains in Railway Terminals

YAN Yu-song, ZHUSong-nian, DUWen

2001, 14(2): 117-120.

[Abstract](1530)

Abstract:
Accordingto the basic properties of network flows and the analysis of the organization of transship trains in railway terminals, a method to construct the model for the organization of the transship trains is proposed. The organization problem is converted to an optimization problem of point, arc an...

An Application of Calculation of Corridor OD Flows

SHUAIBin, QINGXue-jiang, HUO Ya-min

2001, 14(2): 121-125.

[Abstract](1251)

Abstract:
Traffic flow investigation is an important step in the traffic planning. In this paper, the relationship between corridor OD flows and section flows is analyzed, and a method is proposed to calculate corridor OD flows via road section flows. The procedures to divide bi-directional flows into two sin...

Analysis and Application of RF Transmission in Electric Railway Tunnels

WEI Yong-an

2001, 14(2): 126-130.

[Abstract](1474)

Abstract:
RF transmission in electric railway tunnels is studied based on the characteristics of the tunnel walls and the fact that there are catenary and rails as paths of signals. The RF frequency, its propagation mode and the calculation of the electric field are analyzed. As an example, application of the...

A Mobile-Location Based Dynamic positioning Algorithm

DengPing, Fan Pingzhi

2001, 14(2): 131-135.

[Abstract](1404)

Abstract:
In this paper,a mobile location-based dynamic positioning algorithm is proposed based on measured time of arrival(TOA). This algorithm can be used in cellular networks to estimate mobile location from mobile radio TOA information detected by several base stations(BS). The BS numbers and the correspo...

Analysis on the Characteristics of Generalized Congruence Neural Networks with an Improved Algorithm

HUFei, JINFan

2001, 14(2): 136-139.

[Abstract](1567)

Abstract:
An improved learning algorithm for GCNN is proposed and presented in this paper based on a study on the characteristics of GCNN. In addition, a comparison between GCNN and the currentwide used BP net algorithms is performed. Computer simulation using concrete examples shows that the suggested algori...

Modeling and Simulation of Three-Phase Asynchronous Motors

GENG Biao, XIEHong-ji, RENGuang

2001, 14(2): 140-143.

[Abstract](1497)

Abstract:
Amodel forthree-phase asynchronousmotors, which is in a static coordinate system, is proposed to develop a vector control system for three-phase asynchronous motors. The hardware and software of the simulating system are discussed in detail. The parameters of an actual motor are taken for the simula...

Dynamic Characteristics of Gantry Cranes with an Elastic Trolley Frame

CHENG Wen-ming, DENG Bin, WANGJin-nuo

2001, 14(2): 144-148.

[Abstract](1349)

Abstract:
Unlike conventional dynamic calculation inwhich rigid models are used, a serial elastic model of three masses and three degree of freedoms for the trolley frame of container gantry cranes is proposed by taking the large span of the trolley beam into consideration. The precise solutions to the vibrat...

Experimental Research on Dynamic Characteristics and Coupled Vibration of a Maglev Train System

TANGHuai-ping, GAO Fang-qing

2001, 14(2): 149-152.

[Abstract](1567)

Abstract:
In this paper, the results of dynamic test conducted on a scaled model of a maglev train system are presented. The resonant characteristics of the sub-structures of the maglev train system, the structural dynamic responses at levitated and running state, coherence of the levitated train body, the va...

A Study on Dynamic Characteristics of Vibrators in Concrete Stirring Bars

SHENHuo-ming, GAO Shu-ying, SHUBin

2001, 14(2): 153-156.

[Abstract](1330)

Abstract:
Amechanical model for concrete stirring bars is proposed and its fourth-order partial differential equation is derived. The bars are idealized to free-free beams with lumped mass. The corresponding frequency equation is also derived from the solutions to the differential equation, the boundary condi...

Finite Element Analysis for Shape Memory Alloys

LIUAi-rong, PAN Yi-su, ZHOUBen-kuan

2001, 14(2): 157-151.

[Abstract](1645)

Abstract:
Based on an existing constitutive model of shape memory alloys, a formulation of incremental finite element is derived and the calculation is done on a computer. Numerical examples of a rod and an infinite panel with a circular hole, both under uniaxial tension, are analyzed with the derived formula...

Mapped Infinite Element for Three-Dimensional Intercalations

SUGuo-shao, DUANHai-juan, YANLiu-bin

2001, 14(2): 162-165.

[Abstract](1187)

Abstract:
A model and its formula of 3-D 10-node mapped infinite element for intercalations in rock engineering are proposed. In comparison with the ordinary finite element simulation, with this model the time for data preparation and CPU time are effectively reduced, and higher computational accuracy is achi...

Research on Prediction of Noises of High Speed Railway Bridge

WANG Zhong-shi, WANG Feng-qin, GAO Shu-ying

2001, 14(2): 166-168.

[Abstract](1714)

Abstract:
In this paper, the statistical energy analysis (SEA) is applied to prediction of the noises of high speed railway bridges. Based on analysis on the relationship between the principle of SEA and production of noises of high speed railwaybridges, SEA is considered as a feasible method for predictingno...

Analysis on Dynamic Loads on Ballast of Shenzhen Subway

LI Cheng-hui, YUJin-jiang, QIUWen-ge

2001, 14(2): 169-171.

[Abstract](1885)

Abstract:
According to the model of coupled vibration of vehicle and tracks, the dynamic loads of ballastof Shenzhen subway are calculated in both frequency and time domains. The relationship between dynamic loads and track irregularitywavelengths are obtained. The maximumdynamic load is about80 kN/mmatthe wo...

An Elastic-Plastic Finite Element Analysis on Tunnel Structures at Cycled Temperatures

ZUO De-yuan, ZHENGAn-qi

2001, 14(2): 172-175.

[Abstract](1625)

Abstract:
An analysis is conducted The excavation and lining of a tunnel structure are analyzed with numerical calculation. Then, according to the principle of unstable heat transfer, the properties of local concrete linings of the tunnel in the condition of cycled temperatures are studiedwith elastic-plastic...

Geogrid-and Geocell-Reinforced Sand Blanket: Model Test and the Ability to Reduce Deformation

SUQian, CAI Ying

2001, 14(2): 176-180.

[Abstract](1602)

Abstract:
In this paper, amodel teston soft subsoil confinedwith sand blankets reinforced bygeogrids and geocells is presented. The ability to resist deformation of the subsoil is discussed in detail. The sand blankets distribute the load effectively, so that the value ofK30is remarkably increased by over 57%...

Analysis on the Effect of Stresses on Corrosion of Reinforcing Steels

DANDan-hui, HE Guang-han

2001, 14(2): 181-184.

[Abstract](1530)

Abstract:
In accordance with the corrosive dynamics of reinforced concrete and chemico-mechanical principles of metallic corrosion, the influence of stresses in reinforcing steels on corrosive reaction velocity under the condition that there is no crack in the concrete is analyzed. It is confirmed by calculat...

A Model Test on the Anchorage Zones of the Second Nanjing Changjiang River Bridge

CHENWei-qing, ZHANG Qiang

2001, 14(2): 185-189.

[Abstract](1753)

Abstract:
Amodel teston the anchorage-boxof the SecondNanjing ChangjiangRiver Bridgewas conducted at the Center of Structural Engineering Experiment of Southwest Jiaotong Universiy. The safety of and the detailed stress distribution in this structure, and the reliability of the connection between the anchorag...

Feasibility of Directly Utilizing GPS Baseline Vectors in Local Engineering Networks

GONGTao

2001, 14(2): 190-194.

[Abstract](1310)

Abstract:
Due tothe difference betweenWGS-84 and local ornational reference systems, such as BJ-54 (Beijing System of 1954), coordinate transformation is necessary before GPS results are utilized for local engineering control. However, the transformation depends on the accurate national geodetic control point...

A Study on Buffering Analysis of GPS in Map Matching Applications

WUXu-yan, LUO De-an

2001, 14(2): 195-198.

[Abstract](1389)

Abstract:
GPS and GIS arewidely used in vehicle control and navigation systems. Both of them, however, have system and random errors that can lead a vehicle navigation system to failure. Fortunately, map matching technique can create a bridge between GIS and GPS to prevent the failure to some extent. However,...

Losses of Bessel-Gaussian Beams Propagating through a Hard-Edge Aperture

WANGLi

2001, 14(2): 199-201.

[Abstract](871)

Abstract:
The losses Bessel-Gaussian beams, a kind of non-diffracting beam, propagating through a hard aperture are studied, and ageneral formula is derived. As an example of applications, numerical calculation is performed to calculate the losses of Bessel-Gaussian beams propagating through a circular apertu...

Single Toroidal Non-Reciprocal Ferrite Phase Shifters

FENG Quan-yuan, RENLang

2001, 14(2): 202-205.

[Abstract](1149)

Abstract:
The single toroidal non-reciprocal ferrite phase shifterthat is the key components of a phase array antenna is studied to develop the phase array antenna for autotracking synchronous communication satellite. The transcendental equation for the single toroidal non-reciprocal ferrite phase shifter is ...

Self Organizing Methods and a Model Study on the Growth of West China’s GDP

KANG Yin-lao, YANKe-qi

2001, 14(2): 206-210.

[Abstract](1461)

Abstract:
On the basis of the theory of self organizing cybernetics, a new data mining method is proposed by using the principles of artificial neural networks. During modeling, active neurons are generated and eliminated largely, enabling the model to evolve into its optimal complex. Some principles, process...

A Heuristic Genetic Algorithm for the Travelling Salesman Problem with Time Restraints

XIEBing-lei, LIJun, LIUJian-xin

2001, 14(2): 211-213.

[Abstract](1475)

Abstract:
As an extension of the travelling salesman problem, the travelling salesman problem with time windows is a very difficult problemwith great theoretical and practical significance. In this paper, the time restraints are converted intoobjective restraints, and genetic algorithmswithmutations by2-excha...

Analysis on the Chaotic Motions of Some Nonlinear Dynamic Systems

YEJian-jun, CHENQiu

2001, 14(2): 214-216.

[Abstract](1343)

Abstract:
The conditions for chaotic motions of some dynamical systems with nonlinear structures are studied in this paper. The relationship between existence of Smale horseshoes and mechanical system parameters is obtained by applying the Melnikov analytical method.

Notes on the Factorizations of Compact and Weakly Compact Operators

JIN Yu-guang, CHENZi-li

2001, 14(2): 217-219.

[Abstract](1247)

Abstract:
This work is devoted to the factorization problems for compact and weakly compact operators between Banach lattices. Under the same known conditions, a more symmetric formof factorization theorem is approved for compact and weakly compact operators between Banach lattices through reflexive Banach la...

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2001 Vol. 14, No. 2