西南交通大学学报

Behavior and Earth Pressure of the Retaining Piles with Anchors for Deep Excavation

XIA Yong-cheng, DONGDao-yang, HUMin-yun

2000, 13(2): 111-115.

[Abstract](1408)

Abstract:
The deep excavation engineeringof the Overseas Exchange Centerof Chengdu takes a structure of retaining piles that use anchors and have ring beamto join the tops of the piles. In this paper, based on the measured reinforcement stresses in the piles during the foundation pit’s excavation, the corresp...

Permanent Deformation of Subgrade Soils in Flexible Pavement

QIUYan-jun, SUNZhen-tang

2000, 13(2): 116-120.

[Abstract](1384)

Abstract:
A practical method for calculating permanent deformation of subgrade soils in flexible pavements is proposed. Based on the general principle that stress analysis and strain calculation are not integrated through the rigorous constitutive matrix in the design and analysis of flexible pavements, a per...

An Experimental Study on the Self-Organized Criticality of Sand Pile Model with One-Grade Slope

LI Yuan-fu, YAOLing-kan, DENG Yu-cai

2000, 13(2): 121-125.

[Abstract](1260)

Abstract:
The sand pile model can serve as a paradigm for self-organized criticality. This paper reports an experimental study on the sand pile model with semi-boundless collapsed loose slope under inclined plane. Experimental results indicate thatthe self-organized criticalityof a sand pile is related to the...

Self-Vibration Characteristic Test of Long-Span Bridges by Means of Environment Random Excitation

TANGHuai-ping, WANG Feng-qin

2000, 13(2): 126-128.

[Abstract](1448)

Abstract:
Structural self-vibration characteristic test is one of the most important contents of long-span bridge quality evaluation. In this paper, a quick and reliable method of environment random excitation is proposed for self-vibration characteristic test. Based on the theory of IDTmodal parameter identi...

Experimental Research on Limit Torque of RC Members under the Combined Action of Axial Tension and Bending Twisting Moment

DUZan-hua

2000, 13(2): 129-132.

[Abstract](1226)

Abstract:
According to the experimental results of limit torque in eight RC structural members under the combined action of axial tension and bending twisting moment, the author studies the damage forms of the members, the stress-strain variation law of the longitudinal and the crossed steels. Based on the th...

A Study on Crack Resistance of Subway Station Top Floor during Construction

ZHANGJie

2000, 13(2): 133-136.

[Abstract](1177)

Abstract:
The cause of subway station top floor cracking during construction is analyzed, and the tempera- ture stresses ofthe monitoringsection are computed usingthe practical test data. It is pointed outthat during construction the hydration heat will not cause the subway station top floor to crack, and tha...

Experimental Study on the Wall Jet in Defined Space during Tunnel Construction

LIGang, YANGMin, HUANG Ru-qin

2000, 13(2): 137-140.

[Abstract](1525)

Abstract:
The purpose of this paper is to studythewall jet in defined space duringtunnel construction. For two-dimensional wall jets in defined space, through a lot of experiments and theoretical analyses it is con- cluded that: (1) the flowfield ofwall jet in defined space can be categorized as thewall jet z...

A Study on the Fractal Interpolation of Topographical Data

ZHANG Shan-shan

2000, 13(2): 141-144.

[Abstract](1155)

Abstract:
The Fundamental concepts of fractal, iterated function system (IFS) and fractal Brownian motion (FBM) are described briefly. The fractal interpolation methods of topographical data based on IFS and FBM are introduced, and some concrete algorithms and practical examples are presented.

Application of a New Type of Punched Agitator to Phosphoric Acid Reaction

OUYang-feng

2000, 13(2): 145-147.

[Abstract](939)

Abstract:
The production techniques and reaction device of producing phosphoric acid by wet process are introduced. A newtype of agitator applicable for phosphoric reactors is presented, and its operation perfor- mances in phosphoric acid reactors are discussed from the reaction mechanism. It is thought that ...

Admittance Characteristics of Wheelset under High Frequency Excitation

WEI Wei, ZHAI Wan-ming

2000, 13(2): 148-151.

[Abstract](1707)

Abstract:
The admittance characteristics of four kinds of Chinese wheelsets under high frequency excitation are analyzed. Results showthat the highest admittance is in the axial (i.e., lateral) direction ofwheelset spoke, and the main way to reduce the high frequency vibrations is to reduce the wheelset spoke...

A New Index for Ride Quality Analysis of Automobiles: the Coefficient of General Vibration

DUZi-xue

2000, 13(2): 152-157.

[Abstract](1245)

Abstract:
This paper puts forward a newindex: the coefficientofgeneral vibrationCgv—for evaluating au- tomobiles’ride quality. Taking a Changan bus as an example, it presents the methods of determining the weighted coefficients of velocity, location, road proportion and anthropological factor,etc., which are ...

On Measuring Methods for Parameters of Car Body

CHENJian-zheng, ZHANG Wei-hua, CHENLiang-qi

2000, 13(2): 155-159.

[Abstract](3987)

Abstract:
Based on the discussion of the significance of measuring the car bodies dynamic parameters of railway vehicles, the methods tomeasure a car body sweight (mass), center of gravity and moment of iner- tia are proposed. The advantages and feasibilityofthese methods are analyzed and compared, and the ca...

Visualization of Computing Model of Locomotive Dynamics

DING Guo-fu, WANGJin-nuo, WUPing-bo

2000, 13(2): 160-163.

[Abstract](1793)

Abstract:
A locomotive dynamics simulation systemgenerally consists of model building, model calculation and model display. This paper puts forward a CAD method that is based on three-view drawing. In this method, the initial data chains of a locomotive dynamics simulation model can be visually attached to a ...

A Study on the Development Platform of Dynamic Graphic Simulation System for Locomotive Circuits

TANG Zhi-hui, CHENHua-bin, ZHOUMei-yu

2000, 13(2): 165-169.

[Abstract](1378)

Abstract:
The current computer dynamic graphical simulation systemwhich simulates the locomotive circuit process is only used fortrainingtrainees, and cannot be used bythe designerof locomotive electric circuits. Moreover, because of the rapid change of locomotive types, the designers have to repeatedlywrite ...

A Design Basis for Collector of Maglev Trains

HUJi-shi, PANHui-long

2000, 13(2): 170-173.

[Abstract](1750)

Abstract:
The Maglev train drived by short-stator linear motor acquires power from conductor rail through contacting collector. This paper, based on the analysis of the motion characterof theMaglev train, puts for- ward a main design basis for the Maglev train collector. This design basis is applied to the co...

Distance Properties of Turbo-Codes and Viterbi Decoding Method

ZHANG Zhong-pei, JINFan

2000, 13(2): 174-178.

[Abstract](1171)

Abstract:
Turbo-codes are produced by parallel concatenation of recursive systemic codes (RSC), and its excellent performances are analyzed based on the free distance and bit error rate of the RSC codes. Adiago- nal interleave method is proposed based on the distance properties ofTurbo codes. With losing litt...

An Algorithm for Coding of High Digital Audio

WANG Bei-bei, TANGMengGANPing

2000, 13(2): 179-182.

[Abstract](1311)

Abstract:
An enhanced DCTalgorithmwith real-time characteristics is put forward; and a coding algorithm of high quality is obtained by combining the enhanced DCT and a hybrid filter-bank. The proposed coding algorithm improves the adaptability of the filtering transform block length, the filtering properties ...

Prefilter Selection Methods in Fast Algorithm of Discrete Wavelet Transform

HE Zheng-you, DAIXiao-wen, QIANQing-quan

2000, 13(2): 183-187.

[Abstract](1211)

Abstract:
The fast algorithm of discrete wavelet transform (DWT) ensures that the wavelet transform is widely applied in signal processing. In the algorithm, the computation of values on sample space is very important. This paper, based on the discussion of several fast DWT algorithms, is focused in the compu...

The Effect of Fiber Aspect Ratio on the Mechanical Behavior of Aligned Short Fiber Composites

KANG Guo-zheng, GAO Qing

2000, 13(2): 188-191.

[Abstract](1497)

Abstract:
Based on the single fiber axisymmetrical and three dimensional models of an aligned short fiber reinforced metal matrix composite, the effect of varied fiber aspect ratio on the mechanical behavior of this composite is analyzed by the elasto-plastic finite element method. The studies are focused on ...

An Open Hypermedia CAI System

LIUPing

2000, 13(2): 192-195.

[Abstract](1310)

Abstract:
Based on the discussion of shortcomings of the close CAI, this paper proposes away to create an object-oriented open hypermedia CAI system, and describes the general thoughts, main functional modules and keytechniques of buildingthis open hypermedia CAI systemusingthe object-oriented programdesignin...

Optimal Model and Algorithm for Feasibility of Station Arrival-Departure Requirement of Train Operation Plan

ZHAO Qiang

2000, 13(2): 196-200.

[Abstract](1544)

Abstract:
Station arrival-departure capacity is one of the important parts in computer aided making train diagram. In this paper, around trains crossing and overtaking plan, the main reasons that cause the shortage of station arrival-departure capacity on single-track railway are systematically analyzed; a li...

Night Vision and Driving Safety of Drivers

JINJian

2000, 13(2): 201-203.

[Abstract](1434)

Abstract:
In this paper, automobile drivers are divided into two groups; one is called accident group every member of which has ever had more than 2 accidents; and the other one is called non-accident group the member of which has never had an accident. The testing method for drivers’night visions is studied,...

Study on the Random Errors in Markovian Decision-Making Planning

DIAO Ming-bi

2000, 13(2): 204-208.

[Abstract](1339)

Abstract:
Combined with practices, the theories and methods ofMarkovian randomprocess, the creation of transition probabilitymatrix and the calculation of stable state probability are concisely described. Consider- ing that in Markovian decision process, a great number of random factors lead to the distortion...

On ITS Structure

ZHANGDian-ye

2000, 13(2): 208-211.

[Abstract](1358)

Abstract:
This paper is concernedwiththe theoryof intelligenttransportation system(ITS), and focused on itsmain structure and research contents. In seeking the way to build an ITS structural model, peoples, vehicles, roads and environments are organically united by a technique group to be a traffic system, wh...

Stochastic Decision Trees

YANGNing, ZHAOLain-wen, GUO Yao-huang

2000, 13(2): 212-215.

[Abstract](1261)

Abstract:
The relationship between the utility value of a decision project and the time spend in a particular state is discussed in this paper. The concept of stochastic decision trees is introduced, and using semi- Markov process theory, the representation of stochastic decision trees is given. Furthermore, ...

A Management Planning Optimal Model for Goods and Materials Enterprises

LI Zong-ping, LIUHai-yan, YEHuai-zhen

2000, 13(2): 216-219.

[Abstract](1470)

Abstract:
Based on the management characteristics of goods and materials enterprises, and through the planning process analysis of management decisions, an optimal model is built for making management plans to process the manifold goods, discounted prices, changeable market demand and management flexibility. ...

Statistics Analysis on the Relationship of Highway Net Density with Population Density and Per Capita GNP in National Region

SUNGen-nian

2000, 13(2): 220-223.

[Abstract](1343)

Abstract:
The relationship of the highway net densitywith the population density and per capita GNP in a national region is analyzed by use of the section data of three different times, and it is found that among them there exists a stable mathematical relation and a statistics law. Considering that the highw...

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2000 Vol. 13, No. 2