西南交通大学学报

The Development and Prospect of Application of Light Rail Vehicles

LI Fu, ZHANG Li-ping, HUANG Yun-hua

2002, 15(2): 111-116.

[Abstract](1423)

Abstract:
Light rail traffic is becoming a favored city traffic system because of its less pollution to environment, saving energy, less investment, quick benefit and big freight volume. The technologies of urban light rail vehicles are developing quickly. In this paper, the development of urban light rail ve...

Dynamic Response of the Axially Moving Cable with Small Sag

LI Ying-hui, GAO Qing

2002, 15(2): 117-120.

[Abstract](1190)

Abstract:
Based on a mathematical model that describes the three-dimensional response of the axially moving cable with small sag and on the concept of wave propagation, an exact solution for the linear, in plane transverse vibration of the axially moving cable with general boundary conditions is obtained. The...

Numerical Simulation of Velocity Field of Flow Around Square Cylinder

TONG Bing, ZHU Bing, ZHOU Ben-kuan

2002, 15(2): 121-124.

[Abstract](1630)

Abstract:
Using the large eddy simulation (LES) and the finite difference method, a three- dimensional simulation of the velocity field of flow around a square cylinder at a Reynolds number of 22 000 is conducted. The N-S equation is split into advection step, diffusion step and propagation step with the time...

The Analysis of Delamination and Fracture in IC Packages

WANG Jun, YANG Fan, CHEN Da-peng

2002, 15(2): 125-128.

[Abstract](1537)

Abstract:
Micro-electronic components encapsulated with the high-polymer matrix composites are easy to be affected with damp. In the process of welding, the temperature and moisture often cause delamination and fracture in electronic components. For moisture and heat-sensitive high polymer materials, when con...

Evolution Equation of Viscoelastic Medium and Exact Solutions for Generalized Thermodynamic Forces

DAI Guang-ze, XIA Yan, ARAKI Shigetoshi

2002, 15(2): 129-133.

[Abstract](1209)

Abstract:
It is obvious that the exact solutions of the evolution equation, which is derived by regarding the deformation process of viscoelastic materials as an irreversible thermodynamic process, depend very much on the properties of their coefficient matrices. These matrices are usually affected by the nat...

Experimental Study on Welding of D6AC Ultra-high Strength Steel with Thin-Wire Tandem Sequence Submerged Arc Welding

ZHOU You-long, WANG Yuan-liang, HUJiu-fu

2002, 15(2): 134-147.

[Abstract](1465)

Abstract:
The weldability of D6AC ultra-high strength steel is analyzed, and the fundamental of tandem sequence submerged arc welding with thin-wire is introduced. Welding tests are carried out to study the procedure of D6AC ultra-high strength steel welding with the tandem sequence submerged arc welding tech...

Diagnosing the Power Distribution among Cylinders by Crankshaft Torsional Vibration

DONG Da-wei, YAN Bing, TAN Da-ming

2002, 15(2): 138-141.

[Abstract](1433)

Abstract:
A new approach using the average effective pressure of each cylinder to diagnose the power distribution of a multi-cylinder engine is developed, in which the average effective pressure of each cylinder is calculated from measured crankshaft torsional vibrations. Specifically, the transfer function b...

The Parallel Computation of Steady Navier-Stokes Equations with Bi-CG Iterative Method Based on EBE Technique

YANG Zhong-chao

2002, 15(2): 142-145.

[Abstract](1721)

Abstract:
The parallel Bi-CG iterative method based on the element-by-element (EBE) technique is described, which is used in the solution of Navier-Stokes equation using finite element method. This algorithm is implemented with MPI on the Shuguang 2000 parallel system in the National High Capable Computation ...

Research and Application of Wigner-Ville Distribution Algorithm

CHEN Chun-jun, XIAO Heng

2002, 15(2): 146-149.

[Abstract](1135)

Abstract:
An algorithm using FFT to calculate Wignev-Ville Distribution (WVD) is introduced. In view of the complexity of time frequency distribution numerical calculation of Wigner-Ville quadratic function, and the large amount of calculation by the algorithm, a sampling algorithm is put forward, by which th...

Simplification Method for Triangulation Net in Surface Reconstruction

TIANHuai-wen, WANG Jin-nuo

2002, 15(2): 150-153.

[Abstract](1226)

Abstract:
The simplification scheme for triangulation net formed by a lot of 3-D scattered data points is discussed. Removing faces plan is employed for the mesh simplification algorithm. Some simplification criterions of triangulation net are introduced, with the emphasis on the calculation method for the si...

Environmental Control Effect of Screen Doors in Subway

FENG Lian

2002, 15(2): 154-157.

[Abstract](1567)

Abstract:
Based on one-dimensional unsteady flow model, the velocity field of airflow and the temperature field in subway are simulated by use of the continuity equation, the motion equation and the convection-diffusion equation. For subway stations with screen doors and those without screen doors, analog com...

A Management Information System for Engineering Machinery

FENG Jian, JINHong-yun

2002, 15(2): 158-162.

[Abstract](1323)

Abstract:
The prototype of a management information system is built on VISUAL FOXPRO platform using the ActiveX technology for database. The prototype can be modified and improved by iteration according to requirements until a satisfactory and feasible system is formed. The developed system aims at the machin...

Multi-Level Interest Management for Distributed Virtual Environment

SUN Li-xin, ZHU Chang-qian, SUN Ge-wei

2002, 15(2): 163-166.

[Abstract](1417)

Abstract:
The multi-level interest management for distributed virtual environment can reduce network loads greatly, but it also increases the volume of data transmitted. Therefore, a novel network communication method is put forward. With the method, a dispatcher only need transmit a data package from the mul...

An Integrated Delivery Tracking System for E-Commerce

HE Rong, FANG Xu-ming

2002, 15(2): 167-171.

[Abstract](1313)

Abstract:
Based on the state-of-art of the e-commerce and logistics business in China, the design scheme of an integrated delivery tracking and inquiry system implemented by 3-level developing model is put forward. The key technologies such as design of database tables, information presentation and procession...

Real-Time Video Technologies for MS-Windows

YANG Tian-wu, LIU Rong, PENG Qiang

2002, 15(2): 172-176.

[Abstract](1382)

Abstract:
The features of three video technologies for Windows system,i. e., GDI, DrawDib function set and DirectDraw, are briefly introduced. The theory and implementation methods of image zoom through sampling rate conversion are also introduced. The executive efficiencies of the three video technologies ar...

Analysis of Earth Temperature Field Character and Prediction of Rock Temperature at Qinling Railway Tunnel

XIE Qiang, CHEN Yong-ping

2002, 15(2): 177-179.

[Abstract](1835)

Abstract:
Qinling railway tunnel is a long and deep-burying mountain tunnel with a length of 18 448 m and a maximum depth of 1.645 km. In this paper, considering the problems of high temperature that may probably exist in tunnel construction, the earth temperature field of the tunnel is simulated with FEM. Th...

Analysis of the Stability of Underwater Slope

ZHOU Shun-hua, LIUJian-guo, LI Yao-chen

2002, 15(2): 180-185.

[Abstract](1654)

Abstract:
For the underwater foundation ditch of the immersed tunnel excavated according to the plan of Nanjing immersed tunnel of high-speed railway crossing Yantze River, the head loss of the flow across the foundation ditch section is analyzed, and a high pressure district is obtained with the flow in the ...

Research on Fractal Characteristics of the Size-Distribution of Concrete Aggregates

XIA Chun, LIUHao-wu

2002, 15(2): 186-189.

[Abstract](1385)

Abstract:
The size-distribution of concrete aggregates is analyzed by using the principle of fractal geometry theory. The results indicate that the composition materials of concrete have many obvious fractal phenomena, and hence the fractal theory can become a new effective approach to researches on concrete....

Discussion on Methods for Calculating Bearing Capacity of Tension Piles Set into Rock

WUXing-xu, YUZhi-qiang, ZHUANG Wei-lin

2002, 15(2): 190-194.

[Abstract](1394)

Abstract:
Based on the results of model tests and analysis of the failure-modes of tension piles set into rock, the existing formulas for calculating the bearing capacity of tension piles are researched. An improved formula is put forward, and the relative parameters in the new formula are also proposed. Fina...

Research on the Length of Plastic Hinge of Partially Prestressed Beams

PU Qian-hui, YANG Yong-qing

2002, 15(2): 195-198.

[Abstract](1418)

Abstract:
In order to study the length of the plastic zone in a PPC beam, a series of simply supported beam and continuous beam models were tested. The test results showed that the occurrence of the plastic hinge is postponed by the increase inRPPCat the middle span and between the intermediate supports, and ...

Research on Scaling Properties of the Variation of Flood Volume with Duration

CHANG Fu-xuan, DING Jing, WANG Wen-sheng

2002, 15(2): 199-203.

[Abstract](1088)

Abstract:
Using the flood data from three hydrologic stations in the Yangtze river, the temporal scaling properties of flood volume is studied with scaling theory. The results demonstrate that the variation of annual maximum flood volume with duration has a simple scaling property in a certain period of time....

Iterative Algorithm for Fluid-Structure Coupling System Based on Improved Wilson-θMethod

YAN Qi-xiang, LIUHao-wu, XIA Chun

2002, 15(2): 204-208.

[Abstract](1677)

Abstract:
An improved Wilson-θmethod is obtained on the basis of the traditional Wilson-θmethod and its stability is analyzed. From the improved Wilson-θmethod, an iterative algorithm for solving the dynamic coupling equation is derived. The algorithm can be used to solve the dynamic reaction of fluid-structu...

A New Kind of Minus-Pressure Air Flotation Equipment

OUYANG Feng, LI Gang, FU Yong-sheng

2002, 15(2): 209-211.

[Abstract](1233)

Abstract:
The mechanism of a new air flotation equipment with an air-water mixing chamber is explained. The removal efficiency of the equipment is determined under experimental conditions. For substances such as petroleum and suspended solids(SS), the removal efficiency is more than 95%. The experimental data...

The Second-Order Nonlinear Susceptibility in Semiconductor Asymmetric Step Quantum Well Structure

WEN Cheng-zhong, DOU Yu-huan

2002, 15(2): 212-214.

[Abstract](1154)

Abstract:
The characters of asymmetrical step wells are studied. The resonantly enhanced second- order susceptibilityχ(2)2ωis calculated, and the changes ofχ(2)2ωwith the width of the wells, the width and height of the step, the barrier width and the wave length of incident light are given. The obtained resul...

Reducing Technique for Two Dimensional EM Scattering Problem with Single Axis Symmetric Structure

GUAN Zhen-hong, ZHU Feng

2002, 15(2): 215-217.

[Abstract](1398)

Abstract:
Big storage and long calculation time requirements are main obstacles for the development of moment method. Therefore, how to efficiently use geometric symmetric feature of scattering structures to reduce computer storage and calculation time for solving the scattering problems is significant in the...

A Game Model for Joining in Supply Chain

CHEN Yan-ru, JIANG Yang-sheng, PU Yun

2002, 15(2): 218-222.

[Abstract](1523)

Abstract:
Supply Chain (SC) is a new relationship pattern among enterprises, and Supply Chain Management (SCM) is for this relationship essentially. Only after the research of this relationship is deeply done can the problems existing in the development of SCM be well solved. In this paper, a model for joinin...

Solving Flight Conflict Problem with Network Flow Model

SUNHong

2002, 15(2): 223-226.

[Abstract](1387)

Abstract:
Flight-connecting schedule is the basis of making routine production plan of airline operation for airline companies. In this paper, according to the structural characteristics of single hub and spoke flight network, a bipartite graphic model and its optimization algorithm are developed for flight c...

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2002 Vol. 15, No. 2