西南交通大学学报

Rail Corrugations: Influencing Factors and Retarding Measures

LIUXue-yi, YING Hong

2002, 15(5): 483-487.

[Abstract](1451)

Abstract:
Based on the formation theory of rail corrugations caused by slip-stick vibrations of wheel- sets, an emphatic analysis and summary are made of the influencing factors of corrugations from the aspects of track conditions, bogie structures, contact performances between rail and wheel, and operation c...

Dynamic Performance of Clayey Railroad Subgrade

ZHONG Hui-hong, TANG Kang-min, HUANG Mao-song

2002, 15(5): 488-491.

[Abstract](1473)

Abstract:
A series of tests are conducted in laboratory and field to investigate the behavior of compacted clayey railroad subgrade subjected to repeated loading of to-and-fro trains. Using the test results, the stress-strain behavior of the subgrade was quantitatively studied, and the causes of diseases in s...

Dynamic Design Method for Friction Pile with Prestressed Cable

LIUXiao-li, ZHOU De-pei, YANG Tao

2002, 15(5): 491-495.

[Abstract](1590)

Abstract:
A concept of dynamic design method for friction pile with prestressed cable is put forward. First, the internal forces of the pile and cable are calculated according to the pile s working conditions. Then, the greatest internal forces obtained are taken as criteria to design the pile s structure and...

Reliability Analysis of Wing Wall Tunnel Portal

LI Lun-gui, GAO Bo

2002, 15(5): 496-499.

[Abstract](1957)

Abstract:
According to the structure reliability theory and considering the indefinite factors such as the stratum unit weight, the subbase friction coefficient, the base control press stress, the concrete unit weight, etc. a reliability analysis of wing wall tunnel portal structure is made by use of one- ord...

Model Test of Two Span High-Strength Concrete Continuous Beams with External Prestress

LI Fang-yuan, ZHAO Ren-da, ZHOU Yi-yun

2002, 15(5): 500-504.

[Abstract](1439)

Abstract:
Four different high-strength concrete continuous beams are designed with different external prestresses and made of different concrete materials (high-strength concrete or steel-fiber- reinforced high-strength concrete), and tested under static load to study their structural behaviors. The test resu...

Internal Force Distribution of Nielsen Style X-Style Arch Bridge

TIANXue-min, LI Qiao, ZHANG Qing-hua

2002, 15(5): 505-509.

[Abstract](1645)

Abstract:
A study is made on the distribution regularities of internal forces of Nielsen style concrete-filled steel tubular tied arch bridges under different loads such as distributed force, concentrated force and live load. The results are compared to those of Lohse style arch and parallel rib arch. Model t...

Carrying Capacity and Travelling Speed on Speed-up Single-Track Lines

PENG Qi-yuan, YANHai-feng, YIN Yong

2002, 15(5): 510-514.

[Abstract](1692)

Abstract:
In order to provide a theoretical basis for running speed-up trains on single-track railways in China, an analysis is made of the influence of running speed-up trains on the carrying capacity on speed-up single-track lines. A calculating model for speed-up trains coefficient of deduction is develope...

Reasonable Number of Passenger Trains Operated on Single-Track Railway

YANHai-feng, PENG Qi-yuan, LIU Yan-lin

2002, 15(5): 515-519.

[Abstract](1664)

Abstract:
In single-track railway sections, there is a close relationship between the traveling density of passenger trains and their traveling speeds. In this paper, an in-depth analysis is made of the crossing, overtaking behaviors, and traveling speeds of passenger trains on single-track railways, and a ge...

Design of the Assistant Decision System for Train Operation Adjustment

CUI Xian-bo, YANHai-feng

2002, 15(5): 520-525.

[Abstract](1756)

Abstract:
The assistant decision system for train regulation is a key link of train operation adjustment auto-control system. Based on analysis and design of the workflow and components of the system, a mixed 0-1 linear programming model for train operation adjustment is built. Against the disadvantages of th...

Dispatcher s Supervision System with Integrated Positioning Technology on Single-Track Railway

XIANG Dong, GU Yan

2002, 15(5): 526-530.

[Abstract](1429)

Abstract:
The proposed dispatcher s supervision system for single-track railway comprises positioning, communication, map matching functions and some necessary auxiliary functions. Generaly, the positioning of trains on single-track railway can be implemented using a train positioning system integrating GPS, ...

A Genetic and Simulated Annealing Algorithm for Optimal Sequential Casing of Less-than-Carload Freights

BU Lei, YIN Chuan-zhong, PU Yun

2002, 15(5): 531-535.

[Abstract](1514)

Abstract:
From the angle of reducing searching region, strengthening convergence and shortening calculating time, the simulated annealing idea is introduced into the genetic algorithm to solve the optimal sequential casing problem of less-than-carload freights in containers. The specific process for realizing...

A Genetic Algorithm Based on Uniform Design Paralleled with Genetic Operation

ZHANG Zhi-yuan, HE Chuan

2002, 15(5): 536-340.

[Abstract](1840)

Abstract:
Simple genetic algorithms have poor stability, for they are prone to premature convergence. In order to overcome this disadvantage, a novel algorithm is proposed using a combination of uniform design and genetic operation. A mapping between the solution space of problems and the search space of the ...

An Algorithm of Joint Adaptive Multi-User Detector

LIU Wei, ZHU Chang-qian

2002, 15(5): 541-543.

[Abstract](1170)

Abstract:
Considering that traditional adaptive multi-user detectors haven t made full use of the character of multi-access signals, a new algorithm of joint adaptive multi-user detection is put forward. In this algorithm, the received signal is used as the reference signal, and the input of adaptive filter c...

Deterministic Interleaver Design for High-Rate Turbo Codes

SHI Zhi-ping, JIN Fan

2002, 15(5): 544-547.

[Abstract](1195)

Abstract:
Interleaver design plays an important role in Turbo code theory, and high-rate turbo codes have some special requirements on interleavers. Based on analysis of five key factors which have influences on the design of interleavers, a study is made on how to design a promising interleaver for turbo cod...

Fault Detection of Subway Feed Line by Means of Wavelet Transform

ZHANG Xiu-feng, GOU Shao-bo

2002, 15(5): 548-552.

[Abstract](1455)

Abstract:
A comprehensive analysis is made of the characteristics of the traction current, pickup current and fault current of subways. It is shown that the protection performance caused by differential current increment is mainly determined by the separation effect of current increment, the current change ra...

Time-Optimal Control Based on Evolutionary Programming

ZHANG Yi, FENG Chun, HUPeng-fei

2002, 15(5): 553-556.

[Abstract](1404)

Abstract:
An evolutionary programming (EP) based method for solving constrained time-optimal control problems is proposed on the basis of an analysis of the advantages and disadvantages of the existing algorithms, and a mathematical model is developed. In this model, the fitness function is constructed by inc...

Semantic System of Lattice-Valued Propositional Logic Based on Finite Lattice Implication Algebra

MAJun, QIN Ke-yun, XU Yang

2002, 15(5): 557-560.

[Abstract](1209)

Abstract:
With the finite lattice implication algebra being the range of true values of a logic system, a semantic system of lattice-valued propositional logic based on the finite lattice implication algebra is built. Some basic definitions, such as the valuation of the system and the satisfiability of formul...

Linear Approximation Algorithm for Bilinear Programming

CHEN Gao-bo, LIUHai-yan, SHANG Sheng-wu

2002, 15(5): 561-564.

[Abstract](1508)

Abstract:
A discussion is made of the optimization of a bilinear programming. The bilinear programming is converted into a max-min problem on the principle of duality, and a linear approximation algorithm for the max-min problem is presented, which proves to be convergent in finite steps. It is also shown tha...

Input Resolution on Horn Sets Based on Fuzzy Neural Networks

PEI Zheng, HUANG Tian-min

2002, 15(5): 565-569.

[Abstract](1443)

Abstract:
Resolution principle of automated reasoning has been used in many aspects of artificial intelligence, and many modified methods have been proposed. In the modified methods, input resolution is one of good reasoning methods, and it is complete for Horn sets. Fuzzy neural network is a combination of f...

Global Stability Analysis of Neural Networks

ZHANG Ji-ye, DAIHuan-yun, WUPing-bo

2002, 15(5): 570-574.

[Abstract](1639)

Abstract:
An analysis is made of the existence, uniqueness and globally asymptotical stability of the equilibrium point of Hopfield neural networks. Without assuming the boundedness, monotonicity and differentiability of the activation functions, the conditions ensuring existence and uniqueness of the equilib...

Application of Neural Networks in Control of Semi-Active Vehicle Suspension

WANG Yue-ming, ZHANG Wei-hua

2002, 15(5): 575-578.

[Abstract](1620)

Abstract:
In view of the nonlinear characteristics of the semi-active suspension model of vehicles, a study on the application of the adaptive control based on neural networks to semi-active suspension is made. An identifier and a controller with feedforward neural networks are designed, and a specialized lea...

Dynamic Performances of Meter-Gauge Passenger Car with Forced-Steering Bogies

LIUHong-you, ZENG Jing, LI Wen-xue

2002, 15(5): 579-583.

[Abstract](1761)

Abstract:
A dynamic model for the meter-gauge passenger car with forced-steering bogies is built, in which some effective treatment methods of the forced-steering mechanism are presented, and the effect of the mechanism parameters of the forced-steering bogies on the dynamic performances of the passenger car ...

New Optimization Model of Curve Fairness

LIU Ge, LI Bai-lin

2002, 15(5): 584-587.

[Abstract](1811)

Abstract:
Curve fairness is an important issue in CAD/CAM. This paper begins with a discussion of the existing optimization models for curve fairness, followed by design of a novel optimization model for curve fairness with the method of smoothing initial data directly. An evolutionary programming algorithm i...

Demand under the Level of Full Employment: Causes and Countermeasures

LUO Ren-hui

2002, 15(5): 588-592.

[Abstract](1219)

Abstract:
A function for multi-department production is established, and used to analyze the causes of demand under the level of full employment. It comes to a conclusion that demand under the level of full employment is partly due to the supply of economics and partly due to the demand. According to the caus...

Research on Agricultural Nonpoint Sources Pollution Based on GIS

YU Su-jun, GAO Ping-ping, HE Zheng-wei

2002, 15(5): 593-596.

[Abstract](1439)

Abstract:
A study on agricultural nonpoint source (AGNPS) pollution in Mianyang Guansihe watershed is conducted. The authors have developed a methodology to automatically produce a majority of input data required by an AGNPS model, and to display either all or selected AGNPS output data in GIS files. The spec...

The Purification of Alkaline Phosphatase fromEisenia Foetide Sarigng

LI Sui-yan, LI Qing-yi

2002, 15(5): 597-600.

[Abstract](1045)

Abstract:
Alkaline phosphatase (AKP) was purified from the cell extracts ofEisenia Foetida Sarigngusing the routine means: n-bulanol extraction, ammonium sulfate fractional precipitation, DEAE-cellulose chromatography, Sephadex G-100 and Sephadex G-200 gel filtration. The purified AKP was found to be homogene...

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2002 Vol. 15, No. 5