西南交通大学学报

Mechanism of Longitudinal Force Transmission of Welded Turnouts with Different Structures

WANG Ping

2003, 16(4): 371-374.

[Abstract](1376)

Abstract:
The regularity of longitudinal force transmission of welded turnouts with different types of frog and heel is investigated, and the effects of frogs and heels on the force and displacement of the parts of a welded turnout are discussed. The types of frog and heel dicussed include rigid frog, long-wi...

Stability Analysis of Jointless Turnout Based on General Formula

TIAN Chun-xiang, WANG Ping

2003, 16(4): 375-379.

[Abstract](1720)

Abstract:
Based on the general formula for the stability analysis of common jointless tracks, the calculation method for the stability of switches of a jointless turnout is put forward. By taking the No.18 turnout in the Qinhuangdao-Shenyang passenger express line as an example, the relationship between the s...

Process Eigenvalue and Quality of Continuous Flash Welding of Alloy Rail

HUANG Jian-ping, DAIHong, LUO De-yang

2003, 16(4): 380-383.

[Abstract](1372)

Abstract:
Aiming at the problem that the use ofК190Лкwelding machines for welding PD3 60 kg/m rail makes the quality of joints not satisfy the TB/T1632 - 91 standard because of the existence of grey spots in welding joints, the relationship between the quality of rail joints and the eigenvalue of high frequen...

Continuous Calculation of Steady-State Solutions for Railway Vehicle Curve Negotiation

LvKe-wei, ZENG Jing

2003, 16(4): 384-388.

[Abstract](1680)

Abstract:
In order to better understand the mechanical behavior of railway vehicles from a straight track into a curved track, the steady-state solutions(equilibrium points) of a vehicle system are investigated. By using the DERPAR algorithm, the numerical calculation of steady-state solutions of a vehicle sy...

2-D Finite Element Analysis of Prestressed Anchorage Sheet-Pile Wall

FUHai-ying, HE Chang-rong, CHEN Qun

2003, 16(4): 389-392.

[Abstract](1631)

Abstract:
With 2-D finite element method (FEM), the moment and displacement of metope piles, the stress and displacement of interface between anchorage pile and surrounding rock, the settlement and earth pressure of filling soil, and the internal force of anchored cables are calculated in six typical conditio...

Relationship between Moment and Axial Load of Reinforced Concrete Columns Strengthened with Prestressed Struts

JIANG Hua

2003, 16(4): 393-397.

[Abstract](1575)

Abstract:
Based on the basic formula of the limit load-bearing capacity of reinforced concrete (RC) columns strengthened with prestressed struts, the relationship between momentMand axial loadN of a strengthened column is analyzed theoretically, and itsM-Ndiagram is obtained. By comparing with theM-Ndiagram o...

Discussion on Some Issues in Theory of Soil Arch

JIAHai-li, WANG Cheng-hua, LIJiang-hong

2003, 16(4): 398-402.

[Abstract](1326)

Abstract:
Some issues in the theory of soil arch in the geotechnical engineering are brought forward, including the forms of spandrel, the shape, geometric parameters and microscopic properties of soil archesetc. From the forming mechanism of soil arches, they are divided into four types,i. e.directly-forming...

Effect of Crowd on Propagation Characteristic of Electromagnetic Waves in Limited Underground Space

SUNJi-ping, ZHANG Chang-sen

2003, 16(4): 403-407.

[Abstract](1546)

Abstract:
By using the finite element method, the effect of crowd on the propagation characteristic of electromagnetic waves in a limited space such as an underground marketplace and an underground platform is investigated. The calculation result shows that crowd s reflectance coefficient increases but the tr...

Development of Automobile ABS Controller Based on Threshold Control Method

SUN Ren-yun, GUO Xin, LONG Xing-xian

2003, 16(4): 408-413.

[Abstract](1658)

Abstract:
Through the investigation of automobile anti-lock brake systems(ABS), the controller suitable for hydraulic brake systems is developed with the threshold control method. A proto-type controller has been manufactured and tested on the test-bed. The test result shows that the ABS controller with 80C19...

Real Time Simulation System for AC Drive Controller Test

SONG Chang-lin, HUPeng-fei, LI Zhi

2003, 16(4): 414-417.

[Abstract](1659)

Abstract:
An AC drive simulation system, composed of two PCs and two high speed communication cards on the basis of PCI, is presented. Its software is designed to calculate the running parameters of the AC drive system, including transformer, quadrant rectifier, DC circuit, inverter, AC motor and train load. ...

Research on Micro-Computerized Automatic Block System between Railway Stations

ZOU Shao-wen, GUO Jin, YANG Yang

2003, 16(4): 418-422.

[Abstract](1744)

Abstract:
Through analyzing the feasibility of a micro-computerized automatic block system between railway stations based on CAN bus, the plan of its realization is proposed,including the structure, function, working principle and design of the system. In addition, the safety control logic of the system is an...

New Blind Equalizer Based on Filtering in DCT Domain

DENG Xiao-hong, ZHANG Jia-shu

2003, 16(4): 423-427.

[Abstract](1453)

Abstract:
Based on the constant modular algorithm (CMA), a new type of blind equalizer with filtering in discrete cosine transformation (DCT) domain is proposed for the amplitude-and phase- modulated digital communication systems. Computer simulations show that the performance of the proposed blind equalizer ...

Study on Parallel Algorithm in H.26L Video Encoder

ZHAO Yu-lin, PENG Qiang, WUXiao-xiong

2003, 16(4): 428-432.

[Abstract](1352)

Abstract:
Through the analyses of the parallelism of H.26L video encoder and its performance, several parallel computation schemes are discussed, and a scalable scheme is implemented by using MPI. The experimental results on Dawning-2000 MPP processors show that the H.26L video encoder has a good parallel per...

Algorithm of Transforming Any Formula in LF(X)into Reducible Form

MENG Dan, SONG Zhen-ming, QIN Ke-yun

2003, 16(4): 433-437.

[Abstract](1225)

Abstract:
In the process of automated reasoning based on the resolution principle by computers, it is necessary to transform any formula into reducible form. The algorithm of transforming any formula in LF(X)is investigated. Based on the introduction of LF(X)and the related concepts, theoretic results for the...

Matrix Characterization of a Type of Disjoin Preserving Operators on Classical Banach Lattices

FENG Ying, CHEN Zi-li, FENG Tian-xiang

2003, 16(4): 438-440.

[Abstract](1363)

Abstract:
The characterization of disjoint preserving operators fromRntoRmis presented by means of the matrix with the property that there is at most one nonzero element in every row. And this result is generalized to the characterizations of bounded disjoint preserving operators from classical Banach lattice...

Eigenvector Method of Weight Vector of Generalized Judgment Matrix in Analytic Hierarchy Process

SUNJiang-ming, SUN Li-mei

2003, 16(4): 441-444.

[Abstract](1460)

Abstract:
Through a deep study on the consistency of generalized judgment matrixes, new restraint equations of the weight vector of setS=u1,u2,...,unare obtained. The weight vector can be solved using the equations when the structure matrix corresponding to the set s generalized judgment matrix is irreversibl...

Column Action Method with Orthogonalization for System of Linear Algebraic Equations

YANG Ben-li, ZENG Xian-wen, LI An-zhi

2003, 16(4): 445-449.

[Abstract](1288)

Abstract:
A new SISD iterative algorithm is put forward to effectively solve arbitrary consistent or inconsistent system of linear algebraic equations. It is proved that accurate theoretic or least square solutions of the system can be obtained throughmiterations. In addition, the computational complexity, th...

General Algorithm of Two Kinds of Cubic Spline Interpolation Functions

FENG Tian-xiang

2003, 16(4): 450-453.

[Abstract](1335)

Abstract:
The aim is to solve two kinds of cubic spline interpolation functions in a general algorithm and show the detailed derivation. By combining the spline equations based on the initial conditions for two kinds of splines, the calculation formula for cubic spline interpolation functions is derived in de...

Property of Difference Coefficientσ/μ for Optimal Portfolio and Its Determination

ZHAO Xin-shun, SHI Ben-shan

2003, 16(4): 454-458.

[Abstract](1445)

Abstract:
On the basis of Markowitz s mean-variance model subject to the condition of short sale, the existence and uniqueness of the difference coefficient and its optimal solution are discussed. And under the more practical condition of no short sale, the above properties are proven. The mathematical expres...

Graphic Analysis of Efficient Frontier of Portfolio

YAO Yuan

2003, 16(4): 459-462.

[Abstract](1577)

Abstract:
Based on the theory ofE-V(expected value-variance) and the mathematical model of the efficient frontier of portfolios, the expected profit and variance of a portfolio including three securities under the different allocation proportions of capital are discussed, and the graphic expressions of lines ...

Study on Second-Degree Price Discrimination under Conditions of Oligarchic Competition

GUO Chun-xiang, GUO Yao-huang

2003, 16(4): 463-467.

[Abstract](1302)

Abstract:
The conditions of profit maximizing under the second-degree price discrimination are investigated using the game theory and a quantitative method. Based on the above discussion, the coditions of profit maximizing are generalized. In addition, profit maximizing under the conditions of linear and non-...

Analysis of West Coast Port Lockout in USA Based on Dynamic Game Theory

YE Yong, TAN De-qing, LIU Bo

2003, 16(4): 468-471.

[Abstract](1297)

Abstract:
Based on the dynamic game theory and the Leontief model, the event of west coast port lockout in USA is analyzed by applying the Nash equilibrium model, and its possible results are discussed. The research shows that after the struggle between the Stock Workers Union (SWU) and the Pacific Maritime A...

Research on Benefit Distribution in Signal Control Model

ZHANG Zhi-jue

2003, 16(4): 472-476.

[Abstract](2053)

Abstract:
A multiobjective programming model combining signal control and equilibrium network designs under equity constraint is proposed. With the utility function method, the two-objective upper level optimization is transfered into a single objective optimization problem. In this case, the proposed model b...

Forecast of Traffic in Sichuan Province in the Tenth Five-Year Plan

XUE Bo, GUO Qiang, HU Ying-jie

2003, 16(4): 477-481.

[Abstract](1486)

Abstract:
Based on the analysis of factors influencing the traffic and transportation in Sichuan Province, a conclusion is drawn that the level of economic development and its population are the two most important factors. Economic models are built up to forecast the traffic in Sichuan Province in the 10th Fi...

Model for Attractive Area of Urban Rail Transit Stations and Its Algorithm

LIUHui-min, LIU Wei-hua

2003, 16(4): 482-485.

[Abstract](1540)

Abstract:
The present researches on the attractive area of urban rail transit (URT) stations are analyzed, and their shortcomings are pointed out. On the basis of some rational hypotheses, the method to determine the attractive area in single lines is discussed, a model for the attractive area is set up, and ...

Analysis of Drivers Security Reliability Based on Error Possibility

XUJie, DU Wen, MA Guo-zhong

2003, 16(4): 486-590.

[Abstract](1497)

Abstract:
Error possibility, a fuzzy method evaluating man-made errors, is adopted to analyze the reliability of drivers driving instead of error rate used in the present analyses. And man-made errors are analyzed and evaluated based on fault tree. A conclusion is drawn that the error potentiality of a top ev...

Determination of Nitrite in Water with Flow Injection Chemiluminescence Method

GONG Zheng-jun, ZHANG Zhu-jun

2003, 16(4): 491-493.

[Abstract](1342)

Abstract:
A new chemiluminescence method for the determination of nitrite in water is presented. This method is based on nitrite reaction with hydrogen dioxide solution with catalyst acid to create peroxynitrous acid. Peroxynitrous acid reacts with alkaline solution of luminol, producing chemiluminescence. Th...

Synthesis of Tetra-Imidazolylmethyl Bi-Phenol Compounds

LU Shu-he, LIUZhi-chang, LIUXiao-xia

2003, 16(4): 494-496.

[Abstract](1087)

Abstract:
Tetra-imidazolylmethyl bi-phenol compounds (3a,3b) are efficiently synthesized and structurally confirmed. 4, 4 -dihydroxydiphenylpropane and 4,4 -biphenol are respectively treated with paraformladehyde to give tetra-hydroxyl derivative (2a,2b). Treatment of (2a,2b) with imidazole at 130 to 140℃and ...

Experimental Investigation on Vibration Performance of Polyurethane Foam Plastic

TANG Yi-ke, GONG Xian-sheng, GU Qian-kun

2003, 16(4): 497-500.

[Abstract](1422)

Abstract:
An experimental device of the vibration performance of foam plastic was set up. The vibration test of a reinforced plastic material was carried out. Experimental results show that the vibration performance of this foam plastic material has relation not only to vibration amplitude but to exciting fre...

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2003 Vol. 16, No. 4