西南交通大学学报

An Automatic Optimization Method for Designing the Initial Horizontal Alignment of New Railway Lines

YISi-rong, ZHANGJia-ling, DENG Yu-cai

2002, 15(1): 1-4.

[Abstract](1469)

Abstract:
In order to obtain a reasonable initial horizontal alignment scheme for optimization of a new railway line quickly, the procedure of the initial horizontal alignment is divided into two stages: 1) to find a chain-linked fold line fromthe centerline ofthe route selected by aerial surveying alignment,...

Aerodynamic Effect of Large-Scale and High-Speed Landslide

LIUYong-jiang, HUHou-tian, BAI Zhi-yong

2002, 15(1): 6-9.

[Abstract](1545)

Abstract:
On the basis of aerodynamics, the aerodynamic effect of landslide body flying at a high speed in the air is studied, and the differential equation of move is elicited. According to the obtained equation, the duration time and distance of landslide flying can be figured out. The results are significa...

A Quantitative Method for the Coupling Effect of Temperature Fields and Stress Fields in Rock Mass

HE Yu-long, YANGLi-zhong, YANGMing

2002, 15(1): 10-13.

[Abstract](1464)

Abstract:
The coupling mechanism between temperature fields and stress fields is briefly analyzed, and a quantitative method for calculating the coupling parameterPTCis introduced in detail based on the thermo- elasticity effect and the thermal diffusion equation. The proposed quantitative parameter is used t...

Study on the Criterion of SMA Framework

LUYong-gui, ZHAOKe

2002, 15(1): 14-18.

[Abstract](1822)

Abstract:
Fromthe traditional pointof view, the criterion of framework forSMA(stone matrix asphalt) mix is thatVDRC(the voids in coarse aggregate on the dry rodded condition) must be larger thanVMix(the voids in coarse aggregate of mix). However, there are several facets, such as the compaction method, the me...

Mechanical Properties of Roller Compacted Concrete

DENG Rong-gui

2002, 15(1): 19-15.

[Abstract](1276)

Abstract:
To investigate the mechanical properties of the roller compacted concrete (RCC) of a high arch dam in Minjiang river catchment, the RCC samples drilled out of the damwere tested under routine triaxial pressure and direct shearing loads. According to the test data, the properties of deformation, stre...

Research on Technical Conditions of Chromium-Containing Residue as Cement Mineralizer

FUYong-sheng, OUYANGfeng

2002, 15(1): 26-28.

[Abstract](956)

Abstract:
The best technical conditions of chromium-containing residue acting as cement mineralizer are obtained in pilot production. The proper additive ratio of chromium-containing residue in producing cement in a vertical furnace is 2%; and the temperature should be controlled at 1 300℃to 1 400℃. With this...

Pozzolanic Activity and Morphology Features of Concrete Admixture of Lithium-Salt Residue

XIAChun, LIUHao-wu, YANQi-xiang

2002, 15(1): 29-34.

[Abstract](1360)

Abstract:
A newtype of concrete admixture is fabricated by mixing lithium-salt residue (LSR) and fly ash in a certain proportion. Experiments on this admixture show that: the addition amount of LSR affects the pozzolanic activity of the concrete admixture and the strengths of concrete aged 7 d, 28 d and 60 d ...

Exact Solutions of Evolution Equation for Generalized Thermodynamic Coordinates of Viscoelastic Medium

DAIGuang-ze, XIA Yan, ARAKIShigetoshi

2002, 15(1): 35-39.

[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 verymuch on the properties of their coefficient matrices. These matrices are usually affected by the natu...

Random Vortex Method for Two-Dimensional Flow past Bluff Body

LIXiao-yu, SUO Qi-feng, QIANG Shi-zhong

2002, 15(1): 40-43.

[Abstract](1266)

Abstract:
The theory of stochastic differential equation is employed in the discrete vortex method to solve the problem of two-dimensional flow past a bluff body. The Von Karman Vortex Street, the distribution of radial velocity on the wake axis, and the coefficients of lift and drag are obtained by the prese...

Hydrogenerator Rotors: Zero Frequency of Torsional Vibration and Resonance

CHENGui-qing, YANG Yi-ren, QIUJia-jun

2002, 15(1): 44-48.

[Abstract](1415)

Abstract:
The clearance energyofmagnetic field and electromagnetic stiffness of a large hydrogenerator unit are obtained, the formula for solving the whole torsional natural frequency of the hydrogenerator rotors is derived, and the zero frequency of torsional vibration under the rated running condition is ca...

Experimental Study on Explosive Technology to Prepare Hydroxyapatite Coating on Titanium

ZHOUYou-long, HUANGNan, ZHANGJi-chun

2002, 15(1): 49-52.

[Abstract](963)

Abstract:
Hydroxyapatite (HA) coating on titaniumwas prepared by. Explosive temperature, pressure and velocitywere obtained with thermodynamics and the detonation wave theory, and the experimental results were also analyzed with the detonation wave theory. Because of curvisurface wave, the coating was not uni...

Travel Cost Analysis of Air Transportation

SUNHong

2002, 15(1): 53-56.

[Abstract](1377)

Abstract:
In order to improve the competitive power of air transportation, it is necessary to strengthen the analysis of market demand, especially on the choice behavior of passengers between air transportation and highway or railway transportation. In this paper, a mathematical model of travel cost is establ...

Cost-Benefit Analysis of GNSS Non-precision Approach on Feeder-Route Aerodromes

ZHANG Fei-qiao, ZHANG Ze-long

2002, 15(1): 57-60.

[Abstract](1342)

Abstract:
Global navigation satellite system (GNSS) is the trend of development and application of CNS/ ATMtechnology in civil aviation. The cost-benefit analysis methods for the GNSS non-precision approach and the traditional non-precision instrument approach are given as reference formiddle or small feeder-...

Air Traffic Flow Management by Use of Flight Routes and Aerodrome Areas as Nodes

ZHANGXin-jun, YEHuai-zhen

2002, 15(1): 61-64.

[Abstract](1516)

Abstract:
Air traffic flowmanagement is a systematic programming management for solving air traffic jams. In this paper, by using flight routes and aerodrome areas as the nodes to control air traffic flows, an integer programming model of air traffic flowmanagement based on holding on ground is established. T...

Toll Diversion and Rational Toll Rate of Highways

CHUKe-bo

2002, 15(1): 65-67.

[Abstract](1214)

Abstract:
The toll rate directly influences the traffic volume on toll highways, and hence influences the benefits of the projects. After an analysis of the factors affecting the route choice of cars, the concept of perceived operating cost is put forward. Amethodology for rationally setting the toll standard...

Network Model and Algorithm for Freight Train Marshalling Plan

LI Ying-hong, WUShi-gui, PENG Qi-yuan

2002, 15(1): 68-71.

[Abstract](1796)

Abstract:
This paper begins with a description of the complexity of making up freight train marshalling plans. It is pointed out that an exact and rational result can be obtained by joint optimization of car flow routing and marshalling plan. Then, a mathematical model is built by transforming the problem of ...

A Simulation System for Rolling Freight Cars at the Rear of Marshalling Yard

MIJie, HAOJing-ru, YAO Wen-xi

2002, 15(1): 72-76.

[Abstract](1614)

Abstract:
In order to exactly describe the motion regularity of rolling freight cars at the rear of marshalling yard, and provides a basis for scientifically and rationally planning the installation of anti-rolling devices. The various longitudinal forces existing in the rolling course of train set are analyz...

An Analytic Method for the Synthesis of Spatial 5S-S Parallel Robot Mechanism

LILi, LIUZhao-hui, CHEN Yong

2002, 15(1): 77-80.

[Abstract](1285)

Abstract:
Groebner base is an important concept and a powerful tool for solving the problems in nonlinear polynomial algebraic systems. In this paper, an algebraic method based on Groebner bases is applied to the synthesis of a spatial 5S-S parallel robot mechanism for the first time. The symbolic triangular ...

The Design and Simulation of Electric Vehicle Drive System with High Frequency AC Pulse Density Modulation

MAXian-min, CHENQuan-shi

2002, 15(1): 81-84.

[Abstract](1418)

Abstract:
A novel drive system with high frequency AC pulse density modulation for electric vehicles is proposed, and its operation principle and control method are studied in detail. Theoretical analysis shows that the suggested system is characterized by high energy density, small volume and high efficiency...

Evaluation of Performance of Cold Air Distribution Diffuser

CAIDe-yuan, GUAN Yan-zheng, ZENG Yan-lin

2002, 15(1): 85-89.

[Abstract](1215)

Abstract:
The performance of a windmill-centrifugal fan induction-diffuser is analyzed through experiments and numerical simulation. It is shown that this type of diffuser has a high induction ratio, and can operate well in a large variation range of airvolume. Therefore, it can provide a fairly uniformdistri...

The Properties and Application of a Mixed Operation in Evaluation Lattice

WUHong-bo, WENQiu-mei

2002, 15(1): 90-4.

[Abstract](1177)

Abstract:
TheR0-algebra, implication lattice and basic logic algebra are studied. The properties of a mixed operation ∶a b= (a→ b) in evaluation lattice, especially its properties inR0-algebra, are discussed. Akind of filter is derived by use of this mixed operation, with some interesting results being obtain...

A Method to Calculate the Minimum Path Sets between Two Nodes in a Network

CHENG Shi-juan, HEPing

2002, 15(1): 95-98.

[Abstract](1203)

Abstract:
Based on connectionmatrix, this paper presents a newmethod to calculate the minimumpath sets between two nodes in a network, and gives a precise proof of it. By this method, the rows corresponding to the input nodes and the columns corresponding to the output nodes in the general connection matrix o...

A New Algorithm for Fuzzy Multi-objective Prediction Control Based on Satisfactory Optimization

FENGXiao-yun, ZHAO Dong-mei, LI Zhi

2002, 15(1): 99-102.

[Abstract](1556)

Abstract:
A new method of optimization control is proposed, in which the traditional optimum control is substituted by satisfactory optimization control in performance optimization of fuzzymulti-objective prediction control. By studying the single step prediction model of fuzzy multiple objectives, an algorit...

Reliability and Security Analysis of 3-Module Redundancy System with One Maintainable Unit

WANGLi-hua, XUZhi-gen, WANG Chang-lin

2002, 15(1): 103-107.

[Abstract](1596)

Abstract:
The reliability and security of 3-module redundancy systems are derived in detail on the basis of Markov model, in which the influences of faulty coverage ratio and maintenance rate are considered. The differential equation group for solving the reliability and security of the system is presented, a...

Application of Microcomputer to Economical Four-Stage Semi-control Rectification System

MENG Yu-fa, GONG Bang-ming

2002, 15(1): 108-120.

[Abstract](1508)

Abstract:
The status in quo of the economical four-stage semi-control commutation control system for electric locomotives in China is analyzed. Aiming atthe existing problems, a digital control systembased on 8751 singlechip microcomputer is designed. It is a high performance digital controller, which possess...

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2002 Vol. 15, No. 1