西南交通大学学报

Lateral Stability Analysis for Rail Vehicle Dynamic Models with Uncertain Parameters

Cao Dengqing

1999, 12(3): 253-258.

[Abstract](1466)

Abstract:
Consider the rail vehicle dynamic models with uncertain parameters and nonlinear uncertainties. Using the Lyapunov stability theory and employing the special properties of matrices, a lateral stability criterion for the system is derived. The robust stability bounds obtained are not necessarily symm...

Simulation of Pressure on Overline Bridge Due to High-Speed Train Passage

Lei Bo　, Liu Yingqing

1999, 12(3): 259-263.

[Abstract](1736)

Abstract:
It is necessary to predict the aerodynamic load on buildings near the track due to high-speed train passage for designing these buildings and determining their limit. In this paper, a numerical computation of pressure on overline bridge surface by a high- speed train head is carried out with 3D Pane...

Dynamical Analysis and Improving Measures for the Bogies of Heavy Switching Locomotive

Chen Qing, Pu Dezhang

1999, 12(3): 264-268.

[Abstract](1556)

Abstract:
Normal bogies of trunk locomotives are not fitted to the switching services on the curve line with small radii. With the increasing of the axle load, this case is getting worse. The technical characteristics and the test results on the bogies of the diesel locomotives used on mountainous areas and h...

Algebraic Method of Hopf Bifurcation of Railway Vehicle System

Wu Pingbo, ZhangJiye

1999, 12(3): 269-273.

[Abstract](1985)

Abstract:
The theories of stability and bifurcation are used to analyze the hunting bifurcation of nonlinear railway vehicle system in this paper. An algebraic criterion of the point causing Hopf bifurcation and its analysis method are given with Hurwitz determinant. By using this method, the research on the ...

Stick-Slip Vibration Analysis of Constrained Wheelset

Zhang Limin

1999, 12(3): 274-278.

[Abstract](1762)

Abstract:
Analysis of stick-slip vibration of two contact bodies is executed in detail based on the dynamics of stick-slip systems and principle of non-linear friction. A stick- slip vibration equation is established for SDOF system, and conditions which stick-slip vibrations begin to occur are deduced, the e...

Study of Controlling of an Electromagnet and Permanent Magnet Suspension Isolation System

Liu Shangju, Yan Ju, Chen Qiu

1999, 12(3): 279-283.

[Abstract](1634)

Abstract:
Precise instruments and devices used on aircrafts should follow low frequency motion as aircraft taking off and on normal fying; on the other hand, they should also isolate the high frequency motion caused by spurting fuel, etc. This paper studied a novel isolating method-electromagnet and permanent...

A Recursive Formulation for the Dynamic Analysis of Open Loop Tree Deferrable Multibody Systems

TangHuaping, KongXiang an

1999, 12(3): 284-289.

[Abstract](1411)

Abstract:
In this paper, a relative coordinate system is introduced to describe the motion of flexible multibody system. This coordinate system fully utilizes the property of transform matrix to reduce the nonlinear couplings between rigid and elastic motion. A recursive formulation for the dynamic analysis o...

A Palletising Robot Based on the DELTA Robotic Mechanism

Hua Weishi

1999, 12(3): 290-294.

[Abstract](1295)

Abstract:
A design of palletizing robot based on the DELTA robotic mechanism is presented in the paper. The robot has high rigidity, high accuracy, and low mobile mass relative to an equivalent serial robot. It is suitable to be used for rapid palletizing and transfer operating. The design could have some oth...

Agitation Mechanism and Its Application Research of a New-Type Punched Agitator

Liu Jing, Xiang Qun, WangNengqin

1999, 12(3): 295-299.

[Abstract](1173)

Abstract:
Based on the mixing principle, the authors analyze the agitation mechanism of a new-type punched agitator,and announce that such punched agitators with simple structure not only can improve the mixing through intensifying the eddy spread,but also reduce the power consumption by diminishing the proje...

Detecting Methods of Transient Faults and Permanent Faults for Multiple Line Traction Network

Gao Shibin, Chen Xiaochuan, Xu Zhigen

1999, 12(3): 300-304.

[Abstract](1334)

Abstract:
Two methods, voltage detecting method and compensated voltage detecting method, are proposed for detecting the permanent faults and transient faults of multiple line traction network. The effectiveness and sensitivity of these two methods are verified by computer simulation. The simulation results s...

Application of New Binary Model Structure in Power Electronic Circuits Simulation

Yan Jifu, Li Zhi, Xiao Tijing

1999, 12(3): 305-309.

[Abstract](1400)

Abstract:
This paper presents a new simulation method for power electronic circuits through the uses of a digital computer. Semiconductor switches are described as binary inductor models, with very low values of inductance during conduction and infinite values of inductance in other case. Also, in the paper, ...

Research of Data Transformation and Fusion in Virtual Environment

Ding Guofu, WangJinnuo

1999, 12(3): 310-314.

[Abstract](1265)

Abstract:
Virtual Environment (VE) is a simulation environment,which fuses much information of cyber-soace to make the effect of immersion and interaction. To interact the virtual objects in VE , a series of geometric transformation should be offered .This paper studies the geometric transformation procedure,...

A Mimetic Statics Numeric Method on Earthquake Resistance Analysis of Shallow Buried Tunnels

Lu Helin

1999, 12(3): 315-319.

[Abstract](1531)

Abstract:
A mimetic statics numeric method on earthquake resistance analysis of shallow buried tunnels is introduced in this paper. The effects of seismic waves are regarded as equivalent static loading on surrounding rock and tunnel lining. According to the feature of the seismic waves, the effects of body w...

The Seismic Response Behavior of Long Span CFST Arch Bridge

Zheng Shixiong, Zhou Shuhua, Ding Guibao

1999, 12(3): 320-324.

[Abstract](1714)

Abstract:
A seismic response model of long span concrete filled steel tube (CFST) arch bridge is set up. Taking a bridge of 76+360+76 m span concrete filled steel tube tied arch bridge as an example, the seismic response behavior is systematically studied. The results show that in the apex of arch the respons...

Heat Transportation in Tunnels When Train with High Temperature Passing Through

Wu Xiyong, Wang Ying, Zheng Anqi

1999, 12(3): 325-330.

[Abstract](1505)

Abstract:
Due to heat transportation, the temperature field in tunnels will change when the trains with high temperature passing through. The moving heat transportation owing to high temperature source is studied, and the temperature distribution in a tunnel is calculated in an example. The results can be use...

High Density Resistivity Imaging Technique and Its Application in Prospecting Diseases of Railway Bed

Jiang Weihong, Jiang Zhenghong, Wang Bin

1999, 12(3): 331-336.

[Abstract](1627)

Abstract:
This paper introduces the elementary principle of the high density resistivity imaging method which springs up in the field of hydrology, engineering and environmental geophysical prospecting in recent year. According to the characteristics of the diseases of the railway bed, the study and applicati...

Brazil Test of Rocks with Bearing Plates of Press

FengXingqiao, Cao Fuen

1999, 12(3): 337-342.

[Abstract](1275)

Abstract:
This paper presents a study on Brazil test of rocks using the bearing plates of a press. The rocks used in the study are of red-sandstone(kig) of the Jiaguan section of the cretaceous period taken from Emei, Sichuan Province. Brazil tests are conducted according to rock mechanics, and tensile and pr...

The Effect of Nitrogen on the Characteristic of Low-Cycle Fatigue of 316 Series Austenitic Stainless Steels

He Guoqiu, Chen Chengshu, Gao Qing

1999, 12(3): 343-348.

[Abstract](1408)

Abstract:
Tests on low-cycle fatigue under uniaxial tension-compression and multiaxial nonproportional loading of two typical strain paths and the observation on micro structures of 316L and 316LN austenitic stainless steels are made. The effect of nitrogen element on the characteristics of low-cycle fatigue ...

Thermodynamic Properties of the Bulk Metallic Glass

ZengXiaolan

1999, 12(3): 349-353.

[Abstract](1321)

Abstract:
By Differential Scanning Calorimetry (DSC), the transition temperatureTg and the primly crystallization temperatureTxof the metallic alloy Zr-106 are measured. Their values are 325℃and 470℃respectively. After the material is heated at the different temperature and different time lengths in the tempe...

A New Method of Fuzzy Comprehensive Evaluation and Its Application in Evaluating Laboratory

Pu Dezhang

1999, 12(3): 354-359.

[Abstract](1453)

Abstract:
In order to proceed comprehensive evaluation of complicated multi-factors system with fuzzness rationally, a new mathematical model is established about multi- factors and multistage fuzzy comprehensive evaluation by combining fuzzy matrix with fuzzy integral. Then a method is put forward for determ...

Structure and Consistent of the Non-Parametric Kernel Density Estimation

Liu Haiyan, Zhao Lianwen

1999, 12(3): 360-364.

[Abstract](1349)

Abstract:
A kind of kernel density estimation method is discussed in non-parametric statistics for independently and identically distributed random variable of density. In this discussion, a new estimation value method is introduced; then, the method’s consistency, the stability, the optimal bandwidth, and as...

Study on Optimization of Through Goods Train’s Linkage at Technical Station

Zhu Jianmei

1999, 12(3): 365-368.

[Abstract](1541)

Abstract:
By analyzing the relationship between the through goods train’s linkage and the equilibriumof departure trains at technical stations, a network flow model for linking through goods train is set up.This problem can be solved by using the special algorithm for minimal cost maximum flow. Its applicatio...

Discussions on Network Planning of Urban Rail Transit

Wang Zhongqiang, Gao Shilian, JiangJinqi

1999, 12(3): 369-373.

[Abstract](1451)

Abstract:
To make URT network plan quantitatively rather than qualitatively, some key points about URT network planning are probed in this paper. Rational scale of network is investigated with modal analysis by means of system analysis and graphic theory. A planning methodology of initial network and its soft...

Study on the Installation of Passenger Stations in Communications and Transportation Hub

Xi Qing, Huo Yamin, YeHuaizhen

1999, 12(3): 374-378.

[Abstract](1566)

Abstract:
Studying on the traffic transfer mode and on the basis of coordinating the transportation forms in hubs, a method of installation of passenger stations using the transportation corridor principle, of which concentration and dispersion is combined, is put forward.

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1999 Vol. 12, No. 3