西南交通大学学报

Numerical Computation of Pressure Transients During the Crossing of Two Trains in a Tunnel

ZhaoHaiheng, HuangMeirong, Wang Yunshi

1999, 12(2): 127-132.

[Abstract](1904)

Abstract:
A widely applicable calculation method for the prediction of pressure transients during the train crossing in a railway tunnel is proposed based on one dimensional unsteady compressible homentropic flowtheory. Equations of boundary conditions are built formodeling the flowduring the crossing period,...

Traffic Impact Analysis for Large-Scale Public Buildings

Huo Yami

1999, 12(2): 128-132.

[Abstract](1382)

Abstract:
The traffic problem of large-scale public buildings in urban planning is studied. The working process of TIA (traffic impact analysis) of the large-scale public building is given. The scope of traffic impact is determined, and the constitution and forecastingmodel of traffic generation are discussed...

Numerical Simulation of Longitudinal Ventilation of Long Highway Tunnel

Zhu Bing, Guan Baoshu, ZhengDaofang

1999, 12(2): 133-137.

[Abstract](2310)

Abstract:
With the use of finite element method, the numerical simulation of a tunnel jet ventilation is studied by the two-dimensional incompressible steady Navier-Stokes equation. hence the aerodynamic characteristics of jet ventilation and jet ventilating system with vertical wells are obtained. For differ...

Numerical Simulation of the Stochastic Process of Railway Track Irregularities

Chen Guo, Zhai Wanming

1999, 12(2): 138-142.

[Abstract](2007)

Abstract:
Several widely-used methods for simulating track irregularities at present are analyzed, and a new algorithm for describing the stochastic process of the railway track irregularities is constructed based on the power spectrum density equivalency in a frequency domain. The magnitude and randomphase o...

A Study on Variation of the Vertical Rigidity of Turnout along the Longitudinal Direction of Track

WangPing, LiuXueyi, Kou Zhonghou

1999, 12(2): 143-147.

[Abstract](1580)

Abstract:
Mechanical models and calculationmethods for calculatingthe rail support elasticity coefficients of fixed-frog simple turnouts and movable point rail simple turnouts are proposed. Apractical computer program is designed. With the Chinese No.12 fixed-frog and movable point rail speeding-up turnouts o...

Design of a Prestressed Tendon CAD System with Parametric Design Technology

ZhaoHuijuan

1999, 12(2): 148-152.

[Abstract](1410)

Abstract:
In this paper, the basic concept of parametric design technology is described, and the design method of prestressed tendons is analyzed. Then based on the above work, parameterization models for the design of prestressed tendons in longitudinal and sectional directions are established, and the ways ...

Coupling Vibration Analysis for Long Span Steel Cable- Stayed Bridge Crossing over Yangtze River at Nanjing on Beijing-Shanghai High-Speed Railway

LiXiaozhen, QiangShizhong

1999, 12(2): 153-157.

[Abstract](1798)

Abstract:
With the methods of bridge structural dynamics and vehicle dynamics, regarding high-speed trains and the long span cable-stayed bridge crossing over Yangtze river at Nanjing in Beijing-Shanghai high-speed railway as a combined vibration system, the 3-dimensional coupling vibration responses of the t...

Damage Detection of Steel Truss Bridge from Changes in Modes of Vibration

Gao Fangqing, Wang Fengqin

1999, 12(2): 158-162.

[Abstract](1561)

Abstract:
The damage in a steel truss model bridge is simulated by changing its element stiffness. The dynamic behaviors of the model bridge are analyzedwithFEMdynamic structural analysis program before and after the model bridge is damaged. It is found that the changes in the mode of vibration are sensitive ...

The Analysis of the Stability of Badu Station Landslide in Nanning-Kunming Railway

ChangJuyou

1999, 12(2): 163-167.

[Abstract](1749)

Abstract:
The landslide of Badu station is introduced briefly. Some measures, such as reducing load, setting up a drainage system and building various kinds of anti-landslide engineerings, etc., are taken to control the landslide. The stability of the administered landslide is analyzed through the running tes...

A Study on the Vehicle-Guideway Coupling Vibration and Suspension Parameters of Maglev Train

Zeng Youwen, WangShaohua, ZhanKunlun

1999, 12(2): 168-173.

[Abstract](1754)

Abstract:
Based on a vehicle-guideway coupling vibration model of maglev train, the equations of motion are obtained. A simulation program is designed to simulate the vehcile- guideway coupling vibration. The effects of suspension parameters, especially the restraint parameters of module roll, on the dynamic ...

A Study on the Data Structure of Feature-Based Modeling

Xu Ling, ChaiJian, WangJinnuo

1999, 12(2): 174-179.

[Abstract](1243)

Abstract:
In this paper, an interactive technique for the definition of features in geometry feature-based modeling is proposed, and the basic geometric feature is defined with the corresponding data structure. Thus the modeling can be obtained through the addition of one feature to another, and a new graph c...

Development of the Visual System of Locomotive Simulator with Video Compression

ChenHuabin, Zhou Meiyu, He Taijun

1999, 12(2): 180-184.

[Abstract](1605)

Abstract:
The history of the visual system of locomotive simulator is reviewed, with the advantages of the traditional methods analyzed. Based on the distinguishing feature of this system, and through a thorough study on the encoding theory and image sequence, a new thought and concept to design the visual sy...

An Encoding Solution and Algorithms for Job-Shop Scheduling Problem with Bottleneck

Huang　Qian, Huang　Hongzhong, Cai　Jianguo

1999, 12(2): 185-189.

[Abstract](1638)

Abstract:
Genetic algorithm is currently one of the most effective methods for solving job-shop scheduling problem. Genetic encoding technique has a deep influence on genetic operation, especially on crossover operation. This paper presents an encoding solution for job-shop scheduling problem with bottlenecks...

A Study on the Low-Cycle Fatigue Characteristics and Micro-mechanisms of a High-Strength Steel

Zeng Qingxiang, He Guoqiu, Chen Chengshu

1999, 12(2): 190-195.

[Abstract](1453)

Abstract:
The macro-characteristics of cyclic deformation of the high-strength steel 60Si2CrVAunder the condition of low cycle fatigue (LCF) are studied. Based on the TEM observations on the dislocation arrangement of the experimental material during the fatigue process, the micro-behaviors of the dislocation...

Design of an Intelligent Power Supply for Ultrasonic Generator

Hu Pengfei, Guo Shiming

1999, 12(2): 196-200.

[Abstract](1613)

Abstract:
A type of intelligent high frequency power supply used for power ultrasonic system is designed by use of the timing and counting functions of the INTEL8254, and by use of the computing and controllingfunctions ofthe single-chip computer INTEL8031. This powersupply can automatically trace the resonan...

Analysis of Globe Convergence of Explicit GPC Algorithm Based on State-Space Method

Wang Qian

1999, 12(2): 201-206.

[Abstract](1328)

Abstract:
The global stability and convergence of the explicit GPC (generalized predictive control) based on CARMA model are proved by employing the state-equation, in which the extended least-square method is taken as the identification method. It is shown in theory that the GPC algorithm based on CARMA is b...

nfluence of Radial Electric Fields on Plasma Confinement

WangShiqing, Ren Lang, Gao Qingdi

1999, 12(2): 207-212.

[Abstract](1338)

Abstract:
Radical electric fields may play an important role in L-Htransition. The influence of sheared flows induced by radical electric fields on the confinement of plasma inTokamak is discussed in this paper. A neoclassical ion heat transport coefficient model is adopted, in which the effect of sheared pol...

Distinguishing of the Radiating Benefitof Investment Projects

YangJimei, Shi Benshan, Chen She

1999, 12(2): 213-217.

[Abstract](1549)

Abstract:
Investment is an important means by which national economic and social development are promoted. The cost and benefit-distinguishing quality of an investment have direct influences on the appraisal result of an investment project. From the viewpoint of guaranteeing the benefit of thewhole country, b...

A Fuzzy Assessment Model for the Cost in the Calculation of Loss Caused by Productivity Descending

Zhao Lianwen, Guo Yaohuang, Wang Yaping

1999, 12(2): 218-222.

[Abstract](1634)

Abstract:
The problem of claim for the loss caused by productivity descending in engineering project claims is discussed. By use of the time sequence exponential smoothing principle and method and fuzzymathematical theory, a fuzzy assessmentmethod for cost in the calculation of loss caused by productivity des...

Application of AHP to the General Planning of Yard and Station of Highway Main Hub

Yan Qipeng, Wang Zhongqiang

1999, 12(2): 223-227.

[Abstract](1421)

Abstract:
The planning of highway network of our country contains the constructions of the main framework of highway, the main channel of water transport, the main hub of harbor- station, and the supporting systemofmodern traffic. In order for the planning and construction of the highway network of our countr...

The Multiobjective0-1Programming of Transportati on Investment with Fuzzy Coefficient

Zhang Yongjun, Zhou Shuanggui, Du Wen

1999, 12(2): 233-237.

[Abstract](1543)

Abstract:
The transportation system is a complicated economic system, and a transportation investment is a multiobjective decision-making problem. In this paper, based on the transportation investment decision-making problem, a multiobjective 0-1 programming FTIMOLP mathematical model for a transportation inv...

Design and Production of Multi-Structure Silver Halide Crystallite

QiLinli, Li Zhiming

1999, 12(2): 238-242.

[Abstract](2858)

Abstract:
With the decrease in the size of cubic silver halide crystallites, the resolution of silver halide photographic emulsion increases, meanwhile, its sensitivity decreases rapidly. The structure of silver halide microcystal grains has great influence on the sensitivity. In this paper, the design princi...

Study on the Purification of Reclaimed Acid with Sedimentation-Absorption Method

Liu Jing, Tong Zhiping, Sheng Caoying

1999, 12(2): 243-248.

[Abstract](929)

Abstract:
Based on the detailed analyses of the characteristics and composition of refined benzene reclaimed acid produced in Pangang coke plant, and based on the comparative study of present purification methods, a new purification method, sedimentation and absorption method, is proposed. The newmethod is ea...

Mean Convergence Criteria for Quasi Hermite-Fejer Interpolating Operator

Wen Chenglin, ZhouXianwei

1999, 12(2): 249-252.

[Abstract](1209)

Abstract:
The mean convergence of quasi Hermite-Fejer interpolation operatorQ2n+1(w, f, x)is studied with the zeros of a kind of Jacobi orthogonal polynomial as interpolation node. Three convergence criteria for discriminating the operatorQ2n+1(w, f, x)converging to f(x)in mean are presented. Their equivalenc...

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1999 Vol. 12, No. 2