西南交通大学学报

Geometrical Nonlinear Analysis of Thin-Walled Box Girder with Variable Height

LUO Qizhi, CHEN Yuji

2007, 20(5): 521-525.

[Abstract](1450)

Abstract:
Based on the variation principle of potential energy and considering the shear lag effect of stresses on flanges and the geometrical nonlinearity of vertical deflection of structures,the nonlinear governing differential equation was derived and solved by using the spline least square collocation met...

Model Test of Cantilever Casting Construction of Reinforced Concrete Arch Bridge

LI Xiaobin, YANG Yongqing, PU Qianhui, LIU Zusheng

2007, 20(5): 526-530.

[Abstract](1912)

Abstract:
In order to demonstrate the feasibility of the construction technique of cantilever casting of a reinforced concrete arch bridge and the rationality of cable force adjustment and construction control,a model test of cantilever casting construction was made by taking the No.1 Baishagou bridge as proj...

Vibration Analysis of Noise Barrier Structures Subjected to Train-Induced Impulsive Wind Pressure

JIAO Changzhou, GAO Bo, WANG Guangdi

2007, 20(5): 531-536.

[Abstract](1615)

Abstract:
A numerical analysis of the dynamic response,induced by the impulsive wind pressure of trains,of noise barrier structures with stop plank was conducted by using ANSYS software and considering the interaction of pile,soil and structure.The dynamic characteristics of noise barrier structures were inve...

Calculation of Tunnel Blasting Parameters Based on Prior Knowledge and BP Neural Network

XIAO Qinghua, ZHANG Jichun, XIA Zhenrong

2007, 20(5): 537-541.

[Abstract](1761)

Abstract:
To overcome the shortcoming of the parameter design of tunnel blasting,i.e.,they are selected empirically by designers,a three-layer neural network model with an input layer,an output layer and a hidden layer was constructed.The Protodikonov’s hardness coefficient,tunnel cross-section area,practical...

Basic Study on Method of Karst Geology Forecasting Based on Fractal Theory

LI Cangsong, GAO Bo, MEI Zhirong

2007, 20(5): 542-547.

[Abstract](1380)

Abstract:
To improve the accuracy of karst geology forecasting,the fractal theory was applied.Through the analyses of macroscopic and microcosmic laws of karst,a concept,karst unit,was drawn out,and the fractal growing law of karst was described.Fractal dimension and fractal assessment index of karst were cal...

Image Texture Segmentation Based on Cloud Fuzzy Theory

WANG Zuocheng, LI Yongshu, XUE Lixia, Wang Linlin

2007, 20(5): 548-552.

[Abstract](1367)

Abstract:
To deal with the fuzziness and randomness of image textures,a vector cloud model for texture features was proposed on the basis of the cloud fuzzy theory and was successfully used to the segmentation of textural images.With this method,texture feature vector cloud is generated backward after fuzzily...

Research on Algorithm of Quadric Surface Fitting in Reverse Modeling for Mechanical Parts

TIAN Huaiwen, GUO Shizhang

2007, 20(5): 553-557.

[Abstract](1499)

Abstract:
To solve the problem of quadric surface reconstruction in reverse modeling for mechanical parts,a two-step fitting algorithm was presented.With this fitting algorithm,the objective function is built based on the coordinates of measuring points,the normal vector of each point and the geometrical feat...

Object-Oriented Modeling and Manufacturing Simulation of Virtual Flexible Manufacturing Systems

HE Yong, DING Guofu, ZHAO Shujun, ZHANG Jihui, XU Mingheng

2007, 20(5): 558-562.

[Abstract](1560)

Abstract:
In order to solve the problem of facility layout induced by resource recombination in flexible manufacturing systems,an object-oriented modeling method was proposed to construct the virtual prototype system of a flexible manufacturing system.By modeling of the geometry and behavior of each facility ...

Decoupling Method of Multidisciplinary Design Optimization Based on Sensitivity Analysis

ZHANG Jing, LI Bailin, LIU Yongjun

2007, 20(5): 563-567.

[Abstract](1748)

Abstract:
To solve the coupling complexity of MDO(multidisciplinary design optimization),coupling factors of a complex system were investigated based on the sensitivity analysis.The conception of coupling strength was presented,the membership degree function of coupling factors was defined with the method of ...

Numerical Simulation of Face Flow Field for Dry Gas Seal

WANG Heshun, CHEN Cichang, WANG Jinnuo

2007, 20(5): 568-573.

[Abstract](1711)

Abstract:
Based on the Navier-Stokes equation,the laminar model and the SIMPLEC algorithm,the numerical simulation of face flow filed under different face clearances and rotational speeds was carried out to obtain more details about the fluid field and high stability of dry gas seal.The distribution of film p...

Rail Grinding Technique and Its Application in High-Speed Railway

WANG Wenjian, CHEN Mingtao, GUO Jun, LIU Qiyue

2007, 20(5): 574-577.

[Abstract](1665)

Abstract:
On the basis of formation and development characteristics of oblique rail cracks in Guangzhou-Shenzhen railway line,the rail asymmetrical grinding was used to prevent and decrease the appearance of oblique cracks.A field grinding test and numerical calculation were carried out.The calculated results...

Flutter of Airfoil with Structural Nonlinearity in Supersonic and Hypersonic Flow

ZHENG Guoyong, YANG Yiren

2007, 20(5): 578-582.

[Abstract](1393)

Abstract:
In order to investigate the aeroelastic characteristics of a two-dimensional airfoil in supersonic and hypersonic flow,aerodynamic force on an airfoil was calculated based on the piston theory,and the governing equations were established by using the energy method.The critical flutter velocity was o...

Absolute Exponential Stability of Generalized Hopfield Neural Networks

WEN Haixia, HUANG Lixiang, ZHANG Jiye

2007, 20(5): 583-588.

[Abstract](1631)

Abstract:
The existence and uniqueness of the equilibrium point of a class of generalized Hopfield neural networks(GHNN),altogether with its absolute exponential stability,were investigated.GHNN includes Hopfield neural networks and cellular neural networks,and it is not necessary for its activation functions...

Performance Evaluation of Multi-channel Stop-and-Wait ARQ with Packet Combining

CHEN Hong, FAN Pingzhi

2007, 20(5): 589-594.

[Abstract](1344)

Abstract:
Detailed performance evaluation was presented with respect to the channel number,combining mode,packet loss ratio and transmission delay of multi-channel stop-and-wait ARQ associated with packet combining over a Rayleigh fading channel.The analysis results show that,to achieve optimal system perform...

E-Cash System for Multiple Banks Based on Restrictive Proxy Blind Signature

LU Rongbo, HE Dake, WANG Changji

2007, 20(5): 595-599.

[Abstract](1410)

Abstract:
To overcome the shortcomings of a multi-bank system based on group signature and improve efficiency,a concept called restrictive proxy blind signature was proposed,in which the restrictive assumption in blind signature was added to proxy blind signature.A fair off-line e-cash system for multiple ban...

Performance Comparison of Modulation Schemes for Atmospheric Optical Communication

ZHONG Xiaochun, HAN Jiajia

2007, 20(5): 600-603.

[Abstract](1458)

Abstract:
The performances of modulation schemes,OOK(on off key),PPM(pulse position modulation),DPPM(differential pulse position modulation) and DPIM(digital pulse interval modulation),used in optical communication over the atmospheric turbulence channel were analyzed and compared in terms of packet error rat...

Post-IDFT Multidimensional Beamforming for STC-OFDM Systems

LIU Hongwu, FENG Quanyuan

2007, 20(5): 604-610.

[Abstract](1354)

Abstract:
A post-inverse discrete Fourier transform(post-IDFT) multidimensional beamforming scheme was proposed for space-time coded-orthogonal frequency division multiplexing(STC-OFDM) systems.This scheme obtains multiple eigen mode by decomposing cross-matrix of space-frequency channels,and forms multidimen...

Modification of Reflection and Transmission Coefficients of Frequency Selective Surfaces

MENG Fanji, YANG Rugui, ZHANG Shuangwen

2007, 20(5): 611-614.

[Abstract](1383)

Abstract:
The existing reflection and transmission coefficients of a frequency selective surface(FSS) do not apply to calculation of reflection and transmission under normal incidence of waves,and need to be modified.The incident field was decomposed into two components,parallel and perpendicular to the incid...

Filtering Performances of Cascaded Mach-Zehnder Interferometer with Chirped Path Differences

ZHOU Zhi, PAN Wei, LUO Bin, ZOU Xihua

2007, 20(5): 615-619.

[Abstract](1695)

Abstract:
To enlarge the FSR and improve the band-pass filtering performances of cascaded Mach-Zehnder interferometers(MZIs),chirped path differences,rather than fixed path differences,were used based on the similarity between the principles of a cascaded MZIs and a ladder type filter.A theoretical model for ...

Multirate Extended Kalman Filter and Its Application to Speed Estimation of Induction Motors

LU Ke, XIAO Jian

2007, 20(5): 620-625.

[Abstract](1506)

Abstract:
Based on an analysis on algorithm of extended Kalman filters(EKFs) and multirate digital control systems,a multirate EKF algorithm was proposed,including the input and output algorithms.The algorithms were applied to speed estimation for induction motors.Simulation results reveal that the proposed a...

Block-Wise Kernel Partial Least-Squares Method

BAI Yifeng, XIAO Jian, YU long

2007, 20(5): 626-630.

[Abstract](1336)

Abstract:
A method of block-wise kernel partial least-squares(BKPLS) was proposed to solve the problem of dimensional explosion of kernel matrix in batch-wise kernel partial least-squares(KPLS).In the BKPLS,the batch-wise method in the KPLS is transformed into a block-wise method based on the symmetric charac...

Self-Organized Evolutionary Mechanism of Transportation Corridor

MAO Min

2007, 20(5): 631-635.

[Abstract](1354)

Abstract:
A transportation corridor was defined in terms of transportation and regional economy,and its basic structure was analyzed based on the social-technical theory.A transportation corridor was regarded as a biome,and its evolutionary process was elaborated.A 4-phase life cycle model was proposed to des...

Overbooking Model of Ocean Shipping Container under CVaR

YANG Chenghu, DU Wen, WANG Cuihong

2007, 20(5): 636-640.

[Abstract](1462)

Abstract:
Conditional value-at-risk(CVaR) was applied to a study on overbooking problem of ocean shipping containers.An overbooking model of ocean shipping containers was proposed in the CVaR framework,and a set of equations for optimal overbooking levels were obtained by solving the model.The effects of risk...

Model and Algorithm for Shortest Path of Multiple Objectives

HAO Guang, ZHANG Dianye, FENG Xunsheng

2007, 20(5): 641-646.

[Abstract](1941)

Abstract:
To obtain acceptable shortest paths,which meet the decision-maker’s requirements,for a multi-objective shortest path problem,a model and a polynomial algorithm were presented.The algorithm is a combination of a k-shortest path algorithm and a multi-objective lattice-order decision-making method.In t...

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2007 Vol. 20, No. 5