西南交通大学学报

Field Experimental Research on Bearing Capacity of Cast-in-Situ Piles in Xigeda-Rock

WU Xingxu, ZHUANG Weilin, JI Suiwang, XIONG Guobin

2006, 19(6): 669-674.

[Abstract](1717)

Abstract:
To provide a reference for the design of pile foundations of bridges on the Xichang-Panzhihua expressway being constructed,the static loading tests and researches on the axial bearing capacity of 13 cast-in-situ piles set in Xigeda-rock were carried out at Xinjiu in Panzhihua and at Puba in Dechang....

Application of Fractal Cellular Automata to Self-Organized Criticality

SU Fenghuan, YAO Lingkan, GAO Zhaoning

2006, 19(6): 675-679.

[Abstract](1591)

Abstract:
Based on a fractal cellular automata model,the mechanism of self-organized criticality(SOC) of granular mixtures was investigated.The present sandpile experiments with an one-side slope show that the self-organized criticality of granular mixtures is strongly influenced by the non-uniform degree of ...

Numerical Simulation of Ground Vibration Effects in Shallow Tunneling Blasting

CAO Xiaojun, ZHANG Jichun, LU Helin, GUO Jianqun

2006, 19(6): 680-684.

[Abstract](1839)

Abstract:
By taking a shallow tunnel on the Yuhuai railway as the research object,ground vibration induced by blasting was simulated numerically using a dynamic finite element method.In the established numerical model,the ground and excavating boundaries are regarded as free ones,others as fixed ones,and a me...

Proper Orthogonal Decomposition-Based Simulation of Spatially Correlated Seismic Ground Motions

HU Liang, LI Li, FAN Jian

2006, 19(6): 685-689,695.

[Abstract](1384)

Abstract:
By combining with the modal truncation technique,the simulation formulas for proper orthogonal decomposition(POD) based on the spectral representation method were derived.Then,a stochastic model for the spatial variation of seismic ground motions was proposed,and the simplified simulation formulas w...

Updated Lagrangian Co-rotational Formulation for Geometrically Nonlinear FE Analysis of 3-D Beam Element

ZHOU Lingyuan, LI Qiao

2006, 19(6): 690-695.

[Abstract](1834)

Abstract:
To improve the precision and efficiency of computations for a structure with a large displacement and rotation,an updated Lagrangian co-rotational formulation for geometrically nonlinear FE(finite element) analysis of 3-D beam elements was proposed.With this method,a standard updated Lagrangian form...

Model and Simulation of Angel of Two-Degree of Freedom for Overhead

ZHANG Zeqiang, CHENG Wenming, ZHONG Bin, TANG Liansheng

2006, 19(6): 696-699.

[Abstract](1709)

Abstract:
To precisely position the load and promptly stop load swing for overhead and gantry cranes,the swing of load and the influencing factors were investigated.A 2-degree of freedom model of load swing angel was derived based on 3-dimensional dynamic equations of the trolley-load system.Dynamic simulatio...

Finite Element Analysis of Vertical Stiffness of Air Spring System

LIU Zenghua, LI Fu, HUANG Yunhua

2006, 19(6): 700-704.

[Abstract](1816)

Abstract:
The vertical stiffness problem of an air spring system was formulated for finite element analysis,and the nonlinearity of the material,geometry and state,as well as the air-solid coupling,were analyzed theoretically.Finite element model of an air spring system was established with the commercial sof...

Goodman-Smith Diagram for Fatigue Reliability Design of Grade B Cast Wheel Steel

CHEN Lei, ZHANG Zimao

2006, 19(6): 705-708.

[Abstract](1916)

Abstract:
To obtain fatigue design data under different reliabilities for grade B cast wheel steel for railway vehicles,a Goodman-Smith diagram of the steel was obtained using probabilistic mechanical properties,fatigue limits,and the data available in S-N curves of the steel covering mid-and-long fatigue liv...

Surface Morphology and Photoluminescence Properties of ZnO Films Deposited with PLD

LI Jianhua, GOU Zhijian, FAN Ximei

2006, 19(6): 709-712.

[Abstract](1363)

Abstract:
ZnO films were deposited on a Si(111) substrate by laser ablation of a Zn target in oxygen reactive atmosphere.Nd-YAG laser with wavelength of 1 064 nm was used as the laser source.The structure and surface morphology of the deposited ZnO films were characterized with XRD(X ray defraction) and FESEM...

QoS Guaranteed Call Admission Control Strategy for CDMA Networks

FANG Xuming, ZHANG Dandan, ZHU Longjie

2006, 19(6): 713-718.

[Abstract](1634)

Abstract:
To fully meet the requirements of multimedia for CAC(call admission control) mechanisms in CDMA(code division multiple access) systems,a method of calculating the residual capacity was investigated,and a QoS(quality of service) guaranteed dynamic CAC scheme was proposed.The analytical and simulated ...

Clustering Method Combining Threshold Algorithm with Ant Colony Algorithm

YANG Yan, ZHANG Zhaotao

2006, 19(6): 719-722,742.

[Abstract](1833)

Abstract:
To improve the quality of clusting analysis,a novel clustering method combining the threshold algorithm with the ant colony algorithm was proposed.With this method,the center and number of clustering are determined by using the clustering algorithm based on threshold,and then the above clustering re...

Mel-Spectral Distortion Measure Based on Perception Model for Objective Speech Quality Assessment

CHEN Huawei, JIN Fan

2006, 19(6): 723-728.

[Abstract](1515)

Abstract:
In order to assess speech quality effectively,a new approach of feature extraction of speech signals,MFSC(Mel-frequency spectral coefficient),was proposed on the basis of the speech perception model.This approach considers both the perceptual nonlinear relation between sound intensity and loudness a...

Cloud Theory-Based Genetic Algorithm

DAI Chaohua, ZHU Yunfang, CHEN Weirong

2006, 19(6): 729-732.

[Abstract](1826)

Abstract:
To overcome the shortcomings of a genetic algorithm(GA).i.e.,low convergence speed and easily getting a local optimum solution,a novel genetic algorithm,cloud theory-based genetic algorithm(CGA),was proposed.CGA is based on both the idea of GA and the properties of randomness and stable tendency of ...

Predictive Fuzzy Control Based on Recurrent Neural Network

DU Fuyin, XU Yang

2006, 19(6): 733-736,747.

[Abstract](1731)

Abstract:
Recurrent neural network can forecast future output of plant,based on the function,it can be achieved to predict next sampling period change-of-error.Based on the current error and predictive change-of-error,predictive fuzzy control output of fuzzy logic controller could be obtained by general fuzzy...

Protection of Impedance-Matching Balance Traction Transformer Based on Transformer Model

GUO Lei, GAO Shibin, LI Qunzhan

2006, 19(6): 737-742.

[Abstract](1382)

Abstract:
To identify inrush currents and short-circuit currents caused by internal faults,the transformer protection principle based on the transformer model was used for impedance-matching balance traction transformers(IMBT).By analyzing the electromagnetic characteristics of IMBT,voltage balance equations ...

Development of DCPD Detection Instrument for High-Voltage Storage Capacitor

ZHANG Xueqin, WU Guangning, QU Yanning, SHU Wen, RAN Hanzheng

2006, 19(6): 743-747.

[Abstract](1473)

Abstract:
Based on the RLC balance resistance detection and Δt(time interval between two consecutive discharges) analysis techniques,a DCPD(direct current partial discharge) detection instrument for high-voltage storage capacitors was developed to estimate the performance of a high-voltage storage capacitor.T...

Fly-by-Light Point-to-Point Line of Nap-of-the-Earth Flight Control System for Helicopter

MEI Jinsong, YANG Yidong, WANG Xinhua, CHEN Dongmei

2006, 19(6): 748-752.

[Abstract](1314)

Abstract:
In order to achieve the fiber-optical communication with different speeds and data formats,a fly-by-light point-to-point link scheme based on serial communication was proposed.By taking the flight control system of a helicopter as an example,a semi-physical simulation platform was constructed,includ...

Quantitative Assessment Method for Severity Classification of Air Traffic Control Incidents

YANG Changqi, WEI Guangxing

2006, 19(6): 753-757.

[Abstract](1931)

Abstract:
Severity classification of ATC(air traffic control) incidents was studied with the AHP(analytic hierarchy process) method and by combining the existing assessment methods and the civil aviation rules of China.The factors influencing ATC incidents include vertical separation,horizontal separation,fli...

Product Delivery Plan Based on Making to Order

SHU Liangyou, YAN Qipeng

2006, 19(6): 758-763.

[Abstract](1426)

Abstract:
To respond to customer’s needs and minimize the delivery cost of product under an MTO(make to order) operation environment,customer’s waiting time and delivery costs of product were analyzed,and a non-linear model was derived for minimizing the total costs,including those in product storage,customer...

Side Payment Mechanism for Design Outsourcing under Incomplete Contract

HAN Jianjun, CHENG Y, GUO Yaohuang

2006, 19(6): 764-768.

[Abstract](1564)

Abstract:
To increase the profit of project owners,a side payment mechanism was proposed for a design outsourcing system composed of one project owner and two design contractors.The influences of the proposed mechanism on the profit of the project owner under an incomplete contract was analyzed using game the...

Pareto Improvement to Return Model in BOT Project

ZHAO Lili, TAN Deqing, HUANG Qing

2006, 19(6): 769-773.

[Abstract](1079)

Abstract:
A traditional return model of the BOT project was derived based on the principle-agent theory.Analysis of the mode indicates that the agent(project company) will not chose an action favorable to the principal(government).This is because the traditional contract does not meet the agent’s participatio...

Design of Flexible Mechanism for Multi-Agent Based on Virtual Enterprises

JIA Diancun, WANG Bo

2006, 19(6): 774-778.

[Abstract](1499)

Abstract:
Introduction of an incentive and constraint mechanism to the contract for a multi-agent based virtual enterprise is a measure to reduce the rigidity in the contract to a certain extent.To reduce the rigidity further,it is necessary to design a flexible mechanism.An incentive and constraint mechanism...

Method of Optimal Allocation of Monitoring Efforts for Water Pollution Accident Source

LIU Ying, LIU Dan, YANG Miao

2006, 19(6): 779-782.

[Abstract](1474)

Abstract:
To fully utilize limited monitoring resources,the optimal distribution model was derived by using the optimal search theory to detect the source of suddenly occurred water pollution in a river basin under the condition that the detection function for normal pollution accidents is an exponential func...

Characteristics and Sources of Atmosphere Aerosols in Chengdu Industrial Park

LIU Jing1, ZHANG Jianqiang, ZHANG Yuyu

2006, 19(6): 783-787.

[Abstract](1039)

Abstract:
The phase components,contents of major elements and microelements,surface character-istic and size of atmospheric aerosols in the Chengdu industrial park were investigated by using inductively coupled plasma atom emission spectroscopy (ICP-AES),X-ray diffraction(XRD),Fourier transfer infrared spectr...

Experimental Study on Micronucleus in Root-Tip Cells of Vicia faba Induced by Three Pesticides

TANG Zhengyi, HU Rong, QING Donghong, HUANG Zuoxi

2006, 19(6): 788-792.

[Abstract](1243)

Abstract:
Micronucleus(MCN) test of Vicia faba root-tip was conducted to study the mutation inducing effect of three pesticides: methamidophos(Me),thiophanate-methyl(Th) and moroxydine hydrochloride(Mo) in their normally used concentrations.When each of the three pesticides is used alone,the micronucleus freq...

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2006 Vol. 19, No. 6