西南交通大学学报

Axioms for Lattice Ordered Decision-Making Behavior and Relative Utility Theorem

GUO Yao-huang, LIUJia-cheng, ZHOUWen-kun

2001, 14(3): 221-224.

[Abstract](1198)

Abstract:
In this paper, the connectivity (completeness) axiom and the continuity axiom inVonNeumann- Morgenstern Rational behavior axioms are weakened. Then, a set of axiom for lattice ordered decision- making behavior, which can describe the decision-making behaviormore rationally, is constructed. At last, the relative unique existence theorem for (linear) utility function is obtained.

The Problem ofφ-Frequency Closed Itemset Mining and Its Algorithm

LITian-rui, XUYang, PANWu-ming

2001, 14(3): 225-228.

[Abstract](1148)

Abstract:
Association rule mining is an important research area in data mining, andφ-association rule mining is one of its generalizations. Based on closed itemset, a problem of ((frequent closed itemset is studied, which is a substitute of the problem ofφ-association rule mining. Also, a mining algorithm is presented, which can efficientlysolve the problemofgeneratingtoomanyrules inφ-association rule mining.

Generalization of the Accurate Hayman Inequality

TANGLin-yong

2001, 14(3): 229-231.

[Abstract](791)

Abstract:
The accurateHayman inequality is generalized in this paper based on theNevanlinna theory. The constants of the counting function in the original inequality are converted into a transcendental entire function to obtain another form of the Hayman inequality.

Multi-Attribute Group Decision-Making Method under Fuzzy Preferences

ZHOUWen-kun, WUZhen-ye, LIUJia-cheng

2001, 14(3): 232-234.

[Abstract](1212)

Abstract:
Fuzzy and multi-attribute conditions exist widely in the decision-making environments. It has been research interesttomake the two complex conditions be a simple and distinct relation, the theory about which, however, is not satisfactory. In this paper, the properties of consistent matrix under fuzzy preferences are studied, and two necessary and sufficient conditions for the equivalence between fuzzy consistent matrix and fuzzy compensation matrix are proved. The multi-attribute group decision-making method under fuzzy preferences is proposed based on the analysis. The effectiveness of the method is shown with a practical example

A Study on Development Strategies of Passenger Traffic in Metropolises of China

CHENShang-yun, GAO Shi-lian

2001, 14(3): 235-239.

[Abstract](1249)

Abstract:
The distance distribution of urban-trip volumes is estimated by utilizing Erong distribution model as a basis of the study on development strategy of passenger traffic in metropolises of china. By quantitatively and qualitatively analyzing the characteristics of different traffic modes, the methods to choose optimized combination of traffic modes are proposed. The traffic development strategies for metropolises of china are put forward.

Design and Implementation of an Adjusting System of Computerized Train Graph Systems

NIShao-quan, L Hong-xia, LIUJi-yong

2001, 14(3): 240-244.

[Abstract](1392)

Abstract:
The adjusting system is an important subsystem of a computerized train graph system that is a technique to meet the requirement of the market economy. In this paper, the functions of the adjusting system are discussed, and the detailed design and optimization of its graphic visualization of the software are presented. This subsystem has been used by some

Study on Rational Distance between Stations of High-Speed Railways

LIUhua

2001, 14(3): 245-249.

[Abstract](1868)

Abstract:
To begin with, the distribution of stations of high-speed railways in foreign countries and in China, such as Beijing-Shanghai high-speed railway and Qinghuangdao-Shenyang passenger special line, is introduced. Then, based on this, the rational distances between stations of high-speed railways are analyzed in viewof the actual situation of railway stations of China, carrying capacity and the ratios of the number and speed of high-speed trains to those ofmoderate-speed trains, and so on. According to the time intervals between trains spaced by automatic block sign, different distances between stations are suggested.

Research on thep-Center Location Problem Based on Service-Oriented Logistics Strategy

YUANQing-da, CHENXu-mei, LIQing-song

2001, 14(3): 250-254.

[Abstract](1339)

Abstract:
This paper begins with an introduction of the concepts of logistics strategy and graph center. Then, for the service-oriented logistics strategy, it abstracts the location problem of multi-distribution centers in large-scale distribution network as ap-center problem of graph, and proves that both vertexp- center problem and absolutep-center problem have the vertex solution with 2 degree of approximation. Finally, based on the theorem, a polynomial 2-approximation algorithm for the location problem is presented.

Comparison of Mental Workload Evaluation Techniques Based on the Driving Environment with Navigation System

WANGDong-guang

2001, 14(3): 254-257.

[Abstract](1124)

Abstract:
For pilots and drivers in ITS (intelligent transportation system), the high density of information in driving environments with advanced technology generates some requests for workload evaluation techniques. In this paper, four typical subjective mentalworkload evaluation techniques are reviewed. With the four methods, the evaluation calculations on the data of experiments in three different driving environments are made. The calculated results are compared by sensitivity analysis aswell as the subjective evaluation of participants, and the regression functions ofRNASA-TLX indexes forthe three different driving environments are set up.

Dynamic Behavior of Structure-Liquid System of Hydraulic Turbines

YUJian-hua, WEI Yong-tao, CAOJian-mian

2001, 14(3): 258-263.

[Abstract](1450)

Abstract:
This paper discusses the free vibration governing equations of a coupled systemwith the emphasis on the calculation of dynamic water pressure vectors and the added mass matrix. It also makes a brief introduction about the solution of the dynamic behavior of structures under water medium. The calculation results obtained from a practical example are presented, which showthat the basic frequency of the turbine obtained with the structure-liquid coupling effect taken into consideration is less than that without the coupling effect, and that all the modes of vibration are obviously different from each other.

A Laboratory Study on the Effect of Axle-Load on the Wear of Wheel and Rail on Tangent Track

JINXue-yan, WANGXia-qiu

2001, 14(3): 264-267.

[Abstract](1271)

Abstract:
The railwaywagonwith different axle-loads running on 60 kg/mPD-1 tangent rail is simulated in laboratory, and the effects of axle-load on the wear of wheel and rail are analyzed. Experimental results showthatthewearratioofwheel and rail under25 t axle-load is obviously largerthan thatunder21 t and 23 t axle loads respectively. So, under the present railway standard, it is not appropriate to increase the axle- load of railwaywagon from 21 t to 25 t in China.

A Channel Borrowing Assignment Strategy with Directional Locking in Mobile Communication Systems

FANGXu-ming, ZHUChang-qian, FANPing-zhi

2001, 14(3): 268-271.

[Abstract](1231)

Abstract:
The authors propose an optimized compact pattern based channel borrowing assignment (CPCB) strategy, that is, the compact pattern based channel borrowing assignment strategy with directional locking (CPCBDL). This strategy notonly introduces the advantage of directional channel locking concept, but also optimizes the mechanism of channel management. Simulation is done in a universally used network. The system performances under a kind of uniform and two kinds of non-uniform traffic distributions. The simulation results show that the CPCBDL performances are superior to those of FCA, BDCL and CP based DCA, etc., and even outperform those of CPCB. This improvement is very important to improving the spectrum efficiency and throughput in cellular communication systems.

Study on Fault Diagnosis of Sliding Bearings Using AE Signals

QINPing, YANBing, TANDa-ming

2001, 14(3): 272-275.

[Abstract](1193)

Abstract:
Acoustic emission (AE) is used to detect contacting fault of sliding bearings. The contacting fault was simulated on a sliding bearing bygradually reducingthe oil supply until no oil being supplied. AE signalswere recorded during the simulation for analysis. The results indicate that AE signals are sensitive and quick response to the changes in theworking condition of sliding bearings, good in anti-disturbance and easy to install, showing a prospect to be applied to fault diagnosis of sliding bearings.

AnM-Band Wavelet Base Construction Method and Its Application

HE Zheng-you, LIUZhi-gang, QIANQing-quan

2001, 14(3): 276-280.

[Abstract](1398)

Abstract:
The traditional wavelet transform has some limitations in analyzing transient signals, which are accompanied by high frequency carriers. These limitations can be overcome byM-band wavelet transform. The construction conditions ofM-band wavelet base are discussed. Then, a newM-band wavelet base construction method based on cosine modulated perfect reconstructing filter group is proposed. A 6-band wavelet base is constructed, its time and frequency characteristics are studied, and the local discharge transient signals are analyzed. The wavelet transform results of the transient indicate the advantages of the proposed method.

A Fault Diagnosis of Dynamic Systems Based on Unknown Input Observer Schemes

WANGJue, LI Zhi

2001, 14(3): 281-285.

[Abstract](1319)

Abstract:
The principle and design procedure of unknown input observer schemes for fault diagnosis of dynamic systems are described in this paper. For discrete linear time invariant systems, detailed deduction is given to the algorithm of observer design based on the Kronecker canonical form transformation of matrix pencil. The resulted observer is sensitive to specific faults and is uncoupled from other unknown inputs. Recursively using the above procedure gives a scheme of observers, which realizes the robust fault detection and isolation for dynamic systems. The problems about the method are also discussed.

Maximum Superiority Searching Method

GONGHui, QIANG Shiz-hong

2001, 14(3): 286-290.

[Abstract](1376)

Abstract:
Amaximum searching method, specially designed for searching strategies of expert systems, is presented in this paper based on the study of half scenery method. Avoiding unnecessarily obtaining the existencesituations of all the original data nodes of”OR”type required by half scenery method, the maximum superioritysearchingmethod is able to further improve the efficiencyof solving problems bytracing the superiority of all the expected solutions.

The Application Technology of VRML to Distant Graphic Education Software

WENJun-wen, FENGKai-ping

2001, 14(3): 291-293.

[Abstract](1263)

Abstract:
With practical examples of implementation, this paper introduces the key techniques of virtual reality in simulating real scene, real-time interactive behavior and constructing interactive interface based on web. The situation that users can only do their learning by passively following the model and animation designed by the software programmer is changed. It presents a successful sample for developing the interactive distant education software of engineering graphics.

Study on the Nonlinear Dynamic Behavior of Tall Piers of Railway Bridge

SHENHuo-ming, XIShao-zhong

2001, 14(3): 294-298.

[Abstract](1268)

Abstract:
The nonlinear partial differential equations forthe tall piervibration of railwaybridges are derived by taking the influence of geometric nonlinearity into consideration, i.e., considering the nonlinear term caused by the direction change in axial forces and internal forces. Based on the analysis of the solution conditions ofthe equations, the vibration frequencies of a tall pierbefore and after erectingthe bridge beam, and the displacement changing pattern of the pier top are discussed. And the obtained results are compared to those by linear analysis and bythe nonlinear analysis of the forced vibration on a non-autonomous system.

A Review of Aerodynamic Admittance Functions of Bridge Structures

JIANG Yong-lin, LIAOHai-li, QIANG Shi-zhong

2001, 14(3): 299-302.

[Abstract](1506)

Abstract:
Buffeting responses of structures are excited by buffeting forces, which are determined by the aerodynamic admittance function (AAF) of structures and power spectrumdensity of turbulence., the Sear’ s function, which is based on the strip assumption, fails to accountforthe coherence ofthe turbulence along the span. It is shown by the analysis that 3-dimensional AAF (3DAAF) is affected by the dimensions of the structure, the characteristic of the turbulent field and the reduced frequencies. The taut-strip test also shows that 3DAFF accords betterwith the facts met in civil engineering.

An Accurate Calculation Method for Erecting Curves of Wire Strands of Long Suspension Bridges

TANGMao-lin, SHENRui-li, QIANG Shi-zhong

2001, 14(3): 303-307.

[Abstract](1445)

Abstract:
According to the conditions and practices of suspension bridge erection, a method is proposed for accurate calculation of erecting curves of wire strands of long suspension bridges. By analyzing the conditions of equilibrium on the saddleswhile the wire strands are being erected, the theoretical calculation method of the pre-displacement, which is the desired position of saddles, is developed. The proposed method takes the non-linearity of the wires into consideration, avoids the errors resulted by suppositions in finite element method, and is more accurate than finite element method.

On Ecological Environment Problems and Effects Caused by Discharge from Huayingshan Tunnel

LIUDan, YANGLi-zhong, YUSu-jun

2001, 14(3): 308-313.

[Abstract](1297)

Abstract:
On the basis of author’s two on-the-spot consultant experiences and the collected data, this paper discusses ecological environment problems, such as groundwater resources loss, poor coal-measure water intrusion and hydrologic cycle unbalance, which are caused by discharge from the tunnel, and their formation mechanisms. It also discusses a series of negative effects resulted, such as karst spring water depletion, groundwater degradation, surface water pollution and soil erosion. Analysis results showthat the long-term discharge of the tunnel will produce large-scale cone of depression, and that the expansion of the cone will lead to the happening of intense hydrogeochemical action in drainage belt, hence bringing a threat to the stability of the tunnel lining.

The Coupling Interaction of Groundwater-Soil-Rock Mass in Karst Collapse Evolution

WANGJian-xiu, YANGLi-zhong, HEJing

2001, 14(3): 314-317.

[Abstract](1387)

Abstract:
The physical and mechanical interaction of groundwater-soil-rock mass in karst collapse evolution is discussed elaborately and a coupling mode is established and studied. Analysis results show that the evolution of karst collapses connects closelywith the coupling interaction ofgroundwater-soil-rockmass. The material carrierof collapses is the covering soil mass and the rock’s top layer, and the groundwater is stored in the soil-rock mass. Complicated physical, chemical and mechanical interactions exist between the groundwater and the soil-rock mass, while stress and mass transfer exists between soil and rock masses. On the other hand, the change in soil-rock mass’s structure and stability will influence groundwater’s movement, and the change of groundwater’s movement influences soil and rock mass’s structure and stability state in reverse, until the appearance of karst collapses.

The Analysis and Calculation of Starting Conditions for the Loose Matters to Form Debris Flow

BAI　Zhi-yong

2001, 14(3): 318-321.

[Abstract](1341)

Abstract:
According to the characteristic that most of the loose matters consolidate to a certain extent, the author studied the effects of the factors on the formation of debris flows, such as ditch grade, crest discharge, saturation resistance to shear and shear area of the loose matters. The discriminants for the loose matters to start are proposed. An application of the proposed method to some ravines along the Chengdu- Kunming railway line is presented.

Model Test of the Effects of Geocells and Geonets on Subgrade Strengthening under Static Loads

CAOXin-wen, LUO Qiang, XUEShuang-gang

2001, 14(3): 322-326.

[Abstract](1451)

Abstract:
The mechanismof subgrade strengtheningwith geocells and geonets is discussed. To compare the effects of geocells and geonets on subgrade strengthening under static loads, full scale model tests were conducted for different subgrade structures. It is shown that geocells are better than geonets, although both can improve the performances of subgrades.

Finite Deformation Analysis with Hybrid/Mixed Finite Element Method

ZUO De-yuan, CHENDa-peng

2001, 14(3): 327-331.

[Abstract](1386)

Abstract:
A modified Reissner-type incremental variational functional is proposed by adopting a updated Lagrangian description. The variational functional involves displacements and second Piola-Kirchhoff stress increments as independent variables. To enhance computational efficiency, the mechanical subelement model is adopted to describe nonlinear material behaviors. Three example problems are solved to test the proposed method, and the reliability and effectiveness are illustrated by the results.

Statistical Analysis of Pile Ultimate Bearing Capacity and Pile Reliability

PENGXiong-zhi, LUO Shu-xue, ZHAO Shan-rui

2001, 14(3): 332-335.

[Abstract](1582)

Abstract:
Statistical analysis on the bearing capacity of 78 bored piles and 128 drilled piles and on the normalized parameters of these piles’end and side resistancewas carried out. It is found out by comparison that the ratios of the measured values to the calculated ones of the bearing capacity, the end resistance and the side resistance conform to lognormal distribution. Meanwhile, the total piles’reliability indexes are calculated by calibration method, with a result showingthatthe reliabilityof the bored piles is 4.11 and the drilled piles 4.56.

Search Advance Search

Journal Search

Search Type

NewsMore

instruction for authors

Read this journal

LinksMore

2001 Vol. 14, No. 3