西南交通大学学报

Field Investigation and Structural Integrity of Asphalt Pavement in Cold Regions

QIU Yanjun, AI Changfa, HUANG Bing, LAN Bo

2009, 22(2): 147-154.

[Abstract](2784)

Abstract:
Severe weather and weak environment have a significant influence on the long term performance of asphalt pavement structures in the Tibet Plateau and surrounding areas such as west Sichuan,north Yunnan and Qinghai Province.Current design specification based on the calibration of field investigation ...

Hierarchical Decentralized Robust Control Method of Uncertainty Structure Vibration

DUAN Zhongdong, ZHOU Qingsheng

2009, 22(2): 155-159.

[Abstract](2628)

Abstract:
Based on the linear matrix inequality,a hierarchical decentralized state-feedback controller was given to resolve the vibration control of an uncertainty building structure.Active control experiments were constructed by a Matlab/xPC real-time control system,and half physical real-time data acquisiti...

Identification Method of General Sub-structure for Damage Location of Complex Structures

ZHANG Yuzhi, LI Qiao, SHAN Deshan

2009, 22(2): 160-165.

[Abstract](2104)

Abstract:
In order to improve the identification effect for damage location of complex structures,a multi-step identification method was adopted.With this method,the damaged sub-structure can be found after a structure is decomposed into several sub-structures,then the damaged element in the sub-structure can...

Experimental Investigation on Ultimate Load-Bearing Capacity of PBL Shear Connectors

XIA Song, ZHAO Canhui, ZHANG Yuzhi, LI Qiao

2009, 22(2): 166-170.

[Abstract](2246)

Abstract:
A test was carried out to investigate the characters of perfobond rib(PBL) shear connectors subjected to combined tension and shear background stresses.Twelve specimens of PBL shear connectors,sorted into 4 groups,were designed,and their ultimate load-bearing capacities and slipping behaviors were i...

Predictive Model for Seismic Damage of Transportation System in Mountain Cities and Its Application

LI Yingmin, WANG Liping, LIU Liping

2009, 22(2): 171-176.

[Abstract](1965)

Abstract:
Based on the improvement of the existing predictive models,a predictive model for the seismic damage of transportation systems in mountain cities was established to reasonably predict the seismic damage.The improvement is mainly based on the characters of roads,landforms and buildings in mountain ci...

Experimental Investigation on Triaxial Frost Heaving Stress-Strain Relationship of Saturated Clay

SUN Bing, QIU Wenge, ZHOU Chao

2009, 22(2): 177-180,268.

[Abstract](1821)

Abstract:
To probe into the mechanical performances of soil during the freezing,the relationship between frost heaving strain and stress of saturated clay frozen under different constrains was investigated experimentally,and triaxial frost heaving stress-strain relationship was presented.The research results ...

Nonlinear Least Squares Adjustment Based on Improved Homotopy Algorithm

YOU Wei, FAN Dongming

2009, 22(2): 181-185.

[Abstract](1736)

Abstract:
Based on the homotopy idea,an improved homotopy algorithm was proposed in order to search a more efficient algorithm for nonlinear least squares adjustment.This algorithm directly transforms the rule of nonlinear least squares adjustment into the rule of homotopy least squares adjustment,and the rul...

Bandwidth Optimization Algorithm of Finite Element Models at Level of Degree of Freedom

WANG Jialin

2009, 22(2): 186-189.

[Abstract](2706)

Abstract:
Based on the fact that the numbers of degree of freedom(DOF) of nodes participating in the DOF vector of structures are not the same,an algorithm was proposed to optimize the bandwidth of finite element models at the level of DOF to raise the calculation speed of finite element analyses.In this algo...

Isoplanatic Angles of Single-and Dual-conjugate Adaptive Optics Systems in Lidar

RONG Jian, DING Xueke, ZHONG Xiaochun

2009, 22(2): 190-194.

[Abstract](1557)

Abstract:
To improve the detective ability of air-borne and ground laser lidar systems,the expressions of isoplanatic angles of single-and dual-conjugate systems were deduced.The selections of conjugation height for lidar systems were discussed,and the isoplanatic angles of single-conjugate,dual-conjugate and...

Multi-component Emitter Signal Analysis Method Based on Reassigned S-method

RONG Haina, ZHANG Gexiang, JIN Weidong

2009, 22(2): 195-200.

[Abstract](1719)

Abstract:
To effectively detect and recognize multi-component emitter signals,a multi-component emitter signal analysis method based on the reassigned S-method(RSM) was proposed.To suppress the serious cross-terms of the Wigner-Ville distribution and cut down its high computational complexity,RSM was adopted ...

Design Model for Peer-to-Peer Negotiating Multi-agent System

TONG Xiaoyang, WANG Xiaoru

2009, 22(2): 201-207.

[Abstract](1849)

Abstract:
A novel design pattern was proposed to solve the design problem of a peer-to-peer negotiating multi-agent system.The architecture of the multi-agent system was constructed,and the formalization expressions of cooperating relations and interactions among peer-to-peer negotiating agents were given.The...

Classification of Voltage Disturbances Based on Mathematical Morphology and Dynamic Time Warping

ZHAO Jing, HE Zhengyou, WANG Lixia, QIAN Qingquan

2009, 22(2): 208-214.

[Abstract](1746)

Abstract:
A novel algorithm based on the mathematical morphology and the dynamic time warping was proposed for improving the accuracy of voltage disturbance classification.In this algorithm,firstly,a morphological filter is utilized for disturbance signals’ filtering;secondly,feature extraction of the filtere...

GW-Level High-Power Radial Line Helical Array Antenna

LI Xiangqiang, ZHAO Liu, CHEN Xiaobo, LIU Qingxiang

2009, 22(2): 215-220.

[Abstract](1688)

Abstract:
In order to raise the power-handling capacity of a high-power radial line helical array antenna and realize the directional radiation of GW-level high-power microwaves,a GW-level 4-ring 48-element radial line helical array antenna using H-coupled probes was designed based on the improvements of elem...

Adaptive Transmission Error Concealment Algorithm for Enhancement Layer of SNR Scalable Video Coding

DENG Yun, PENG Qiang, ZHU Changqian

2009, 22(2): 221-225.

[Abstract](2005)

Abstract:
The characteristics and applicable situations of two common and effective error concealment methods were analyzed.An adaptive transmission error concealment algorithm for the enhancement layer in SNR scalable video coding(SVC) was proposed based on distortion estimation.The proposed algorithm estima...

Printer Calibration Based on B-spline Tensor Product

WANG Yifeng, ZENG Ping, LIU Ruihua

2009, 22(2): 226-231.

[Abstract](1551)

Abstract:
To ensure consistent color reproduction from device to device,a color calibration algorithm for printers was proposed.A printer calibration model was constructed,and printer characteristics were analyzed.A B-spine tensor product was used to describe the color nonlinearity of printers.Finally,fast co...

Nonlinear Control of PWM Rectifier Based on Bilinear System Theory

GUO Yuanbo, ZHANG Xiaohua, CHEN Hongjun

2009, 22(2): 232-237.

[Abstract](1935)

Abstract:
A bilinear model of PWM rectifier was presented based on the bilinear system theory,and it was transformed into an exact linear model by analyzing the system model and choosing proper control inputs.A double closed loop control system was designed in three-phase stationary reference frame.It has a n...

Methods to Improve Classification Performance of Wide-Band Detection System for Partial Discharge Pulse Signals

SI Wenrong, LI Junhao, GUO Hong, LUO Yongfen, LI Yanming

2009, 22(2): 238-243.

[Abstract](1938)

Abstract:
Wide-band detection and classification techniques based on pulse waveshapes were developed to detect and classify multi-PD(partial discharge) sources and suppress random interference signals,with which it is difficult for the conventional PD measurement systems to deal.Approaches,including threshold...

On-Line Identification Method for Critical Buses of Power System Voltage Stability

LIAO Guodong, WANG Xiaoru

2009, 22(2): 244-248.

[Abstract](2411)

Abstract:
The parameters of an equivalent single source system were computed on-line based on bus voltages and inject currents in the adjacent regions of monitored buses,in which the equivalent loads are affected only by the loads in the surrounding grid.Based on the equivalent model,a load margin index was u...

Principle and Key Techniques of Rodless Drilling Rig

HU Changsheng, LI Guixian, ZHAO Weimin, MA Qiang

2009, 22(2): 249-253.

[Abstract](1435)

Abstract:
The rodless drilling rig was introduced in terms of its operational principle,basic structure,the motions of the guiding and supporting board and the forces acting on it,and the method to realize self-locking for the guiding and supporting device.Trial drilling test and simulation results illustrate...

Effect of Curve Radius on Rolling Contact Fatigue Properties of Rails

ZHONG Wen, WANG Wenjian, SONG Shuqi, HU Jiajie, LIU Qiyue

2009, 22(2): 254-257.

[Abstract](2255)

Abstract:
The effect of curve radius on the rolling contact fatigue properties of PD3 and U71Mn rails was investigated on JD-1 wheel/rail simulation facility with different attack angles.The results indicate that with a decrease in curve radius the wear volume of rail roller increases,and the plastic flow lay...

Design Process Generation of Control Strategies Based on Function-Process Mapping Methodology

LIU Weiguo, LIU Gequn

2009, 22(2): 258-263.

[Abstract](1884)

Abstract:
A detailed implementation for function-process mapping was presented to generate design process for control strategies.Workflow Petri net is adopted as the knowledge representation of design process of control strategies.The required design process is generated by searching the reachability graph.Th...

Influences of Boundary Conditions on Critical Velocity in Tunnel Fire Model Test

LI Yingzhen, LEI Bo

2009, 22(2): 264-268.

[Abstract](1923)

Abstract:
To investigate the influences of boundary conditions on critical velocity,tunnel fire model test was carried out with and without water spray to cool the tunnel walls near the fire source.The results indicate that water spray increases heat loss due to strong convection and radiation near the fire s...

Effects of Harmonic Torques of Asynchronous Traction Motor on Locomotive Dynamics

ZHAO Huaiyun, LIU Jianxin, ZHAI Wanming

2009, 22(2): 269-273.

[Abstract](2144)

Abstract:
Through analyzing the harmonic torques of asynchronous traction motors of a locomotive,the formulas of calculating the harmonic torques were derived,and a dynamic model for locomotives was established.The tangent dynamics and curve negotiating dynamics of locomotives were simulated.The simulated res...

Activity Pattern Choice of Work Commuting Trip by Workers

YANG Min, WANG Wei, CHEN Xuewu, WAN Tao, SHANGGUAN Pengcheng

2009, 22(2): 274-279.

[Abstract](1713)

Abstract:
Models describing activity patterns of work commuting trips by workers were established based on activity-based travel demand analysis theory.Multinomial logistic method was adopted to analyze the effects of socio-demographics of individuals/households on their choices of four typical activity patte...

Bi-level Programming Model for Parking Assignment among Parking Lots in a Local Area

CHEN Qun, SHI Feng, YAO Jialin, YAN Kefei

2009, 22(2): 280-283,288.

[Abstract](2165)

Abstract:
A bi-level programming optimization model for parking assignment was derived to optimize distribution of vehicles among parking lots in a local area through management rather than random decisions by drivers.In the model,the objective is to minimize the total travel time of the drivers,including dri...

Optimization of Road Network Structure Based on Maximum-Flow Theory

XIANG Hongyan, ZHANG Lin, YANG Bo

2009, 22(2): 284-288.

[Abstract](2170)

Abstract:
Following the combination graph theory,a road network was described as a weighted discrete graph to analyze the structural equilibrium of the road network and recognize the critical links that cause non-equilibrium of the road network.A maximum-flow model was derived based on equilibrium of feasible...

Multi-objective Optimization of Stochastic Demand Inventory Routing Problem with Time Windows

LÜ, Xiongwei, LI Jun, LEI Ming, ZHANG Bin

2009, 22(2): 289-294.

[Abstract](2150)

Abstract:
An optimization model for multi-objective inventory and distribution strategies was established to solve the stochastic demand inventory routing problem with time windows(IRPTW).The model was solved with a multi-objective genetic algorithm(GA).The algorithm uses such genetic operators as best choice...

Prediction of 4D Trajectory Based on Basic Flight Models

WANG Chao, GUO Jiuxia, SHEN Zhipeng

2009, 22(2): 295-300.

[Abstract](2141)

Abstract:
To predict the trajectory of civil aircrafts efficiently and precisely,a new concept,basic flight models,was proposed.Horizontal trajectories,altitude profiles and speed profiles were built using the models depending on the flight phases.A whole 4D trajectory was obtained by combining the flight sta...

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2009 Vol. 22, No. 2