西南交通大学学报

Dispatching Scheme for High Speed Passenger Lines in China

PENG Qiyuan, WEN Chao, LUO Jian

2006, 19(5): 541-548.

[Abstract](1433)

Abstract:
The factors influencing the selection of dispatching schemes were analyzed,and three dispatching schemes,namely the centralized scheme,regionally centralized scheme and access-based scheme,for high speed passenger lines to be built in China were proposed based on analyses of the dispatching schemes of the existing conventional railway lines and the Qinhuangdao-Shenyang passenger line in China,and the experiences of high speed railways in foreign countries.One from the three dispatching schemes was chosen as the dispatching scheme.The regionally centralized scheme is preferable to meet the developing and operational demands of high speed passenger lines in the near future.In this scheme,the dispatchers for the passenger lines work cooperatively with those for the existing lines in the same dispatcher’s offices of the corresponding railway bureaus.

Simulation Research on Carrying Capacity of High Speed Passenger Railway Line Stations

DU Wen, WEN Dong

2006, 19(5): 549-553.

[Abstract](1502)

Abstract:
The calculation methods for the carrying capacity of stations of existing railway lines are inapplicable to high speed passenger railway lines.To make the calculated capacity reflect the operations in stations of high speed passenger railway lines,a calculation procedure was proposed for simulation study on the carrying capacity of throats and arrival and departure tracks.

Comprehensive Route-Mode Sharing Model for Intersectional Passenger Traffic

LUO Xia, LI Degang, GAO Shilian

2006, 19(5): 554-559.

[Abstract](1487)

Abstract:
From the trip characteristics of intersectional traffic and the adaptability of transportation modes,the mode compartmentalization and the route assignment model of traditional intersectional traffic were analyzed.On the basis of analyzing the passengers’ profit of intersectional trip,the comprehensive "route-mode" disposal measure of intersectional passenger sharing rate was proposed,and a comprehensive "route-mode" sharing model was established to intersectional passenger transportation.The correlative parameter in this model,the time and expense evaluations of each transportation mode were analyzed and demarcated.This model can be adapted to the conditions that the discrepancy between the cost time difference for transportation modes in an OD zone and the cost time difference from each part in a city to its entrances is not very great (about 1 to 3 times) and sedans,as main trip vehicles,have popularized.Finally,the feasibility of the model has been validated by taking the Shanghai-Hangzhou area as an example.

Improvement to the Sequential Combination Tree Algorithm

WANG Ciguang

2006, 19(5): 560-566.

[Abstract](1371)

Abstract:
To increase the efficiency of sequential combination tree method,it is necessary to make full use of information in the constraint conditions.Based on a thorough analysis of the method,the concepts such as ultimate difference,necessary variables,and ineligible variables were proposed to combine constraints as a whole.A new algorithm was presented,in which the compatibility of constraints are determined and taken as a criterion to cut branches.It was proved that if all the necessary variables taking 1 is a feasible solution,it is the optimum solution.The flow chart of the new algorithm was presented.

Risk Intermediation by Distributors in a Supply Chain

YE Huaizhen, YI Haiyan, LIU Zhengchun

2006, 19(5): 567-570.

[Abstract](1290)

Abstract:
It was proved that a risk neutral distributor in a supply chain can intermediate the risk faced by retailers.To reduce the risk of retailers and increase the profit of the supply chain,the distributor offers a menu of mutually beneficial contracts to retailers.Each risk averse retailer can get a satisfactory contract from the menu and will raise the order quantity to get a maximum expected benefit,which in turn maximizes the distributor’s expected profit.

Research on Assignment of Passenger Train Plan for Dedicated Passenger Traffic Lines

ZENG Mingkai, HUANG Jian, PENG Qiyuan

2006, 19(5): 571-574.

[Abstract](2344)

Abstract:
Assignment,as the basis of passenger train plans,must be studied in order to make a reasonable passenger train plan.Main factors having an effect on assignment models were analyzed by considering passenger traveling demand and satisfaction.A train travel network was constructed based on traveling paths and stop stations of trains.By taking traveling psychology into account,passengers’ satisfaction was investigated according to their traveling time and cost.A multi-objective linear model for assignment,reflecting the passenger initiative to choose different trains,was established. Based on the investigation of main factors influencing assignment,the method of assignment was presented.

Mechanism and Calculation of Speed-Interval Control of High-Speed Passenger Trains

LIU Lan, WEI Deyong, YIN Yuan, WEI Fanghua

2006, 19(5): 575-581.

[Abstract](1544)

Abstract:
The parameters,such as braking ratio,braking distance,operation time and so on,and a formula for calculating minimum headways were presented.The signaling and operations of high-speed passenger trains depend on the braking stage design and relative equipment configuration to fulfill a complete braking process.The speed-interval control of high-speed trains adopts the one-step braking curve mode,and multi-step braking curve is as a standby mode.The key to reduce the headway on a line is to cut down the headways of arrival trains at stations in the same direction.For passenger trains at a speed of 250 km/h and over,the headway of 3 min can be realized with the one-step braking curve mode plus deceleration in advance.In the mixed operations of passenger and freight trains,the headway of 5 min can be realized when the braking ratio is 0.8,and the effective length of arrival and departure track and the throat length are no longer than 1200 m and 800 m,respectively,for a freight train at a speed of 120 km/h;and the headway of 4 min can also be achieved when the braking ratio is 0.6 for a high-speed passenger train at a speed of 200 km/h.

Method and Application of Traffic Impact Analysis for Logistics Implant

ZHANG Jin, ZHU Wei, HE Meiling

2006, 19(5): 582-588.

[Abstract](1504)

Abstract:
To make TIA (traffic impact analysis) of logistics implants (LI) efficient,a procedure was proposed by making full use of the research achievements.Logistics volume was taken as the criterion to evaluate the necessity of TIA.The concept and calculation method of traffic impact degree,instead of traffic service level,was used for TIA to express the influences of a LI on existing traffic.Measures to decrease traffic impact were proposed,including improvement of the traffic management at crossings,careful design of the entrances and exits of a LI, and clear layout of the signs and symbols of roads.

Development of Intelligent Flight Conflict Resolution System

MA Guozhong, MOU Qifeng

2006, 19(5): 589-593,613.

[Abstract](1399)

Abstract:
The flight conflict resolution problem was divided into 3 smaller sub-problems: co-altitude detection,minimum horizontal space detection and heading regulation,and the topological structure and procedure of the flight conflict resolution system were presented.The flight conflict resolution system was developed with VB.net and Matlab and by introducing the combinatorial optimization algorithms for general assignment problem and artificial neural network technique.Simulation results show that the system can provide flight management personnel with suggestions for short to long term plans of flight conflict resolution to raise the efficiency of flight management and ensure flight safety.

Client Grouping in Distribution System Optimization

LI Zongping, JIANG Sai

2006, 19(5): 594-598.

[Abstract](1543)

Abstract:
Client grouping based on distribution period was classified by taking the optimal distribution dates for individual clients as the criterion,and that based on distribution distance was classified by taking the closeness between clients as the criterion.To clarify the influence of client grouping on distribution schemes,a set of three simulated clients that evenly distribute in 50,100 and (200 m2) zones were studied.The two grouping schemes,which are based on distribution period and distance,respectively,and the total costs were determined.The results show that client grouping based on distribution period or that based on distribution distance is preferable when clients distribute densely or sparsely,respectively.

DEA/PCA Evaluation of the Structures of Logistics Industry

SHUAI Bin, DU Wen

2006, 19(5): 599-602.

[Abstract](1473)

Abstract:
DEA (data envelopment analysis) and PCA (primary component analysis) were combined to evaluate the structure of logistics industry in terms of relative efficiency of input and output,and a model was presented.In this model,DEA and PCA are used respectively to evaluate and sort the structure of logistics industry,and the results are analyzed intuitively in a coordinate composed of DEA and PCA results.This method can also be used annually to get continuous analysis results.

Method for Pricing of High Speed Passenger Lines in Consideration of Share and Competition in a Railway Transportation Channel

MA Si, LI Xin

2006, 19(5): 603-607.

[Abstract](1539)

Abstract:
The share of a railway transportation channel and competition in medium and long distance passenger traffic market were analyzed.A multilevel programming model for pricing of high speed passenger lines with different classes of trains was proposed.In this mode,the requirement of passengers to choose a train based on minimum generalized cost,maximum benefits for transportation enterprises and share of the railway channel by the existing lines were considered as the optimization objectives to get the best or the almost best methods of pricing.The model was solved with a genetic algorithm.

Management of Railway Container Transportation in Railway Terminals

LI Yinghong, YAN Haifeng, PENG Qiyuan

2006, 19(5): 608-613.

[Abstract](1597)

Abstract:
The transit operation of containers in junction railway stations was analyzed.Three schemes for container transport within a railway terminal were proposed.In scheme Ⅰ,containers are fed into a junction railway stations in ordinary container trains.In scheme Ⅱ,container trains are remade-up after hauled into a junction station in pickup and drop trains,and the remade-up trains are delivered to a marshalling station in transfer trains.In scheme Ⅲ,container trains are remade-up after hauled into a marshalling station in pickup and drop trains,and then the remade-up trains are delivered in transfer trains to a junction station.A model was proposed to compare the transportation costs of the three schemes.The result shows that scheme Ⅰ costs the least,and is the most efficient.But it is difficult for it to be implemented practically in the near future in China.Alternatively,scheme Ⅱ and Ⅲ are suggested as transitional schemes at initial stages of development of container junction stations,and scheme Ⅰ as a candidate for future application.

Robust Optimization-Based Integrated Logistics Network Design for Hybrid Manufacturing/Remanufacturing Systems

MA Zujun, DAI Ying

2006, 19(5): 614-619.

[Abstract](1619)

Abstract:
To design an appropriate integrated logistics network structure for a hybrid manufacturing/remanufacturing system,a robust optimization model was established by considering the integration of facilities and the transportation of forward and reverse logistics in the network as well as the uncertainty of the demand for new and remanufactured products,the returnable quantities and the remanu-facturable fraction of used products.As a result,the number of various facilities,their locations and the reasonable allocation of the corresponding goods flows within the network can be determined.The case results show that the optimal design of an integrated logistics network for hybrid manufacturing/remanufacturing systems under uncertainty can be solved effectively with this model.

Accumulation Process of Block Container Trains in Railway Junctions

YAN Haifeng

2006, 19(5): 620-625.

[Abstract](1531)

Abstract:
To calculate the accumulation cost of a BCT (block container train),the theory of stochastic process was used to study the number containers of a BCT,as well as the number of arrival containers and arrival intervals in accumulation processes.Parameter estimation for arriving intensity was discussed.It was found that whether containers are loaded or empty has little effect on the number of BCT; the arrival of containers can be described as a simple counting process,and the arrival interval follows the Poisson distribution.Therefore,the accumulation process of a BCT can be described as a typical mark value counting process.The average accumulation cost is positively proportional to the number of container in a BCT and the sum of arrival containers in the period of time concerned,and linearly correlated to the expectation value of the number of arrival containers.

Research on Operation of Sunset-Departure and Sunrise-Arrival Trains on Dedicated Passenger Lines

PENG Qiyuan, LUO Jian

2006, 19(5): 626-629,640.

[Abstract](1638)

Abstract:
The cooperative optimization of comprehensive skylight and operation of sunsetdeparture and sunrise-arrival trains on dedicated passenger lines,the organizational forms and the operation conditions of sunset-departure and sunrise-arrival trains were investigated using the system method,and the modes of operating in-line and off-line sunset-departure and sunrise-arrival trains were analyzed.The range of operation distance under the comprehensive skylight time of 3, 4 and 5 h was respectively calculated,and the operation conditions of in-line and off-line sunset-departure and sunrise-arrival trains were obtained.

Application of Vehicle Driving Simulators in Traffic Engineering

TANG Zhihui, ZUO Tingliang, ZHOU Meiyu

2006, 19(5): 630-634.

[Abstract](1588)

Abstract:
A vehicle driving simulator was presented,which is composed of a real-time control and simulation computer system,a graphic simulation system,a sound simulation system,a motion simulation system and a control board.Three simulation models,namely,dynamics model of vehicles,road network model and traffic simulation model,are used in the simulator.An example was presented to show the application of the simulator in research of traffic engineering,in which a car on a small road is waiting at a intersection for an acceptable gap between the vehicles running on the main road to left-turn onto the main road.

Computer Scheduling of Motor Train-sets for High Speed Passenger Railways

ZHANG Jie, CHEN Tao, SHI Fugen

2006, 19(5): 635-640.

[Abstract](1599)

Abstract:
An integer programming model was presented based on the rules of motor train-set operation.To reduce the complexity,the motor train-set scheduling problem was divided into two sub-problems: making sub-routings and then building routings based on the sub-routings.A multi-start search algorithm and path-exchange strategy were designed to optimize the routings in terms of effectiveness and balance.An example was presented to show the feasibility of the proposed model and algorithm.

Method for Urban Bus Lane Network Planning

ZHANG Nan, LI Xiangyong

2006, 19(5): 641-644.

[Abstract](1496)

Abstract:
The urban bus lane network planning was studied using urban rail transit network planning method to alleviate traffic jams,improve public traffic services,and design efficient traffic structures.Based on the feasibility and necessity analyses of lanes,the speed standard,flow rate standard,and road condition standard were determined.A method was proposed for planning the demand network and feasible network of bus lanes,and the final bus lane network is formed by overlapping the two networks.In this method,the forecasted data of bus flow is obtained using traffic forecast,and the planned network should be conform with the whole network planning of a city to form a efficient traffic network.

Improvement of Road Network Reliability Based on Critical Links

LIU Haixu, PU Yun

2006, 19(5): 645-648.

[Abstract](1592)

Abstract:
To simplify the problem of improving road network reliability with limited resources,only critical links,which are chosen by travelers with higher probabilities than a prescribed threshold,were selected.Because stochastic user equilibrium with elastic demand is used to characterize the travelers’ route choice behaviors before and after incidents (e.g.,earthquakes,floods,hurricanes,etc.),the link choice probabilities can be computed in an efficient link-based manner,and the critical links can be easily determined.A mathematical model was presented,in which the highest reliability corresponding to net economic benefit was taken as the objective for the road network subject to a resource constraint.A heuristic algorithm for the model was designed.The results of a numerical example were presented to show the effectiveness of the proposed method.

DEA Model for Logistics Activity Cost Control of Enterprises

SUN Chaoyuan, PENG Qiyuan, CHEN Xu

2006, 19(5): 649-652.

[Abstract](1534)

Abstract:
To solve the problem that the activity based costing method has bad operability in logistics activity cost control of enterprises,a DEA (data envelopment analysis) model was presented.The mechanism of the model is to take a logistics activity as a decision making unit to evaluate the efficiency of input and output.Based on the DEA results,the high efficient logistics activities are reserved,and the low efficient ones are improved with explicit goals and methods.The key procedures applying the DEA model include establishing a standard logistics activity database,decomposing logistics activities and determining the logistics efficiencies of the decision units.

Model and Algorithm for Making Locomotive Working Diagram Based on Multiple Traveling Salesmen Problem

TAO Ran, LÜ, Hongxia, CHEN Guangxiu

2006, 19(5): 653-657.

[Abstract](1604)

Abstract:
To improve the working efficiency of locomotives,model and algorithm for making locomotive working diagrams were investigated.To a given train diagram,a new algorithm for making a locomotive working diagram with the minimum number of locomotives used and the equilibrium of time was proposed.A locomotive working diagram was transformed to a multiple traveling salesmen problem,and its mathematical model was set up to gain the optimum solution.Actual train diagram data have proven that this algorithm is useful to obtain the optimal equilibrium of a locomotive working diagram with a minimum locomotive number.

Improved Multi-objective GA for MRT Train Operation Simulation Model

SHI Hongguo, PENG Qiyuan, GUO Hanying

2006, 19(5): 658-662.

[Abstract](1720)

Abstract:
In order to solve an MRT (mass rapid transportation) train operation simulation model and obtain the optimum operation curve,an improved multi-objective GA (genetic algorithm) was proposed.In this improved GA,gene encoding is based on train control shift position,and a chromosome composed of genes represents a train operation plan to produce the original population.The fitness function includes the objectives of train control,such as stop deviation,time deviation and energy consumption.Every individual is checked with some rule before accepted as new population in course of selection,crossover and mutation,and each algorithm contains elitist reservation in the improved GA.In addition,the proposed GA was tested through a comparison with the multi-particle model by using a case. The result shows that the improved GA can save energy above 10% and give many alternative train control schemes.

Sensitivity Analysis of Traffic Impact of Large Buildings on Traffic of Road Network

REN Qiliang, PENG Qiyuan

2006, 19(5): 663-668.

[Abstract](1498)

Abstract:
Large buildings were classified according to their functions.A sensitivity analysis index system for traffic impact of large building on traffic of road networks was established using analytic hierarchy process,and the models for calculating the indices were derived based on the principles of traffic engineering and system engineering.The uncertain factors in the main sensitivity analysis indices of traffic impact were determined.The traffic impacts before and after changes in uncertainty factors were correlated.The method for sensitivity analysis of traffic impact on large buildings on traffic of road network was proposed.and gave The Nan’an Sports Center in Chongqing was taken as an example,and the results show that the variation rate is the main sensitivity index.

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2006 Vol. 19, No. 5