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March 30,2010
Volume 3,Issue 6
Pages 530-638
Subject Area:Basic Subject of Aviation,Control and Navigation Technology of Aaerocraft

Title: Design of SMS railway ticket system based on second ID card

Authors: YANG Jing, LIU Qi, SHI Feng
PP: 630～638
Abstract: Short message service (SMS) railway ticket system makes full use of resource of the railway ticket, combines wireless communications technology and banking business network with a variety of electronic currency for settlement, and finally takes advantage of machine readable authentication system based on second identity cards to get the tickets quickly, which realizes the booking wireless and automatic, the getting intelligent and voided. In this paper，we present the design concepts, overall framework, the railway market prospects and some of the key design technology of the ticket service system based on second ID card, and from the point of view of queuing theory to research and make sure the number of the smart ticket vending machine and the saving time in booking ticket.
Keywords: communication and transportation engineering; railway; short message service railway ticket system; second ID card; queuing theory

Title: Analysis of Chinese and foreign railway portals based on CRM theory

Authors: WANG Jia, LIU Yu, WANG Xiaoxia
PP: 623～629
Abstract: Based on customer relationship management (CRM) theory, the paper gives a sampling investigation and analysis of Chinese and foreign railway portals from the perspective of customers. The investigated items include four parts: the information provided by portals, the train schedule inquiries, booking systems and web links. The paper gathers the data of these four parts to do a statistical research. By comparing the results of domestic portals analysis with those abroad, the disadvantages of Chinese railway portals were found, including the redundancy of information, the incompletion of functions, the existence of false links and ads links, etc. To solve these problems, the paper gives some recommendations for website construction improvement, such as removing redundant links and false links, developing booking business, recycling customers’ feedback and setting up more service functions.
Keywords: railway transport; customer relationship management; railway; portal

Title: Application of BP neural network and curvilinear regression coupling algorithm in traffic forecast

Authors: FAN Jiadong, ZHANG Linggang
PP: 619～622
Abstract: For the limitations of the traditional algorithms that can not be reasonably used to predict the traffic, this paper adopted the BP neural network and curvilinear regression coupling algorithms to add the inadequate. First, BP neural network was used to train historical data and the curve regression was used to predict the various factors, and then the predicted values were substituted into the trained BP neural network which had been trained well, so the future traffic forecasts were got. By the example of Xuzhou Jiefang Road traffic forecast, and through error analysis, the results show that this algorithm has a higher accuracy.
Keywords: traffic forecast; curvilinear regression; BP neural network; curvilinear regression coupling algorithm； traffic

Title: Solution to a kind of transport optimization question based on Matlab

Authors: WANG Lijuan
PP: 614～618
Abstract: This paper analyzes how to transport one type goods to a station considering the limited transportation ability after researching a certain basic instance in the transport decision making issue, and establishes the optimization mathematical model taking limited transport time, loss degree of each batch of goods lower than upper limit and successfully carrying probability higher than prescriptive probability as constraint condition, and using optimization technology on the goal of the least supply depot and the lowest loss degree. The paper has compiled 0—1 integer programming function linprog 01.m using Matlab, and called non linear constrained optimization function fmincon in Mablab optimization toolbox to solve the model. It proves to be efficient by an example based on the Matlab and concludes the optimization transportation plan.
Keywords: integrated transportation; optimization; supply depot; successfully carrying probability; loss degree; Matlab

Title: Study on effect of bicycles on left turn vehicles saturation flow rate at intersection

Authors: YU Quan, GUO Yanming, RONG Jian
PP: 607～613
Abstract: In order to analyze the conflict of bicycles and left turn vehicles, this paper uses bicycles at signalized intersection as objective of research, through the study of the different states of bicycles crossing an intersection, this paper divides the conflicts of bicycles and vehicles into two cases to consider. In the first case, the conflicts of left turn vehicles and the bicycles which are initially released by green light are taken into consideration, the paper studies occupation rate of bicycles in conflict zone to analyze the effect of bicycles in this case. In the second case, the paper considers the conflicts of vehicles and free arrived bicycles, and uses theory of critical gap to analyze, finally it gets saturation flow reduction factor for left turn vehicles. The result of this study can supply the content about calculating method of vehicle capacity at intersection in Hard C Means2000 (HCM2000) and provide the basis for design of intersection signal timing program and calculation of capacity under the condition of mixed traffic at intersection.
Keywords: traffic engineering and management; signalized intersection; non vehicle collision; saturation flow rate; occupation rate; critical gap

Title: Evaluation of highway network in Poyang Lake ecological economic zone based on DEA method

Authors: SONG Huiying, ZHA Weixiong
PP: 602～606
Abstract: In order to study the relationship between the status of the highway network and the future demand, this paper evaluates the effectiveness of road network in Poyang Lake ecological economic zone. Through the establishment of evaluation index system of the highway network, using the C2R model of data envelopment analysis (DEA), makes comparison for the study area of the road network in each city, and then integrates all of the existing status of road network to analyze existing problems of non DEA efficient units and propose the improvements. The structure of the highway network is directly related to regional economic performance, and will have a greater impact on its development. Evaluation results show that the DEA evaluation method has feasibility and an obvious advantage.
Keywords: transportation planning and management; data envelopment analysis method; highway network; adaptability; evaluation

Title: The mechanism and construction technology of repairing the vehicle bumping by flip height

Authors: LI Qihong, YU Xiangjuan, BAI Jing
PP: 596～601
Abstract: The differential settlement of the structure at the connecting part between embankment and abutment results in the vehicle bumping, which impacts ride comfort, increases damage to vehicles, and leads to traffic safety problems when it s getting serious, at the same time it will greatly increase the cost of road maintenance. Setting flip height at the bridge head along with the construction and repair of highway will reduce the differential settlement, delay the vehicle bumping, and reduce the workload of the bridge s maintenance. From the mechanism of flip height, this paper analyzed the dynamic settlement monitoring of the highway, based on this, it set the flip height, and researched the matched construction technology.
Keywords: road engineering; vehicle bumping; mechanism; construction technology; flip height

Title: Parameter sensitivity analysis for overlay based on damaged old road

Authors: ZHANG Yanhong, WANG Xiaofan, SHEN Aiqin
PP: 590～595
Abstract: For reconstruction and extension projects, design of overlay for reinforcement section is one of the important contents. Based on the reconstruction and extension project of Beijing Tianjin Tangshan expressway, considering the damage condition of old road, using the large scale finite element analysis software ANSYS 10.0 and assuming the contact condition as continuity, pavement parameter sensitivity analysis was done for overlay structure with crack on. The results showed that when the overlay model with the old road cracked was used, in the condition of balance between technology and economy, increasing the thickness of overlay was good for the structure stress.
Keywords: road engineering; overlay; finite element; mechanical response; stress intensity factor

Title: Simulation on control strategy for regenerative brake system of a parallel hybrid bus

Authors: WANG Pengyu, ZHANG Qiming, ZHANG Jing
PP: 585～589
Abstract: Based on the characters of the parallel hybrid electric bus, a control strategy has been proposed, on the premise of the stability when braking. The control strategy includes the proper distribution between the friction brake force and the regenerative brake force, and the control of the regenerative brake force. According to the control strategy, the corresponding module in ADVISOR is modified, and the simulation is performed in ADVISOR. The result of simulation shows that the distribution and control strategy can enhance the recycled brake energy effectively, and improve the fuel consumption.
Keywords: electric vehicle; regenerative braking; control strategy; simulation

Title: The dynamic navigation based on the route choice

Authors: WANG Yili, MA Yongfeng
PP: 577～584
Abstract: With the rapid growth of the process of urbanization in China, issue such as urban traffic congestion is becoming more and more prominent and it has become the bottleneck in urban development. The traffic guidance for the route choice could relief the stress of traffic congestion. In order to change the situation of traffic congestion, combining with the current situation of the road induced measures and navigation systems, the paper researched the feasibility of the dynamic navigation system based on route choice. The paper also researched the choice of the best way to travel and some problems about the collection and processing of the dynamic data and gave some suggestions for these problems. The paper introduced a new method to solve the problem of traffic congestion in the urban, and it also indicated one direction for the dynamic navigation s and intelligent transport system(ITS) s development.
Keywords: highway transportation; dynamic navigation; review; induced travel; route choice

Title: Design of the self excited retarder drive controller and brake torque control method

Authors: YANG Xiaojun, HE Ren, SHEN Haijun
PP: 571～576
Abstract: This drive controller has successfully resolved the following problems for a self excited retarder: excitation coil uneven aging caused by unsynchronous work and rotor deformation induced by the uneven heating. The basic working principle of a self excited retarder was introduced briefly and the main circuits of its drive controller were designed in detail. Based on brake torque gear and vehicle s working condition, the formulae for calculating SCR s conductive angle were strictly derived and the real time control on brake torque has been realized successfully by controlling SCR s conductive angle.
Keywords: highway transportation; drive circuit; SCR s conductive angle; signal s detecting

Title: Framework of the emergency response system for water transportation of dangerous goods in China

Authors: YANG Jiangnan, LI Ke
PP: 567～570
Abstract: In this paper, based on China s currently actual situation of the waterway transport of dangerous goods, the general framework is built from these points of view: emergency management, early warning, emergency response and subsequent control, and the organizations of the emergency response system of the waterway transport of dangerous goods and their responsibilities are analyzed, finally the emergency treatment flow of the waterway transport of dangerous goods is proposed, which lay the foundation for establishing the perfect and unified emergency response system for China s water transportation of dangerous goods.
Keywords: water transportation; the emergency response system; general framework; organization; emergency treatment flow

Title: The effect of wheel lug type on tractive performance of wheel for lunar rover vehicle

Authors: SUN Peng, GAO Feng, YAO Shengzhuo, CUI Ying
PP: 558～566
Abstract: The numerical simulation of interaction between lunar rover vehicle s wheel and lunar soil simulant was conducted based on model of contact mechanics of lunar soil simulant s particle and irregular particle group system. The particle flow simulations represent the movement of soil under wheel and variational trend of drawbar pull by laboratorial soil bin test. The analytical results show the drawbar pull of wheel with negative obliquity s lug higher than the drawbar pull of wheel with positive obliquity s lug. Moreover, compared with straight lug wheel, the drawbar pull of wheel with skew lug decreases greatly. At the condition of lunar environment, the wheel with spiny lug loses tractive ability at lower slip ratio, and its tractive ability is limited at higher slip ratio. Therefore, such configuration of wheel couldn t be used as the wheel of lunar rover vehicle.
Keywords: vehicle engineering; lunar rover vehicle; tractive performance; wheel lug type; particle flow simulation

Title: Study on Williamson turn simulation of VLCC

Authors: LV Weiwei, HONG Biguang， BAI Jun, PEI Jingtao
PP: 554～557
Abstract: There are three methods to rescue the man on board,which are single turn,Williamson turn and Scharnow turn. The development of large sized ship makes these classic methods need to be improved, in order to faster and more conveniently rescue man on board, the article studies the ship Williamson turn of large scale impact. By establishing mathematical model of ships’ movement and using combination of the Matlab simulation and the navigation simulator, the paper studied very large crude carriers (VLCC) Williamson turn and obtained VLCC Willianson turn which was different from the classics Williamson turn that is earlier anti rudder and back rudder.
Keywords: navigation; very large crude carriers; simulation; turn

Title: Shafting design and alignment calculation of 72 m A.H./offshore support vessel

Authors: PENG Yunxia, ZHOU Ruiping
PP: 546～553
Abstract: Offshore support vessel is different from other vessels. For its special function and structure, the engine room arrangement, the choosing of the propulsion system and transmission equipment must be specially considered according to its self request. The paper shows the special design corresponding to the support vessel s concrete conditions, and the propulsive shafting is divided into two parts to transfer the torque: high speed shaft and low speed shaft. The rolling bearing is selected according to two parts of shaft; the diaphragm elastic coupling is selected to compensate the hull deflection. The alignment of the high speed shaft is done and the installation instruction is also available.
Keywords: shipping engineering; offshore support vessel; shaft design and arrangement; alignment and installation

Title: Computations of the propeller s open water performance based on periodic boundary condition

Authors: WANG Chao, HUANG Sheng, ZHOU Jian, HE Miao
PP: 541～545
Abstract: Computational fluid dynamics (CFD) software was used to calculate the open water performance of propeller in the viscous flow region and simulate the thrust and torque coefficient at different advance coefficients. The periodic boundary condition was used to simulate the viscous flow around the DTMB P4119 propeller. The influence of grid numbers on prediction of propeller s open water performance was analyzed. The pressure coefficient curves at different sections were obtained. Compared with the experimental results, the numerical results indicate the good agreement. It shows that the periodic boundary condition can be used to predict the open water performance of propeller rationally.
Keywords: fluid dynamics; propeller; open water performance; periodic boundary condition; pressure coefficient

Title: Large eddy simulation of the supersonic circular jet screech tones

Authors: GAO Junhui, LI Xiaodong
PP: 536～540
Abstract: In this paper, the full 3D supersonic circular jet screech tones at Mach number 1.190 and 1.372 are studied using large eddy simulation (LES) method. The Favre filterd Navier Stokes equations are utilized as the governing equations, which are closed with the standard Smagorinsky subgrid model. The 7 points dispersion relation preserving (DRP) scheme is applied for spatial discretization, and a 10th order spatial filter is utilized every step to filter out the spurious waves in the computation. The low dissipation and low dispersion Runge Kutta method in 2N storage form is used for time integration. Proper non reflective boundary conditions are used at different boundary regions. The program simulates the screech phenomenon correctly. The simulated screech frequency and amplitude are compared with the experimental data of PONTON et al and the unsteady Reynolds averaged navier Stokes (URANS) results of the present authors.
Keywords: aerospace propulsion theory and engineering; supersonic jet screech tones; computational aeroacoustics; large eddy simulation

Title: Program design on data access and display from micro AHRS of the MTi based on VC

Authors: HUANG Weiquan, MA Hanzeng
PP: 530～535
Abstract: The paper introduces composition and working principle of an attitude heading reference system (AHRS) MTi, explaines the raw data structure and the output format in detail, creates the human computer interaction, which can real time output and display the raw data of MTi, and displays the data of sensors which were separated from the raw data of MTi intuitively with performance graph by using the NTGraph control, where the graph can also be saved as requirement. As the hard core of the whole process designing, the paper specifically introduces the features and related use of MSComm control which is used for serial communication and the NTGraph control which is used for drawing, and finally shows the effect of the human computer interaction and performance graph of sensor data in the end.
Keywords: test measurement technology and instruments; human computer interaction; MTi; NTGraph control; MSComm control

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