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July 30,2015
Volume 8,Issue 14
Pages -
Subject Area:Control and Navigation Technology of Aaerocraft,Highway Signs, Signals, Monitoring Project,Air Transport,Bridge and Culvert Engineering

Title: Suitability analysis on scene matching aided navigation based on CR-DSmT

Authors: LING Zhigang, QU Shengjie, HE Zhenjun, TANG Yu
PP: 1553-1566
Abstract: To deal with existing problems of matching suitability, this paper presents a scene matching suitability analysis method based on CR-DSmT, which fuses multiple metrics to provide the robust selection of suitable matching areas. Firstly, this paper analyzes and presents some improved suitability evaluation metrics, and then poses the suitability analysis on the reference image as a reasoning process with these multiple metrics, which puts the conflict and uncertainty into the DSmT framework. The experimental analysis results indicate the validity of this proposed method.
Keywords: guidance, navigcation and control; CR-DSmT; phase correlation length; effective contour density; multi-scale edge density; suitability analysis

Title: A vehicle detection algorithm based on corner detection and region growing method

Authors: ZHOU Bin, ZHANG Yun
PP: 1549-1552
Abstract: Intelligent transportation technology needs accurate detection of vehicles on road. Vehicle detection based on local features is becoming a focus of research. Therefore, a fast and robust algorithm is designed to detect the corners and region of the windshield by using either the continuity or discontinuity of the gray scale image. Experimental results show that the algorithm has a higher recognition rate in the detection of vehicle.
Keywords: highway signs, signals, monitoring project; vehicle detection; corner detection; region growing

Title: Research on the urban planning technology of transit oriented city

Authors: WANG Shuwei, SUN Lishan, ZHAO Pengfei
PP: 1543-1548
Abstract: In this paper, the urban planning technology of transit oriented city (TOC) was presented, aiming to build structured, rational articulated urban public transportation system, as well as proposing corresponding land use adjustment strategies for large cities. Firstly, we delineate transit station multi-level catchment area and establish a comprehensive public transport system consisting of transit as the backbone, long-distance bus as supplemented, regular bus, bicycle and walking as shuttle modes. Secondly, we adjust land use type and proportion within catchment areas so that residents can complete most of none-work travel within one area, thus reducing the average trip distance. Thirdly, we adjust land use type and proportion between catchment areas, achieving a reasonable passenger volume distribution among transit stations and reducing the possibility of overloading a partial transit line.
Keywords: transportation systems engineering; urban planning; public transportation; urban transit; mixed land use; land use difference

Title: Transit priority signal arterial coordination control in sudden-onset disaster

Authors: LIN Ciyun, GONG Bowen, QU Xin
PP: 1532-1542
Abstract: Aimed to evacuate the victim from disaster affected area safely, orderly, fastly, and to solve the difficulty to establish and maintain emergency vehicle lanes and transit-only lanes in sudden-onset disaster, this paper takes advantage of large capacity, high efficiency and low energy of transit system, and uses the transit system to evacuate the victim from disaster affected area by providing emergency signal or priority signal for transit based on passenger situation and transit status, proceeding transit emergency and priority signal arterial coordination control without emergency vehicle lanes and transit-only lanes in sudden-onset disaster. Firstly, vehicle signal priority level and priority strategy in evacuation route is analyzed. Then, transit arrival time estimation, queneing vehicle dissipation time estimation, traffic control signal status estimation, signal priority strategy optimization, arterial traffic signal offset optimization and online adjust as the kernel module are composed of transit emergency signal or prioprity signal arterial coordination control method. Finally, VC++ and Paramics API are used to develop simulation platform for testing the operation effect of transit emergency signal or priority signal arterial coordination control method. The results show that it can decrease travel time more than 13% and 6.0% and increase travel time stability more than 43% and 24% for transit signal emergency and transit signal priority separately under the saturation of traffic flow is greater than 0.8.
Keywords: transportation systems engineering; transit signal priority; arterial coordination control; emergency signal priority; sudden-onset disaster

Title: Research on solution scheme of flight conflict based on A* arithmetic

Authors: LIU Yongxin, YANG Yue, SONG Xiangbo, ZHAO Weijing
PP: 1524-1531
Abstract: A kind of heuristic arithmetic called A* arithmetic was studied in the field of flight conflict resolution strategy. Based on the analysis of conflict resolution strategy in China, a model of conflict resolution scheme was built in this paper. The cost function aimed at minimizing the working load of air traffic control (ATC) controller was designed, and the algorithmic framework was given. Results of simulation example showed that the method could reduce the searching space of controller’s instructions to a great extent, and optimize the controller’s strategy. Therefore, a scientific decision-making support has been proposed for the controller’s command.
Keywords: air transport; decision-making support; A* arithmetic; flight conflict detection; flight conflict resolution

Title: Rail expansion joint settings on long-span railway box hybrid girder cable-stayed bridge

Authors: ZHANG Ying, MA Kunquan
PP: 1516-1523
Abstract: Based on the principle of interaction between beam and rail and by taking a new long-span railway box hybrid girder cable-stayed bridge as the engineering background, the space finite element calculation model of tower-cable-beam-rail is established for researching the reasonable settings of rail expansion joint. Firstly, the model and related parameters are introduced. Then, the influence of rail expansion joint on additional longitudinal force and displacement is analyzed. Finally, we conclude that setting rail expansion joint at mid-span has little impact on additional longitudinal force. Setting rail expansion joint at one end of the bridge should not be considered in the practical engineering. Setting rail expansion joint at both ends of the bridge can effectively reduce rail additional longitudinal forces and the relative longitudinal displacement between rail and beam.
Keywords: railway transport; rail expansion joint; rail-bridge interaction; additional longitudinal force

Title: Optimal operation of direct train for enterprise-owned cars transport by national railroad

Authors: WANG Long，LIN Boliang，PENG Hui，LI Jian，CHEN Lei，WEN Xuhong
PP: 1509-1515
Abstract: According to the particularity of enterprise-owned cars transportation by national railroad, and on account of the traditional railcar blocking theory from loading area, we expand the modes for enterprise-owned cars direct transport by rail. On the basis of analyzing the possibility and rationality of operating direct trains for enterprise-owned cars as well as studying the cost parameters, we construct the optimal model for the enterprise-owned cars’ blocking plan. For the target of minimizing the total cost for operating enterprise-owned cars from loading area, and regarding of the uniqueness of single shipment’s blocking plan as constraint, the model can well solve the enterprise-owned cars blocking problem. Finally, in order to verify the rationality of the model, we give the solution for the Yanchang petroleum enterprise-owned cars transportation by rail.
Keywords: railway transport; enterprise-owned cars; loading area; railcar blocking; direct train

Title: Research of arrangement of fixed photovoltaic array on small tourist boat

Authors: SUN Zhongyu, TU Rong, HU Lifen
PP: 1503-1508
Abstract: According to the laws of solar radiation, theoretical calculation and statistical data, the total solar radiation was calculated. The main application of solar energy to ships is photovoltaic power generating system．It is necessary to research solar panels layout of the ship, considering the features of ships and water environment. The optimization results of fixing layout are gained by analyzing the calculation of solar radiation of photovoltaic array in different areas according to the characteristics of different fixing types of photovoltaic array. We conclude that photovoltaic array under the condition of invariable area, fixed layout in decorate level is better than that of oblique arrangement. In the pursuit of power under the premise of most inclined layout better than horizontal layout, where the best angle on a small tourist boat exists.
Keywords: shipping, ships and warships engineering; solar ship; photovoltaic array; layout; layout optimization

Title: Analysis of a screw crack problem in stabilizer bar based on ANSYS

Authors: LI Xiaoyu, HUANG Kang
PP: 1497-1502
Abstract: Aiming to solve the problem of the crack of a screw in stabilizer bar of one kind of automobile, finite element models of assembly composed of the screw end, nut and shim is established based on ANSYS. Two finite element models with circular shim and flat shim are built for the comparison to get the effects of the shim on screw crack. The static calculation results show that the use of circular shim will increase the stess of the screw while improve the pre-tightening force. Besides, the crack position is at the bottom of the thread part, different models are built according to the distributions of thread. The finite element static calculation of the screw based on the distribution of thread confirms the degree of the influences of screw thread distribution on crack, which leads to two new solutions which are put forward to improve the screw thread distribution.
Keywords: vehicle engineering; crack; screw; ANSYS; shim; thread

Title: Research on fault diagnosis method of automobile A/C and refrigeration system based on fuzzy fault tree analysis

Authors: HU Shuiying, ZHANG Qian, WANG Zhenyong, ZHANG Jiexin
PP: 1489-1496
Abstract: By analyzing the types of the automobile air conditioning system as the research object, the fault diagnosis method based on fuzzy fault tree theory is put forward through the analysis of the failure forms of the system. The fuzzy fault tree of the system is established and event fuzzy analysis as well as fuzzy algorithm is conducted for a rapid diagnosis of malfunction. This diagnosis method is intuitive, imageable, flexible, simple for the automotive air conditioning design, which offers a scientific basis for maintenance and repair and has a very high practical value.
Keywords: vehicle engineering; automobile A/C and refrigerating system; fuzzy fault tree analysis; fault diagnosis

Title: Modeling of vehicle yaw velocity control based on Stateflow

Authors: WANG Xianbin
PP: 1483-1488
Abstract: In order to fully study the logic execution process of yaw velocity control, vehicle yaw velocity control model is established based on the basic principle of the yaw velocity control. The Stateflow modeling simulation platform of Matlab/Simulink software is utilized. The modeling processes of the understeer control and oversteer control are explained in detail with the related parameters. Taking the oversteer control for example, the control simulation test is carried out and the detailed control process is analyzed. The simulation results verify the effectiveness of the control model, which can correctly simulate the control process.
Keywords: vehicle engineering; yaw velocity control; Stateflow; simulation analysis

Title: Mechanical properties research and parameter analysis on steel-UHPC composite bridge deck

Authors: GUO Rui, XIAO Rucheng, QU Bing
PP: 1476-1482
Abstract: Because of fatigue cracking in orthotropic steel bridge plates and damage of asphalt pavement, this paper presents an innovative concept of “steel-ultra-high performance concrete (UHPC) composite bridge deck system”. With an engineering project, we compare the composite bridge deck system to the original deck system. The results show that self-weight of composite bridge deck system is equal to the original plan, while the price reduced by 24% and the stiffness increased by 15%, and the steel component fatigue stress reduced by more than 40%. The composite bridge deck system has great application value. Relevant parameters analysis shows that thickness increase of the steel top deck achieve little promotion to mechanical properties. Strenthening the longitudinal stiffness can significantly improves the deck longitudinal stiffness and reduce hot-spot stress. Thickness increase of the UHPC-layer obviously improves the mechanical properties of bridge deck in both longitudinal and lateral direction, but it also increases the weight and cost of floor system.
Keywords: bridge and culvert engineering; steel-ultra-high performance concrete composite bridge deck system; orthotropic steel bridge plates; ultra-high performance concrete

Title: Experimental research on noise-reducing porous as phalt mixes with small aggregates

Authors: LUO Sang, LU Qing
PP: 1469-1475
Abstract: To design ultra-thin porous pavement, the permeability test, British pendulum test, dynamic friction test, acoustic absorption coefficient test, Cantabro test, rutting test, low-temperature bending test and freeze-thaw indirect tension test were conducted for 4.75 mm (OGFC4.75) and 13.2 (OGFC13) mm nominal maximum aggregate size gradation. Also, four types of porous asphalt mixesmade from two different asphalt binders were selected in this research. Test results show that the permeability, friction and anti-raveling performance of OGFC4.75 is either considerate or better than those with OGFC13, and has good permeable and noise-reduction performance. Epoxy asphalt binder is helpful for improving the pavement performance of open-graded asphalt mixes with small aggregates.
Keywords: road works; noise-reduction; dynamic friction tester; surface characteristics

Title: Causation analysis of urban road driving speed drift based on fault tree

Authors: DONG Yongjie, CHEN Yuren
PP: 1461-1468
Abstract: In order to discern the cause of driving speed drift in urban road, a hierarchical model of road visual environment is established to analyze the amount of information of visual environment. Accordingly, the fault tree model is set up where speed drift is regarded as the top event. Minimal cut sets and structure importance of the model are calculated, and factors that have greater impact on speed drift are studied qualitatively. Based on a case study of urban road, the cause of driving speed is computed quantitatively. As can be seen from the result, environmental information should be set reasonably according to structure importance of actual road facilities so as to keep driving speed close, design speed and maintain steady speed and reliable road environment.
Keywords: road works; speed drift; fault tree model; visual environment; structure importance

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