bluuebunny/crossref_metadata_2025 huggingface dataset:
Research of the Low Temperature Crack Resistance for the Mineral Fiber Rein-Forced Asphalt Mixture
Authors: Zhao Li Hua , Xu Gang , Zhao Jing
Published: September 2011

This paper do the experiments of trabecular bending test and trabecular bending creep test on AC-16C asphalt mixture of adding two kinds of mineral fibers and non fiber within the temperature of 10°C,5°C and 20°C, analysis the influence of adding mineral fiber to the asphalt mixture on the low temperature crack performance.
Calculating Method and Safety Evaluation of Highway 3D Available Sight Distance
Authors: Zhang Chi , Yang Shao Wei , Zhang Min
Published: September 2011

Visual information is the basis of highway traffic safety, which is important for a driver to take right actions in driving. From the driving theory and the driver’s sight characteristics, the concept of available sight distance is put forward. According to extend and apply the theory of the spatial intervisibility between two spots, the math model of calculating and analyzing the spatial available sight distance is built up, which is solved by use of parameter equations and space conversion. On the basis of this model, the safety evaluation model and the evaluation procedures are given. At last, the effectiveness of the model is tested in practical engineering applications, and it can provide the basis for highway geometric design and safety evaluation.
Application Research on Uniform Design in Proportion of Compound Mineral Admixture
Authors: Li Yi , Wang Lian Jun , Yin Hua , Chen Ming Zhe
Published: September 2011

Using the uniform design method to design test of multi-compound mineral admixture and the secondary regression model to analysis the test results, we can obtain the optimum formulation of compound mineral admixture with steel slag powder, slag powder and fly ash. The results show that the uniform design method can significantly reduce the number of test and obtain the optimal formulation.
Research on Designing Optimum Asphalt Content of Asphalt Mixture by Calculation and Experimental Method
Authors: Liu Wen Fang , Li Hong Mei , Tian Bei Ping
Published: September 2011

In this paper, the initial asphalt content is estimated by the hot-mixed asphalt mixture rapid calculation method in condition that we have no information about the similar project, and five asphalt content are selected with regarding the estimated asphalt content as the middle value, then carries on the Marshall test. The optimuml asphalt content is very accurate by the calculation and experimental method, the method greatly improved the test efficiency.
Experimental Study on Asphalt Pavement Damage by Application of Acetate-Base Deicer
Authors: Xiao Qing Yi , Wang Hui Jing , Li Ning Li , Zhang Cai Li
Published: September 2011

Large amounts of deicing agents (abbr. Deicer) were applied on road pavements for snow and ice control each year in the cold region. The traditional deicers used on pavements resulted in metallic corrosion of vehicle and serious adverse environmental impacts. By contrast, acetates and formates were more environmentally friendly and more effective. After application of new deicers, heavy binder bleeding and severe stripping problems were observed occurring together with loss of asphalt pavement stability in northen Europe and northen America. Recently the large quantities of acetate-based deicers applied each year in China, damage by the deicers similar to that observed in those wereas would also occur in China. To shed light on neglected distress by deicer and guide the best practices of deicer application, asphalt mix design and maintenance of asphalt pavement, the paper revealed the asphalt mixture performance variation corroded by deicers and corrosion mechanism using immersion tension test, aqueous solutiion test and immersion penetration test.
Experimental Study on Fatigue Characteristics of Asphalt Concrete in Bridge Pavement
Authors: Li Yun Liang , Tan Yi Qiu
Published: September 2011

This paper demonstrates a type of SBS modified asphalt which added 8% TPS as the mixture for bridge pavement. Four types of asphalt mixtures were designed for composing four types of material forms. The fatigue characteristics of different types of combination of materials are studied by three-point fatigue tests of small beams. Equations of fatigue characteristics are obtained based on the experimental studies. Results show that antifatigue characteristics of SMA13+AC16 are better than others, while the sensitive degrees of fatigue life of four composite structures are generally the same to stress level.
Design Method for Highway Underground Trench Filter Layer in Loess Donga
Authors: Liu Li Ping
Published: September 2011

Filter layer is directly related to underground trench drainage, and the current design criterion for filter layer is relatively coarse, the classification of soil is not considered, filter layer thickness and the uniformity of filter material are not required, and so the current design criterion can not meet the needs of underground trench design of loess donga. Aimed at underground trench characteristic of loess donga, based on subgrade functional mode, this paper puts forward equivalent aggregate size , evenness control standards, the number of filter layers and thickness determination principle.
The Calculation of the Supporting Stress of Track Plate in Ballastless High-Speed Rail Structure
Authors: Wang Yang , Gong Quan Mei , Li Mei Fang
Published: September 2011

The slab track is a new sort of track structure, which has been widely used in high-speed rail and special line for passenger. However, the ballastless track structure design theory is still not perfect and can not meet the requirements of current high-speed rail and passenger line ballastless track. In this paper, composite beam method is used to calculate the deflection of the track plate and in this way the vertical supporting stress distribution of the track plate can be gotten which set a basis for the follow-up study of the dynamic stress distribution in the subgrade. Slab track plate’s bearing stress under moving load is analyzed through Matlab program. By calculation and analysis, it is found that the deflection of track plate and the rail in the double-point-supported finite beam model refers to the rate of spring coefficient of the fastener and the mortar.The supporting stress of the rail plate is inversely proportional to the supporting stress of the rail. The two boundary conditions of that model ,namely, setting the end of the model in the seams of the track plate or not , have little effect on the results. We can use the supporting stress of the track plates on state 1to get the distribution of the supporting stress in the track plate when bogies pass. Also, when the dynamic load magnification factor is 1.2, the track plate supporting stress of CRST I & CRST II-plate non-ballasted structure is around 40kPa.
Experiment and Research of Using Fiber Bragg Grating to Monitor the Dynamic Response of Asphalt Concrete
Authors: Li Ke , Xie Jian Guang
Published: September 2011

Based on the fiber Bragg grating sensing technology, a FBG sensor is designed to monitor the dynamic response of asphalt concrete; the sensitivity coefficient of FBG sensor is 1.28pm/με. Through the static load test, the correlation between strain and wavelength variation is 0.1797µε/pm, after second packaged and embedded in SMA-13 asphalt concrete. The instantaneous impact on the road of high-speed vehicles is simulated by using drop hammer. The results are shown that the Sensor can satisfy the requirements of practical applications and succeed in monitoring the dynamic response of asphalt concrete. The monitored signal can reflect the viscoelastic-plastic deformation law of asphalt concrete. The sensor can be used to monitor the dynamic response of asphalt concrete.
Analysis of the Mechanical Impact of High-Modulus Asphalt Concrete on Road Structure
Authors: Wang Xiu Shan , Chen Tuan Jie , Ding Xiao Jun
Published: September 2011

In order to study the rutting problem of asphalt pavement, this paper sets up a three-dimensional model of asphalt pavement with finite element. By analyzing the mechanical response of high-modulus asphalt concrete at different layers, this paper finds out the layer set of high-modulus asphalt concrete. At the same time, it further analyzes the influence of the modulus’ size and thickness of the high-modulus asphalt concrete on the load-carrying capability of road structure. The results show that high-modulus asphalt concrete can significantly restrain rutting problem and the recommend ideal modulus is between 2000MPa and 2500MPa; the ideal thickness ranges from 5cm to 7cm.
Road Macula Analysis and Evaluation
Authors: Sun Jian Cheng , Wang Lin Song
Published: September 2011

The subject Introduced the analysis method of the black-spot, established the black-spot discriminant model, And gave its algorithm. According to the characteristics of China's traffic flow, we develope black-spot database, so that the work of the black-spot identification can be quickly carried out。The Road black-spot traffic accidents describes the road sections which have significantly higher accident rate than the average level . Road black-spots identification, analysis and processing are widely considered to be the most efficient way to prevent traffic accidents. The identification of Road accident black-spots is the concern of road design, road safety review, operation management, and security studies , The research studies of road black-spot identification,and determines risk road sections, so that countermeasures can be put forward, and we can achieve the goals of design improvement, strengthen management, improvement of road safety operation environment, decrease of the number of traffic accidents and improvement of the whole road traffic safety performance.
Dynamic Response in ALF Aggregate Base Asphalt Pavement
Authors: Zhuang Chuan Yi , Shen Ai Qin , Wang Lin
Published: September 2011

In order to evaluate pavement dynamic responses accurately under truck loading, the full-scale asphalt pavement accelerated loading facility (ALF) was used. 10 strain gauges and 2 soil pressure cells were installed; temperature sensors were also installed in the different depth of the HMA layer. Pavement response was measured under real traffic load with ALF. The measured pavement responses are compared between the pavement sections to evaluate the effects of various experimental factors, such as axle load, speed, et al. Dynamic strain at the bottom of HMA layer and vertical compressive stress on the top of the subgrade were examined in the full-scale testing road, the regression models between dynamic response and axle load, dynamic response and speed were put forward respectively. Studies show that there is not only tensile strain but also compressive strain in the dynamic response, and the strain response is in the station of tension and compression alternation. Under the intermediate temperature, the strain response at the bottom of the asphalt layer is increased linearly with the increase of axle load and the vertical compressive stresses at the top of the subgrade is also increased with the increase of axle load. Speed has a great effect on strain response at the bottom of HMA layer, and has little effect on vertical compressive stress, it affects the loading duration of stress only. The destroy for the pavement by low speed and heavy load is more serious than that is normal.
Application Researches on Lasson Steel Sheet Pile Based on Foundation Pit Support Close to Railway Bridge
Authors: Hu Zhong Chun , Zhuang Kang Wu , Hu Feng Chun
Published: September 2011

As a lightweight, fast, airtight, flexible foundation pit supporting structure, lasson steel sheet pile has obvious advantages of short-cycle and low-cost during the construction of double track railway abutment. However, the influence of insertion and extraction of steel sheet pile to original lines is also very big. Therefore, timely backfill grouting, settlement displacement observation and propermaintenance are needed.
Study on Preventive Measures of Labor Injury of Crew on-Board Based on the Management
Authors: Zhang Xiao , Chen Ai Ling
Published: September 2011

According to “The Classification Criteria for Casualty Accidents of Enterprise Staff and Workers", the paper statistic and analyzed crew labor accidents occurred in a large state-owned shipping company in recent years, put forward on how to prevent the occurrence of such labor accidents from the angle of management，pointed out management measures preventing crew labor injury accidents occurred. And it included: seeing the crew labor safety as a systematic engineering, and carrying out security research on the systematic engineering according to security theory of it; setting up crew occupational health and safety management system and providing a healthy, hygienic and safe workplace for them; fully implement of the basic principle of safety at the process of production activity on board, attaching great importance to the five elements of crew labor safety; carrying risk identification on board about labor security, drawing up risk control measures about crew labor safety; instituting corresponding safety rules and regulations about crew labor for main operating activities on board; strengthening the safety education of crew working; establishing labor safety supervision organization, strengthening ship safety supervisor’s responsibility in term of crew labor safety; doing better for management of organization and supervision of on-scene work; carrying out human-based management on board; investigating and analyzing labor safety injury accidents that had occurred, drawing lessons from the accident to avoid similar incidents from happening again and so on.
Construction Features & Existing Problems of High Speed Railway Passenger Stations in China
Authors: Xia Sheng Li , Yang Hao
Published: September 2011

The paper firstly introduces development background and design concept of China’s railway passenger stations in the New Era. Then combined with construction & operation practice of some high speed railway passenger stations, construction characteristics and existing problems of China’s high speed railway passenger stations are analyzed. At last, some ideas for systematically solving these problems are put forward.
Research on Supply Chain Hybrid Competition and Channel Pervasion Effects in E-Commerce Age
Authors: Li Pei Qin
Published: September 2011

Supply chain hybrid competition happens among two manufacturers and one traditional retailer in e-commerce age. Being a channel leader the first manufacturer’s role becomes a little sophisticated. That is, being the traditional retailer’s supplier and competing with the traditional retailer’s on the internet at the same time. Besides, as an online competitor the second manufacturer’s channel status could go steadily up as electronic market becomes more mature institutionally. This paper compares two kinds of game models corresponding to two different channel statuses in supply chain partners, which means a weakest traditional retailer or a weakest online manufacturer separately. It finds two models’ existence conditions of supply chain partners’ optimal revenues, optimal decision variables, etc. By numerical analysis it especially analyzes their channel pervasion effects, at the same time, it gives some useful managerial inspiration further.
Application of Access Management at Urban Intersection Safety Improving
Authors: Ren Ying Wei , Wu Shou Rong , Wang Bo
Published: September 2011

Access management is an advanced traffic management technology. It can effectively improve safety of urban intersection, increase the capacity and enhance the level of service. This paper presents the concepts, principles and application of representative techniques of access management at urban intersection.
Evaluation Analysis and Optimization Design of Urban Road Traffic Condition Based on VISSIM
Authors: Qiu Xin , Zheng An Xia , Zhu Ying , Xu Bin
Published: September 2011

Based on the survey of the traffic flow characteristics in the intersection, combined with the traffic flow basic principle and the existing research results at home and abroad, the road congestion condition is evaluated by determining the microcosmic evaluation index coefficient by VISSIM microcosmic simulation software. Then, the reasonable measures are put forward to improve urban road congestion condition. The analysis shows that the residents’ trip efficiency is improved and the quality of the urban road traffic condition is ameliorated.
Analytical Solution of Congested Traffic Pattern Formation for a Viscous High-Order Model
Authors: Li Xing Li , Song Tao , Kuang Hua
Published: September 2011

In this paper, a new viscous vehicular flow model proposed by Song et al is discussed from the perspective of the capability to reproduce nonlinear traffic behavors observed in real traffic. The linear stability condition for stationary and equilibrium flow is derived. Near the neutral stability curve, the Korteweg–de Vries (KdV) equation describing congested traffic pattern is derived with use of the reduction perturbation method. And the corresponding analytical soliton solution is obtained.
Study on Integrated Land-Use of Rail Station Areas Based on Two-Way Balanced Passenger Flow
Authors: Liu Wu Sheng , Tan Qian
Published: September 2011

The implication and characteristics of integrated land-use of station areas were analyzed firstly. Then considering the current issue of unbalanced arriving and leaving passenger flow for a rail station caused by a single type land use in our country, a new way based on two-way balanced passenger flow to develop the rail station areas has been proposed and the related model has been constructed with a suggested solving algorithm. Finally, the model was checked and applied in Tashan Road station area development that is part of the planning project for line 5of Great Hexi, Changsha city.
Multi-Resolution Modeling of High Speed Railway Infrastructure for Train Operation Simulation
Authors: Jiang Xi , Ji Xue Sheng , Liu Jun
Published: September 2011

This paper analyzes the railway infrastructure simulation demands in train operation and organization at different levels. It takes the rail road network topology model and the railway signal system model as the core to build a multi-resolution-based simulation model architecture of the railway infrastructure. According to different information needs of railway infrastructure simulation model, it proposes a Hierarchical model achieving logic function of signaling system, and studies the signal system’s multi-resolution simulation methods through multi-level logic block configuration. According to the space information requirement of different simulation levels, the paper builds a multi-resolution rail road network mode.
Preferred Mode Choice Model for Commuter Purpose Based on Multinominal Logit Model
Authors: Han Yan , Guan Hong Zhi , Xue Meng
Published: September 2011

As a quasi-public traffic mode, more and more attention has been paid to the commuter bus to ease the traffic congestion. To get the travel behaviors of the commuters to which the commuter bus is available, The RP and SP survey about the travel behavior of commuters were carried out and the influencing factors of mode choice are discussed. The commuting mode combinations were found to exist during the decision-making process and there exist the preferred mode and secondary mode for each individual for one trip mode choice. The preferred mode choice model is established based on the multinomial logit mode. The results show that gender, month income, vehicle ownership, commuter cost, and commuter time have marked influences on the result of preferred mode choice for commuter purpose. The goodness of fit parameter ρ2 and goodness-of fit index adjusted by freedom ρ2 of the preferred mode choice model are 0.407 and 0.369 respectively, which implies that the forecast accuracy of the model is high. The VOT of the respondents in the survey is 29.9RMB/h and the results can provide a good reference for designing and optimizing of the commuter bus.
The Impacting Factors of Shopping Duration on Workdays in Ningbo, China
Authors: Shao Li Xia , Zhu Hui Bing , Jiang Hong Ping , Qiou Li Hui
Published: September 2011

Previous studies of the shopping duration have considered the impact of sociodemographic variables and temporal constraints. In this paper, we extend the those previous studies by seeking to establish how the duration of shopping episodes varies with the variation of commercial establishment environment, travel behavior surrounding the shopping episode, shopping with other activities and the number of shoppers together. The data used are 2856 residents’ shopping surveys in Ningbo of China on workdays in November 2009. The study applies cox regression models for examineing the effects of these variables on the duration of shopping episodes. The results indicate that the shopping duration is related to sociodemographic variables, temporal constraints, commercial establishment environment, travel behavior surrounding the shopping episode, shopping with other activities and the number of shoppers together. Shopping tends to take more time on workdays as the commercial establishment location is in the city central business area, the establishment business area is larger, distance from the previous to the current shopping location is longer, a person does shopping with other activities or a male person does shopping together with spouse. The effect varies, however, with the different periods of day and gender.
Generating Scenarios for Simulation Modeling of Container Ship Arrivals
Authors: Chen Jie , Lu Jing , Qi Shi Long
Published: September 2011

To provide effective strategies for the increasing traffic and future terminal development, in investigating ways in which terminals can improve the capacity and efficiency, this paper outlines a generic simulation model in scenario of experiments for a given terminal on the software of Witness, which can be adapted by some specific terminal. The aim of this model is to measure the terminal capacity and service quality in scenarios of changed inter arrival times and different arrival schedules. It is a tool for measuring and improving the efficiency of terminal with given ship arrival scenarios, which can provide a useful guide for terminal decision-makers and operators.
Drainage Performance Analysis of Pavement Structure with Permeable Base Course and Edge Drainage System
Authors: Cui Xin Zhuang , Liu Nai Ke , Cao Wei Dong , Ou Jin Qiu , Wang Cong , Zheng Xiao
Published: September 2011

In order to analyze the drainage performance of the pavement structure with permeable base course and edge drainage system, based on the theory of unsaturated seepage, the rainfall infiltration into the highway pavement is simulated numerically and the two-dimensional seepage analysis model is set up. The AASHTO evaluation index t50 is employed to evaluate the drainage performance. The results show that, in comparison with the pavement without internal drainage system, water can be drained away more rapidly from pavement structure with the permeable base course and edge drainage system and the volume water content in pavement is reduced effectively.
Research on Regional Logistics Spatial Evolution Based on Geographic Simulation System
Authors: Wang Wei , Feng Xue Jun
Published: September 2011

To explore development and evolution mechanism of regional logistics system, analyzed complex regional logistics system consists of certain types of entities such as logistics supply sides, logistics demand sides, the government and its professional management departments, it is mainly studied that the physical flow process between logistics supply side logistics demand side and the corresponding size, structure and layout evolution and optimization process between and within the regional logistics. Moreover, on the basis, combined with Multi-Agent System (MAS), Cellular Automata (CA), and Geographic Information System (GIS) technology to build geographic simulation system (GSS), then, build regional logistics space evolution model based on GSS, in addition, analyze the agents, environmental conditions and their agent behavioral strategies of the model in order to analyze the evolution mechanism of regional logistics system. At last, through empirical analysis demonstrates the model in this paper is reasonable and also can offer the reference to region logistics planning and operation.
Study on the Application of Internet of Things in the Logistics in Forest Industry
Authors: Zhao Chen , Li Xi Sheng , Chen Jun Song
Published: September 2011

The origin, the composition, the function, the application and the developing trend of the Internet of Things (IOT) were reviewed. The application of internet of things would greatly improve the information technology in logistics. The internet of things supported by RFID and sensor technology has been applied in the area of logistics. A framework of three technical systems of sensing, communication and network, and intelligence has been established. The present technology of internet of things in logistics of forest industry was analyzed. The application cases of the internet of things in timber storage, wood transportation and logistics of forestry biomass materials were shown with their system composition, management function and development.
Research on Modeling and Control Strategy of Electric Power Steering
Authors: Zhan Chang Shu , Xu Ning , Ma Zhen Jiang
Published: September 2011

This paper establishes the differential equation model and simulink simulation model of Electric Power Steering (EPS). After determining the structure of the control system, closed-loop control of given signal filtering and steering dish corner feedback signals was used respectively. The simulation shows that control strategy reduced the tracking error and the system dynamic response characteristics were good.
Topology Optimization of Sub-Frame Structure of 2500HP Fracturing Truck
Authors: Liu Jian , Pang Han , Wu Han Chuan , Xiao Wen Sheng
Published: September 2011

The sub-frame of 2500HP fracturing truck is an important component, which connects to chassis with the vehicle equipment. Because the sub-frame bears tension, torsion and bending loads, enough rigidity and intensity are necessary for chassis. Based on the Pro/E software, the 3-D model of frame and sub-frame was constructed. Using topology optimization method, layout of the sub-frame was determined and location of crossbeams was arranged. Meanwhile, number and location of the connectors between main frame and sub-frame was analyzed, analysis result shows that carrying capacity of chassis can be enhanced without increasing connectors number of main frame and sub-frame. Some available reference can be provided for chassis manufacture
Numerical Simulation of Effect of Nose Shape on Tunnel Entry/Exit Wave Induced by a High-Speed Train Passing through a Tunnel
Authors: Xu Jian Lin , Mei Yuan Gui , Yang Fan , Liu Xin
Published: September 2011

The air flow around the high-speed train passing through a tunnel is three dimensional, compressible and unsteady in nature. This paper carried out the numerical simulation of it and evaluated the effect of nose shapes of high-speed trains on tunnel entry/exit waves radiated directly from tunnel entrance or exit. The elliptical, parabolic and conical nose shapes were analyzed. A commercial CFD code STAR-CD based on the finite volume method was used applying the SIMPLE algorithm and a moving grid technology. The comparison study shows that though the patterns of tunnel entry waves or exit waves induced by high-speed trains with above three nose shapes are similar, the amplitudes of them are different. The wave amplitude of elliptical shape is the highest, and that of conical shape is the lowest, which implies that with the nose shape be more streamlined and slender, it might be more likely to reduce the amplitudes of tunnel entry/exit waves.
Research on Scheme of Power Conflux Planetary Train of Multi-Range Hydro-Mechanical Transmission System
Authors: Han Zhao Lin , Fang Yuan Yuan , Liu Feng , Zhao Jing
Published: September 2011

Hydro-Mechanical Transmission System has six basic schemes when the planetary train for power conflux connects to other mechanism with different ways. The paper divides the six basic schemes into two kinds of positive phase and negative phase according to the relationship of output speed and motor speed. If the positive phase planetary train and negative phase planetary train are combined to used as power conflux mechanism, Multi-Range Hydro-Mechanical Transmission System can be realized that has a wide range of infinitely spItalic texteed variable. The paper analyzes the kinematics characteristic and the reasonable value of parameters of planetary train of the eight combined schemes, when the output speed of all ranges follows arithmetic or geometric law. According to the results, the best combined scheme of planetary train for vehicle transmission is determined at last.
Control Methods of Active Front Wheel Steering for 4WD Electric Vehicle
Authors: Zhao Ming Hui , Wang Lian Dong , Ma Lei , Hou Hui
Published: September 2011

Based on two freedom degrees of vehicle model, control method which takes yaw rate and sideslip angle as system state, and front wheel corner and direct yaw moment as control input is put forward. Considering uncertainty of velocity and direct yaw moment, feedforward-feedback controllers are designed. Four wheel drive force are allocated by using feedforward compensation and yaw moment which is formed by driving force difference value. It makes yaw rate and sideslip well of tracking the desirable model when the vehicle drive steering. Finally, vehicle handling stability is studied on conditions of step input and sine input by simulation.
Research of Aerodynamic Characteristics about Minibus
Authors: Wang Jing Yu , Hu Xing Jun , Zhang Ying Chao , Yang Bo
Published: September 2011

To research the aerodynamic characteristics of minibus, the simplified model is studied with simulation and wind tunnel test. The validated method was adopted in the numerical simulation, the wind tunnel test were carried out in order to validate the results of numerical simulation. The tests include aerodynamic drag measure, filament method, and laser flow visualization. Through the contrasted research the results of simulation and test, the aerodynamic characteristics of minibus was analyzed and the characteristic of field around minibus was discovered. The conclusions provide the theoretical foundation for styling optimization of minibus, which are very helpful to develop new vehicle styling.
Function-Based Classification Method for Traffic Hub
Authors: Wang Xiao Rong , Rong Chao He
Published: September 2011

The efficiency of traffic hub will affect the efficiency of transportation network; furthermore, it will affect the efficiency of social economy. We must keep the scientific rationality of traffic hub system. The necessity of construct a complete traffic hub system is also pointed out in the paper. The author uses a traffic hub function matrix based on function to divide different traffic hub. Guangdong province is used as an example to explain the strong practicality of the method.
Research on Network Communication Model of Intelligent Ship Handling Simulator
Authors: Yang Shen Hua , Chen Guo Quan , Wang Xing Hua , Yang Yue Bin
Published: September 2011

Due to the target ship in the traditional ship handling simulator have not the ability to give way to other ships automatically to avoid collision, this paper put forward a new idea that bringing the hydraulic servo platform, six degrees of freedom ship mathematical model, the actual traffic flow, researching achievement of automatic anti-collision in research of the new pattern ship handling simulator, and successfully develop the Intelligent Ship Handling Simulator(ISHS for short). The paper focuse on the research on the network communication model of ISHS. We took the entire simulator system as three relatively independent networks, proposed a framework of communication network that combined IOCP model based on TCP with blocking model based on UDP, and gave the communication process and protocols of system. Test results indicate that this is an effective way to improve the ownship capacity of ship handling simulator and meet the need of multi-ownship configuration of desktop system of ship handling simulator.
Application of Grid Management to Traffic Risk Control in China's Coastal Waters
Authors: Zhang Jin Peng , Hu Shen Ping , Xi Yong Tao , Fang Quan Gen
Published: September 2011

Grid is one of the most important information technologies in recently years, and the theory of grid management has been applied in a variety of industries. Based on the advantages of grid management, it is applied to traffic risk management in coastal and harbor waters, and keys to implementation of grid management are discussed in detail. Finally, case study of Maritime Safety Administration (MSA) Fujian is illustrated, showing the grid-based management mode, mechanism, procedures, contents and measures. Thus, accident frequency in the area is reduced from 0.0741% of 2006 to 0.0485% of 2008.
Numerical Calculation of Added Mass for Ship Dynamic Stability by High Order Panel Method
Authors: Wang Hua Ming , Zhao Han Xing , Yang Yu Long , Rui Xiao Song
Published: September 2011

IMO Standards for ship maneuverability require prediction of ship’s maneuvering performance at the design stage. For this purpose, various methods such as those based on free running model tests, captive model tests or numerical simulation using mathematical models can be used. While this paper describes a numerical method for estimating ship’s dynamic stability by computing the linear sway and yaw added mass coefficients using a higher-order panel method based on Non-Uniform Rational B-Spline. Three dimensional forward-speed radiation problems are formulated and solved in frequency domain. The linear hydrodynamic coefficients are calculated and preliminary results are presented for a modified Wigley hull.
The Design of Transmission Scheme about 8-Speed AT Basing on Lever Method
Authors: Wen Qiang , You Ming Fu , Li Zhi Wei , Li Jiang Jiang
Published: September 2011

In this paper, a new transmission scheme basing on original lever method was expanded. The transmission and transmission scheme of ZF6 AT were detailedly analyzed by using the explanded Lever method. The studying results proved the correctness of the explanded Lever method, and a transmission scheme of 8-speed AT was designed and researched through it.
A City Intelligent Transportation Management Command System
Authors: Wang Yu Jin
Published: September 2011

With the rapid development of China’s urbanization, the traffic become much more heavy in the city, transportation management problem becomes increasingly serious and city intelligent transportation management command system (CITMCS) has become one of the urgent research and solving subjects of ITMS (intelligent transportation management system). This paper presents a city intelligent transportation management command system. It is an integrated intelligence system of the transportation detection, control, management, decision making, command and communication. It can control the transportation facilities conveniently, provides useful information for transportation user, and ensures travelers to go through the road conveniently and safely. The system will have an extensive prospect of application and development. The paper firstly introduces the concept of the CITMCS, then presents the basic composition and function structure diagram of CITMCS based on information processing and information share, and finally gives the analysis of the relative key technique in system construction process.
Analysis Model for the Continuity Evaluation of Guiding Information
Authors: Huang Min , Wu Hai Bin , Rao Ming Lei
Published: September 2011

To provide continuous guiding information is one of the basic functions in road guide sign system. The representation model of guiding information based on road network topology is presented first in this paper; the meaning of guiding path in guide sign system is introduced then; the analysis model for finding continuous guiding path and the assessment index for guiding continuity is constructed. As an example, the road guide sign system in Guangzhou Zhujiang New Town is analyzed by the present model. It shows that the analysis model is feasible.
Bus Scheduling Model for Adjustment Headway of Bus Carriers
Authors: Hafezi Mohammad Hesam , Ismail Amiruddin
Published: September 2011

Nowadays, the total volume of passenger trip demand has increased due to population and economic growth. In this situation , government policy encourages people to use public transportation for inter-city trips. In the meantime, buses are the most widely used in transit technology today. The most important issue in buses service is timely arrival. Due to the limited capacity of the streets and increasing car production, we cannot devote a specific lane to bus operation to separate their operation from other traffic. Generally, actual arrival time of buses in comparison to planned arrival time occurs in three scenarios : sooner, on-time, and later. This article represents different scheduling model to achieve timely arrival. For this purpose we tested two different scenarios by actual public bus operation. The data was obtained in the city of Tehran, since Iran was used in this study.
The Impact of Traffic Information on Drivers’ Day-to-Day Route Choice Behavior
Authors: Liu Shi Xu , Guan Hong Zhi
Published: September 2011

The influence of different traffic information on drivers’ day-to-day route choice behavior based on microscopic simulation is investigated. Firstly, it is assumed that drivers select routes in terms of drivers’ perceived travel time on routes. Consequently, the route choice model is developed. Then, updating the drivers’ perceived travel time on routes is modeled in three kinds of traffic information conditions respectively, which no information, releasing historical information and releasing predictive information. Finally, by setting a simple road network with two parallel paths, the drivers’ day-to-day route choice is simulated. The statistical characteristics of drivers’ behavior are computed. Considering user equilibrium as a yardstick, the effects of three kinds of traffic information are compared. The results show that the impacts of traffic information on drivers are related to the random level of driver’s route choice and reliance on the information. In addition, the road network cannot reach user equilibrium in three kinds of information. This research results can provide a useful reference for the application of traffic information system.
Method of Modeling the Excitation Spectrum of Train Based on Track Irregularity
Authors: Chen En Wei , Zhou Tie Ming , Liu Zheng Shi
Published: September 2011

A new technique is present in this paper that transforms the railway track irregularity power spectral density of left and right rails into the excitation power spectral density of wheelset of train, compared with the railway track irregularity spectrums of left and right rails which are not the direct inputs of simulation dynamic model of trail. A parameter model is chosen as the model of excitation spectrum and parameters fitting result shows that this model is suitable for the excitation spectrums of traversing, floating and head shaking, and the method present in this paper is effective.
A Multi-Objective Optimization Method for Coordinated Control
Authors: Gao Yun Feng , Hu Hua , Wang Tao , Yang Xiao Guang
Published: September 2011

In this paper, to overcome the limitations of the weighted combination and single objective optimization methods, we presented a multi-objective optimization and simulation methodology for network-wide traffic signal control. A multi-objective genetic algorithm based on Non-dominated Sorting Genetic Algorithm II was given to solve the model directly to obtain Pareto optimal solution set. The objectives were evaluated by Enhanced Cell Transmission Model used to describe traffic dynamics on signalized urban road network. The results showed that the single objective optimization method made some of the objectives worsen when the objective to be optimized reaching optimal, and that the weighted combination optimization method gained a compromised solution, but the multi-objective optimization method gave consideration to more objectives, making the number of optimal or suboptimal ones is more than that of worse ones.
A Traffic Accident Predictive Model Based on Neural Networks Algorithm and Rough Set Theory
Authors: Li Qiao Ru , Chen Liang , Cheng Chang Guang , Pan Yue Xiang
Published: September 2011

The most important and critical step to improve road traffic safety is prediction and identification of traffic accident black spot. A new prediction model of traffic accident black spots is proposed based on GA-BP neural network algorithm and rough set theory. First of all, the traffic accident statistics of Jinwei Road in Tianjin are analyzed. With consideration of static road conditions, the samples of road accident black spots are obtained by the GA-BP neural network algorithm. Furthermore, an effective road traffic accident black spot prediction model is established by utilizing rough set theory with consideration of the impact of real time dynamic conditions. Finally, a numerical example is illustrated. Experimental results show that the proposed model with the combination of these two theories can reduce the hybrid and burdensome amount of data, lower the false alarm rate and improve the forecasting accuracy of accident black spots.
The Design of Car Networking Based on WiMax and Zigbee Technology
Authors: Yuan Hong Wei , Song Qi Wen
Published: September 2011

The Car networking based on WiMax and Zigbee technology is mainly adopting WiMax network and Zigbee technology to build traffic information transmission system, using sensor carrying on the real-time data acquisition including the vehicle running and road condition data, with the chip storing date of vehicles or road, thus realizing the information communication between vehicles and vehicles, vehicle and roads, security control of vehicles. Test results show that the system can realize remote communication between vehicles and roads, traffic signs automatic identification, measuring the distance between vehicles and the safety control of vehicles in cases of emergency brake. Compared with traditional network, this network has its advantage with lower cost, easier to deploy and operating. This system is feasible in technique and reasonable in economy, suitable for security applications, such as collision warning, efficiency application, such as road tolling, commercial applications and information entertainment applications, has quite strong practicability.
Study on Performance of High-Performance Concrete Made with Fly Ash and Polypropylene Fiber
Authors: Zhang Lan Fang , Wang Rui Yan
Published: September 2011

High-performance concrete was made with fly ash and polypropylene fiber, the study shows that when fly ash content was 20% and polypropylene fiber was 0.6~1.2kg/m3, it had no significant influence on the workability of concrete, however the changes of 28d compressive strength and drying shrinkage of concrete are within 10%, but it can reduce brittle and improve toughness, and impact resistance of concrete is improved obviously, when polypropylene fiber content was 0.9kg/m3, it can improve over three times.
The Comprehensive Study about Fireproof and Single Insulation Walls for Cold Regions
Authors: Cao Wan Zhi , Wang Hong Zhen , Sun Qing Xia
Published: September 2011

To achieve national five climate partition 3 Step in building energy-saving target of 65% by a single product realization, it is to say that wall material realize the heat preservation. The iInsulation heat preservation problem , durability , fire prevention and frame beam-column parts with cold Bridges must be solve of wall materials products . This paper introduces the material composition, structure characteristics, product performance, technical and the engineering application supporting technology on non-bearing wall material of thermal insulation and durable fire integration —break hot energy-saving composite block. And the new wall materials about the development of a technical ideas are introduced at the same time.
Capture of Toluene Vapors Using Adsorption and Microwave Irradiation Regeneration
Authors: Cao Xiao Qiang , Liu Sheng Rong , Huang Xue Min
Published: September 2011

Experimental investigations using granular activated carbon (GAC) adsorption and then desorpted with microwave irradiation for toluene abatement are reported in this paper. The results indicated that the adsorption capacity of GAC for toluene was 198 mg (toluene) / g (GAC) at 303 K. Isotherm analysis of adsorption data obtained at 303 K showed that the adsorption pattern of toluene on GAC followed the Langmuir isotherm. The Langmuir constants Q0 and b were found to be 208.33 mg/g and 0.0023 m3/mg, respectively. At 313 K, the saturated GAC could achieve more than 90% regeneration efficiency in 40 minutes. In this investigation, the reasonable regeneration temperature and superficial gas velocity were 313 K and 0.073 m/s, respectively.
Study on the Seepage Law for Gas Storage in Bedded Salt Rock Caverns
Authors: Qi Peng , Mei Zhi Rong
Published: September 2011

Gas permeability mechanism for the laminated salt rock gas storage is very complex. The key problem is to establish the permeability model and to propose the corresponding numerical method suitable for salt rock with weak interlayer based on seepage theory in porous media. An efficient and accurate method is proposed to model the flow in fracture and matrix. The fractures are regarded as boundaries among adjacent matrix blocks. Darcy’s law governs velocities in the matrix blocks, while the flow in the fracture on boundaries is set up by accounting for the fracture’s thickness. This model can reflect the fracture flow which is different from the equivalent medium model, and its computational complexity is less than that of double porous model. Combining with the field situation of Jintan gas storage in China, the pressure distributions of storage with different cyclic pressures for gas injection and production in five years are studied. It is concluded that the effect of permeability on gas pressure distribution is very important.
Apply Fuzzy Factor Analysis in Aviation Ground Staff Occupational Stress Indicator Classify
Authors: Sun Kuo Shun , Hung Ching Tsung
Published: September 2011

The analysis for occupational stress of source has gathered great importance in recent year. Using traditional factor analysis to divide different preference was difficult. The data from questionnaire was vagueness and uncertainty. After using fuzzy factor analysis, the result of data can find new 12 factors in 61 attributes. There have more explanation to contain attributes then traditional factor analysis. Thus, fuzzy factor analysis can render classification of occupational stress indicator reasonable and acceptable than if the traditional method.
Theoretical Analysis and Research of Large Diameter Silos
Authors: Ma Rui Ting , Meng Yun Fang
Published: September 2011

In this paper, through analyzing the differential element of silos wall suffering from axially symmetric load according to their actual working status, the author applies the theory of taking account of moment to getting silos internal forces and displacements ,and gives the differences in the calculation results gotten respectively using nonmoment theory and the theory of taking account of moment through an example. What to be thought, during the course of designing to code for design of reinforced concrete silos, is brought.