bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on the Integration Plan of Weihai’s Urban and Suburban Bus System Based on the Operational Efficiency Analysis
Authors: Liu Bing , He Ji Ping , Wang Zhi Wei
Published: September 2011

At present, the fragmented development of urban and suburban bus system is facing many problems and difficult to adapt to the requirements of urban-rural integration in China. In this paper, the urban and suburban bus route network and passenger volume distribution characteristics were analyzed, the operational efficiency of the two system was compared based on the case study of Weihai; the principal factors that influence the operational efficiency were further studied; and finally, the integration plan of urban-suburban bus system as well as the suggestions on its implementation were proposed.
Evaluation and Optimization on Colors in Urban Traffic Based on PSO and GT-BPANN
Authors: Yuan Hong Wei , Zhang Wen Bo
Published: September 2011

In order to reduce traffic accidents, achieving safety and harmony of traffic color, a quantitative research on traffic color of urban road were carried. Grounded on modern knowledge of color theory, color psychology, Grey Theory and Back-error Propagation Artificial Neural Network (GT-BPNN), Particle Swarm Optimization algorithm (PSO) and traffic questionnaires, the evaluation index system of traffic color in urban road, the evaluation model of transportation color and the model of color harmony and optimization in urban road were constructed. Assisted by MATLAB and other software, the reliability and validity of models were determined, taking a road in Xuzhou, Jiangsu as a test section. According to the results, some reasonable improvements on traffic safe color were recommended.
Urban Transport Database Design in China
Authors: Wu Hong Yang
Published: September 2011

Urban transport database (UTD) is one of the most important bases for academic research and management in transport sector. In this paper, comparison analysis between international and domestic urban transport database was implemented. Based on the Chinese practices, the objectives, framework and key technologies of the Urban Transport Database were presented. The upload and download mechanism of the urban transport data was presented as well. It will provide an efficient technical support for UTD construction in China.
Measuring Passenger’s Perceptions of Taxi Service Quality with Weighted SERVPERF
Authors: Yao Zhi Gang , Ding Xiao Dong
Published: September 2011

To know passenger’s real needs of taxi service quality, operator and regulator are seeking a proper method that can represent passengers’ opinions accurately. In this paper, a weighted SERVPERF model was expressed to assess taxi service quality of Hangzhou, China. All 22 items were divided into five dimensions including tangibles, assurance, reliability, responsiveness, and empathy. Importance and performance of five dimensions were calculated. Authors found that assurance had the highest point and responsiveness had the lowest point in performance appraisal, reliability had the highest point and empathy had the lowest point in importance appraisal. Passenger’s characteristics are unrelated with service quality appraisal indicate that there are not personalized needs for taxi service.
The Timing of Urban Rail Transit Construction Based on the Weighted Gray Correlation
Authors: Luo Xiao Qiang , Guo Yan Yong , Wu Yao
Published: September 2011

In order to clear rail lines of the construction of the timing, the need for each line analysis and evaluation of scientific and rational manner, thus forming a good construction planning program. Analysis of the impact of rail transit construction timing factors, and presented its quantitative methods; further established based on the weighted gray correlation of urban rail transit construction methods and sequence the steps to solve the model. Finally, an example of Xi'an rail transit network in the timing of the construction. The results show that the proposed method using the results of the same order with the actual construction, the method is simple and has good application prospects.
Interactive Relations between Urban Arterial Transit Route and Land-Use under TOD Mode
Authors: Xie Bing Lei , Ding Chuan , Wang Yao Wu
Published: September 2011

To study interactive relations between urban arterial transit route and land-use under TOD mode, the features of urban arterial transit route and its surrounding land-use were analyzed. An interactive relation model between urban arterial transit route and land-use was established with nonlinear differential equations. Dynamic evolvement and trends of urban arterial transit route and land-use were analyzed, and stability and conditions on equilibrium states were shown by differential equation stability theory. A simulation was done to show that the development of arterial transit route in urban had a trend to surpass traffic capacity of equilibrium state.
Study on the Application of Plant-Mixed Hot-Regenerated AC in the Maintenance of Expressway
Authors: Zhang Xi Ying , Sun Dong Yu , Lai Bing
Published: September 2011

Highway, especially expressway plays a very important role in economic development of today. To deal with the traffic load, the surface of expressway should have the nature of strength, load-bearing ability, skid-resistance, free of penetration and duration. AC is one of the high type pavements. With the rapid development of highway, most of the AC pavement will be destroyed by heavy traffic loads, and should be maintained with millions of waste materials produced. Plant-mixed hot-regenerated AC is to recycle these waste materials, and apply part of them as one of the ingredients of the new AC of the new pavement. Method of mix design of the Plant-mixed hot-regenerated AC is discussed is this article. The method was applied in the maintenance of the Chang-Ying expressway and has obtained relatively obvious economic effect and social effect.
Experimental Study on Stresses Distribution under Embankment
Authors: Xiao Hong Bing , Jiang Guan Lu
Published: September 2011

For high-speed railway subgrade settlement, there was usually a big difference between calculated and measured value. Studying the stresses distribution under embankment, giving more accurate simplified method，was a approach to improve the accuracy of calculated settlement. The stresses distribution under embankment were studied through tests on experimental embankment segment, geotechnical centrifuge model tests, and numerical analysis and calculation. Studies showed that the measured stresses distribution was curve, the stresses under the embankment centre were highest, under the vicinity of shoulder the stresses changed smoothly, the stresses was above zero at toe of the side slope.
The Analysis of Temperature and Displacement Coupling in Freeze-Thaw Process of Soil
Authors: Hou Shu Guang
Published: September 2011

Through the coupling analysis of temperature and displacement fields in freeze-thaw process of soil by ABAQUS software, a numerical simulation method of the two fields coupling in freeze-thaw process of soil is put forward. In computation, the temperature field is analyzed firstly, and then the physico-mechanical parameters are defined as functions of temperature field. The geometric model and boundary conditions of numerical simulation are identical with these in laboratorial tests. By comparing the computation results of soil freeze-thaw process with its laboratorial test results, it was found that on the curve of soil freeze-thaw process obtained from laboratorial tests there is a short frost-swelling phenomenon at the initial stage of freeze-thaw process, and then is continuous thaw condition, but on the numerical computation curve, the reflect of soil frost swelling stage isn’t obvious. With the exception of this the numerical computation result and laboratorial test result are more identical. The frost-swelling quantum is very small, so the main expression of overall deformation of soil is thaw-settlement deformation. Therefore the frost swelling phenomenon doesn’t influence the end quantum of settlement. For this reason, the computing method introduced in this paper can be used to conduct numerical simulation of the thaw-settlement of frozen soil and to a certain extent guide the designs of subgrade and pavement in permafrost zones.
Coupled Dynamic Analysis and Verification of Vehicle-Road System
Authors: Luo Hong , Liang Bo
Published: September 2011

While a vehicle running on the road, the vibration of vehicle and road are coupled and interacted. The vehicle in this paper is simplified into a two DOF vibration system and the road is dispersed as a multi-layer FEM system. Then considering the road and vehicle as a whole system, and each of them is a subsystem, we created the coupled dynamic analysis of vertical vehicle-road system and derived the dynamic equilibrium equation of vehicle-road system. We deduced the dynamic equilibrium equation of vehicle-road system by regarding the pavement roughness as a stimulate function, which is want to do some pioneering study in a coupled view about the interaction of vehicle and road.
Effects of Hydrated Lime on Consistency Properties of Asphalt Binders
Authors: Mwanza Aaron D. , Hao Pei Wen , Wang Hai Nian
Published: September 2011

Although the addition of hydrated lime to mineral aggregates at asphalt production plants has become mandatory for use in all asphalt concrete mixtures, the consequences of such additives at asphalt binder- mineral aggregate contact in the hot bin have shown a great effect on the consistency properties of the resulting asphalt mastics as compared to that of a neat asphalt binder. Considering that many highway agencies in developing countries still use asphalt binders consistency properties to verify material specifications for acceptance and construction practices control to build sustainable highways, it is eminent that asphalt mastic other than neat asphalt binder should provide pertinent information for consistency characterization of the neat asphalt binder in question. Fundamental consistency properties of asphalt binder containing hydrated lime to a conventional No. 70 asphalt binder (Penetration Grade) designed to meet the JTG F40-2004 specification of China were investigated. Hydrated lime was dry mixed with neat asphalt binder at hydrated lime to binder ratio’s ranging from 0.0 to 1.5 in ratio increments of 0.3% by weight of asphalt. Analyses of test results show that asphalt mastic consistency properties are well-defined linear functions of hydrated lime content. Penetration and ductility shows a linear reduction at increased hydrated lime content estimated at 14 (0.1mm) and 15cm per 0.1% of hydrated lime increment respectively while softening point and apparent viscosity increases at the rate of 6oC and 0.1 centipoises per 0.1% of hydrated lime increment respectively.
Numerical Simulation of the Process of Partial Void Formation under Cement Concrete Pavement Slab
Authors: Zhang Xiao Chun , Liu Shu Shu , Hu Shi Kui , Zhang Ning
Published: September 2011

The damage of void under cement concrete slab is one of the main diseases in cement concrete pavement. By finite element method, a 3-D model of cement concrete pavement structure was established to simulate the partial void under the cement concrete pavement slab with different loading conditions. The process of the division between the subgrade and the slab with a soft area under the slab are reappeared. The changing rules of the void size with the number of cycle load in case of different tie pressure and loading location (at the center, edge or corner of the slab).
Research on the Efflux Angle to Emergency Escape Ramp of Mountain Roads
Authors: Pan Bing Hong , Liang Rui Juan
Published: September 2011

To resolve heavy-duty trucks side over the boxes, scraping the guardrail and other accidents when driving into the entrance of emergency escape ramp, according to studying on lateral stability of the out-of-control heavy-duty trucks and combining with their mechanical properties, this dissertation analyses the wheelpath’s geometric features when the out-of-control heavy-duty trucks rush into the emergency escape ramp from the main road, results a reasonable range to adapt the efflux angle of emergency escape ramp on our mountain expressways, and provides necessary theoretical references for the selection of the efflux angle on mountain roads.
Ballast Flying DEM Microscopic Analysis and Counteracting Measures
Authors: Jing Guo Qing , Gao Liang , Sun Xiao Lin
Published: September 2011

Ballast flying problems obsess the high speed railway developments, causing damages to the train and deteriorations to the rail. In the paper, DEM is used to conduct ballast flying mechanism microscopic study, results show ballast flying increases with train dynamic force, and decreases with ballast size and friction coefficient, ballast flying counteracting measures are presented, such as ballast bed parameter and ballast glue. In the end, future possible microscopic ballast flying model method is presented by DEM coupled with CFD.
Study on the Axle Load Conversion Formula for Asphalt Pavement Based on Actually Measured Deflection Equivalent
Authors: Sun Ji Shu , Xiao Tian , Yang Chun Feng , Sun Jian Cheng
Published: September 2011

Vehicle load is one of the most important factors influencing service performance and service life of pavement. In the pavement design and analysis, different axle loads need be conversed to the standard axle load based on the equivalent deterioration principle of pavement. Pavement surface deflection values under different axle loads have been measured on several expressways in this paper. The correlation relationships between deflection and axle loads are analyzed. The regularity of deflection and axle conversion index based on deflection equivalent are analyzed, too. The axle conversion formula based on deflection equivalent for asphalt pavement is regressed according to the actually measured deflection data. This research achievement can provide us with a reliable axle load conversion method for asphalt pavement design.
Contrastive Studies of Asphalt Pavement on Suction Exothermic Properties and Cooling Measures
Authors: Li Wei Guang , Han Zhi Dong , Lv Zhen Bei , Duan Yan Hong
Published: September 2011

It is important to reduce asphalt mixture strong absorption characteristics to improve anti-rutting ability and reduce the urban heat island effect. This paper firstly studies the suction and exothermic regular pattern of existing three types, five kinds of asphalt pavement structure. It turns out that there are differences in suction and exothermic characteristics of different types of pavement structure. Suspension close-grained type structure has higher adiabatic heating; gap-type skeleton has faster speed of suction and exothermic; and dense skeleton has more total quantity of heat storage. Accordingly, test and analysis of cooling effect of Gap-type skeleton asphalt pavement has conducted by adopting smear reflective materials to reduce reflectance and surface adding insulation materials, The results show that reducing reflectivity is the best way which can reduce by 5 centigrade around. In addition , improving effectiveness has also been studied by adding light-colored stone partly replacing mineral aggregate, and substituting busing mullite for aggregate below2.36 mm is the best cooling way ,which can reduce by 3.3 centigrade.
Contrast Study on Prediction Models of the Post-Construction Settlement of Embankment in Saline Soil Area
Authors: Lai Tian Wen , Zhou Qi Yun
Published: September 2011

Post-construction settlement is one of the main issues in high grade railway construction in saline areas. The efective solution to the problem is to find the post-construction settlement law for the guidance to the design and construction based on the field monitored data. After analyzing the large quantities of monitored data from the second double line of Lanzhou-Xinjiang Railway in saline areas, a new model is put forward. The standard hyperbolic model, the modified hyperbolic model and exponential model were applied to the forecasting settlements based on the same monitored data to test the presented new model. By comparing fitting, forecasting accuracy and stability of different methods, show that the new model has a high prediction accuracy and good stability, and the forecasting data agree well with the monitored data. The new model presents a new method for analysis and prediction of settlement, and it is found to be a good reference to post-construction settlement of embankment in saline areas.
The Research on the Anti-Icing and Pavement Performance of the Chloride-Stored Asphalt Mixture
Authors: Zhao Xiao Hua , Zhang Xie Dong
Published: September 2011

Based on the feasibility analysis of the chloride’s released capability, a certain proportion of the chloride was added into the ordinary asphalt mixture to form a new chloride-stored asphalt mixture. The mixing proportion was determined and its pavement and anti-icing performance were analyzed. The research indicates that: the stored chloride has good releasability. The new asphalt mixture not only has better high temperature stability and low temperature anti-bending capability than the ordinary one, but could also remove the road ice effectively.
Research on the Rail Transit Station Spacing Based on Passenger Travel Choice
Authors: Dai Qi Qi , Li Yuan Fu , Wang Fang , Wang Ying
Published: September 2011

From the traveler’s view, this paper uses random utility theory of the disaggregate model to construct travelers transportation choice model, employ software STATA to calibrate parameter for getting utility function for prediction, and then employ the critical condition which make rail transit and regular transit coordinated to calculate reasonable rail transit station spacing. Finally, example is given, the results show that rail transit station spacing based on passenger travel choice, make rail transit and regular transit to achieve harmonization and complementarities, and improve overall operating efficiency of urban transit system.
Application of Inverted Function to Alignment Optimization Design of Interchange Ramp
Authors: Zhang Chi , Yang Shao Wei , Zhang Min
Published: September 2011

For adopting to the difficult terrain and restricted conditions, a probability of using the concept of inverted function into interchange linear to optimized design is built, which use the inverted function y=a/x as the interchange right-turn ramp linear. This function can be corresponded to the vehicle trajectory, decrease the area and cut the cost of interchange compared with the ordinary way“spiral-circle-spiral”.By the analysis of how to use this function linear to be ramp, this paper get the way to set the ends of the ramp by circular curve or spiral curve. And this paper also take application example to illustrate the specific solution of how to use the inverted function to set the interchange right-turn ramp.
Test Analysis on Shear Resistance Performance between Rubber-Asphalt Waterproofing Adhesive Layers
Authors: Li Zheng Zhong , Wu Jing Hai , Song Xiao Yan
Published: September 2011

Based on the indoor shear test stimulation of the interface bonding force status of concrete bridge deck waterproof layers, conduct systematically analysis of various factors and regulations in layer shear resistance, in terms of asphalt spraying amount, gravel spreading type, bridge panel interface treatment conditions and environmental temperature, etc, to propose various technical measures for improving the shear resistance performance between rubber-asphalt waterproofing adhesive layers thus provide experimental basis and data support for the practical applications and construction quality. Research concludes that: in order to give full play to the shear resistance performance between rubber-asphalt waterproofing adhesive layers, the shear resistance and bond performance in high temperature state must be strictly controlled, the spray volume and spray temperature should be controlled at 1.8~2.2 kg/m2 and 190~200 °C.Meanwhile, the spreading gravels should be clean with preheating treatment, the diameter ranging from 2.36 mm to 4.75 mm; the spraying volume should be about 10kg/m2. In addition, the bridge panel surface coarseness should be controlled within a reasonable context, when the anti-sliding value is between 45 to 55, the maximum value of interlayer shear resistance strength appears.
Research on Prediction Method of Soft Soil Foundation Settlement
Authors: Dong Xiao Ma
Published: September 2011

The current prediction methods of foundation settlement have biggish error under the condition of lesser foundation settlement observational datum. Aim at the localization of present prediction methods and the virtues of Support Vector Machine arithmetic, the method of predicting soft soil foundation settlement based on Least Square Support Vector Machine (LS-SVM) was proposed in this paper and compared with the neural network method and curve fitting method. The research results show that this proposed method is feasible and effective for predicting soft soil foundation settlement. Least Square Support Vector Machine provides a more advanced method than these conventional methods for predicting foundation settlement.
Research on Dynamic Load Coefficient Based on the Airfield Pavement Roughness
Authors: Zhang Xian Min , Sun Li Li , Hu Chun Fei , Sun Zhi Chao
Published: September 2011

It applies flight dynamics and vibration principle to create vibration model of aircraft landing gear considering aircraft tire damping, and get the equation of analytical solution based on the impact on airfield pavement roughness. It studies the relationship between dynamic load coefficient and time and speed and roughness. For a special aircraft, it gives the allowable level for pavement roughness based on the influence of pavement and passengers comfort.
The Application of Stochastic User Equilibrium Model to Traffic Diverging during Highway Expanding Construction
Authors: Jiang Li , Lang Yu Qing
Published: September 2011

Stochastic User Equilibrium (SUE) model is equivalent to the problem of Stochastic User Equilibrium, and the solution is unique, so SUE model could be applied to traffic diverging during highway expanding construction. In this paper, SUE model is used with the expanding construction of Tongji highway(G010). Firstly transverse interference and parameters of travel time are adjusted according to the actual situation. And then the linear growth rule is used to predict the current theory traffic, based on which we use SUE model to divert the traffic in Tongji highway(G010) during expanding construction. Through the comparison between the calculation results and the actual traffic, we have validated the reliability of the calculation results and the rationality of the model.
Simulation and Analysis of the Variable Speed Limit Controls on Highway Maintenance
Authors: Shi Bai Ying , Gao Xue Yu , Ge Zhi , Ma Xue Ping
Published: September 2011

Despite of the fact that the traffic control zone for maintenance work (work zone) has been recognized as one of major priorities to guarantee the traffic safety, only one conventional posted speed limit (PSL) strategy is applied into the organization and management. This article presents the strategy of the variable speed limit (VSL) on highway work zones that brings about gradual deceleration and low speed variance. To evaluate the safety of the proposed VSL strategy, this study uses the microscopic simulation software VISSM to estimate the traffic flow and adopt transversal and longitudinal coefficients of safety (MSDE and cv) to compare the different speed limit strategies. The results of simulation and analysis confirm that VSL yield a substantial decrease the traffic turbulence caused by speed limit and increase the traffic safety throughout work zones.
Study on City Road Network Reserve Capacity under Ice and Snow Condition
Authors: Ma Yan Li , Han Li Fei , Pei Yu Long
Published: September 2011

To study the reserve capacity of city road network under ice and snow condition，the upper programming model was build on the basis of travelers’ demands on level of service, which was incarnated on capacity of links, and travel time reliability, while user equilibrium (UE) was set up in the lower programming model. Then, sensitivity analysis was applied to solve the bi-level programming model under ice and snow condition. At last, one simulation network example was given to demonstrate the practicality of the given model, and the result showed that the ice and snow condition and the travelers’ demands on level of service had great impact on the road network reserve capacity. The methodology is useful and applicable to evaluate road network under ice and snow condition and lays the foundation for capacity reliability.
Research on PDL Ticket Pricing in Light of Service Quality
Authors: Liu Jie , He Shi Wei , Jiang Jin Liang
Published: September 2011

Due to the similarity of passengers source in long distance transportation, competitions among passenger dedicated line(PDL), existing railway lines and air transportation are severely. First of all, analyzing the element which influence travelers choice, then a competition model for these three modes of transportation are gotten, which mainly take ticket price, comfort and travel time into account. In the process of competition, the ticket price adjustment can affect the service quality. Therefore, in this paper using the average crowding degree to measure service quality, under the promise the guarantee of the service quality of transportation modes, a PDL ticket price model based on the service quality is formulated, and the LINGO software be used to solve this model. At last the PDL of Jing-guang is chosen as an example to calculate the ticket price of PDL. The result shows that in order to meet the required of service quality of each transportation mode, the ticket price of PDL should no less than RMB 700.
Influence of the Moving Bottleneck on the Traffic Flow on Expressway
Authors: Li Qiao Ru , Pan Yue Xiang , Chen Liang , Cheng Chang Guang
Published: September 2011

The mix rate of large trucks is extremely high on expressway in China. The influence of moving bottleneck on the traffic flow of the expressway is particularly serious. The moving bottleneck, formed due to the overtaking of the low-speed trucks, is analyzed with the kinematic wave theory and simulated by utilizing the VISSIM software. Simulation results indicate that increase of the traffic flow and the mix rate of trucks could aggravate the influence of the moving bottleneck on the traffic states, and decrease the speeds of cars significantly. This leads to the insufficient use of the expressway resources. The study result can contribute to the traffic capacity analysis of the expressway.
Comprehensive Optimization Model of Stage Development about Marshalling Stations
Authors: Wang Yang , Wang Li Juan , Zhang Tian Wei , Zhou Qing Dong
Published: September 2011

With the changes of composition about railway freight and car, the development process from small to big was experienced to many marshalling stations. Various possible schemes were faced when stations were expanded, how to choose so as to minimize the total investment for all stages was concerned by the decision makers. Based on the actual development, the dynamic planning model was built. Minimizing the total investment in the design stages was the objective function, subject to three groups: first is the sorting capacity was to meet the demand, second was the utilization of sorting capacity was not too low, the last was the capacity was larger and larger. Taking into account the difficulty of solving model directly, this model is transformed into shortest path model. The specific solution is expounded through an example application, the use area of the model is described in the end.
The Seismic Stability Numerical Analysis of Embankment High Slope with Different Filling
Authors: Wu Jin Liang , Zhang Yong Xing , Peng Nian
Published: September 2011

In recent years, frequent earthquakes had happenned everywhere in the world.Through establishing soil dynamic constitutive model and boundary conditions, implement finite element numerical analysis of embankment high slope of different filling, using large geotechnical software GEO–SLOPE, inputting El Centro wave, Taft wave and artificially wave according to requirements specification fitting respectively in this article.Results show that different degree earthquake will reduce the stability safety coefficient of embankment slope, the properties of embankment high slope of different filling is worse,the range of reduction is larger.
Spatial Analysis Based Urban Road Network Partition Method for Macroscopic Evaluation
Authors: Zou Wen Jie , Weng Jian Cheng , Rong Jian , Zhou Wei
Published: September 2011

In order to improve the reliability of urban road network operation evaluation, the road network regional Partition methods were launched in this paper. The geographic grid was introduced first, and a 4-level road network model was defined. Then, the spatial analysis based urban road network division method was proposed by analyzing the characteristics of road network operation. This method can reflect the influence between adjacent regional units, and improve the reliability of urban road network division. Finally, this research took a certain area in Beijing as a case study, and divided the road network as several regional units. Macroscopic evaluation result shows that it is effective for scientifically describing the road network operation status.
A Method of Parameter Design for Passenger Train Line Plan Based on Multi-Agent Model
Authors: Jiang Xi , Wu Lin Ke , Bao Yun
Published: September 2011

The basic framework of passenger train line plan is determined by its parameters. Considering the association between passenger train line plan and the travel choice behavior of passengers, the paper introduces the distributed artificial intelligence to study decision-making process of passenger train line plan and builds up the multi-agents based model of matching between transport demand and transport resource. Based on this, the paper puts forward a method that realizes the parameter optimization for passenger train line plan by using the multi-agents model. This method not only improves the quality of railway passenger product, but also increases the comprehensive benefit of transportation.
Study on Ice-Snow Road and its Traffic Operating Characteristics in Wintry Harbin China
Authors: Hu Li Wei , Pei Yu Long
Published: September 2011

The friction coefficient (FC) will be reduced when the roads is covered by ice-snow, and the traffic operation risk will be increased in the regions(as Harbin Heilongjiang province in China) with high latitudes, whose winter is long and cold , and those conditions led to the reduction of road capacity and the increase of traffic delays. Using the video detection device, one of the traffic flow information collecting devices, a large number of data in the period of ice-snow of cold area are collected, which is the research base of this paper. The macro and micro traffic flow characteristic of urban road under ice-snow conditions is analyzed, such as the traffic flow, the distribution of headway time, and the properties of the speed distribution. The relation models of FC of ice-snow road and speed-volume are built. Then, the traffic flow characteristics are compared between ice-snow and non- ice-snow road. The outcomes studied above are the foundation for analyzing traffic operation and capacity of urban road in the period of ice-snow.
A New Genetic Algorithm for Continuous Berth and Quay Crane Allocation Problem
Authors: Li Na , Jin Zhi Hong , Massami Erick
Published: September 2011

The combined optimization of continuous berth allocation problem and quay crane assignment problem are solved. Considering the real constraints of container terminal, an improved genetic algorithm is proposed. The chromosome is composed of berthing time, berthing location and number of quay cranes. While in the following, specific quay cranes are fixed to assign to ships. Through comparisons with the former two literatures, the results are improved averagely by 33.78% and 28.57% respectively by the proposed genetic algorithm, which shows its effectiveness.
An Investigation of the Planning and Designing of Road Network in Logistical Parks
Authors: Chen Dui Yong , Zhang Hui Li
Published: September 2011

As a component of the urban transportation system, on the one hand, traffic in logistical parks shares the common features of urban transportation; on the other hand, it still possesses its own rules and characteristics. This paper makes a comparison between traffic in logistical parks and cities and gives an analysis of the logistical parks’ traffic characteristics by using traffic engineering theory, thus to make a clear distinction between traffic in logistical parks and cities， to have a study of the traffic characteristics in logistical parks, and on the basis of this to make an exploration of the characteristics the planning and designing of road network in logistical parks.
Optimization of Container Terminal Unloading Operations Based Upon Multistage Flexible Flowshop Scheduling
Authors: Massami Erick , Jin Zhi Hong
Published: September 2011

Modeling unloading operations at maritime container terminals has increasingly become crucial to container terminal planners. This paper presents the multistage flexible flowshop scheduling problem (MFFSP). The objective of the MFFSP is to determine a schedule that minimizes the schedule length for a given number of containers and handling equipment over a finite planning horizon. Since the MFFSP is NP-hard in the strong sense, metaheuristic solution method is employed. A global lower bound to measure the efficiency of the metaheuristic procedure is derived. The optimization procedure is based on Genetic Algorithm (GA) which is used to estimate the minimum schedule length for a number of problem instances. Computational experiments validate the developed MFFSP.
Applying Genetic Algorithm for Min-Max Vehicle Routing Problem
Authors: Ren Chun Yu
Published: September 2011

The present study is focused on the Min-Max Vehicle Routing Problem (MMVRP). Genetic algorithm is used to get the optimization solution. First of all, use natural number coding so as to simplify the problem; apply insertion method so as to improve the feasibility; retain the best selection so as to guard the diversity of group; adopt 2- exchange mutation operator to strengthen the partial searching ability of chromosome. Secondly, the improved route crossover operation can avoid destroying good gene parts. Finally, the good performance of improved algorithm can be proved by experiment calculation and concrete examples
Studies on Risk Pre-Warning and Emergency Treatment of Thermal Coal Supply Chain
Authors: Lu Jing , Chen Jie , Qi Shi Long
Published: September 2011

With the influence of many factors such as policy, economy and natural environment, large-scale coal enterprises face kinds of risk. The way how to identify and control the risk is becoming the focus of them. From the angle of supply chain link, with the method of questionnaire and on-the-spot investigation, twenty kinds of risk factors are identified and determined. A set of index system of coal supply chain evaluation is established. And the SVM model is used to evaluate the harm degree of risk factors. Risk control solutions-“three-level inventory” risk pre-warning and emergency response mechanism is formulated. The index of evaluation roundly considers risk factors in every link of supply chain. The “three-degree inventory” risk pre-warning and emergency treatments mechanism can provide effective reference for decision-makers.
The Research on Location of Multi-Level Network Distribution Centers
Authors: Wu Ying , Lu Yi , Li Yang
Published: September 2011

This paper studies the time matter in distribution center’s service level, states a model’s preconditions and constructs a location model of multi-level disribution center which concerns the time matter. In solution, it studies the advantages and disadvantages of genetic algorithm, proposes a mixed strategy, designs the HGA program and studies the application of HGA in the location model of distribution center. In the end , it shows the practicality and correctness the proposed methods and models by the application in the practical case.
Developing a Competitive Strategy for the Port of Qingdao: An Application of the Analytic Hierarchy Process to Ports in Bohai Bay
Authors: Lv Yan Chang , Cullinane Kevin , Lu Ping
Published: September 2011

Container handling in the ports of the Bohai Bay region is analyzed from the perspective of the competitiveness of the Port of Qingdao. The Analytic Hierarchy Process (AHP) method is applied to this problem based on the main factors affecting the competitiveness of container handling. The results of the analysis suggest that the Port of Qingdao possesses both current and potential future competitive advantage. The paper concludes with some strategic measures and suggestions for boosting the competitiveness of the Port of Qingdao.
The Research of Vehicle Braking Performance Uncertainty Based on Probabilistic Perturbation
Authors: Xiao Guang Bing , Han Bao Rui , Min Yong Jun , Qiu Qi Wen
Published: September 2011

Stochastic theory and probabilistic perturbation are introduced in this paper. According to the instantaneous speed and maximum braking force, the vehicle braking performence evaulation is established, in which the uncertainty of stochastic parameters are analysed. Compared with that of Monte-Carlo’s, the result shows that the accuracy of the braking performance is improved.
Research on Steering Characteristics of Multi-Axles Steering Vehicle
Authors: Wang Yun Chao , An Er Zhong , Zhou Mei
Published: September 2011

A 3-DOF multi-axle steering vehicle model were established using Lagrangian analysis method, including steering system stiffness, cornering stiffness and power steering system. The vehicle model is verified correctly and universally by using front wheels steering vehicle model. Based on the vehicle model, the steady circling parameters of multi-axle steering vehicle are presented. The effects of vehicle physical parameters on the steering characteristics of multi-axle steering vehicle are analyzed. To further demonstrate the correctness of multi-axle steering vehicle model, a three-axle steering vehicle model were built by ADAMS software. It is a theoretical basis for the design of multi-axle steering vehicle and the evaluation of steering characteristics.
The Analysis and Solvement of some Geotechnical Topics in Post-Disaster Reconstruction Highway
Authors: Chai He Jun , Zhang Chang Lin , Meng Yun Wei , Li Hai Ping
Published: September 2011

The highway in earthquake region suffered serious damage during Wenchuan’s Earthquake in 2008. In all projects of post-disaster reconstruction, the reconstruction of highway and making highway work once again are prerequisite. There are a plenty of rock fall, dangerous rock, landslide, and debris flow sections along the highway between epicenter areas Wenchuan County to Li County. Among the post-disaster reconstruction of the highway, efficiently solvement of these disaster or potential disaster is one of geotechnical engineering topics. Phyllite rock occurs in large number along the highway but is defective fillings. This kind of material if not made full used, it will be able to lead to filling shortage and environmental disruption. How to treat it as a resource for roadbed fillings is the second of the important geotechnical engineering topics in the highway reconstruction. There are many narrow sections along the highway, and Inside Mountain is not stable. Common anti-skating retaining wall is not fit the severe condition because of its basement dug being harmful for mountain slope steady. How to pass this kind of sections is also bottle neck technique. The above technical problems are analyzed and the relevant solutions are proposed. So the troubles are solved efficiently and the highway is open to traffic on schedule. The terms of settlement provide reference for similar highway reconstruction projects.
Analysis and Research of Dynamic Characteristics of Synchronous Belt of a Diesel Using Multi-Body Dynamics
Authors: Li Yi Min , Hao Zhi Yong , Li Jin
Published: September 2011

The dynamic tension of synchronous belt and pulleys forces are obtained by analyzing the dynamic characteristics of timing drive system of a diesel based on muti-body dynamics. The effects of crankshaft speed fluctuation and other excitations on the dynamics characteristics of synchronous belt are illustrated. After the analysis, it is found that crankshaft speed fluctuation has a great influence on the linear and transversal vibrations of synchronous belt. Comparing the simulation results of the original timing system and the one optimized, it is found that the modal frequency of synchronous belt depends on its span. Therefore it is important to control the span of belt and arrange the tensioner pulley properly for timing system design.
Fault Diagnoise of Rolling Bearing Based on EEMD and Instantaneous Energy Density Spectrum
Authors: Lu Jin Ming , Meng Fan Lin , Shen Hua , Ding Li Bing , Bao Su Nin
Published: September 2011

A new fault diagnosis method for rolling bearing based on ensemble empirical mode decomposition (EEMD) and instantaneous energy density spectrum is proposed here. The intrinsic mode functions (IMFs) generated by EEMD can alleviate the problem of mode mixing and approach the reality IMFs. The characteristic frequencies were found in the instantaneous energy density of Hilbert spectrum. The effectiveness of this method was demonstrated by analysis the vibration signals of a rolling bearing with inner-race fault.
CFD Numerical Simulation of Internal Flow for Electronic Gasoline Injector
Authors: Li Xiao Yan , Zhang Zhen Dong , Qian Hao , Cheng Qiang
Published: September 2011

There is increasing demand for a finer atomization of fuel spray in order to improve the engine performance and mileage, reduce exhaust emissions and then improve the transient response. In general, for an engine to comply with this demand, exhaust turbocharger and EGR are necessary especially electronic fuel injection system. As a key part of electronic fuel injection system, the performances of electronic gasoline injector improve the engine power outlet and fuel economy. In other words, electronic gasoline injector can achieve a wonderful dynamic response to improve the combustion process and reduce the exhaust emissions in engine. The aim of this paper is to define a CFD methodology for the simulation of gasoline injector. A two-step work procedure has been adopted. First, three-dimensional computational models of gasoline injector with two kinds of valve seat are created. Then, the simulations are conducted for different geometric parameters of nozzles with properly initialized. The results are used to analysis pressure distribution and the changes of average velocity in the nozzles.
The Combine Friction Material Influence on the Noise of the Vehicle Braking
Authors: Zhang Kun , Jian Chen Ping
Published: September 2011

This paper is mainly about improving vehicle use friction material and reducing vehicle braking noise. With the improvement of friction sheet material prescription as breakthrough point, we aim at raising the friction performance and high temperature capability, so that we can reduce the friction of mating plate efficiently and reduce brake noise. In this experiment combinatorial friction materials research is conducted. Raw materials used are screened by two criteria:1、 select those raw materials which have good wear resistance when they combine with group raw materials; 2、 select those raw materials that have the function of reducing brake noise。 Golden Section approach is utilized for experimental formulations design. Comprehensive index of raw materials is obtained by the relational grade analysis. The fuzzy overall merits method is utilized to judge comprehensive index and evaluates merits of multi-objective friction material formulations, so that we can determine one friction material formulation with the best friction performance. Using fixed-velocity D-MS friction experiment machine we test the crucial property for the autonomous new brake friction material. Test content includes mainly: hot decline, wear rate, blow energy and the friction coefficient of test piece in different experiment temperatures. On fixed-velocity friction experiment machine, we adopt advanced friction vibration and noise experiment methods, use HY104A model of the ordinary sound level analyzer to test in some fixed points, and take autonomous strengthened new brake friction material for object. We analyze and study brake noise that some kinds of friction flats produces. Through observing and analyzing the property of friction material and experiment phenomenon and data, we discover the strong weak level of noise has close relation with friction material formulation and the composition of material. Eventually we can decide the best formulation to degrade the brake nose. Brake friction material is a crucial factor to influence vehicle traveling safety. Through the research of this program we can offer some reference about how to select reasonable friction material group and improve the property of friction flats.
Handling and Stabilities Calculation and Analysis of Automobile Steer by Wire System Driven by Graphic User Interface
Authors: Yu Lei Yan , Wu Zhen Long , Zhao Wan Zhong
Published: September 2011

Automobile steer by wire system (SBW) is a novel steering system. Firstly, the linear four degree of freedom dynamics model with steering torque as the input is built. Then the design ,simulation and multi discipline optimization parameterized platform of SBW is built based on Matlab Graphic User Interface, which can design and simulate steering system performances quickly. Effects of different parameters such as velocity, moment inertia of steering wheel and tire cornering stiffness on handling and stabilities are analyzed. Finally parameters are optimized to minimize the response total variance under torque input and improve the response under steering torque input.
Effects of Driveline and Tire Model on the Performance of Active Differential: Modeling and Simulation
Authors: Ji Jie , Li Yun Wu , Peng He
Published: September 2011

An active differential is introduced with its basic structure and working principle, it consists of a couple of slip clutches for torque transfer and some planetary gears which generate the differential speeds of the slip clutches. A mathematical model of active differential dynamics is developed and it is used for a theoretical analysis of torque transfer and energy loss. Modeling and simulation of the active differential are carried out by using MATLAB/Simulink, the results demonstrate that active differential generates the direct yaw moment by torque transfer between right and left tires and is possible to improve the overall performance of vehicle dynamics properties.