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Investigation of microstructure characteristics of porous asphalt with relevance to acoustic pavement performance

International Journal of transportation Science and Technology 2018年第3期7卷 199-207页

作者： Alber, S. Ressel, W. Liu, P. Hu, J. Wang, D. Oeser, M. Uribe, D. Steeb, H. Institute for Road and Transport Science University of Stuttgart Pfaffenwaldring 7 Stuttgart D70569 Germany Institute of Highway Engineering RWTH Aachen University Mies-van-der-Rohe-Street 1 Aachen D52074 Germany Intelligent Transport System Research Center Southeast University 35 Jinxianghe Road Nanjing 210096 China School of Transportation Science and Engineering Harbin Institute of Technology Harbin 150090 China Institute of Applied Mechanics – Chair of Continuum Mechanics University of Stuttgart Pfaffenwaldring 7 Stuttgart D70569 Germany

Both spatial characteristics and the structure of air voids have certain impacts on the acoustic properties of porous asphalt, with regard to sound absorption behavior. Aside from global parameters of the microstructure, like porosity, certain geometrical characteristics of air voids also have an effect on sound absorption and acoustic parameters. Spatial parameters of the microstructure like 3D fractal dimension or pore diameter distributions are determined from X-ray CT scans, using methods of digital image processing. Geometrical parameters of different porous asphalt samples are compared, and the relationship between the geometry and the acoustic behavior is studied in great detail. In particular, an evolution of the microstructure caused by long-term soiling processes – changes which usually materialize during porous asphalt's service life – and their effects on spatial and acoustic parameters are analyzed. A defined laboratory procedure for artificial soiling has been used to study soiling mechanisms, enabling the correlation to certain soiling states to be drawn. The design of the study shows how more basic analyses of the acoustic deterioration of porous asphalt due to soiling effects during its service life are possible, with the consideration of changes in the air void microstructure. © 2018 Tongji University and Tongji University Press

关键词： Acoustical properties Air voids Porous asphalt Soiling processes X-ray CT

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roadside Infrastructure Planning Scheme for the Urban Vehicular Networks

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transportation Research Procedia 2017年 25卷 1380-1396页

作者： Lixia Xue Yuchen Yang Decun Dong Tongji Architectural Design(Group) Co. Ltd 1230 Si’ping Road Yangpu District Shanghai 200092 China The Key Laboratory of Road and Traffic Engineering Ministry of Education China School of Transportation Engineering Tongji University The Cooperative Centre for Maglev and Rail Transit Operation Control System 4800 Cao’an Road Shanghai 201804 China

Vehicular ad hoc network (VANET) is an emerging technology for future on-the-road applications. However, because of the vehicle mobility uncertainty, the temporal network fragmentation influences the communication connectivity. The roadside unit (RSU) has been considered to support the Vehicle-to-Infrastructure (V2I) communication and to increase the vehicle-to-vehicle (V2V) communication connectivity. Currently, it is impossible to deploy a large number of RSUs at the initial stage of VAENT due to the expensive installation cost, and the authority limitation. This paper proposes a Connectivity-oriented Maximum Coverage RSU deployment Scheme (CMCS), aiming at the maximum V2I communication performance in urban areas. The paper simulates the V2V&V2I network in a real urban area of Chengdu city in China via NS2 and VanetMobisim simulators. Results show that our RSU deployment scheme is able to cover the majority of vehicles on the road and guarantee the communication performance with a reduced number of RSUs.

关键词： Vehicular ad hoc network V2I communication RSU deployment scheme RSU connectivity

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Willingness-to-pay survey and modelling for high occupancy toll lanes: Case study highway 427, Toronto, Ontario

Willingness-to-pay survey and modelling for high occupancy t...

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2017 transportation Association of Canada Conference and Exhibition, TAC 2017

作者： Afaq, Syed Salman Damodaran, Sundar Salek, Soroush Hadayeghi, Ali Strategic Highways Management Office Provincial Highways Management 159 Sir William Hearst Ave Bldg D 7th Floor TorontoONM3M 0B7 Canada System Analysis and Forecasting Office Ministry of Transportation Ontario 777 Bay Street 7th Floor Suite 700 TorontoONM7A 2J8 Canada Transportation Engineering CIMA 3027 Harvester Road Suite 400 BurlingtonONL7N 3G7 Canada Transportation Engineering CIMA 3027 Harvester Road Suite 400 BurlingtonONL7N 3G7 Canada

High Occupancy Toll (HOT) lanes are considered as one of the traffic management strategies to efficiently utilize the available roadway capacity. In order to understand drivers reactions to the planned HOT lane along the Highway 427 corridor in the City of Toronto and estimate the value of time (VOT) and value of reliability (VOR), a web-based stated preference survey was carefully designed and conducted. Using Multinomial Logit (MNL) and Nested Logit (NL) models, the travellers willingness-to-pay was derived as the trade-off between travel time saved and toll incurred. The models were further estimated for different market segments. Copyright © 2017 transportation Association of Canada Conference and Exhibition, TAC 2017. All rights reserved.

关键词： Travel time

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Multi-objective traffic calming measures for roadways passing through rural communities

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Advances in transportation Studies 2016年第38期38卷 59-74页

作者： Lu, W. Jiang, Y. Chen, S. Lu, J.J. Wang, C. Transportation Research Center School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University China Key Laboratory of Road and Traffic Engineering of the Ministry of Education Tongji University Shanghai China College of Transport and Communications Shanghai Maritime University Shanghai China Intelligent Transportation System Research Center Southeast University Nanjing210096 China

This paper evaluates the effectiveness of traffic calming measures from the perspectives of traffic safety performance, environmental and public health impacts and economic benefits. In order to examine their usefulness and applicability to rural roadways passing through small communities, this study applied four traffic calming measures: speed humps, speed tables, raised intersections and roadway narrowings. A driving simulator was used to accurately record driver deceleration, acceleration and lateral offset behavior in built roadway environments, with and without traffic calming measures present. In addition, a vehicle emissions model was used to evaluate the environmental and public health impacts. Furthermore, the cost of each traffic calming measure and the average safety benefit were considered as a function of effectiveness to determine which measures to install. The experimental results show that the most effective treatments were a combination of roadway narrowing and speed tables, except in terms of vehicle emissions. © 2016, Aracne Editrice. All rights reserved.

关键词： Public health

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The Analysis of Space-time Characteristics of Bus Operation and Energy Consumption Based on ArcGIS

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Energy Procedia 2016年 104卷 456-461页

作者： Tang Xiru Zhu Yueyan Xu Liping Beijing Research Center of Urban System Engineering Beijing Key Laborary of Urban Traffic Energy Saving and Emission Reduction and Assessment No.16 Xizhimen South Street Xicheng District Beijing 100035 China School of Transportation Science and Engineering Beijing Key Laboratory for Cooperative Vehicle Infrastructure System and Safety Control Beihang University 37 Xueyuan Road Haidian District Beijing 100191 China

Based on the actual bus operation data, energy consumption data, space-time data of bus operation dada and energy consumption data was integrated through Access database and ArcGIS software. Through the classification statistical analysis, the space-time characteristics of bus operation and energy consumption were concluded, and the relationship between bus operation and energy consumption was also discussed. All the work provides a scientific method for quantitative assessment of bus energy consumption.

关键词： Bus operation Energy consumption Space-time characteristics ArcGIS

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A novel remote monitoring system for water oil pollution assessment in inland river

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ICIC Express Letters, Part B: Applications 2015年第2期6卷 327-334页

作者： He, Wei Wang, Enjun Liu, Xinglong Liu, Chenguang Transportation Engineering Institute Minjiang University No. 1 Wenxian Road Fuzhou University Town Fuzhou China Transportation Research Center Wuhan Institute of Technology No. 693 Xiongchu Road Wuhan China Intelligent Transportation System Research Center Wuhan University of Technology No. 122 Luoshi Road Wuhan China Wuhan University of Technology No. 122 Luoshi Road Wuhan China Wuhan University of Technology No. 122 Luoshi Road Wuhan China

With the development of the shipping industry, marine environmental pollution problems have been increasingly attracting so much attention, but the problem of ship bilge water discharge violations has not been well solved. Based on the analysis of the problems of the current oily water separator monitoring system, a set of improved oily water separator system of monitoring is proposed. The system is integrated with flow sensor, the positioning module and AIS (automatic identification system) transmission module based on the original module. The total amount of dirty oil can be calculated by the oily water separator during a period of time, and when contrasted with the normal discharge of the oil to get the oily water separator operation indicators of the current ship, it can be used as a reference to the maritime administrator. When the ship receives AIS from administrator, it will automatically reply to a packet of query message of the ship operation indicators, thus improving the efficiency of the maritime administrator. © 2015, ICIC International.

关键词： Ships

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Study on influencing factors of public transport attractiveness based on the binary logit model

Study on influencing factors of public transport attractiven...

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14th COTA International Conference of transportation Professionals: Safe, Smart, and Sustainable Multimodal transportation systems, CICTP 2014

作者： Zhou, Feng Huang, Jiajun Xu, Ruihua College of Electronics and Information Engineering Advanced Research Institute of Intelligent Transportation System Tongji University 4800 Cao'an Road Shanghai 201804 China School of Transportation Engineering Tongji University 4800 Cao'an Road Shanghai 201804 China

ISBN: (纸本)9780784413623

With the continued development of accelerated urbanization and the rapid growth of urban population, public transport priority is not only an effective measure to ease urban traffic congestion, but also a requirement of improving the urban living environment and promoting sustainable urban development. How to increase the attractiveness and service level of public transport becomes an important issue. In this paper, an investigation is done to analyze the influencing factors of public transport attractiveness. A binary Logit model is established to evaluate the importance level of the factors affecting their public transport choice under conditions of different travel distances, which can provide basis for relevant government departments to enhance or improve the service quality of public transport. The results show that either the influence factors of trips with different distances (long distance, middle distance, and short distance) or the impact extent are not the same. © 2014 American Society of Civil Engineers.

关键词： Urban transportation

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A model-based crash prediction technique for Chinese roadway segments 21

A model-based crash prediction technique for Chinese roadway...

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21st World Congress on Intelligent Transport systems: Reinventing transportation in Our Connected World, ITSWC 2014

作者： Vaghefi, Seyed A. Jafari, Mohsen A. Jafari, Bobby Rezvani, Amir Zahiredin Gang, Tao Al-Khalifa, Khalifa Nasser M.N. Industrial and System Engineering Center for Advanced Infrastructure and Transportation Rutgers University PiscatawayNJ08854 United States Enterprise Asset Management Group BedminsterNJ07921 United States Anhui Keli Information Industry Co. Ltd. Hefei China Qatar Road Safety Studies Center Qatar University Doha Qatar

This paper presents development and application of a statistical crash prediction model for various types of crashes in Chinese roadway segments. The model is constructed based upon a Negative Binomial Generalized Linear Model and is applied for a large amount of data collected from a wide range of urban, suburban and rural areas. The Negative Binomial Regression proposes a link function to fit a set of roadway characteristics data and traffic flow with crash frequency and at the same time handles the overdispersion problem. Through a real-world example, the performance of the model is evaluated and practical issues regarding input data quality issues and model validation are discussed. The results reveal that the proposed model can appropriately predict the crash data and enables safety traffic engineers to identify and prioritize the high crash locations and diagnose the roadway characteristics, which significantly affect the crash frequencies.

关键词： Regression analysis

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ULTRASONIC WELD BETWEEN AMORPHOUS AND CRYSTALLINE POLYMER WITH INSERITING INTERPOSED MATERIAL

ULTRASONIC WELD BETWEEN AMORPHOUS AND CRYSTALLINE POLYMER WI...

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The 11th China-Japan joint conference on Composite Materials(第十一届中日复合材料学术会议)

作者： Jianhui Qiu Eiichi Sakai Guohong Zhang Department of Machine Intelligence and Systems Engineering Faculty of System Science and TechnologyAkita Prefectural University84-4 Tsuchiya Ebinokuchi YurihonjoAkita015-0055Japan Gansu Province Transportation PlanningSurvey & Design Institute Co.ltd.Integrated Building in Jiuquan Road 213 of Chengguan DistrictLanzhouGansu Province730030China

Ultrasonic welds between crystalline and anmorphous polymers of PMMA-PLA and PMMA-POM are carried out,especially for the immiscible materials pair of *** of the effects of welding conditions and the correlations between welding strengths and interfacial structures are *** joint of PMMA-POM,the functional gradient materials made of PMMA,PLA and PMMA can be used as the IPS to achieve PMMA-POM welds successively,even though the nominal stresses decrease a little.

关键词： Crystalline polymer Amorphous polymer Ultrasonic weld

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Paramics-based microscopic simulation evaluation for urban traffic signal two-stage controller

Paramics-based microscopic simulation evaluation for urban t...

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4th International Conference on transportation engineering, ICTE 2013

作者： Yang, Wenchen Zhang, Lun He, Zhaocheng Rao, Qian Key Laboratory of Road and Traffic Engineering Ministry of Education Tongji University Shanghai 201804 China School of Engineering Guangdong Provincial Key Laboratory of Intelligent Transportation System Sun Yat-sen University Guangzhou 510275 China

ISBN: (纸本)9780784413159

This paper proposes the design and Paramics-based evaluation of a two-stage fuzzy logic traffic signal controller (TSTFC) for an isolated intersection. The fuzzy controller employs traffic intensity-based two stage fuzzy logic procedure, and the design principles of two-stage fuzzy controller are first presented. Then, the COM-based hybrid programming is employed to make the micro traffic simulator Paramics interact with fuzzy controllers developed by Matlab, and a Paramics-based simulation platform of TSTFC is developed via Paramics API. Finally, experiments are conducted on a typical urban isolated intersection, and the performance of the developed two-stage fuzzy control simulation model is validated by comparison to those of fixed-time, actuated, and classic fuzzy controllers for different traffic conditions. Extensive simulation results have demonstrated the potential of developed hybrid programming in time efficiency and simulating real traffic conditions and indicated that the signal strategy derived from TSTFC is more effective when traffic status at intersections is above low saturation. © 2013 American Society of Civil Engineers.

关键词： Fuzzy logic

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