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Microstructure modeling and virtual test of asphalt mixture based on three-dimensional discrete element method

Journal of Central South University 2016年第6期23卷 1525-1534页

作者：马涛张德育张垚赵永利黄晓明 School of Transportation Southeast University Nanjing 210096 China Department of Civil and Environmental Engineering Rutgers the State University of New Jersey N J 08854 USA School of Civil Enginerring and Architecture Nanjing Institute of Technology Nanjing 211167 China

The objective of this work is to model the microstructure of asphalt mixture and build virtual test for asphalt mixture by using Particle Flow Code in three dimensions(PFC^(3D))based on three-dimensional discrete element method.A randomly generating algorithm was proposed to capture the three-dimensional irregular shape of coarse *** then,modeling algorithm and method for graded aggregates were *** on the combination of modeling of coarse aggregates,asphalt mastic and air voids,three-dimensional virtual sample of asphalt mixture was modeled by using PFC^(3D).Virtual tests for penetration test of aggregate and uniaxial creep test of asphalt mixture were built and conducted by using PFC^(3D).By comparison of the testing results between virtual tests and actual laboratory tests,the validity of the microstructure modeling and virtual test built in this study was ***,compared with laboratory test,the virtual test is easier to conduct and has less *** is proved that microstructure modeling and virtual test based on three-dimensional discrete element method is a promising way to conduct research of asphalt mixture.

关键词： asphalt mixture microstructure modeling virtual test discrete element method three-dimensional method

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Highly Fuel-Efficient Transmission and Propulsion Concepts

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Automotive Innovation 2018年第1期1卷 35-42页

作者： Ferit Küçükay Andreas Lange Lin Li Institute of Automotive Engineering(IAE) Technische Universität Braunschweig38106 BraunschweigGermany

The integration of one or more electricmachines into the drivetrain has resulted inmany different powertrain concepts in recent years,ranging from the P2 hybrid to dedicated hybrid transmission(DHT).Two types of DHT with different characteristics are *** first type is the power split hybrid(PS-DHT),which has very low mechanical complexity but needs high electrical effort in the *** second type is multi-mode DHT(MM-DHT),which has a slightly higher mechanical complexity but much less electrical effort when compared with the PS-DHT.A transmission synthesis is used to determine the concept of the *** three different powertrain concepts(i.e.,P2,PS-DHT,and MM-DHT)are analyzed and evaluated regarding fuel economy and *** driving cycles(e.g.,Worldwide Harmonized Light vehicles Test Procedure)and the 3D method(driver,driven vehicle,driving environs)are used to investigate the drivetrain in the context of real driving *** show that the two DHT concepts offer better fuel economy than the P2 hybrid drivetrain while still providing the same or even better driving *** study also shows that new hybrid concepts created with transmission synthesis can lead to further improvements in hybrid powertrains.

关键词： Dedicated hybridtransmission three-dimensional method Drivetraindesign Fuel economy Drivingperformance

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Stress Analysis and Optimum Design of Hot Extrusion Dies

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Tsinghua Science and Technology 2004年第3期9卷 290-293页

作者：帅词俊肖刚倪正顺 College of Mechanical and Electronic Engineering Central South University Changsha 410083 China

A three-dimensional model of a hot extrusion die was developed by using ANSYS software and its second development language—ANSYS parametric design language. A finite element analysis and op-timum design were carried out. The three-dimensional stress diagram shows that the stress concentration is rather severe in the bridge of the hot extrusion die, and that the stress distribution is very uneven. The opti-mum dimensions are obtained. The results show that the optimum height of the extrusion die is 89.596 mm. The optimum radii of diffluence holes are 65.048 mm and 80.065 mm. The stress concentration is reduced by 27%.

关键词： three-dimensional method modeling hot extrusion die optimum design

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The Study on Integration of Information Technology and Engineering Curriculum

The Study on Integration of Information Technology and Engin...

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第5届教育教学改革与管理工程学术年会

作者： Baoping ZHOU Shunguang KANG Limei QI College of Information Engineering Tarim university

The integration of information technology and engineering curriculum plays a very important role in cultivating the modern engineering and technical personnel. And this paper, with respect to the integration of information technology and engineering curriculum, gives an analysis of the significance and the status quo of the integration, and the teaching characteristics of the engineering curriculum, aiming at proposing the three-dimensional integration methods: the realization of three-dimensional curriculum database and the comprehensiveness of curriculum goal in the integration of information technology and engineering curriculum.

关键词： information technology engineering curriculum integration three-dimensional method

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