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Dynamics of a self-propelled particle under different driving modes in a channel flow

Chinese Physics B 2017年第1期26卷 260-266页

作者： Zhenyu Ouyang Jianzhong Lin Xiaoke Ku State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou 310027 China

In this paper, a model that combines the lattice Boltzmann method with the singularity distribution method is proposed to simulate a self-propelled particle swimming（exhibiting translation and rotation） in a channel flow. The results show that the velocity distribution for a self-propelled particle swimming deviates from a Maxwellian distribution and exhibits highvelocity tails. The influence of an eccentric potential doublet on the translation velocity of the particle is significant. The velocity decay process can be described using a double exponential model form. No large differences in the velocity distribution were observed for different translation Reynolds numbers, rotation Reynolds numbers, or regular intervals.

关键词： lattice Boltzmann method singularity distribution method self-propelled particle driving modes

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On-road pollutant emission and fuel consumption characteristics of buses in Beijing

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Journal of Environmental Sciences 2011年第3期23卷 419-426页

作者： Aijuan Wang Yunshan Ge Jianwei Tan Mingliang Fu Asad Naeem Shah Yan Ding Hong Zhao Bin Liang National Lab of Auto Performance & Emission Test Beijing Institute of Technology Beijing 100081 China Department of Mechanical Engineering University of Engineering and Technology Lahore 54000 Pakistan Chinese Research Academy of Environmental Sciences Beijing 100012 China College of Mechanical & Electronic Engineering Qingdao University Qingdao 266071 China Beijing Automotive Research Institute Co. Ltd. Beijing 100079 China

On-road emission and fuel consumption （FC） levels for Euro Ⅲ and Ⅳ buses fueled on diesel and compressed natural gas （CNG） were compared, and emission and FC characteristics of buses were analyzed based on approximately 28,700 groups of instantaneous data obtained in Beijing using a portable emissions measurement system （PEMS）. The experimental results revealed that NOx and PM emissions from CNG buses were decreased by 72.0% and 82.3% respectively, compared with Euro IV diesel buses. Similarly, these emissions were reduced by 75.2% and 96.3% respectively, compared with Euro III diesel buses. In addition, CO2, CO, HC, NOx, PM emissions and FC of Euro IV diesel buses were reduced by 26.4%, 75.2%, 73.6%, 11.4%, 79.1%, and 26.0%, respectively, relative to Euro Ⅲ diesel buses. The CO2, CO, HC, NOx, PM emissions and FC factors all decreased with bus speed increased, while increased as bus acceleration increased. At the same time, the emission/FC rates as well as the emission/FC factors exhibited a strong positive correlation with the vehicle specific power （VSP）. They all were the lowest when VSP 〈 0, and then rapidly increased as VSP increased. Furthermore, both the emission/FC rates and emission/FC factors were the highest at accelerations, higher at cruise speeds, and the lowest at decelerations for non-idling buses. These results can provide a base reference to further estimate bus emission and FC inventories in Beijing.

关键词： vehicle specific power PEMS driving modes fuel consumption factors

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Research on output characteristics of linear ultrasonic motor parallel rotating platform

Research on output characteristics of linear ultrasonic moto...

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2011年全国压电和声波理论及器件应用研讨会

作者： Song-Fei SU~* Zhi-YuanYAO Zhao-Feng GE Ming YE State Key Laboratory of Mechanics and control for Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

＜正＞As several linear ultrasonic motors worked together could increase the thrust,the research on linear ultrasonic motors parallel technology received *** study suggested that motor output performances were non-linear superposition relationship in parallel condition,but the research was not *** this paper,the linear ultrasonic motors output characteristics in parallel condition were *** a parallel rotating platform composed by three U-shape linear ultrasonic motors,and researched the relationship of output performances between single motor and the parallel rotating platform in different driving modes and *** the advantages and disadvantages of different driving ways and established motion mechanics model of parallel rotating *** experiments showed that the experimental results agreed well with the theoretical analyses.

关键词： Linear ultrasonic motor Parallel operation driving modes Mechanical model

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