作者机构：
[李欣然; 陈鸿琳] College of Electrical and Information Engineering, Hunan Univ, Changsha, Hunan, 410082, China;[陈国民] School of Mechanical and Electrical Engineering, Hunan City Univ, Yiyang, Hunan, 413000, China;[冷华] Electrical Research Institute of State Grid Hunan Electric Power Company, Changsha, Hunan, 410007, China
通讯机构：
College of Electrical and Information Engineering, Hunan Univ, Changsha, Hunan, China
作者机构：
[潘晴; 范彬] College of Mechanical and Electrical Eng., Central South University, Changsha, 410083, China;[范彬] College of Mechanical and Electrical Eng., Hunan City Univ., Yiyang, 413002, China
会议名称：
International Conference on Design, Manufacturing and Mechatronics (ICDMM)
会议时间：
APR 17-18, 2015
会议地点：
Adv Sci Technol & Ind Res Ctr, Wuhan, PEOPLES R CHINA
会议主办单位：
Adv Sci Technol & Ind Res Ctr
关键词：
Tractor;dual clutch automatic transmission (DCT);jerk;sliding friction work
摘要：
Aimed at the problem that different oil pressure changes of clutch had different effects on the shifting quality of dual clutch automatic transmission (DCT). YTO-1804 tractor was selected as the reference object. The shifting process of tractor's DCT was analyzed and the dynamic models of shifting process were built. The shifting process was divided into five stages. Based on the Matlab/Simulink software platform, the simulation model of the whole shifting process was built. In the plowing condition, the simulation analysis that the different clutch oil pressure changes affected the shifting performance of tractor's DCT was done. The simulation results indicate that with the clutch oil pressure change slope decreasing, the shifting time increases, the jerk degree reduces and the sliding friction work becomes large, which better reflects that shifting quality of tractor's DCT is influenced by the clutch oil pressure changes condition. The basic theory and model foundation for the further research on the shifting performance of tractor's DCT are provided.
作者机构：
[文明才; 阳同光] College of Mechanical and Electrical Engineering, Hunan City University, Yiyang, 413000, China;[阳同光] College of Information Science and Engineering, Central South University, Changsha, 410083, China
通讯机构：
[Wen, M.-C.] C;College of Mechanical and Electrical Engineering, Hunan City University, Yiyang, China
作者机构：
[阳同光] College of Mechanic and Electrical Engineering, Hunan City University, Yiyang, China;[阳同光; 桂卫华] College of Information Science and Engineering, Central South University, Changsha, China
通讯机构：
[Yang, T.-G.] C;College of Mechanic and Electrical Engineering, Hunan City University, Yiyang, China
作者机构：
[阳同光] College of Mechanic and Electrical Engineering, Hunan City University, Yiyang, China;[阳同光; 桂卫华] College of Information Science and Engineering, Central South University, Changsha, China
通讯机构：
[Yang, T.-G.] C;College of Mechanic and Electrical Engineering, Hunan City University, Yiyang, China
期刊：
PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON CHEMICAL, MATERIAL AND FOOD ENGINEERING,2015年22:508-510 ISSN：2352-5401
通讯作者：
Xiao, Hong
作者机构：
[Xiao, Hong] Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.;[Sun, Liang] Hunan City Univ, Coll Mech & Elect Engn, Yiyang 413000, Peoples R China.;[Wang, Na] China Ordnance Ind, Res Inst 203, Wind Tunnel Lab, Xian 710065, Peoples R China.
通讯机构：
[Xiao, Hong] H;Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.
会议名称：
International Conference on Chemical, Material and Food Engineering (CMFE)
会议时间：
JUL 25-26, 2015
会议地点：
Kunming, PEOPLES R CHINA
会议主办单位：
[Xiao, Hong] Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.^[Sun, Liang] Hunan City Univ, Coll Mech & Elect Engn, Yiyang 413000, Peoples R China.^[Wang, Na] China Ordnance Ind, Res Inst 203, Wind Tunnel Lab, Xian 710065, Peoples R China.
会议论文集名称：
AER-Advances in Engineering Research
关键词：
computational fluid dynamics;square;numerical simulation;high-rise;turbulence model
摘要：
A SST turbulence model is applied to solve the Reynolds Averaged Navier-Stokes Equations in numerically simulating the 3D steady wind flow field around the square with high-rise buildings in atmospheric boundary layer. The aerodynamic prediction was supported by velocity data collected in field measurement of 240 points from an campus square. Then a detailed parametric study is performed on velocity distribution. The parameters include wind attack angle, green belt length and the distance between green belts. The analysis results show that numerical simulation is a feasible way to study the wind environment around square and the distributing of velocity. The green belts accelerates the air flow parallel to it. The effect of acceleration depends mainly on the distance between the green belts rather than the length of the green belts. When the wind is southeast or northwest, the maximums velocity in pedestrian height are between buildings. The curved green belts can improve the wind environment rather than linear green belts. The research provides a foundation for the wind resistance design of squares.
摘要：
Summary: Polyaniline (PANI) nanowires and sub‐micro/nanostructured dendrites are synthesized and immobilized on PP‐g‐PAA film surfaces via routine oxidative polymerization of aniline under different conditions, where grafting poly(acrylic acid) (PAA) served as a template and dopant, and SDS as a surfactant. The immobilized PANI enhances the surface hydrophilicity of the poly(propylene) (PP) films, and a superhydrophilic surface is obtained in this way. The mechanism of forming different morphologies of PANI and of correspondingly obtaining a superhydrophilic surface are briefly discussed. FESEM image shows the PANI sub‐micro/nanostructured dendrites immobilized on the surfaces of PP films. The modified surface is highly hydrophilic with a water contact angle of 3°.
作者机构：
[Zhong, WB] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Peoples R China.;Hunan City Univ, Dept Mech, Yiyang 413000, Peoples R China.;Beijing Inst Chem Technol, Dept Polymer Sci, Beijing 100029, Peoples R China.
通讯机构：
[Zhong, WB] H;Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Peoples R China.
摘要：
Polypyrrole (PPy) nanowire networks have been synthesized in high yield (higher than 90%) by chemical oxidative polymerization of pyrrole in the presence of hexadecyltrimethylammonium bromide (HTAB) and organic diacids (oxalic acid, tartaric acid, or glutaric acid) and triacid (citric acid). The diameter of nanowire is 60−90 nm. The influence of reaction conditions, such as polymerization temperature, polymerization time, and the molar ratios of HTAB to organic acids and pyrrole, on the morphologies of the PPy nanowire networks has been systematically investigated. In addition, the interconnected PPy nanoparticles are prepared without using HTAB. The film of PPy nanowire networks and nanoparticles is superhydrophilic. A plausible formation mechanism of PPy nanowire networks is discussed.
