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Fabrication and application of nanocrystalline diamond films

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金刚石与磨料磨具工程 2008年第S1期28卷 97-103页

作者： Sun Fanghong~1,Zhang Zhiming~2,Shen Hesheng~2,Guo Songshou~2 (1.school of mechanical engineering,shanghai jiao tong university,shanghai 200240,china 2.Research Institute of Micro/Nanometer Science & Technology, shanghai jiao tong university,shanghai 200240,china)

Nanocrystalline diamond films were deposited on Co-cemented carbide substrates using acetone/ H2/Ar gas mixture by bias-enhanced hot filament chemical vapor deposition（HFCVD） *** evidence of nanocrystallinity,smoothness and purity was obtained by characterizing the sample with scanning electron microscopy（SEM）,X-ray diffraction（XRD）,Raman spectroscopy,atomic force microscopy （AFM ）,and field emission transmission electron microscopy（FE-TEM ）.The results show that nanocrystalline diamond films consists of nanocrystalline diamond grains with sizes range from 20 to 80 nm and contain a large amount of grain *** surface roughness of the films is measured as Ra<*** Raman spectroscopy,XRD pattern,and FE-TEM image of the films indicate the presence of nanocrystalline diamond.A new process is used to deposit composite diamond coatings by a two-step chemical vapor deposition procedure,including first the deposition of the rough polycrystalline diamond and then the smooth fine-grained nanocrystalline diamond *** composite diamond coatings not only display good adhesion and wear resistant properties,but also have smooth surfaces that are liable to *** coating technology can not only meet the requirement of the adhesion of diamond coatings,but also reduce surface roughness of diamond coatings effectively,thus remove the obstacles for the industrialization of CVD diamond *** diamondcoated dies with these composite coatings show obvious effect in the practical application.

关键词： Hot filament CVD Nanocrystalline diamond film Composite coatings Diamond-coated dies

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基于汽车系统动力学的虚拟驾驶仿真模型研究

系统仿真学报 2009年第8期21卷 2281-2284页

作者：柴山荆旭王龙江王树凤刚宪约焦学键山东理工大学交通与车辆工程学院淄博255049 上海交通大学机械与动力工程学院上海200240

基于汽车系统动力学建立了一种包括发动机模型、传动系模型、离合器模型、制动系模型、汽车行驶速度模型、转向系模型的仿真模型。基于以上模型开发的汽车虚拟驾驶仿真系统可以准确地模拟汽车在起步、加速、转向以及制动等各种行驶工况... 详细信息

基于汽车系统动力学建立了一种包括发动机模型、传动系模型、离合器模型、制动系模型、汽车行驶速度模型、转向系模型的仿真模型。基于以上模型开发的汽车虚拟驾驶仿真系统可以准确地模拟汽车在起步、加速、转向以及制动等各种行驶工况的状态以及汽车的各种动力学响应。以上模型为汽车虚拟驾驶仿真系统提供了完整的汽车系统动力学模型,同时,该模型也可进一步应用于汽车的数字化设计,检验汽车的动力学性能。

关键词：系统动力学仿真模拟驾驶动力学模型汽车

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对接机构动力学仿真

上海航天 2011年第6期28卷 17-22,48页

作者：时军委徐峰胡雪平肖余之上海交通大学机械与动力工程学院上海200240 上海市空间飞行器机构重点实验室上海201108

以神舟飞船的对接机构为研究对象,介绍了不同研制阶段仿真的任务规划,给出了研究中的对接机构仿真分析的捕获缓冲参数设计、数字样机、对接过程动力学仿真评估、试验验证与模型修正,以及对接动力学试验等。

关键词：对接机构动力学仿真虚拟样机试验

Experimental Study on Turbulent Structure of Humid Air Flame in a Bluff-body Burner

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Journal of Thermal Science 2009年第2期18卷 185-192页

作者： Bing Ge Shu-Sheng Zang Pei-qing Guo school of mechanical engineering, shanghai jiao tong university, shanghai 200240, china 800, Dong Chuan Road, shanghai, china. Zip: 200240 school of mechanical engineering Shanghai Jiao Tong University Shanghai 200240 China 800 Dong Chuan Road Shanghai China Zip: 200240

The main objective of the present experimental study is to analyze the turbulent structure in humid airnon-premixed flame, and determine the effect of humidity on the flow field and the flame stability limit in turbulentnon-premixed flame. Particle Image Velocimetry (PIV) is used to capture the instantaneous appearance ofvortex structures and obtain the quantitative velocity field. The distributions of Reynolds shear stress, mean androot-mean squared fluctuating (rms) velocities are examined to get insight into the effect of fuel-to-air velocity ratioon velocity flow field. The results show that with steam addition, the air-driven vortex in the bluff-body wakeis thinner; the biggest peaks of rms velocity and Reynolds shear stress are lower; the distance between the peaksof rms velocity on the sides of centerline reduces. Besides these, the flame stability is affected. Both central fuelpenetration limit and partially quenching limit reduce with steam addition.

关键词： humid air combustion turbulence measurement PIV

Nonlinear analysis of slow drift extreme responses of a compliant offshore structure

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Acta Mechanica Sinica 2009年第5期25卷 651-657页

作者： Yingguang Wang Jiahua Tan school of Naval Architecture, Ocean and Civil engineering,shanghai jiao tong university, 200240 shanghai, china school of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University 200240 Shanghai China

This paper first demonstrates that the accuracy and efficiency of the method of numerical simulation often used is not very high in predicting the slow drift surge extreme responses of a compliant offshore structure. Next, the slow drift surge extreme responses of the structure are analyzed via the path integral solution racy and efficiency of the PIS （PIS） method, and the accumethod is found to be higher than those of the numerical simulation method. A compound PIS （CPIS） method is first proposed in this article to further improve the efficiency of the path integral solution method, and the accuracy and efficiency of the CPIS method is validated.

关键词： Compliant offshore simulation Path integral solution solution structure Numerical Compound path integral

The Effect of Body Pitching on Leg-Spring Behavior in Quadruped Running

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Journal of Bionic engineering 2010年第3期7卷 219-227页

作者： Qi Deng, Shigang Wang, Qinghua Liang, Jinqiu Mo school of mechanical engineering, shanghai jiao tong university, shanghai 200240 P. R. china [a] school of mechanical engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China

In this paper we investigated how the running speed would affect the dynamics of body pitching, and whether body inertiais important for animals. Passive trotting of spring-mass model and passive bounding of spring-beam model were studied atdifferent speeds for different sets of body parameters respectively. Furthermore, different body inertias were used in *** found that running speed exerts effect on leg performance by means of centrifugal force. The centrifugal force can be understoodas an enhancement to the natural frequency of the spring-mass system. The disadvantage of body pitching may beoffset by the great increase in centrifugal force at high speed. The results also reveal that body mass distribution might not be themain reason for the difference in maximal running speeds of different animals.

关键词： body pitching leg performance running speed centrifugal force body inertia

Induced electromagnetic stirring behavior in a resistance spot weld nugget

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Science china(Technological Sciences) 2010年第5期53卷 1271-1277页

作者： LI YongBing1,LIN ZhongQin1,2,LAI XinMin1,2,CHEN GuanLong1,2 & ZHANG Ke3 1 shanghai Key Laboratory of Digital Autobody engineering,shanghai jiao tong university,shanghai 200240,china 2 State Key Laboratory of mechanical System and Vibration,shanghai jiao tong university,shanghai 200240,china 3 Welding engineering Institute,shanghai jiao tong university,shanghai 200240,china 1. shanghai Key Laboratory of Digital Autobody engineering Shanghai Jiao Tong University Shanghai 200240 China2. State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University Shanghai 200240 China3. Welding Engineering Institute Shanghai Jiao Tong University Shanghai 200240 China

A multi-physics hybrid numerical model,which couples electric,magnetic,thermal and flow fields,was used to investigate electromagnetic stirring behavior in a resistance spot weld *** differences of two kinds of different excitation inputs,i.e.,a sinusoidal current and its root-mean-square(RMS) value,were studied to examine if they could produce equivalent electromagnetic stirring effects in the weld *** showed that the two types of current inputs could produce almost identical fluid flow and heat transfer patterns and consistent evolution of flow and thermal fields in the *** the end of the welding cycles,the maximum flow velocity and temperature between the two inputs differed by 11.6% and 0.3%,***,the RMS current can be assumed to produce an approximately equivalent electromagnetic stirring effect with the sinusoidal current,and can be used in the future research to greatly improve the solution efficiency of the electromagnetic stirring behavior in the resistance spot weld nugget.

关键词： induced magnetic field electromagnetic stirring resistance spot welding fluid flow heat transfer

Metal chlorides loaded on activated carbon to capture elemental mercury

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Journal of Environmental Sciences 2010年第11期22卷 1814-1819页

作者： Zhemin Shen,Jing Ma,Zhijian Mei,Jianda Zhang school of Environmental Science and engineering,shanghai jiao tong university,shanghai 200240,china [a] school of Environmental Science engineering Shanghai Jiao Tong University Shanghai 200240 China

Activated carbon （AC） was considered to be an effective sorbent to control mercury in combustion systems. However, its capture capacity was low and it required a high carbon-to-mercury mass ratio. AC loaded with catalyst showed a high elemental mercury （Hg 0 ） capture capacity due to large surface area of AC and high oxidization ability of catalyst. In this study, several metal chlorides and metal oxides were used to promote the sorption capacity of AC. As a result, metal chlorides were better than metal oxides loaded on AC to remove gaseous mercury. X-ray diffractometer （XRD）, thermogravimetric analyzer （TGA） and specific surface area by Brunauer- Emmett-Teller method （BET） analysis showed the main mechanisms： first, AC had an enormous surface area for loading enough MClx; second, Cl and MxOy were generated during pyrogenation of MClx; finally, there were lots of active elements such as Cl and MxOy which could react with elemental mercury and convert it to mercury oxide and mercury chloride. The HgO and HgCl 2 might be released from AC’s porous structure by thermo regeneration. A catalytic chemisorption mechanism predominates the sorption process of elemental mercury. As Co and Mn were valence variable metal elements, their catalytic effect on Hg 0 oxidization may accelerate both oxidation and halogenation of Hg 0 . The sorbents loaded with metal chlorides possessed a synergistic function of catalytic effect of valence variable metal and chlorine oxidation.

关键词： mercury activated carbon flue gas metal chloride metal oxide

Kinetic theory of self-condensing vinyl polymerization

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Science china Chemistry 2010年第12期53卷 2429-2439页

作者： ZHOU ZhiPing 1 & YAN DeYue 2 1 school of Materials Science and engineering,Jiangsu university,Zhenjiang 212013,china 2 school of Chemistry and Chemical engineering,shanghai jiao tong university,shanghai 200240,china 1. school of Materials Science and engineering Jiangsu University Zhenjiang 212013 China2. School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 China

This review introduces the kinetic theory of self-condensing vinyl polymerization (SCVP),including the SCVP of AB inimers,the SCVP with non-equal reactivity between A and B groups,the SCVP in the presence of a small amount of multifunctional initiators,also the SCVP of both inimers and *** analytical expressions of various molecular parameters for the resulting hyperbranched polymers,such as the molecular size distribution function,the average molecular weight,the polydispersity index and the degree of branching,are reviewed systematically.

关键词： kinetic theory self-condensing vinyl polymerization (SCVP) hyperbranched polymers