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Research on common issues for relationship between mechanism degree of freedom,driving link and executive link

Science china(Technological Sciences) 2009年第4期52卷 966-974页

作者： WANG AiLun college of mechanical & Electrical engineering, Central South university, changsha 410083, china Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing, Ministry of Education, changsha 410083, china 1. college of mechanical & Electrical engineering Central South University Changsha 410083 China 2. Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing Ministry of Education Changsha 410083 China

During engineering practice and theoretical research, the mechanism degree of freedom is sometimes unequal to the number of the driving link, which is unable to be explained according to the classic theory of the mechanism degree of freedom. To solve this problem, the duality description for operating laws of mechanism is introduced based on the concepts of duality. The Junction-Structure Equation is established for the port descriptions of general ideal mechanism and the functional description for the mechanism degree of freedom is described by utilization of bond graph theory. The force-transfer de- gree of freedom, i.e. the antithesis concept of movement-transfer degree of freedom, is introduced and defined based on the analysis of energy transfer as well as the analysis of signal causality. By utiliza- tion of structural description, functional description and duality description for the equation of degree of freedom, the relationship between the movement-transfer degree of freedom and force-transfer de- gree of freedom is further explored and analyzed. Thus, the relationship between the mechanism de- gree of freedom upon the driving link and the executive link is described generally. Finally, some typical relationships between the mechanism degree of freedom, the driving link and the executive link are analyzed.

关键词： duality bond graph Junction-Structure Equation driving link executive link degree of freedom

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Effect of Tocopherol on Antioxygenic Properties of Green Lubricating Oil

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Journal of Wuhan university of Technology(Materials Science) 2008年第3期23卷 289-292页

作者：肖志信 college of mechanical and Electrical engineering Central South University Department of mechanical engineering Hunan Institute of TechnologyHengyang 421002China

Based on the needs of green motor oil, and in order to improve the antioxidation properties of green lubricating oil, the effect of tocopherol antioxidation properties of rapeseed oil was studied. Experiments of high temperature oxidation, antiwear and infra-red spectrum analysis were accomplished, the results show that the rapeseed oil including tocopherol can still keeps steady structure after high temperature oxidation, with a small variety of acid number, whose antioxygenic properties are improved evidently. Meanwhile, both thiocarbamate and vitamin C play an assistant role in tocopherol, which can make rapeseed oil to have better oxidation stability and keep excellent antiwear properties after high temperature oxidation.

关键词： rapeseed oil tocopherol antioxygenic properties

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Finite Element Analysis of Die Geometry and Process Conditions Effects on Equal Channel Angular Extrusion for β-Titanium Alloy

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Journal of Iron and Steel Research International 2012年第10期19卷 54-58页

作者： SI Jia-yong1,2, GAO Fan3, ZHANG Ji3 (1. State Key Laboratory of Powder Metallurgy, Central South university, changsha 410083, hunan, china 2. college of mechanical and Electrical engineering, Central South university of Forestry and Technology, changsha 410004, hunan, china 3. High Temperature Material Research Division, Central Iron and Steel Research Institute, Beijing 100081, china) [a] State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 Hunan China [b] college of mechanical and Electrical engineering Central South University of Forestry and Technology Changsha 410004 Hunan China [c] High Temperature Material Research Division Central Iron and Steel Research Institute Beijing 100081 China

The finite element analysis was applied to evaluate the respective influences of die geometry and process conditions on plastic strain distribution for β-titanium (Ti-13V11Cr3Al) alloy during the equal channel angular extrusion (ECAE). It was found that optimum equal channel angular extrusion die geometry is strongly material dependent. Optimal strain homogeneity in the Ti-13V11Cr3Al alloy may be achieved at r (inner radius)=5 mm, R (outer radius)=3 mm. The equivalent plastic strain increases with increasing friction coefficient. And the better homogeneity of the equivalent plastic strain distribution can be achieved when friction coefficient value is lower. The faster the ram speed is, the lower the homogeneity of the equivalent plastic strain distribution is and the influence is slight. The back-pressure does not help to improve the plastic strain homogeneity, and the increasing temperature has a slightly favourable effect on the plastic strain homogeneity between 400 and 600 ℃.

关键词： equal channel angular extrusion finite element analysis die geometry β-titanium

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CALCULATION OF ELASTIC ERROR OF PLANAR MECHANISM—AN EQUIVALENT METHOD

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Journal of Central South university 1999年第1期11卷 57-59页

作者： Wang Ailun Zhong Jue Chang Tiegang (college of mechanical and Electrical engineering, Central South university of Technology, changsha 410083, china) college of mechanical and Electrical engineering Central South University of Technology Changsha410083 China

In rigid mechanism dynamic analysis, the equivalence theorem is often used due to its simplicity and perceivability. Based on conjugation and duality between inertia energy storing element and elastic energy storing element, the equivalence theorem is used in elastic error analysis of planar mechanism. A set of calculation formula of elastic error is introduced, and these equations are similar in expression form to the rigid dynamic equation. To demonstrate the method developed, a computation example is given.

关键词： planar mechanism elastic error equivalent flexibility

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Characteristic atom arranging crystallogphy of alloy phases for Au-Cu system

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Science china(Technological Sciences) 2011年第6期54卷 1560-1567页

作者： XIE YouQing1,2,3,LIU XinBi1,2,3,PENG HongJian4,NIE YaoZhuang5,LI XiaoBo6 & LI YanFen1,2,3 1 School of Materials Science and engineering,Central South university,changsha 410083,china 2 Powder Metallurgy Research Institute,Central South university,changsha 410083 china 3 State Key Laboratory of Powder Metallurgy,Central South university,changsha 410083,china 4 School of Chemistry and Chemical engineering,Central South university,changsha 410083,china 5 School of Physical Science and Technique,Central South university,changsha,410083,china 6 college of mechanical engineering,Xiangtan university,Xiangtan 411105,china 1. School of Materials Science and engineering Central South University Changsha 410083 China2. Powder Metallurgy Research Institute Central South University Changsha 410083 China3. State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China4. School of Chemistry and Chemical Engineering Central South University Changsha 410083 China5. School of Physical Science and Technique Central South University Changsha 410083 China6. College of Mechanical Engineering Xiangtan University Xiangtan 411105 China

In this paper,it is pointed out that the descriptions of alloy phase structures are dependent on structural unit *** the systematic science of alloys(SSA),the alloy phase structures are described by means of the symmetry element sequence combining with characteristic atom *** is named the characteristic atom arranging structure,which can display the characteristic atoms at the lattice sites and the micro-inhomogeneity,besides the *** characteristic atom has its own characters:neighboring configuration,potential energy,volume and electronic *** micro-inhomogeneity of alloy phases can be described by concentrations and short-range ordered parameters of characteristic *** differences between the electronic structures of alloy phases and electronic structures of characteristic atoms in the alloy phases are also discussed.

关键词： systematic science of alloys Au-Cu system alloy phase structure micro-inhomogeneity

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Electrochemical characteristics of amorphous MgTi_xNi(x = 0,0.1,and 0.2) hydrogen storage alloys

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Rare Metals 2010年第5期29卷 486-490页

作者： LIU Suqin,ZHAO Wenjuan,HUANG Kelong,and HUANG Hongxia college of Chemistry and Chemical engineering,Central South university,changsha 410083,china college of Chemistry and Chemical engineering Central South University Changsha China

MgTixNi （x = 0, 0.1, and 0.2） alloys were successfully prepared by mechanical alloying （MA）, and the influence of milling time on the electrochemical characteristics of the electrodes was discussed. MgTixNi alloys after 90 h milling displayed the best electrochemical performance The X-ray diffraction patterns showed that the alloy ball-milled for 90 h was amorphous with a widened diffraction peak. The charge-discharge tests indicated that these alloys had good electrochemical activation properties, and the MgTi0.2Ni alloy electrode exhibited the best cycle performance. The initial discharge capacity of the MgTi0.2Ni alloy reached up to 401.1 mAh·g^-1, and the retention rate of capacity was 31.0% after 30 cycles, much higher than that of MgNi （17.3%）. The Tafel polarization curves revealed that Ti addition could enhance the anticorrosion performance of these alloys in alkali solution, which was responsible for the ameliorated cyclic stability of these alloy electrodes.

关键词： hydrogen storage alloys titanium electrochemical properties mechanical alloying

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双连杆内燃机动态仿真

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系统仿真学报 2004年第12期16卷 2780-2782页

作者：易际明杨靖湖南工程学院机械电子工程系湖南湘潭411101 湖南大学机械与汽车工程学院湖南长沙410082

以双连杆内燃机为背景,采用基于底层语言(VC++6.0)与大型软件包(Pro/Engineer)二次开发相结合的开发模式,研究了内燃机装配仿真系统的总体结构,并建立了1126内燃机参数化模型。在此基础上,运用多体动力学的方法对内燃机曲柄连杆机构进... 详细信息

以双连杆内燃机为背景,采用基于底层语言(VC++6.0)与大型软件包(Pro/Engineer)二次开发相结合的开发模式,研究了内燃机装配仿真系统的总体结构,并建立了1126内燃机参数化模型。在此基础上,运用多体动力学的方法对内燃机曲柄连杆机构进行了动态仿真分析,得到了活塞的升程、速度、加速度变化规律,为内燃机的设计改进提供了重要依据。

关键词：双连杆内燃机面向装配的设计动态仿真

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THE PRELIMINARY ATTEMPT TO DEVELOP PREVENTIVE-PREDICTIVE MAINTENANCE

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Journal of Central South university 1995年第2期7卷 32-36页

作者： Bu Yingyong Zhang Huailiang(college of mechanical and Electrical engineering, Central South university of Technology, changsha, 410083, china) 1. college of mechanical and Electrical engineering Central South University of Technology 410083 Changsha China

This paper presents a conception of Preventive-Predictive Maintenance, describes a living instance which combines the technology of equipment condition supervising and failure diagnosing with the system of computer a... 详细信息

关键词： equipment management maintenance computer

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Preliminary study on interaction between plant frictional root and rock-soil mass

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Science china(Technological Sciences) 2010年第7期53卷 1938-1942页

作者： YAN ZhiXin1’2, SONG Yun3, JIANG Ping1’2 & WANG HouYu4 1 Key Laboratory of Mechanics on Disaster and Environment in Western china (Lanzhou university), Ministry of Education, Lanzhou 730000, china 2 School of Civil engineering and Mechanics, Lanzhou university, Lanzhou 730000, china 3 college of Civil engineering and Mechanics, Central South university of Forestry and Technology, changsha 410004, china 4 Air Force engineering Design & Research Bureau, Beijing 100077, china 1. Key Laboratory of Mechanics on Disaster and Environment in Western china (Lanzhou university) Ministry of Education Lanzhou 730000 China2. School of Civil Engineering and Mechanics Lanzhou University Lanzhou 730000 China3. College of Civil Engineering and Mechanics Central South University of Forestry and Technology Changsha 410004 China4. Air Force Engineering Design & Research Bureau Beijing 100077 China

The interaction between lateral root system of woody plant and soil mass is similar to the one between shrub, herbage and soil mass, and has the effect of frictional reinforcement on slope soil. It plays an important role in reinforcing soil strength in shallow slope. Therefore, slope soil mass can be considered as a composite of soil and plant roots and the soil strength and stability of shallow slope soil mass are improved. However, current researches still remain on the level of qualitatively analyzing the relation between root and soil mass. In this paper, some exploratory researches on quantitative analysis of the interaction mechanism between root and soil mass are conducted. With the study of interaction between herbage root system (lateral root system of woody plants) and soil mass, the mechanical model of interaction between frictional root and soil mass is established. The accuracy of the model is verified by field experiments of Pinus Yunnanensis. The mechanical model provides a crucial theoretical guidance to quantitatively analyzing the interaction between plant root and soil mass; it also has certain values in application.

关键词： plant slope protection vegetation for slope protection mechanical model frictional root

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DEVELOPMENT　OF　A　NEW　GENERATION　OF　ADDITIVES　FOR　ALUMINIUM　ROLLING　LUBRICATION

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中国有色金属学会会刊：英文版 1996年第2期6卷 138-143页

作者： Mao Daheng Xiao Gang Ma Wenhong(college of Electro- mechanical engineering ,Central South university of Technology, changsha 410083 Northwest Aluminium Fabrication Plant, Longxi, Gansu 748111) CENT S UNIV TECHNOL COLL ELECTROMECH ENGNCHANGSHA 410083PEOPLES R CHINA NW ALUMINIUM FABRICAT PLANT GANSU 748111PEOPLES R CHINA

ＤＥＶＥＬＯＰＭＥＮＴＯＦＡＮＥＷＧＥＮＥＲＡＴＩＯＮＯＦＡＤＤＩＴＩＶＥＳＦＯＲＡＬＵＭＩＮＩＵＭＲＯＬＬＩＮＧＬＵＢＲＩＣＡＴＩＯＮＭａｏＤａｈｅｎｇ；ＸｉａｏＧａｎｇ；ＭａＷｅｎｈｏｎｇ（ＣｏｌｌｅｇｅｏｆＥｌ... 详细信息

ＤＥＶＥＬＯＰＭＥＮＴＯＦＡＮＥＷＧＥＮＥＲＡＴＩＯＮＯＦＡＤＤＩＴＩＶＥＳＦＯＲＡＬＵＭＩＮＩＵＭＲＯＬＬＩＮＧＬＵＢＲＩＣＡＴＩＯＮＭａｏＤａｈｅｎｇ；ＸｉａｏＧａｎｇ；ＭａＷｅｎｈｏｎｇ（ＣｏｌｌｅｇｅｏｆＥｌｅｃｔｒｏ－ｍｅｃｈａｎｉｃａｌＥ...

关键词： aluminium rolling lubricity additives compound mechanisms

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