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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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ON THE CALCULATION OF STRESS INTENSITY FACTOR K FOR FRAME COMPONENTS

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Journal of central south university 1995年第2期7卷 37-41页

作者： Liu Yilun wang ailun(college of mechanical and electrical engineering, central south university of Technology, changsha, 410083, china)He Manjiang(changsha Institute of Mining Research) 1. college of mechanical and electrical engineering Central South University of Technology 410083 Changsha China 2. changsha Institute of Mining Research China

The stress intensity factor K in the tip of crack which is in the corner of the frame component has been calculated indirectly by means of numeric calculation of J Integral. Some laws and relationships among the stres... 详细信息

关键词： intensity factor J Integral frame component

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EXTRAPOLATING METHOD IN PLOT FOR FATIGUE LIFE PREDICTION OF COMPONENTS

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中国有色金属学会会刊：英文版 1996年第3期6卷 153-156页

作者： Liu Yilun wang ailun(college of mechanical and electrical engineering,central south university of Technology, changsha 410083) CENT S UNIV TECHNOL COLL MECH & ELECT ENGNCHANGSHA 410083PEOPLES R CHINA

ＥＸＴＲＡＰＯＬＡＴＩＮＧＭＥＴＨＯＤＩＮＰＬＯＴＦＯＲＦＡＴＩＧＵＥＬＩＦＥＰＲＥＤＩＣＴＩＯＮＯＦＣＯＭＰＯＮＥＮＴＳ￥ＬｉｕＹｉｌｕｎ；ＷａｎｇＡｉｌｕｎ（ＣｏｌｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔ... 详细信息

ＥＸＴＲＡＰＯＬＡＴＩＮＧＭＥＴＨＯＤＩＮＰＬＯＴＦＯＲＦＡＴＩＧＵＥＬＩＦＥＰＲＥＤＩＣＴＩＯＮＯＦＣＯＭＰＯＮＥＮＴＳ￥ＬｉｕＹｉｌｕｎ；ＷａｎｇＡｉｌｕｎ（ＣｏｌｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔｒｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ，...

关键词： extrapolation plot fatigue life

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MOTION ANALYSIS AND DESIGN OF ACCUMULATOR FOR HYDRAULIC ROCK DRILL

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中国有色金属学会会刊：英文版 1996年第2期6卷 148-151页

作者： Liu Shixun(college of mechanical and electrical engineering, central south university of Technology, changsha 410083) CENT S UNIV TECHNOL COLL MECH & ELECT ENGNCHANGSHA 410083PEOPLES R CHINA

ＭＯＴＩＯＮＡＮＡＬＹＳＩＳＡＮＤＤＥＳＩＧＮＯＦＡＣＣＵＭＵＬＡＴＯＲＦＯＲＨＹＤＲＡＵＬＩＣＲＯＣＫＤＲＩＬＬＬｉｕＳｈｉｘｕｎ（ＣｏｌｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔｒｉｃａｌＥｎｇｉｎｅｅｒｉ... 详细信息

ＭＯＴＩＯＮＡＮＡＬＹＳＩＳＡＮＤＤＥＳＩＧＮＯＦＡＣＣＵＭＵＬＡＴＯＲＦＯＲＨＹＤＲＡＵＬＩＣＲＯＣＫＤＲＩＬＬＬｉｕＳｈｉｘｕｎ（ＣｏｌｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔｒｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ，ＣｅｎｔｒａｌＳｏｕｔｈＵｎ...

关键词： hydraulic accumulator diaphragm service life stretching ratio parameter design,motion analvsis

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The Influence of Some Key Parameters on Fatigue Life of Common Metallic Components

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Journal of central south university 2000年第3期12卷 159-161页

作者： LIU Yi lun (college of mechanical and electrical engineering, central south university, changsha 410083, china) 1. college of mechanical and electrical engineering Central South University 410083 Changsha China

The effect of key parameters on fatigue life of common metallic components, e.g. steel, aluminium alloy, has been analysed quantitatively. The influential coverage and degree of these parameters have been investigated systematically, some phenomena which can′t be discovered with qualitative analysis method have been revealed, a series of valuable conclusions has been obtained, which would be very beneficial to fatigue resistant design and improvement of anti fatigue ability of metallic components.

关键词： metallic material component fatigue life key parameter effect

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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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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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SURFACE ROUGHNESS EFFECTS IN ALUMINIUM ROLLING

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中国有色金属学会会刊：英文版 1996年第3期6卷 157-160页

作者： Tan Jianping Zhong Jue Yang Ping(college of mechanical and electrical engineeringcentral south university of Technology, changsha 410083) CENT S UNIV TECHNOL COLL MECH & ELECT ENGNCHANGSHA 410083PEOPLES R CHINA

ＳＵＲＦＡＣＥＲＯＵＧＨＮＥＳＳＥＦＦＥＣＴＳＩＮＡＬＵＭＩＮＩＵＭＲＯＬＬＩＮＧ￥ＴａｎＪｉａｎｐｉｎｇ；ＺｈｏｎｇＪｕｅ；ＹａｎｇＰｉｎｇ（ＣｏｌｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔｒｉｃａｌＥｎｇｉ... 详细信息

ＳＵＲＦＡＣＥＲＯＵＧＨＮＥＳＳＥＦＦＥＣＴＳＩＮＡＬＵＭＩＮＩＵＭＲＯＬＬＩＮＧ￥ＴａｎＪｉａｎｐｉｎｇ；ＺｈｏｎｇＪｕｅ；ＹａｎｇＰｉｎｇ（ＣｏｌｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔｒｉｃａｌＥｎｇｉｎｅｅｒｉｎｇＣｅｎｔｒａｌＳｏｕ...

关键词： rolling oil film thickness surface roughness

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OPTIMAL CONTROL OF AN ACTIVE SUSPENSION SYSTEMEMPLOYING HIGH SPEED ON/OFF SOLENOID VALVE

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Journal of central south university 1997年第2期9卷 137-140页

作者： Liu Shaojun Zhong Jue Li Qingchun (college of mechanical and electrical engineering,central south university of Technology, changsha 410083, china)HironaoYAMADA YoshikazuSUEMATSU(NAGOYAuniversity Japan) college of mechanical and electrical engineering Central South University of Technology Changsha 410083 China NAGOYA university Japan

Previous studies have confirmed that an active suspension system with high speed ON/OFF solenoid valves could provide the same vibration isolation efficiency as that of system with pressure proportional valve. In this study, by using Linear-quadratic optimization technique and Kalman filter method, an optimal regulator controller with a state observer was designed for the proposed system. Simulation and experimental research was conducted on a quarter car model. The simulation analysis of the system frequency characteristic suggested that the peak value of magnitude response curve in the case of system with an optimal controller would be lowered significantly, and the experiment results also showed that an improvement in the vibration isolation effect was obtained in using the designed optimal controller over the sky hook damper controller.

关键词： active suspension high speed ON/OFF solenoid valve optimal control

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DECOUPLED MODEL FOR FLATNESS CONTROL IN 4-H CVC COLD ROLLING MILLS

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中国有色金属学会会刊：英文版 1998年第4期8卷 185-187页

作者： Zhong Jue and Chen Jie college of mechanical and electrical engineering, central south university of Technology, changsha 410083, P. R. china

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｐｒｅｃｉｓｅｃｏｎｔｒｏｌｏｆｒｏｌｇａｐｉｎ４ｈＣＶＣｍｉｌｓｉｓｐａｒｔｉｃｕｌａｒｌｙｄｉｆｉｃｕｌｔｄｕｅｔｏｔｈｅｃｏｍｐｌｅｘｉｎｔｅｒａｃｔｉｏｎｓｂｅｔｗｅｎｗｏｒｋ... 详细信息

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｐｒｅｃｉｓｅｃｏｎｔｒｏｌｏｆｒｏｌｇａｐｉｎ４ｈＣＶＣｍｉｌｓｉｓｐａｒｔｉｃｕｌａｒｌｙｄｉｆｉｃｕｌｔｄｕｅｔｏｔｈｅｃｏｍｐｌｅｘｉｎｔｅｒａｃｔｉｏｎｓｂｅｔｗｅｎｗｏｒｋｒｏｌｓｈｉｆｔｉｎｇａｎｄｂｅｎ...

关键词： decoupled model gage and shape control cold rolling

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