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RESEARCH ON PROCESS AND PLAN OF DISASSEMBLY

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Chinese Journal of Mechanical Engineering 2001年第1期14卷 12-17页

作者： Hu Junjun Multimedia Research Division, Guangdong Telecommunication Academy of Science and Technology Li Chenggang Hu Yujin Cai Xueyuan Zhou Ji Huazhong University of Science and Technology 广东省电信科学技术研究院广东广州华中科技大学湖北

With the viewpoint of integrating all phases of product life cycle,product disassembly problem is discussed An kind of logical net methodology for product disassembly modeling is presented An channel of converting product assembly model into disassembly model,such as logical net, is proposed,and the minimization cost problem and its linear programming model are given

关键词： Life cycle Disassembly Logical net

STUDY ON THE VIBRATION CHARACTERISTIC OF THE METAL PUSHING BELT CONTINUOUSLY VARIABLE TRANSMISSION

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Chinese Journal of Mechanical Engineering 2001年第2期14卷 175-178,183页

作者： Yang Wei Qin Datong Li Yilong Zhu Caichao The State Key Laboratory of Mechanical Transmission,Chongqing University 重庆大学机械传动国家重点实验室重庆

The solid and finite element model of metal pushing type continuously variable transmission are established at speed ratio of i =0 5 and i=2 0. In order to solve the problem of the complicated of structure,the node node rod discrete finite element model is put forward and the whole system is simplified and *** natural frequency and mode shape of system are solved by iterative Lanczos reduce method for sensitivity analysis in finite element *** new method and the result can be used to improve the smoothness of the variable transmission system and to propose the theory for reducing noise at operation.

关键词： Continuously variable transmission Finite element model Modal analysis Vibration characteristic

USING LOGIC COMPONENTS FOR CONCEPTUAL DIE DESIGN

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Chinese Journal of Mechanical Engineering 2001年第2期14卷 151-155页

作者： Tang Dunbing Zheng Li Li Zhizhong Department of Precision Instruments and Mechanology,Qinghua University 清华大学精密仪器与机械学系北京

Logic components are used to support the conceptual design Taking the stamping die structure as the research object,several logic components are defined for the conceptual die construction design A new method logic assembly modeling is presented to satisfy the characteristic of the top down die design process Representing shapes and spatial relations in logic can provide a natural,intuitive method of developing complete computer systems for reasoning about die construction design at the conceptual stage This method can reflect the designer's thought clearly and provide the designer with a test bed for generating alternatives and performing reasoning work at the conceptual die design stage

关键词： CAD Conceptual design Die Logic component Logic assembly model

STUDY ON MECHANISM OF HYDRODYNAMIC OSCILLATION IN VORTEX PRECESSION METER USING LARGE EDDY SIMULATION

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Chinese Journal of Mechanical Engineering 2001年第1期14卷 9-11页

作者： Fu Xin Yang Huayong State Key Laboratory of Fluid Power Transmission and Control,Zhejiang University 浙江大学流体传动及控制国家重点实验室浙江杭州

In order to improve the anti jamming performance of a vortex precession meter, the disciplinarian of the vortex precession and the mechanism of hydrodynamic oscillation inside the vortex precession meter are numerically investigated by using the large eddy simulation The results show that the periodical eccentric motion of the vortexes initiates a hydrodynamic oscillation inside the vortex precession meter The visualized time dependent flow fields indicate that the pressures at axisymmetric points oscillate with a same intensity and frequency but 180° phase shift By using differential sensing technique,a new prototype of double sensor vortex precession meter,aimed to improve measurement accuracy, is developed

关键词： Flow measurement Vortex precession Hydrodynamic oscillation Flow visualization

MATLAB WEB SERVER AND ITS APPLICATION IN REMOTE COLLABORATIVE DESIGN OF MAGNETIC BEARING SYSTEMS

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Chinese Journal of Mechanical Engineering 2001年第2期14卷 179-183页

作者： Zhao Aiping Yu Lie Xie Youbai Theory of Lubrication and Bearing Institute,Xi’an Jiaotong University 西安交通大学润滑理论及轴承所陕西西安

Acclimatizing itself to the development of network,Math Works Inc constructed a MATLAB Web Server environment by dint of which one can browse the calculation and plots of MATLAB through Internet *** installation and use of the environment is introduced.A code established on the platform of MATLAB,which deals with the modal analysis of magnetic bearing system(MBS) supporting rotors of five degrees of freedom and considering the coupling of thrust bearing with radical bearings is modified to work in the *** purpose is to realize a remote call of the code by users through Internet for the performance analysis of the *** an application is very important to the concurrent design of MBS and for the utilization of distributive knowledge acquisition resources in collaborative *** work on modification and realization is described and the results are discussed.

关键词： MATLAB Web Server Remote call Magnetic bearing rotor system Concurrent design

DYNAMIC RESPONSE OF ROLLER GEAR INDEXING CAM SYSTEM CONSIDERING CLEARANCE AND MOTOR CHARACTERISTIC

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Chinese Journal of Mechanical Engineering 2001年第2期14卷 189-192页

作者： Chang Zongyu Civil Aviation College,Nanjing University of Aeronautics and Astronautics Zhang Ce Yang Yuhu Wang Yuxin Tianjin University 南京航空航天大学国内航空学院江苏南京天津大学天津

The dynamic responses of roller gear indexing cam mechanism are investigated .With applying Lagarange equation and Gear method,motion equations of this mechanism including clearance,motor characteristic,torsion flexibility are developed and *** results show that clearance affects primarily the response on turret,and has little effects on the responses on rotary *** the same time,the velocity fluctuation of motor shaft is not serious for the existence of inertia of reducer,and the high frequency of velocity fluctuation of camshaft is related with the torsion stiffness of shaft and the clearance between pairs.

关键词： Roller gear indexing cam mechanism Clearance Motor characteristic Dynamic response

COMPLEX NUMBER MODE APPROACH FOR REDUCING VIBRATION OF STRUCTURAL FLEXIBLE REDUNDANT ROBOT MANIPULATORS

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Chinese Journal of Mechanical Engineering 2001年第2期14卷 102-105页

作者： Wu Licheng Sun Zengqi Sun Fuchun Department of Computer Science and Technology, Qinghua University Lu Zhen Yu Shouqian Zheng Hong Beijing University of Aeronautics and Astronautics 清华大学计算机科学与工程系北京北京航空航天大学北京

A complex number mode analysis approach is proposed for vibration reducing of structural flexible redundant manipulators by utilizing self motion. In the proposed approach, the self motion is evaluated to nullify the modal exciting force of flexural motion, and the approach can be freely used when the degree of freedom of flexural motion is much greater than the available degree of reundancy. The availability and effectiveness of the proposed approach are demonstrated through numerical simulation with a four link spatial robotic manipulator possessing an end flexible link.

关键词： Redundant manipulators Self motion Vibration reducing Complex number mode analysis

Current status and prospects of hematopoietic stem cell transplantation in China

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Chinese Medical Journal 2022年第12期135卷 1394-1403页

作者： Xiaoqi Wang Ruihao Huang Xiaohui Zhang Xi Zhang Medical Center of Hematology Xinqiao HospitalState Key Laboratory of TraumaBurn and Combined InjuryArmy Medical UniversityChongqing 400037China Peking University People’s Hospital&Peking University Institute of Hematology National Clinical Research Center for Hematologic DiseaseBeijing Key Laboratory of Hematopoietic Stem Cell TransplantationBeijing 100044China

Hematopoietic stem cell transplantation(HSCT)is a highly effective and unique medical procedure for the treatment of most hematological *** first allogeneic transplantation was performed by *** Thomas in *** then,the field has evolved and expanded *** first successful allogenic HSCT(allo-HSCT)in China was conducted in *** the development of allo-HSCT in China lagged,China has since made considerable contributions to the process of HSCT worldwide,with more than 10,000 HSCTs performed *** particular,haploid HSCT(haplo-HSCT)technology represented in the Beijing Protocol has demonstrated similar efficacy to human leukocyte antigen-matched HSCT and has gradually become the pre-dominant choice for allo-HSCT in ***,the number of haplo-HSCT procedures exceeds 5000 per year,and the Beijing Protocol has been greatly improved by implementing updated individualized strategies for controlling complications,relapse,and infection *** addition,innovative haplo-HSCT technologies developed by different medical transplantation centers,such as Soochow,Zhejiang,Fujian,Chongqing,and Anhui,have emerged,providing inspiration for the refinement of global *** review will focus on the current activity in this field and highlight important trends that are vital in China’s allo-HSCT process,examining the current viewpoint and future directions.

关键词： Hematopoietic stem cell transplantation Haploidentical China

Domain-Oriented Data-Driven Data Mining Based on Rough Sets

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南昌工程学院学报 2006年第2期25卷 46-46页

作者： Guoyin Wang College of Computer Science and Technology Chongqing University of Posts and Telecommunications Chongqing 400065 China

Data mining (also known as Knowledge Discovery in Databases - KDD) is defined as the nontrivial extraction of implicit, previously unknown, and potentially useful information from data. The aims and objectives of data mining are to discover knowledge of interest to user *** mining is really a useful tool in many domains such as marketing, decision making, etc. However, some basic issues of data mining are ignored. What is data mining? What is the product of a data mining process? What are we doing in a data mining process? Is there any rule we should obey in a data mining process? In order to discover patterns and knowledge really interesting and actionable to the real world Zhang et al proposed a domain-driven human-machine-cooperated data mining *** and Yao proposed an interactive user-driven classification method using the granule network. In our work, we find that data mining is a kind of knowledge transforming process to transform knowledge from data format into symbol format. Thus, no new knowledge could be generated (born) in a data mining process. In a data mining process, knowledge is just transformed from data format, which is not understandable for human, into symbol format,which is understandable for human and easy to be *** is similar to the process of translating a book from Chinese into *** this translating process,the knowledge itself in the book should remain unchanged. What will be changed is the format of the knowledge only. That is, the knowledge in the English book should be kept the same as the knowledge in the Chinese ***, there must be some mistakes in the translating proces, that is, we are transforming knowledge from one format into another format while not producing new knowledge in a data mining process. The knowledge is originally stored in data (data is a representation format of knowledge). Unfortunately, we can not read, understand, or use it, since we can not understand data. With this understandi

关键词： Data mining data-driven user-driven domain-driven KDD Machine Learning Knowledge Acquisition rough sets