微装配机器人系统研究与实现

提出了一种基于显微视觉伺服和多机械手协同操作的微装配机器人系统,该系统由微操作机械手、显微视觉和微夹持器3部分构成.介绍了系统总体结构、三机械手协同操作微装配平台、双光路立体显微视觉、2种不同类型的微夹持器装置,以及面向微装配机器人的TSB分级智能控制方法.装配实验表明:该系统能实现对亚毫米零件的精密装配.     

宏微结合的12自由度微装配系统精度分析

为了提高分立式宏微结合的12自由度微装配系统的整体位姿运动控制精度,提出误差矢量坐标变换合成法,建立了微装配系统基于刚体假设的误差传递模型,推导了装配零件与装配基体零件的位姿误差计算公式,提出了姿态误差灵敏度分析计算方法,根据分析结果采用微位姿检测装置测量获得了系统补偿向量,使微装配系统整体位姿运动控制精度提高至微米级.     

力／位置混合控制的新型机器人装配系统

介绍了新研制的一种适用于一般销孔零件装置的机器人末端微操作器。该操作器具有力觉功能和５自由度，采用主被动混合方式，与ＰＵＭＡ５６２机器人组成宏－微操作系统，可由一台ＩＢＭ－ＰＣ机控制，成功地完成零件配作业，并能对不同的装配策略的方案进行实验评价。     

两指并联微操作手的动力学建模及仿真分析

设计一种由直线超声电机驱动的两指并联微操作手,建立其刚柔耦合动力学模型,并进行仿真分析.采用分支结构建模法,将微操作手分为1个圆盘手指子系统和3个对称的运动链子系统,分别推导其动能和势能,利用拉格朗日方程对微操作手进行动力学建模.构建微操作手的刚柔耦合仿真模型,由反向和向前动力学仿真计算得到电机输入和手指操作末端的位移...     

主／从式遥控作业机械手的计算机控制研究

介绍了一个自行研制的主／从式遥控作业机械手的两级计算机控制系统，上位机采集主动操作手和控制面板信息，下位机实现从动操作手的液压伺服控制，两者之间采用半双工串行通讯，其距离可达２ｋｍ．与国外同类系统的区别在于，本系统采用的是ＳＴＤ工业总线，软件上还增加了示教／再现与空间直线，圆弧的插值功能，海上试验表明，该系统有良好的操作性能与完善的作业功能。     

可重构12自由度微装配技术及其实现

研究可重构微装配技术及功能构成. 以精密微小型机械系统为装配对象,提出了可重构12自由度微装配技术和实现方法,具体包括6自由度宏动机器人、6自由度精密微动工作台、集成微力检测与反馈的组合式微夹持器和位姿检测装置等可重构模块. 研究并开发出可重构12自由度微装配系统,根据系统所测得的位姿数据信息和夹持数据信息成功实现了微小型轴和齿轮孔的装配. 可重构12自由度微装配技术为实现精密微小型机械系统的装配提供了一种新的思路和方法.     

基于机器视觉的零件自动装配系统

针对工业装配生产线的削刀架自动装配问题，基于机器视觉技术，构建了一套在线机器视觉系统．采用特征值方法识别零件，并通过质心法结合特征点及最小二阶矩进行定位．利用带有透镜径向一阶畸变的小孔摄像机模型，采用径向排列约束（RAC）2步标定法对摄像机进行了标定，并在线验证．实验结果表明，该方法可获得很好的识别效果，识别零件正确率100％，系统工作时间约300ms，满足装配作业的实时性和精度要求．     

基于模糊PD控制的微操作机械手真空微夹研究

由于重力和粘附力的变化,宏观工具不再适用于对微粒的操作．采用真空方式对微粒进行操作是一种较为理想的策略．设计了一种用于微粒(直径100～300μm)装配的真空微夹工具．设计了微夹的一种以A-Duc812为底层控制器和以PC机为顶层控制器的两级控制结构．对微粒的粘附力影响和受力情况进行了分析,推导了微夹不同作业阶段的工作压力条件．考虑空气的可压缩性、气动元件的非线性和微夹的压力损失,为提高微夹的拾取和释放微粒的能力,设计了基于模糊PD的压力控制器．Matlab仿真试验结果表明该控制器的有效性．微夹具有性能稳定可靠、结构紧凑的优点,能较好地适用于面向亚毫米级微粒的装配作业．     

微装配系统中精密定位装置的研制

介绍了一种微型装配系统中的精密定位装置，该系统利用了外形尺寸为2mm的电磁型微电动机制作了 5mm×6mm的微型机器人小车作为粗定位的执行器和装配机器人；利用压电晶体的压电、电致伸缩特性实现了 微工作台的精密定位．系统还利用了图像采集系统来实现位置反馈和实时系统状态显示和控制，微型定位装置的 研制使构造真正的微型装配系统成为可能．     

主／从式遥控作业机械手的计算机控制研究

介绍了一个自行研制的主／从式遥控作业机械手的两级计算机控制系统，上位机采集主动操作手和控制面板信息，下位机实现从动操作手的液压伺服控制，两者之间采用半双工串行通讯，其距离可达２ｋｍ。与国外同类系统的区别在于，本系统采用的是ＳＴＤ工业总线，软件上还增加了示教／再现与空间直线、圆弧的插值功能。海上试验表明，该系统有良好的操作性能与完善的作业功能。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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