机器人操作机弹性动力学分析新方法

本文给出将机器人操作机划分成传动系统，刚性化杆件和弹性杆件３种不同类型的子结构，按相邻子结构间位移协调矩阵组装出操作机系统的弹性动力学方程进行ＫＥＤ仿真分析的新方法。实例分析表明：该方法计算量小、考虑因素多。为操作机设计提供了一种有效的仿真分析手段。     

负载与操作机分开的机器人动力学算法

基于Kane动力学方程,导出了负载与操作机分开,并具有封闭形式的机器人动力学通用算法。该法适用于开、闭链机构的机器人动力学研究;便于用计算机推导机器人操作机的动力学数一符方程。给出了该算法及其证明,并讨论了该算法的性质及特点。     

TF-1型弧焊机器人的运动学建模研究

对机器人操作机进行运动学建模是机器人控制和运动规划的必要前提。利用TF-1型弧焊机器人的结构特点,运用一种新的求取逆解的方法,得出了该机器人运动学正、逆解析解。该方法避免了大量的逆矩阵相乘,简化了求取运动学逆解的过程,而且所得的解表达式简单,便于机器人的仿真和快速准确控制。仿真结果证明了该方法的有效性。     

基于VR的冗余度机器人轨迹规划及仿真系统

研究了茯于VR的冗余度机器人轨迹规划仿真系统技术,首先讨论了面向机器人的VR系统的基本构成,其次研究了冗余度机器人机械手的VR建模技术,分析了虚拟模型的轨迹规划算法,最后进行了基于VR的冗余度机器人操作机轨迹规划的仿真研究。     

单链开环结构操作机的特殊位形

机器人机构的奇异性分析是机器人运动学研究的重点，该文着重研究单链开环机构操作机在有限制转动或移动在节时的位置奇异曲面的求解问题。首先借助于螺旋理论给出操作机末端位置奇异时必须满足的条件，以此作为机构工作空间中奇异曲面参数的选择依据，并提出了各关节变量求取的递推算法，开发了求解实际操作机奇异曲面的通用软件。     

6-PSS并联机器人操作机行程解析综合

定义了６－ＰＳＳ并联机器人操作机的工作空间；以微分几何的工具，构造出在主动关节变量约束下工作空间边界的数学模型，提出一种综合操作机主动关节变量变化范围的解析方法；讨论了尺度参数对主动关节变量变化范围的影响规律。     

基于焊接机器人的自动化控制系统的设计

焊接机器人是一种专门从事焊接的工业机器人,是可编程的自动化控制操作机,由于其特殊的用途,降低了对工人技术的要求等特点,广泛应用于汽车焊接及其零部件生产中。控制系统是机器人极其重要的组成部分,通过对硬件、软件的研究与设计,构建了焊接机器人控制系统,通过测试与试运行,完全符合特定产品工业生产的需要。     

机器人柔性操作机弹性动力学方程

本文将机器人柔性操作机主体机构的构件视为质量连续分布的弹性体，首次根据弹性体振动理论求解机构各位姿的固有频率和主振型并建立了机构弹性动力学方程．     

一种移动机器人系统的运动学解法

把行走机构与安装于其上的操作机作了一个整体来考虑,从末端执行器的作业要求出发,研究了机器人运动参数解的存在性条件,并提出运动参数的一种解法。     

机器人柔性操作机弹性动力学方程

本文将机器人柔性操作机主体机构的构件现象为质量连续分布的弹性体，首次根据弹性体振动理论求解机构各位姿的固有频率和主振型并建立了机构弹性动力学方程。     

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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