KNT-ESR3机器人运动学建模与仿真研究

以KNT-ESR3机器人为研究对象,采用D-H参数法,利用Matlab机器人工具箱Robotics Toolbox建立机器人运动学模型,进行运动学分析与逆运动学求解,实现了机器人空间轨迹规划及其仿真.结果表明,计算与仿真验证了机器人运动学模型建立的正确性,依据该模型能够有效地生成运动轨迹并分析机器人各关节的运动参数,为开展该机器人的研发工作做了理论铺垫.     

自由漂浮空间机器人动力学建模与仿真研究

空间机器人相比固定基座机器人,增加了6个自由度,且空间机器人的机械臂与基座之间存在动力学耦合问题。因此,其动力学建模较为复杂。针对自由漂浮空间机器人系统进行了运动学和动力学方程的推导,给出了动力学方程求解的详细算法,并采用Spacedyn工具箱对动力学模型进行了数值仿真。仿真结果表明建立的动力学模型可方便的进行自由漂浮空间机器人的运动分析。     

一种双机协同作业机器人的协作工作空间分析

以一种双机协同作业机器人为研究对象,建立双机协同作业机器人运动学模型,并对其进行工作空间求解与仿真分析,判断是否满足工作要求。首先采用D-H法对双机协同作业机器人坐标系进行建立,通过分析其各个关节之间的空间位姿矩阵变换关系,进行运动学方程求解,然后基于蒙特卡罗法对双机协同作业机器人的协作工作空间进行求解,并进行仿真实验验证。最后对协作工作空间的影响因素进行分析,为下一步对协作工作空间进行优化以及双机协作机器人的轨迹规划等问题提供了理论依据。     

2DOF空间3-RPS并联机器人位置运动学混合算法

空间2自由度并联机构可用于高作用力下精确控制姿态的两个分量的工作场合.建立了2自由度3-RPS并联机器人的位置运动学约束方程;对其正逆运动学算法进行了讨论.对求解并联机器人位置正解的杆长搜索法进行了改进,并结合解非线性方程组的拟牛顿法,提出了一种能解决方程组多解并且计算精度较高的混合算法,推导了2自由度3-RPS并联机器人位置反解的求解过程.通过实例验证了算法的正确性和所能达到的精度.     

通用型六自由度工业机器人的运动学分析

针对六自由度工业机器人运动学分析和轨迹规划过程中的计算烦琐问题,以通用型六自由度工业机器人为研究对象,在Matlab环境下,利用Robotics Toolbox工具箱对该机器人进行运动学建模,并建立该机器人的D-H模型,对其进行运动学求解和轨迹规划与仿真。实验表明,Robotics Toolbox工具箱极大地简化了通用型六自由度工业机器人运动学分析的正、逆解的求解过程,并且能直观地显示机器人的运动特性、参数和轨迹。对通用型这类六自由度工业机器人的研究与应用具有重要的价值。     

一种新型欠驱动型并联机器人的运动学分析与仿真

传统并联机器人具有自由度数量与驱动电机数量相等的问题,效率低下。为解决这些问题,提出了一种基于传统并联机器人的新型欠驱动型并联机器人。分析了欠驱动型并联机器人的结构特点与工作原理,应用空间解析几何与向量代数法,推导了机器人的运动学正解与反解。建立了运动学模型,应用MATLAB验证了运动学正解与反解的正确性,确立了最优工作空间。仿真结果表明,驱动电机数量为3时实现了机器人3或4自由度切换的功能,提高了机器人的抓取效率,具有工作空间大、运行速度快、定位精度高、制造成本低等特点,具有广泛的工业应用前景。     

基于虚拟样机的电动六自由度并联机器人结构参数设计

针对并联机器人在设计过程中的约束变量多、干涉情况复杂和设计周期长等问题,进行电动六自由度并联机器人结构参数设计与仿真的研究.以Stewart并联机器人为例,对并联机器人工作空间的两种求解方法进行了分析.首先利用几何法求解出其工作空间,然后提出一种基于虚拟样机技术求解其工作空间与承载能力的方法.这种方法利用Pro/E软件进行三维设计,将三维造型导入Adams软件中进行动态仿真.仿真结果表明,该方法在保证仿真结果可靠性的前提下,可避免烦琐的计算,缩短设计周期.     

柑橘采摘机器人结构设计及运动学算法

针对柑橘树冠较高,果梗木质化程度高、短且坚硬的特点,设计了新颖的柑橘采摘机器人手臂和末端执行器.根据其工作特征给出了能够提高运算速度的约束条件,并运用D-H法建立了机器人坐标变换矩阵,分别给出了机器人运动学正解和逆解.仿真和试验结果表明了机器人结构设计及运动学算法的合理性、有效性.机器人臂展1 048 mm、工作空间1...     

七自由度球头开孔机器人结构优化研究

为解决某装备球头开孔作业存在的问题,提出了一套七自由度串联开孔机器人设备方案,根据其D-H运动学模型进行运动学分析并检验了机器人的工作空间.根据机器人的静刚度、速度以及最大工作空间距离指标,构建了机器人的多目标尺寸优化模型;利用少控制参数的多目标粒子群优化算法对模型进行求解.最终结果表明,在取前臂尺寸为0.958m,后臂尺寸为0.965m时,相较于尺寸优化前,机器人的静刚度全域指标提升了60.05%,速度综合全域指标提高了3.1%,最大工作空间距离指标增加了6.4%.     

4自由度上肢康复外骨骼机器人设计与分析

针对现如今上肢康复外骨骼机器人外部结构以及运动问题，利用Solidworks设计出一种4自由度可穿戴上肢康复机器人，基于人体上肢生物力学结构，使其关节和链接与人体的关节和链接相互对应，根据此基础设计出人体上肢运动学模型，使用D-H法分析了外骨骼机构的运动学关系，得到坐标转换矩阵，通过Matlab机器人工具箱进行运动学分析以及工作空间仿真模拟，进一步验证了运动学分析的可性。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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