五自由度仿人灵巧手运动学研究

为了深入掌握灵巧手运动过程,需要对灵巧手各关节的位移、速度、加速度、静力进行研究,得到运动学相关的理论数据。在分析了Shadow仿人灵巧手的机械结构特点的基础上,运用D-H坐标法,建立Shadow仿人灵巧手的运动学模型,推导出运动学正、逆方程,求解出正、逆解析解和雅可比矩阵,分析了灵巧手的微分运动学,求解出雅克比矩阵,并且得到了静力学相关参数,为下一步的理论研究和仿真实验提供数据参考。     

四自由度模块化移动机械臂建模与运动学分析

为了对模块化移动机械臂的模块化组成和控制系统建模,对受非完整约束的差分驱动的移动平台运动学模型进行了分析。并在考虑机械臂运动学约束的基础上,采用Denavit-Hartenberg法描述了四自由度模块化机械臂操作空间,获得以关节角度为变量的正运动学模型。运用矩阵逆乘的解析法,进一步得到了机械臂逆运动学的完整解析解。最后,在实验室平台MT-ARM上做了仿真与实验验证,结果证明了正运动学模型及运动学逆解的正确性。     

装配机器人的运动学分析与仿真

文中对装配机器人进行运动学分析,并采用D-H方法获得了运动学正解、运动学逆解,为机器人运动学轨迹规划打下基础。使用MATLAB获得工作空间,利用逆解并根据运动过程的要求,对装配机器人进行了轨迹规划。将MATLAB中规划轨迹的结果在ADAMS中进行了虚拟仿真,获得的实验数据为装配机器人运动过程的研究和结构优化提供理论依据。     

基于MATLAB的机器人正运动学分析与仿真

鉴于机器人技术的迅猛发展,不同用途的机器人活跃在各个领域.研究机器人,运动学分析是关键,包括运动学方程的正解和逆解.本文应用坐标系变换对机器人进行建模分析,计算出机器人运动方程的正解求解公式,得到了关节末端坐标与各个关节角之间的对应关系.并应用Matlab—Simulink下的SimMechanics仿真模块进行机器人的运动学三维仿真,验证仿真模型,为今后机器人运动学方面的研究提供一个直观有效的环境.     

四自由度模块化机械臂运动学建模

首先根据四自由度(MT-R)模块化机械臂的结构特点和运动学约束,利用D-H算法对机械臂进行表示和建模,得到了以关节角度为变量的正运动学模型。利用矩阵逆乘的解析法求解机械臂逆运动学的完整解析解;最后通过仿真和实验验证了正运动学模型及运动学逆解的正确性。验证结果为机械臂末端执行器的精确定位和轨迹规划提供了理论依据。     

基于六自由度机械臂运动学问题的仿真研究

以六自由度工业机器人--MOTOMAN-HP6机器人为研究对象,简单介绍了机器人运动学的数学基础。根据机器人的相关参数,建立了机器人运动学模型及相关坐标系,对机器人的正运动学及逆运动学问题进行了研究。采用MATLAB 开发工具建立系统界面,编制了相关程序,结合实例对机器人的直线、圆弧及自由曲线轨迹的生成进行了仿真,完成了系统设计。为后续实习用工业机器人离线编程系统的开发打下了基础。     

基于MATLAB Robotics TOOIs的机械臂仿真

在MATLAB环境下,对puma560机器人进行运动学仿真研究,利用Robotics Toolbox工具箱编制了简单的程序语句,建立机器人运动学模型,与可视化图形界面,利用D-H参数法对机器人的正运动学、逆运动学进行了仿真,通过仿真,很直观的显示了机器人的运动特性,达到了预定的目标,对机器人的研究与开发具有较高的利用价值。     

基于MATLAB Robotics Tools的机械臂仿真

在MATLAB环境下,对puma560机器人进行运动学仿真研究,利用Robotics Toolbox工具箱编制了简单的程序语句,建立机器人运动学模型,与可视化图形界面,利用D-H参数法对机器人的正运动学、逆运动学进行了仿真,通过仿真,很直观的显示了机器人的运动特性,达到了预定的目标,对机器人的研究与开发具有较高的利用价值。     

改进适应度函数的CMA-ES算法在机器人逆运动学中的应用

针对机器人的逆运动学多解问题,本文利用"最佳柔顺性"规则,对适应度函数进行改进,提出了一种自适应协方差矩阵进化策略(CMA-ES)算法求逆运动学解的新方法.在原算法的基础上,将机器人各关节运动范围作为约束条件,在工作空间中获得唯一且平稳光滑的路径.以REBot-V-6R-6500型6自由度机器人为研究算例,结果表明:在...     

多指灵巧手关节空间的轨迹规划研究

为确保灵巧手能在规定的时间内完成既定的任务,并要求抓取的动作满足连续、平滑等要求。可以利用抛物线连接的线性函数插值法对其进行轨迹规划。并讨论如何根据给定的路径点规划出的运动轨迹参数,实时地产生运动轨迹。     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.