基于UG的串并联机构坐标测量机虚拟样机设计与仿真

针对一种串并联机构坐标测量机进行机构分析,进而基于UG建立测量机虚拟样机,在UG下实现了坐标测量机的运动仿真,得到了测量机精确的运动数据及工作空间。     

串并联坐标测量机虚拟样机仿真验证的研究

将在UG中创建的串并联坐标测量机虚拟样机导入动力学仿真软件ADAMS中,用编译运行过程函数的方法,对用数学方法推导的测量机运动学解析解进行了仿真验证,证明该解析解表达式推导正确.该方法为机器人运动学分析提供了新思路.     

串并联坐标测量机虚拟样机仿真验证的研究

将在UG中创建的串并联坐标测量机虚拟样机导入动力学仿真软件ADAMS中,用编译运行过程函数的方法,对用数学方法推导的测量机运动学解析解进行了仿真验证,证明该解析解表达式推导正确。该方法为机器人运动学分析提供了新思路。     

新型并联机器人坐标测量机仿真建模的实现

为了验证新型5自由度并联机器人坐标测量机的设计方案和理论模型,缩短开发周期,降低开发费用,提高一次性设计成功率,将虚拟样机技术应用于该并联机器人坐标测量机的设计开发过程。利用SolidWorks软件建立该型并联坐标测量机的虚拟样机模型,应用OLE接口技术实现了该型并联坐标测量机的运动仿真和测量仿真,采用ADAMS软件实现了该型并联坐标测量机的动力学分析和仿真,并给出了仿真建模过程中关键问题的解决方案。计算机仿真结果证实了理论模型的正确性,验证了设计的合理性和可靠性。为此新型并联机器人坐标测量机的结构设计和数控系统设计提供了主要参数和理论依据,为并联坐标测量机的工程设计提供了一套有效的分析方法。     

三自由度并联机构坐标测量机及其虚拟原型研究

介绍三自由度并联机构坐标测量机的结构、特点及工作原理,建立了该坐标测量机的测量模型,讨论了测量空间的计算方法,并对计算机仿真结果进行了分析,在Ｗｉｎｄｏｗｓ９５开发环境下,通过ＶｉｕａｌＣ＾＋＋５．０调用ＯｐｅｎＧＬ图形库中的函数,对并联坐标测量机的虚拟原型进行了参数化三维建模与仿真,从而为真实样机的制作尊定了基础     

并联六坐标测量机的虚拟样机

并联坐标测量机是一种新类型的坐标测量机，它模拟多足生物的运动形式。由于运动的复杂性，只凭计算数据很难直观、准确地判断测头的位置和姿态，必须通过虚拟样机模拟并联坐标测量机的作业过程。在Windows2000环境下，通过VC 调用OpenGL函数，对测量机的各部分零件进行实体造型，并按照零件间的装配关系进行实体装配，获得坐标测量机的三维仿真图，再与运动学位置分析的正解模型和反解模型相结合，开发出能实时运动的三维并联六坐标测量机的虚拟样机，实现高效率、低成本的仿真作业。经测试证明，该系统运行可靠，效果逼真，为研制真实样机提供了手段。     

并联坐标测量机理论模型及其虚拟原型研究

首先介绍了一种三自由度关联机构坐标测量机的结构、特点及工作原理,然后建立了该坐标测量机的测量模型,最后,在Windows98开发环境下,通过VC++6.0调用OpenGL图形库中的图形函数,对该坐标测量机的虚拟原型进行了参数化三维建模与仿真,从而为真实样机的制作奠定了基础。     

应用CMM实现非接触视觉测量的改造

针对光学坐标测量机售价昂贵，难以在国内厂家普及的实际情况，结合立体视觉测量非接触快速测量的坐标测量机可在大范围内准确运动的优点，应用立体视觉测量技术对后者进行了改造，可在一定精度范围内替代光学坐标测量机，此外，还通过试验对其测量精度进行了验证。     

一种新颖并联运动坐标测量机的误差建模与仿真

给出了三自由度并联运动坐标测量机的运动学模型，依据全微分理论，导出测头位置误差与各运动副误差及移动副运动误差之间的相互关系，建立了该坐标测量机的误差模型。用计算机对所建误差模型进行了仿真，讨论了机构参数误差对测量结果的影响，为运动校正和控制奠定了基础。     

虚拟坐标测量机构成和实现方法

三坐标测量机以精密机械为基础,综合应用了光学、电子、计算机等先进技术,使其成为一种先进精密的测试仪器。本文简要地介绍了传统三坐标测量机发展的现状,结合虚拟现实技术,提出了三坐标测量机的一个新的发展方向--虚拟坐标测量机(VCMM),同时阐述了虚拟坐标测量机的概念、组成和实现方法,并说明了活动桥式虚拟坐标测量机的运行环境。     

Training in coordinate measurement using 3D virtual instruments

Coordinate metrology is a subject that has evolved driven by two important vectors: hardware and software development. At present, most 3D measuring software offer features for offline programming of the Coordinate Measuring Machines (CMM). A few software solutions enable the simulation of both the CMM and other elements involved in the measuring process, such as the human operator or an automated system for loading and unloading the measured parts. The paper presents the features and advantages offered by Delmia V5 for simulating a complete measuring environment encompassing: the CMM, the human operator, a robot or automated system for manipulating the parts. The simulations developed represent a powerful learning tool that can complement existing models for CMM training.     

新型虚拟轴三维坐标测量机构3-RRC的运动分析

简要介绍了坐标测量机的发展动态及新型虚拟轴三维坐标测量机构3—RRC的测量原理，并用运动影响系数法对其进行了运动分析，为测量机的运动性能评价提供了理论依据。借助于ADAMS软件进行动态仿真，检验了理论推导的正确性，提供了机构的运动学特性曲线。     

基于Pro/E的串并联机器人的逆向运动学仿真

在Pro/E中完成串并联机器人的三维建模,巧用Pro/E中测量结果输出的图表文件,利用反加驱动的方法建立运动仿真,然后巧妙创建坐标系,通过测量得到实际驱动电动机的运动规律。     

Surface probing simulator for the evaluation of CMM probe radius correction software

Scanning coordinate metrology is largely based on recording the position of a spherical tip which is maintained in contact with the surface to be measured. The coordinate measuring machine (CMM) software converts these tip coordinates into coordinates of points on the measured surface, a process called probe radius correction. In order to investigate the probe radius correction accuracy of specific CMM software in scanning measurements, a surface probing simulator is developed. It calculates the coordinates of probe tip center points (virtual indicated measured points) as raw measurement data by numerically probing a known virtual surface. An iterative solution based on geometric criteria is used to achieve the necessary tangential contact conditions. Various sculptured surface profiles, probe radii, and scanning increments can then be simulated. These raw data are then fed to the CMM software where the probe radius correction is performed. The CMM results are then compared with the known surface to evaluate the probe radius correction accuracy of the CMM built-in algorithm. The simulator allows a rapid CMM software capability check for a variety of situations and may pinpoint shortfalls that may be avoided through alternative measurement procedures. It may also be used to motivate the development of new probe radius correction techniques and assist in their evaluation. Tests were conducted on a Zeiss and a Mitutoyo CMM to demonstrate the usefulness of the simulator.     

Practical way to measure large-scale 2D parts using repositioning on coordinate-measuring machines

In many situations it is required to perform an inspection of large flat parts on a coordinate-measuring machine (CMM) when it is impossible to probe all necessary surfaces from one position of the part. Or it is necessary to measure a large part which dimensions exceed the volume of an available CMM. For this purpose one needs to merge the data measured in two different positions of the workpiece into one coordinate system. Though most of geodesic software has out-of-the-box functionality to do that, a lot of popular CMM software lacks it. In this paper a practical approach is described to bring a repositioning functionality into a CMM software. The Calypso metrology software was studied. The proposed inspection method can be used both for the measurements of linear dimensions and location tolerances as common practice in Calypso.     

Experimental evaluation of software estimates of task specific measurement uncertainty for CMMs

Estimation of the uncertainty of Coordinate Measuring Machine (CMM) measurements for real, imperfect parts is a very complex undertaking. Not only are there many contributors to the uncertainty that may interact in a non-linear fashion, making it difficult to mathematically determine an uncertainty estimate, but it is also difficult to predict the long-term variation of these parameters. Our work seeks to provide experimental validation of the uncertainties predicted by two different commercial software packages that purport to predict the task-specific measuring uncertainty of CMM measurement results. The validation procedure uses repeated measurements of calibrated artifacts to experimentally determine measurement uncertainties. These measurements can then be simulated in the commercial software packages. The comparison will allow the software to be tested to see if it appropriately accounts for the influences of the operator, environment, and part placement. This paper reports the results of actual part measurements and the predicted uncertainty provided by commercial simulation packages. Differences between experimental and simulated uncertainties are highlighted, and their causes examined.     

复杂型面板料件冲压仿真有限元建模技术研究

探讨了具有复杂型面的大型板料件冲压仿真有限元建模过程中的一些关键技术问题。针对此类零件具有几何形状复杂的特点 ,利用造型功能强大的三维造型软件对由扫描测量机测到的离散数据进行拟合和光顺处理 ,得到零件的精确曲面 CAD模型 ,然后通过标准数据转换接口 ,将 CAD模型转入仿真软件的前处理器中 ,再利用软件的曲面网格划分功能对其进行网格划分 ,最终建立起冲压仿真所需的有限元模型。以轿车门内板冲压仿真有限元模型建模为例 ,说明了复杂型面板料件冲压仿真有限元建模技术的实际应用。     

基于矢量相似淘汰算法的CMM测量路径规划及仿真检验

在分析现有三坐标测量机(CMM)测量路径算法的基础上,提出一种基于已知CAD模型和矢量相似淘汰算法的CMM测量路径规划方法。该算法根据测量邻近点之间的曲率变化关系,优化选择测量点,生成测量路径和DMIS程序。同时,建立了DMIS程序仿真检验平台。试验证明,经过仿真检验平台检验调试的DMIS程序可直接运用于CMM测量,并可取得良好的测量效果,大大提高了三坐标测量的效率和精度。