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坐标测量机的新发展——并联运动机构坐标测量机 总被引:12,自引:7,他引:5
从空间机构学的角度出发,可将坐标测量机分为串联机构坐标测量机和并联机坐标测量机两大类.由于并联机构坐标测量机测量精度高,测头位姿灵活,同时又具有“硬件”简单,“软件”复杂的特点,因而,正在成为坐标测量机领域研究的新热点.文章首先分析了普通笛卡尔串联机构坐标测量机的发展现状及存在问题,然后介绍了并联机构坐标测量机的结构及特点,并对国内外有关并联运动机构理论及其在坐标测量机领域的研究现状与发展趋势进行了综述,最后,对并联机构坐标测量机研究过程中应注意的主要问题进行了探讨. 相似文献
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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。 相似文献
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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。 相似文献
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关节臂坐标测量机是一种新型非正交系坐标测量设备,相比传统的三坐标测量机,具有体积小、重量轻、灵活、轻便等特点,现已在机械制造、电子、汽车和航空航天等领域得到应用,具有巨大的应用前景.在前期工作的基础上设计出一种六自由度关节臂坐标测量机,该关节臂坐标测量机关节零件采用航空铝合金材料、连杆采用碳纤维材料,因而具有强度高、重量轻的特点,内置式平衡机构可减轻操作者劳动强度,精密的关节角度传感器保证了测量机的高精度.基于Open CASCADE和VC++6.0平台开发了关节臂坐标测量机的测量软件和标定软件,并进行了整机的联机调试,验证了系统的可靠性. 相似文献
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Ibrahim A. Sultan Prajeesh Puthiyaveettil 《The International Journal of Advanced Manufacturing Technology》2012,63(1-4):201-207
A coordinate measuring machine (CMM) is meant to digitise the spatial locations of points and feed the resulting measurements to a CAD system for storing and processing. For reliable utilisation of a CMM, a calibration procedure is often undertaken to eliminate the inaccuracies which result from manufacturing, assembly and installation errors. In this paper, an Immersion digitizer coordinate measuring machine has been calibrated using an accurately manufactured master cuboid fixture. This CMM has been designed as an articulated manipulator to enhance its dexterity and versatility. As such, the calibration problem is tackled with the aid of a kinematic model similar to those employed for the analysis of serial robots. In addition, a stochastic-based optimisation technique is used to identify the parameters of the kinematic model in order for the accurate performance to be achieved. The experimental results demonstrate the effectiveness of this method, whereby the measuring accuracy has been improved considerably. 相似文献
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Prof. Morris R. Driels Lt W. Swayze USN Lt S. Potter USN 《The International Journal of Advanced Manufacturing Technology》1993,8(1):34-41
The work reported in this article addresses the kinematic calibration of a robot manipulator using a coordinate measuring machine (CMM) which is able to obtain the full pose of the end-effector. A kinematic model is developed for the manipulator, its relationship to the world coordinate frame and the tool. The derivation of the tool pose from experimental measurements is discussed, as is the identification methodology. A complete simulation of the experiment is performed, allowing the observation strategy to be defined. The experimental work is described together with the parameter identification and accuracy verification. The principal conclusion is that the method is able to calibrate the robot successfully, with a resulting accuracy approaching that of its repeatability. 相似文献
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The presented 3D-ball plate is used for testing machine tools with a workspace of 500 mm × 500 mm × 320 mm. The artefact consists of a 2D-ball plate which is either located by a kinematic correct coupling on a base plate or on a spacer. The spacers are placed between the base plate and the ball plate and are also kinematic coupled to the other elements of the artefact. The kinematic couplings provide a high repeatability of the measurement setup. Because of the specific application the known calibration procedures for 2D-ball plates are not applicable.A calibration method for the pseudo-3D-artefact on a coordinate measuring machine (CMM) is presented, with the aim to minimise the influence of geometric CMM errors. Therefore a computer simulation is used to analyse the effects of these disturbing errors on the calibration of the ball plate and the spacers. Using a reversal method, the plate is measured at four different horizontal positions after rotating the ball plate around its vertical axis. A couple of the CMM errors, e.g., a squareness error C0Y between the X- and Y-axis of the CMM, can be eliminated by that method—others have to be determined with additional measurements, e.g., the positioning errors EXX or EYY of the X- and Y-axis, respectively. The paper also contains a measurement uncertainty estimation for the calibration by use of experiments, tolerances and Monte Carlo-simulations. The achieved uncertainty for ball positions in the working volume is less than 2.1 μm (coverage factor k = 2). 相似文献
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Igor Alexeevich Shchurov 《The International Journal of Advanced Manufacturing Technology》2011,53(1-4):241-245
This paper presents a new calculation procedure of the virtual pitch thread diameter using the cloud of points from coordinate measuring machines (CMM). The procedure involves scanning of thread profiles using a CMM, calculation of points sets belonging to the left and right thread flanks, next determination of the thread profile which belongs to the adjoining helical surface. Its parameters guarantee the required diameter calculation. Estimation of this diameter comparing it with the standard one measured by CMM “Lapik KIM-1000” and the theoretical maximum pitch thread diameter shows that this approach gives a reliable result. 相似文献