The Experts below are selected from a list of 11052 Experts worldwide ranked by ideXlab platform

Liandong Yu - One of the best experts on this subject based on the ideXlab platform.

  • A Kinematic Model for Parallel-Joint Coordinate Measuring Machine
    Journal of Mechanisms and Robotics, 2013
    Co-Authors: Jie Li, Liandong Yu
    Abstract:

    The typical nonorthogonal Coordinate Measuring Machine is the portable Coordinate Measuring Machine (PCMM), which is widely applied in manufacturing. In order to improve the measurement accuracy of PCMM, structural designing, data processing, mathematical modeling, and identification of parameters of PCMM, which are essential for the measurement accuracy, should be taken into account during the Machine development. In this paper, a kind of PCMM used for detecting the crucial dimension of automobile chassis has been studied and calibrated. The Denavit–Hartenberg (D–H) kinematic modeling method has often been used for modeling traditional robot, but the D–H error representation is ill-conditioned when it is applied to represent parallel joints. A modified four-parameter model combined with D–H model is put forward for this PCMM. Based on the kinematic model, Gauss–Newton method is applied for calibrating the kinematic parameters. The experimental results indicate the improvement of Measuring accuracy and the effectiveness of the PCMM based on the proposed method.

  • design of the data processing system for parallel dual joint Coordinate Measuring Machine
    Fourth International Seminar on Modern Cutting and Measurement Engineering, 2010
    Co-Authors: Tao Wang, Liandong Yu
    Abstract:

    This paper introduces a data processing system for the three-dimensional information of double parallel-joint Coordinate Measuring Machine (PD-CMM).The intelligent sensor units, which consisted of angle sensors, temperature sensors, microcontroller, are set in each joint and arm. The data are mainly the grating's output signal of each joint and the temperature change of each arm. The system samples and processes the data, then communicates with the host computer through USB interface. The simulation and experiments show that the data processing system works well.

  • Parameter Identification of Double Parallel Joints Coordinate Measuring Machine
    Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 2010
    Co-Authors: Teng Ye, Junrui Li, Wentao Cheng, Liandong Yu
    Abstract:

    ABSTRACT Double Parallel Joints Coordinate Measuring Machine (CMM) is a new type Coordinate Measuring device with 9 structural parameters with accuracy difficult to be ensured just by processing and assembly. Calibration is needed to identify the structural parameters of the Measuring Machine. This article describes the calibration process of such a Double Parallel Joints CMM, and simulation was employed to analyze how the number of samples and angle measurement accuracy influence the measurement precision and calibration result during calibrating process. The conclusions are very instructive to precision design or error allocation and calibration process of the Double Parallel Joints CMM. Key words o CMM, Double Parallel Joints, Parameter Identification, Simulation INTRODUCTION The focus of CMM research is on orthogonal Coordinate Measuring system with over 40 years development. Conventional CMMs have a very wide range of applications for its wide measurement range, high accuracy, connecting with flexible manufacturing systems and computer integrated manufacturing system. With the maturity of CMM and the requirements of large-scale engineering measurement, increasing studies on non-orthogonal CMM were carried out. Though Articulated Arm Coordinate Measuring Machine (AACMM) involving kinematic model, error model and structural parameters identify or calibration and so on has been studied in many domestic colleges, the accuracy of AACMM is limited because of its structur e and exorbitant expense on six high precision angle Measuring system. W. Lotze proposed a novel low-cost CMM named ScanMax

James H Burge - One of the best experts on this subject based on the ideXlab platform.

  • swing arm optical Coordinate Measuring Machine high precision Measuring ground aspheric surfaces using a laser triangulation probe
    Optical Engineering, 2012
    Co-Authors: Yuhao Wang, Robert E Parks, James H Burge
    Abstract:

    The swing arm optical Coordinate-Measuring Machine (SOC), a profilometer with a distance Measuring interferometric sensor for in situ measurement of the topography of aspheric surfaces, has shown a precision rivaling the full aperture interferometric test. To further increase optical manufacturing efficiency, we enhance the SOC with an optical laser triangulation sensor for Measuring test surfaces in their ground state before polishing. The calibrated sensor has good linearity and is insensitive to the angular variations of the surfaces under testing. Sensor working parameters such as sensor tip location, projection beam angle, and measurement direction are calibrated and incorporated in the SOC data reduction software to relate the sensor readout with the test surface sag. Experimental results show that the SOC with the triangulation sensor can measure aspheric ground surfaces with an accuracy of 100 nm rms or better.

  • swing arm optical Coordinate Measuring Machine modal estimation of systematic errors from dual probe shear measurements
    Optical Engineering, 2012
    Co-Authors: Robert E Parks, Yuhao Wang, James H Burge
    Abstract:

    The swing-arm optical Coordinate Measuring Machine (SOC), a profilometer with a distance-Measuring interferometric probe for in situ measurement of the topography of aspheric surfaces,has been used for Measuring highly aspheric mirrors with a performance rivaling full aperture interferometric tests. Recently, we implemented a dual probe, self-calibration mode for the SOC. Data from the dual probes can be used to calibrate the swing-arm air bearing errors since both probes see the same bearing errors while Measuring different portions of the test surface. Bearing errors are reconstructed from modal estimation of the sheared signal.

Janko Hodolic - One of the best experts on this subject based on the ideXlab platform.

  • different approaches in uncertainty evaluation for measurement of complex surfaces using Coordinate Measuring Machine
    Measurement Science Review, 2015
    Co-Authors: Igor Vrba, Rudolf Palencar, Miodrag Hadzistevic, Branko Strbac, Vesna Spasicjokic, Janko Hodolic
    Abstract:

    This paper describes a methodology for uncertainty assessment for Coordinate Measuring Machine measurement of complex real work pieces from industry. The study applied two approaches (in scanning mode only) for estimating the measurement uncertainty with the support of Taguchi plan in the experiment containing five factors: scanning speed, sample density, probe configuration, scanning direction, and position of Measuring object. In the first approach the uncertainty was estimated by Measuring the basic geometric objects (primitives like sphere and torus) representing the decomposition of complex surfaces and in the second one a complex surface was treated as an unknown quantity. Calculated uncertainty Type A for both measurement tasks was in the range from 0.65 µm to 6.47 µm. Evaluation of the uncertainty Type B covered specifications of the Machine and standard uncertainties derived from temperature effects. Total uB component was found to be in order of 0.4 µm. Future research will be directed towards the development and application of simulation methods

Tomizo Kurosawa - One of the best experts on this subject based on the ideXlab platform.

  • geometric calibration of a Coordinate Measuring Machine using a laser tracking system
    Measurement Science and Technology, 2005
    Co-Authors: Kenta Umetsu, Toshiyuki Takatsuji, Ryosyu Furutnani, Sonko Osawa, Tomizo Kurosawa
    Abstract:

    This paper proposes a calibration method for a Coordinate Measuring Machine (CMM) using a laser tracking system. The laser tracking system can measure three-dimensional Coordinates based on the principle of trilateration with high accuracy and is easy to set up. The accuracy of length measurement of a single laser tracking interferometer (laser tracker) is about 0.3 µm over a length of 600 mm. In this study, we first measured 3D Coordinates using the laser tracking system. Secondly, 21 geometric errors, namely, parametric errors of the CMM, were estimated by the comparison of the Coordinates obtained by the laser tracking system and those obtained by the CMM. As a result, the estimated parametric errors agreed with those estimated by a ball plate measurement, which demonstrates the validity of the proposed calibration system.

Migacheva G. N. - One of the best experts on this subject based on the ideXlab platform.

  • Structure and operation of the training Coordinate Measuring Machine with computer numerical control of model NIIK-701
    РГППУ, 2019
    Co-Authors: Бирюкова, Е. А., Козлова, А. А., Мигачева, Г. Н., Biryukova E. A., Kozlova A. A., Migacheva G. N.
    Abstract:

    В условиях современного производства требования к точности и скорости измерений непрерывно повышаются, возрастает роль измерительных средств, точность которых должна быть на порядок выше, чем допустимая погрешность. В статье рассмотрен принцип работы и основные элементы учебной координатно-измерительной машины с числовым программным управлением НИИК-701.In the conditions of modern manufacture demands to accuracy and speed of measurements continuously raise, the role of Measuring means increases which accuracy should be an order of magnitude higher than a permissible error. The article describes the principle of operation and the main elements of the training Coordinate Measuring Machine with computer numerical control of model NIIK-701

  • Development of the process of calibration of a probe on the training Coordinate Measuring Machine with computer numerical control of model NIIK-701
    РГППУ, 2019
    Co-Authors: Бирюкова, Е. А., Козлова, А. А., Мигачева, Г. Н., Biryukova E. A., Kozlova A. A., Migacheva G. N.
    Abstract:

    Координатные измерения применяются в различных областях производства. Функции учебных координатно-измерительных машин позволяют обучающимся получить практические навыки работы в условиях современного производства при измерениях. В статье рассмотрен процесс калибровки щупа на учебной координатно-измерительной машине с числовым программным управлением НИИК-701.Coordinate measurements are used in various areas of manufacture. The functions of training Coordinate Measuring Machines allow students to gain practical skills in modern manufacture in measurements. The article describes the process of calibration of the probe on the training Coordinate Measuring Machine with computer numerical control of model NIIK-701