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Study on Mechanical Structure and Measuring Error of Artificial Coordinate Measuring Machine

Author: HuangZhiDong
Tutor: HuangShuHuai
School: Huazhong University of Science and Technology
Course: Materials Processing Engineering
Keywords: Articulated coordinate measuring machine Measurement error Structural parameters Demarcate Rock joints
CLC: TH721
Type: Master's thesis
Year: 2005
Downloads: 289
Quote: 12
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Abstract

Articulated coordinate measuring machine is a new non- Cartesian coordinate measuring machine can be widely used in reverse engineering , industrial field measurement and other fields. In contrast to conventional coordinate measuring machine, which has a light weight , small size, easy to carry and measurement flexibility and good. But on the other hand, because stem length and angle error amplification position error of each articulated arm superposition role in making articulated coordinate measuring machine accuracy is low relative to traditional coordinate measuring machines . Therefore, to improve measurement precision coordinate measuring machine is articulated key technical problems. This paper focuses on improving measurement precision on this key issue for the following aspects of the research . The mechanical design of the instrument to take the following measures reduce measurement error : the use of carbon graphite fiber rods measuring machines for manufacturing materials to reduce the temperature influence on the measurement accuracy transform ; joints used in pairs at each angular contact bearings , and applying a preload to increase the rigidity of the rotation axis of the joint , because the joint to minimize the measurement error caused by shaking . In determining instrument coordinate system of each joint , the use of space homogeneous transformation principle , the establishment of joint shaking does not consider the case of measuring the equation of motion , and structural parameters of the system are derived error equations . The measurement error based on the equation , given the structure of three calibration parameters to the system by way of the comparison of the advantages and disadvantages of the three methods , the proposed use of combining them in order to achieve complementary three methods thought. In order to make the instrument to achieve higher accuracy , this paper presents a response to the joint axis shaking caused by measurement error for quantitative analysis and research ideas . In the above measurement on the basis of the equations of motion , by adding to the rotation axis of the joint deflection describe the spatial blurring homogeneous transformation matrix , the establishment of the measurement error caused by shaking joint mathematical equation , and then proposed a \ideas for solving the biggest joint shaking error , and for the actual design of the instrument determined the maximum measurement error calculations.

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