Dynamic Error Prediction and Compensation of Coordinate Measuring Machines

2000 ◽  
Author(s):  
Chensong Dong ◽  
Chuck Zhang ◽  
Ben Wang ◽  
Guoxiong Zhang
Keyword(s):  
Manufacturing Industry ◽  
Systematic Approach ◽  
Laser Interferometer ◽  
Dynamic Error ◽  
Error Prediction ◽  
Coordinate Measuring Machines ◽  
Air Bearings ◽  
Touch Trigger Probe ◽  
Dynamic Errors ◽  
Measuring Tool

Abstract Coordinate measuring machines (CMMs) are already widely used as a measuring tool in the manufacturing industry. Fast probing is now the trend for next generation CMMs. However, increases in the measuring velocity of CMMs are limited by dynamic errors that occur in CMMs. In this paper, theoretical analysis and experimental research is used to create a systematic approach for modeling the dynamic errors of a touch-trigger probe CMM. First, an overall analysis of the dynamic errors of CMMs is given, and methods to improve the stiffness of air bearings are presented. Weak elements of the CMM are identified with a laser interferometer. The probing process, as conducted with a touch-trigger probe, is analyzed and dynamic errors are measured. Based on these analyses, the dynamic errors in touch-trigger probing are modeled using neural networks. In turn, dynamic errors are predicted. An approach to achieving software error compensation is discussed. Finally, the method and results from this study illustrate that it is possible to compensate for dynamic errors of CMMs.

Prediction and Compensation of Dynamic Errors for Coordinate Measuring Machines

2002 ◽  
Vol 124 (3) ◽  
pp. 509-514 ◽  
Author(s):  
Chensong Dong ◽  
Chuck Zhang ◽  
Ben Wang ◽  
Guoxiong Zhang
Keyword(s):  
Neural Networks ◽  
Experimental Study ◽  
Theoretical Analysis ◽  
Manufacturing Industry ◽  
Systematic Approach ◽  
Laser Interferometer ◽  
Coordinate Measuring Machines ◽  
Touch Trigger Probe ◽  
Dynamic Errors ◽  
Modern Manufacturing

Coordinate measuring machines (CMMs) are already widely utilized as measuring tools in the modern manufacturing industry. Rapidly approaching now is the trend for next-generation CMMs. However, the increases in measuring velocity of CMM applications are limited by dynamic errors that occur in CMMs. In this paper, a systematic approach for modeling the dynamic errors of a touch-trigger probe CMM is developed through theoretical analysis and experimental study. An overall analysis of the dynamic errors of CMMs is conducted, with weak components of the CMM identified with a laser interferometer. The probing process, as conducted with a touch-trigger probe, is analyzed. The dynamic errors are measured, modeled, and predicted using neural networks. The results indicate that, using this mode, it is possible to compensate for the dynamic errors of CMMs.

Reducing the Dynamic Errors of Coordinate Measuring Machines

2003 ◽  
Vol 125 (4) ◽  
pp. 831-839 ◽  
Author(s):  
Chensong Dong ◽  
Chuck Zhang ◽  
Ben Wang ◽  
Guoxiong Zhang
Keyword(s):  
Manufacturing Industry ◽  
Load Capacity ◽  
Current Trend ◽  
Coordinate Measuring Machines ◽  
Air Bearings ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dynamic Errors ◽  
Modern Manufacturing ◽  
Bearing Design

Coordinate measuring machines (CMMs) are already widely utilized as measuring tools in the modern manufacturing industry. Fast and accurate probing is the current trend for the next generation of CMMs. However, measuring velocity of CMM applications are limited by dynamic errors that occur in CMMs. In this paper, the dynamic errors of coordinate measuring machines are analyzed theoretically and experimentally. The limited stiffness of air bearings were found to cause dynamic errors due to the existence of Abbe’s offsets. The characteristics of the air bearings used on CMMs were modeled by the finite element analysis (FEA). The load capacity and stiffness of the air bearings were computed. Using this model, the dynamic errors of the CMM were reduced through revising the air bearing design. To verify the effectiveness of this approach, the performance of the air bearings was tested both statically and dynamically. The results show that the dynamic errors can be significantly reduced.

scholarly journals Investigation of Position and Velocity Stability of the Nanometer Resolution Linear Motor Stage with Air Bearings by Shaping of Controller Transfer Function

Symmetry ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2062
Author(s):  
Artur Piščalov ◽  
Edgaras Urbonas ◽  
Nikolaj Višniakov ◽  
Darius Zabulionis ◽  
Artūras Kilikevičius
Keyword(s):  
Transfer Function ◽  
Dynamic Error ◽  
Linear Motor ◽  
Symmetric System ◽  
Air Bearings ◽  
Feedback Systems ◽  
Mechatronic Systems ◽  
Industrial Enterprises ◽  
Dynamic Errors ◽  
Moving Platform

Modern industrial enterprises require high accuracy and precision feedback systems to fulfil cutting edge requirements of technological processes. As demand for a highly accurate system grows, a thin gap between throughput and quality exists. The conjunction of ultrafast lasers and modern control strategies of mechatronic systems can be taken into account as an effective solution to reach both throughput and tolerances. In the present paper, the dynamic errors of the moving platform of the one degree of freedom stage, based on linear motor and air bearings, have been analyzed. A precision positioning system is investigated as a symmetric system which is based on symmetric linear motor. The goal of the present article is to investigate the controllers of the different architecture and to find the best controller that can ensure a stable and small dynamic error of the displacement of the stage platform at four different constant velocities of the moving platform. The relations between the controller order, velocity and the displacement dynamic error have been investigated. It is determined that higher-order controllers can reduce the dynamic error significantly at low velocities of the moving platforms: 1 and 5 mm/s. On the contrary, the low order controllers of 4th-degree polynomials of the transfer function can also provide small dynamic errors of the displacement of the platform.

A dynamic pre-travel error prediction model for the kinematic touch trigger probe

Measurement ◽  
2019 ◽  
Vol 146 ◽  
pp. 689-704 ◽  
Author(s):  
Yamin Li ◽  
Long Zeng ◽  
Kai Tang ◽  
Simi Li
Keyword(s):  
Prediction Model ◽  
Error Prediction ◽  
Touch Trigger Probe

Calibration and Compensation of Dynamic Abbe Errors of a Coordinate Measuring Machine

2017 ◽  
Vol 140 (5) ◽  
Author(s):  
Daocheng Yuan ◽  
Xin Tao ◽  
Caijun Xie ◽  
Huiying Zhao ◽  
Dongxu Ren ◽  
...  
Keyword(s):  
Error Compensation ◽  
Dynamic Error ◽  
Coordinate Measuring Machine ◽  
Calibration Method ◽  
Local Dynamic ◽  
Operational Parameters ◽  
Dynamic Errors ◽  
Measuring Machine ◽  
Reducing Costs ◽  
Improving Accuracy

Error compensation technology is used for improving accuracy and reducing costs. Dynamic error compensation techniques of coordinate measuring machine (CMM) are still under study; the major problem is a lack of suitable models, which would be able to correctly and simply relate the dynamic errors with the structural and operational parameters. To avoid the complexity of local dynamic deformation measurement and modeling, a comprehensive calibration method is employed. Experimental research reveals specific qualities of dynamic Abbe errors; the results exceed the scope of ISO 10360-2 calibration method, showing the ISO 10360-2 dynamic error evaluation deficiencies. For calibrating the dynamic Abbe errors, the differential measurement method is presented based on the measurements of the internal and external dimensions. Referring probe tip radius correction, the dynamic Abbe errors compensation method is proposed for CMM end-users and is easy to use.

Comparison between a Laser Micrometer and a Touch Trigger Probe for Workpiece Measurement on a CNC Lathe

2012 ◽  
Vol 498 ◽  
pp. 49-54 ◽  
Author(s):  
G. Valiño ◽  
C.M. Suárez ◽  
J.C. Rico ◽  
B.J. Álvarez ◽  
D. Blanco
Keyword(s):  
Coordinate Measuring Machines ◽  
Machine Accuracy ◽  
Dimensional Inspection ◽  
Cnc Lathe ◽  
Touch Trigger Probe ◽  
Repeatability And Reproducibility ◽  
Cylindrical Workpiece ◽  
Machine Control

The current requirements for an efficient dimensional inspection of manufactured parts have lead to development of different in process and on-machine measurement (OMM) techniques. Touch trigger probes (TTP) are the most common technologies utilized, inspired on contact probes used on coordinate measuring machines (CMMs). The on-machine accuracy of TTPs depends upon precision of the tool-machine control as well as upon the procedure for TTP presetting. Taking this into account, a different OMM technique is considered in this work, which consists on a laser micrometer (LM) that is commonly used for in-process measurement of continuous products. The behaviour of TTP and LM is analysed and discussed in terms of repeatability and reproducibility. Results obtained by both techniques are compared each other by measuring a cylindrical workpiece and by checking the results with those obtained on a CMM.

scholarly journals Study of Intelligent Photovoltaic System Fault Diagnostic Scheme Based on Chaotic Signal Synchronization

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Chin-Tsung Hsieh ◽  
Jen Shiu
Keyword(s):  
Fault Diagnosis ◽  
Embedded System ◽  
Dynamic Error ◽  
Chaotic Signal ◽  
Labor Cost ◽  
Photovoltaic System ◽  
Classical Domain ◽  
Voltage Signal ◽  
Signal Synchronization ◽  
Dynamic Errors

As the photovoltaic system consists of many equipment components, manual inspection will be very costly. This study proposes the photovoltaic system fault diagnosis based on chaotic signal synchronization. First, MATLAB was used to simulate the fault conditions of solar system, and the maximum power point tracking (MPPT) was used to ensure the system's stable power and capture and record the system fault feature signals. The dynamic errors of various fault signals were extracted by chaotic signal synchronization, and the dynamic error data of various fault signals were recorded completely. In the photovoltaic system, the captured output voltage signal was used as the characteristic values for fault recognition, and the extension theory was used to create the joint domain and classical domain of various fault conditions according to the collected feature data. The matter-element model of extension engineering was constructed. Finally, the whole fault diagnosis system is only needed to capture the voltage signal of the solar photovoltaic system, so as to know the exact fault condition effectively and rapidly. The proposed fault diagnostor can be implemented by embedded system and be combined with ZigBee wireless network module in the future, thus reducing labor cost and building a complete portable renewable energy system fault diagnostor.

scholarly journals Compensation for dynamic errors of coordinate measuring machines

Measurement ◽  
1997 ◽  
Vol 20 (3) ◽  
pp. 197-209 ◽  
Author(s):  
W.G. Weekers ◽  
P.H.J. Schellekens
Keyword(s):  
Coordinate Measuring Machines ◽  
Dynamic Errors
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