Uncertainty analysis of coordinate measuring machine (CMM) measurements

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2007

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Sözak, Ahmet

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In this thesis, the measurement uncertainty of Coordinate Measuring Machine (CMM) is analysed and software is designed to simulate this. Analysis begins with the inspection of the measurement process and structure of the CMMs. After that, error sources are defined with respect to their effects on the measurement and then an error model is constructed to compensate these effects. In other words, systematic part of geometric, kinematic and thermal errors are compensated with error modelling. Kinematic and geometric error model is specific for the structure of CMM under inspection. Also, a common orthogonal kinematic model is formed and with using the laser error data of the CMM and error maps of the machine volume is obtained. Afterwards, the models are compared with each other by taking the difference and ratio. The definition and compensation of the systematic errors leave the uncertainty of measurements for analysing. Measurement uncertainty consists of the uncompensated systematic errors and random errors. The other aim of the thesis is to quantify these uncertainties with using the different methods and to inspect the success of these methods. Uncertainty budgeting, comparison, statistical evaluation by designing an experiments and simulation methods are examined and applied to the CMM under inspection. In addition, Virtual CMM software is designed to simulate the task specific measurement uncertainty of circle, sphere and plane without using the repeated measurements. Finally, the performance of the software, highly depending on the mathematical modelling of machine volume, is tested by using actual measurements.

Subject Keywords

Mechanical Engineering.

URI

http://etd.lib.metu.edu.tr/upload/2/12608887/index.pdf
https://hdl.handle.net/11511/16754

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

A. Sözak, “Uncertainty analysis of coordinate measuring machine (CMM) measurements,” M.S. - Master of Science, Middle East Technical University, 2007.