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Automatic Laser-based Geometry Capture for Finite Element Analysis of Weld Beads

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Articulated arm coordinate measuring machine calibration by laser tracker multilateration.

Jorge Santolaria¹, Ana C Majarena¹, David Samper¹

¹Departamento de Ingeniería de Diseño y Fabricación, Edificio Torres Quevedo, EINA, Universidad de Zaragoza, 50018 Zaragoza, Spain.

Thescientificworldjournal

|April 2, 2014

Summary

A novel self-calibration procedure enhances articulated arm coordinate measuring machine (AACMM) precision. This method uses four laser trackers (LTs) for accurate spatial localization and a nonlinear optimization algorithm to minimize measurement discrepancies.

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Area of Science:

Metrology
Mechanical Engineering
Instrumentation

Background:

Articulated arm coordinate measuring machines (AACMMs) are crucial for dimensional inspection.
Accurate calibration is essential for maintaining AACMM precision and reliability.
Existing calibration methods may have limitations in terms of accuracy and efficiency.

Purpose of the Study:

To present a new, effective procedure for calibrating AACMMs.
To improve the precision of AACMMs through a novel self-calibration technique.
To establish a robust method for identifying AACMM model parameters.

Main Methods:

Development of a self-calibration algorithm for four laser trackers (LTs).
Utilizing a geometric multilateration system for spatial target localization.
Application of a nonlinear optimization algorithm with an objective function based on Euclidean distances and standard deviations.

Main Results:

The proposed procedure effectively calibrates AACMMs.
Using LTs as a gauge instrument significantly improves AACMM precision.
The nonlinear optimization successfully identifies model parameters by minimizing coordinate differences.

Conclusions:

The presented calibration procedure offers a highly effective solution for enhancing AACMM accuracy.
The integration of laser tracker technology provides a reliable gauge instrument for calibration.
This method contributes to more precise dimensional metrology applications.