Ferri, C., Mastrogiacomo, L. and Faraway, J., 2010. Sources of variability in the set-up of an Indoor GPS. International Journal of Computer Integrated Manufacturing, 23 (6), pp. 487-499.
An increasing demand for an extended flexibility to model types and production volumes in the manufacture of large-size assemblies has generated a growing interest in the reduction of jigs and fixtures deployment during assembly operations. A key factor enabling and sustaining this reduction is the constantly expanding availability of instruments for dimensional measurement of large-size products. However, the increasing complexity of these measurement systems and their set-up procedures may hinder the final users in their effort to assess whether the performance of these instruments is adequate for pre-specified inspection tasks. In this paper, mixed-effects and fixed-effects linear statistical models are proposed as a tool to assess quantitatively the effect of set-up procedures on the uncertainty of measurement results. This approach is demonstrated on a Metris Indoor GPS system (iGPS). The main conclusion is that more than 99% of the variability in the considered measurements is accounted for by the number of points used in the bundle adjustment procedure during the set-up phase. Also, different regions of the workspace have significantly different error standard deviations and a significant effect on the transient duration of measurement. This is expected to affect adversely the precision and unbiasedness of measurements taken with Indoor GPS when tracking moving objects.
|Item Type ||Articles|
|Creators||Ferri, C., Mastrogiacomo, L. and Faraway, J.|
|Departments||Faculty of Science > Mathematical Sciences|
Faculty of Engineering & Design > Mechanical Engineering
|Research Centres||Innovative Design & Manufacturing Research Centre (IdMRC)|
|Publisher Statement||Carlo_Ferri_indoor.pdf: This is an electronic version of an article published in: Ferri, C., Mastrogiacomo, L., Faraway, J., 2010. Sources of variability in the set-up of an Indoor GPS. International Journal of Computer Integrated Manufacturing, 23 (6), pp. 487-499. The International Journal of Computer Integrated Manufacturing is available online at: http://www.informaworld.com/openurl?genre=journal&issn=0951-192X|
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