TY  - JOUR
AU  - Joan Serrat
AU  - Felipe Lumbreras
AU  - Antonio Lopez
PY  - 2013//
TI  - Cost estimation of custom hoses from STL files and CAD drawings
T2  - COMPUTIND
JO  - Computers in Industry
SP  - 299
EP  - 309
VL  - 64
IS  - 3
PB  - Elsevier
KW  - On-line quotation
KW  - STL format
KW  - Regression
KW  - Gaussian process
N2  - We present a method for the cost estimation of custom hoses from CAD models. They can come in two formats, which are easy to generate: a STL file or the image of a CAD drawing showing several orthogonal projections. The challenges in either cases are, first, to obtain from them a high level 3D description of the shape, and second, to learn a regression function for the prediction of the manufacturing time, based on geometric features of the reconstructed shape. The chosen description is the 3D line along the medial axis of the tube and the diameter of the circular sections along it. In order to extract it from STL files, we have adapted RANSAC, a robust parametric fitting algorithm. As for CAD drawing images, we propose a new technique for 3D reconstruction from data entered on any number of orthogonal projections. The regression function is a Gaussian process, which does not constrain the function to adopt any specific form and is governed by just two parameters. We assess the accuracy of the manufacturing time estimation by k-fold cross validation on 171 STL file models for which the time is provided by an expert. The results show the feasibility of the method, whereby the relative error for 80% of the testing samples is below 15%.
L1  - http://refbase.cvc.uab.es/files/sll2013a.pdf
UR  - http://dx.doi.org/10.1016/j.compind.2012.11.009
N1  - ADAS; 600.057; 600.054; 605.203
ID  - Joan Serrat2013
ER  -