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Precision Engineering

by Neeraj Panhalkar last modified 2015-03-06 18:28

Geometric Dimensioning and Tolerancing (GD&T) specifications are used in part drawings to convey engineering tolerances. The researchers in CGDM led by Dr. Anand have developed several computational algorithms to calculate form, orientation, profile and runout errors in manufactured parts.
Methods used for developing these algorithms include Hough Transform, Selective Data Partition Approach, Simulated Annealing, Genetic Algorithm, Simplex Search, Artificial Neural Networks, etc. These algorithms will assist engineers to predict and calculate the GD&T errors in parts with increased accuracy and repeatability.

Figure: Left: Flatness Evaluation; Right: Cylindricity Evaluation

Figure: Left: Sphericity Evaluation; Right: Tolerance Zone of a Cylinder

Dr. Anand and his students have also developed several algorithms to solve the problem of data localization for freeform surfaces. Data localization refers to the process of aligning the cloud of points sampled from manufactured freeform surfaces using CMM or laser scanning machines to the design surface for inspection. General Hopfield Networks, k-d Trees, etc are some of the techniques that have been used to solve the data localization problem.

Figure: Left: Data Localization; Right: Hopfield Network

Figure: Blue: Designed Surface, Red: Manufactured Surface.
Left: Before Data Localization; Right: After Data Localization

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