A learning-based approach to feature recognition of Engineering shapes

TL;DR

This paper introduces a novel, efficient machine learning method using discrete Gauss maps for recognizing engineering shape features in CAD mesh models, outperforming existing approaches in accuracy and speed, especially with noisy data.

Contribution

The paper presents a new feature recognition technique based on discrete Gauss maps that requires less memory, training time, and hyperparameter tuning, with accuracy comparable to CNNs.

Findings

Achieves high recognition accuracy with less memory and training time.

Effectively handles noisy CAD mesh data.

Performs well on complex and multiple feature models.

Abstract

In this paper, we propose a machine learning approach to recognise engineering shape features such as holes, slots, etc. in a CAD mesh model. With the advent of digital archiving, newer manufacturing techniques such as 3D printing, scanning of components and reverse engineering, CAD data is proliferated in the form of mesh model representation. As the number of nodes and edges become larger in a mesh model as well as the possibility of presence of noise, direct application of graph-based approaches would not only be expensive but also difficult to be tuned for noisy data. Hence, this calls for newer approaches to be devised for feature recognition for CAD models represented in the form of mesh. Here, we show that a discrete version of Gauss map can be used as a signature for a feature learning. We show that this approach not only requires fewer memory requirements but also the training time is quite less. As no network architecture is involved, the number of hyperparameters are much lesser and can be tuned in a much faster time. The recognition accuracy is also very similar to that of the one obtained using 3D convolutional neural networks (CNN) but in much lesser running time and storage requirements. A comparison has been done with other non-network based machine learning approaches to show that our approach has the highest accuracy. We also show the recognition results for CAD models having multiple features as well as complex/interacting features obtained from public benchmarks. The ability to handle noisy data has also been demonstrated.