Uncertainty Quantification With Mixed Data by Hybrid Convolutional Neural Network for Additive Manufacturing

Author:

Yin Jianhua1ORCID,Hu Zhen2,Du Xiaoping3

Affiliation:

1. School of Mechanical Engineering, Purdue University , West Lafayette, IN 47907

2. Department of Industrial and Manufacturing Systems Engineering, University of Michigan-Dearborn , Dearborn, IN 48128

3. Department of Mechanical and Energy Engineering, Indiana University - Purdue University Indianapolis , Indianapolis, IN 46202

Abstract

Abstract Surrogate models have become increasingly essential for replacing simulation models in additive manufacturing (AM) process analysis and design, particularly for assessing the impact of microstructural variations and process imperfections (aleatory uncertainty). However, these surrogate models can introduce predictive errors, introducing epistemic uncertainty. The challenge arises when dealing with image input data, which is inherently high-dimensional, making it challenging to apply existing uncertainty quantification (UQ) techniques effectively. To address this challenge, this study develops a new UQ methodology based on an existing concept of combining convolutional neural network (CNN) and Gaussian process (GP) regression (GPR). This CNN-GP method converts both numerical and image inputs into a unified, larger-sized image dataset, enabling direct dimension reduction with CNN. Subsequently, GPR constructs the surrogate model, not only providing predictions but also quantifying the associated model uncertainty. This approach ensures that the surrogate model considers both input-related aleatory uncertainty and model-related epistemic uncertainty when it is used for prediction, enhancing confidence in image-based AM simulations and informed decision-making. Three examples validate the high accuracy and effectiveness of the proposed method.

Publisher

ASME International

Reference38 articles.

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