Enhanced multi-fidelity modelling for digital twin and uncertainty quantification

TL;DR

This paper introduces a novel multi-fidelity surrogate modeling framework, H-PCFE and deep-HPCFE, to enhance digital twin accuracy and uncertainty quantification, addressing data fidelity issues in engineering applications.

Contribution

The paper presents a new multi-fidelity surrogate modeling approach combining PCFE and Gaussian processes, with a cascading deep-HPCFE scheme for improved digital twin tracking.

Findings

Effective in uncertainty quantification benchmarks

Improves digital twin system predictions

Addresses low-fidelity data errors

Abstract

The increasing significance of digital twin technology across engineering and industrial domains, such as aerospace, infrastructure, and automotive, is undeniable. However, the lack of detailed application-specific information poses challenges to its seamless implementation in practical systems. Data-driven models play a crucial role in digital twins, enabling real-time updates and predictions by leveraging data and computational models. Nonetheless, the fidelity of available data and the scarcity of accurate sensor data often hinder the efficient learning of surrogate models, which serve as the connection between physical systems and digital twin models. To address this challenge, we propose a novel framework that begins by developing a robust multi-fidelity surrogate model, subsequently applied for tracking digital twin systems. Our framework integrates polynomial correlated function expansion (PCFE) with the Gaussian process (GP) to create an effective surrogate model called H-PCFE. Going a step further, we introduce deep-HPCFE, a cascading arrangement of models with different fidelities, utilizing nonlinear auto-regression schemes. These auto-regressive schemes effectively address the issue of erroneous predictions from low-fidelity models by incorporating space-dependent cross-correlations among the models. To validate the efficacy of the multi-fidelity framework, we first assess its performance in uncertainty quantification using benchmark numerical examples. Subsequently, we demonstrate its applicability in the context of digital twin systems.