Physics-Informed Framework for Impact Identification in Aerospace Composites

TL;DR

This paper presents a physics-informed impact identification framework for aerospace composites that combines physical knowledge with data-driven methods to achieve accurate, stable, and physically consistent impact detection.

Contribution

The novel framework integrates physics-based energy indicators and hybrid loss functions to improve impact identification accuracy and stability under degraded measurement conditions.

Findings

Mean absolute percentage errors below 8% for impact velocity and mass

Impact energy computed with kinetic energy consistency shows errors below 10%

Framework maintains performance with reduced data and noise, and generalizes across regimes

Abstract

This paper introduces a novel physics-informed impact identification (Phy-ID) framework. The proposed method integrates observational, inductive, and learning biases to combine physical knowledge with data-driven inference in a unified modelling strategy, achieving physically consistent and numerically stable impact identification. The physics-informed approach structures the input space using physics-based energy indicators, constrains admissible solutions via architectural design, and enforces governing relations via hybrid loss formulations. Together, these mechanisms limit non-physical solutions and stabilise inference under degraded measurement conditions. A disjoint inference formulation is used as a representative use case to demonstrate the framework capabilities, in which impact velocity and impactor mass are inferred through decoupled surrogate models, and impact energy is computed by enforcing kinetic energy consistency. Experimental evaluations show mean absolute percentage errors below 8% for inferred impact velocity and impactor mass and below 10% for impact energy. Additional analyses confirm stable performance under reduced data availability and increased measurement noise, as well as generalisation for out-of-distribution cases across pristine and damaged regimes when damaged responses are included in training. These results indicate that the systematic integration of physics-informed biases enables reliable, physically consistent, and data-efficient impact identification, highlighting the potential of the approach for practical monitoring systems.