WaveletInception Networks for on-board Vibration-Based Infrastructure Health Monitoring

TL;DR

This paper introduces WaveletInception Networks, a deep learning framework that combines spectral feature extraction and multi-scale analysis for effective on-board infrastructure health monitoring using vibration signals.

Contribution

It proposes a novel deep learning architecture integrating LWPT, Inception-ResNet, and BiGRU modules for automated, high-resolution infrastructure health assessment from vibration data.

Findings

Outperforms state-of-the-art methods in case studies

Accurately localizes infrastructure health issues

Effectively analyzes signals at varying speeds without preprocessing

Abstract

This paper presents a deep learning framework for analyzing on board vibration response signals in infrastructure health monitoring. The proposed WaveletInception-BiGRU network uses a Learnable Wavelet Packet Transform (LWPT) for early spectral feature extraction, followed by one-dimensional Inception-Residual Network (1D Inception-ResNet) modules for multi-scale, high-level feature learning. Bidirectional Gated Recurrent Unit (BiGRU) modules then integrate temporal dependencies and incorporate operational conditions, such as the measurement speed. This approach enables effective analysis of vibration signals recorded at varying speeds, eliminating the need for explicit signal preprocessing. The sequential estimation head further leverages bidirectional temporal information to produce an accurate, localized assessment of infrastructure health. Ultimately, the framework generates high-resolution health profiles spatially mapped to the physical layout of the infrastructure. Case studies involving track stiffness regression and transition zone classification using real-world measurements demonstrate that the proposed framework significantly outperforms state-of-the-art methods, underscoring its potential for accurate, localized, and automated on-board infrastructure health monitoring.