Temperature and Load effects in Modelling and Experimental Verification of Acoustic Emission Signals for Structural Health Monitoring Applications

The present study focuses on understanding the effect of load and temperature on Acoustic Emission (AE) signal propagation in an Aluminium 2024-T3 panel. In addition, the ability of an AE system to locate damage under these operational and environmental conditions was evaluated. The work was performed in two stages. In stage one, the wave group...

Temperature effects on an Acoustic Emission based Structural Health Monitoring System: Applied to Composite Materials

Acoustic Emission (AE) based structural health monitoring systems have the potential to assess the state of metallic / composite structures and detect damage in real time as it grows. This is done by monitoring the Lamb waves that occur due to the release of energy and the specific boundary conditions. Environmental and Operational Conditions ...

Acoustic Emission Monitoring: of Offshore Wind Turbine Support Structures for Detection and Localization of Fatigue Crack Growth

Offshore wind turbines are used more and more for the production of our electricity. The wind turbines are located in a remote and harsh environment, and are subject to heavy cyclic loading, which may cause fatigue in the support structures. Periodic inspections are required to assess the structural health of the wind turbines. Acoustic Emission...

Using passive and active acoustic methods for impact damage assessment of composite structures

This study aims to use the passive and active acoustic-based health monitoring methods for impact damage assessment of composite structures. To this aim, a Carbon Fiber Reinforced Polymer (CFRP) composite plate was fabricated and subjected to a simulated low-velocity impact by performing repeated quasi-static indentation tests where a loading...

Feasibility evaluation for non-contact ultrasonic inspection of mooring chains through marine growth

Mooring chains are subject to dynamic loads and corrosion. A challenging aspect in assessing the integrity of mooring chains is the presence of marine growth. Marine growth removal is expensive, environmentally damaging, and includes the risk of restarting corrosion process. The focus of this research is on the feasibility of mooring chains...

Damage assessment of highly-loaded low-speed roller bearings with acoustic emission monitoring: A full-scale laboratory evaluation

Highly-loaded low-speed roller bearings are frequently used in equipment offshore e.g. slew bearings in crane, sheave bearings and FPSO turret bearings. Reducing maintenance costs, increasing productivity, ensuring safety of people and structural integrity and longevity assurance of equipment can be achieved by the condition monitoring of highly...

Developing health indicators for composite structures based on a two-stage semi-supervised machine learning model using acoustic emission data

Composite structures are highly valued for their strength-to-weight ratio, durability, and versatility, making them ideal for a variety of applications, including aerospace, automotive, and infrastructure. However, potential damage scenarios like impact, fatigue, and corrosion can lead to premature failure and pose a threat to safety. This...