Evaluation of corrosion process and monitoring techniques of mooring chain steel in the marine environment

Currently, as the utilization of offshore wind energy continues to increase, floating wind turbines are expected to be widely used. As the fixed system of the turbine, the safety of the mooring chain has gradually attracted the attention of researchers. Mooring chains immersed in seawater are mainly subjected to various mechanical loads and...

Feasibility study on condition-based maintenance of bolts using ultrasonic waves

The safety of offshore assets such as wind turbines, offshore cranes, and turret mooring systems partly relies on the integrity of heavy-duty bolted joints. These critical connections can be of different dimensions and exposed to monotonic and cyclic loading. Despite being small components of a structure, bolts need to be maintained...

Feasibility Study of the Development of a Digital Twin for the Structural Health Monitoring of Marine Structures Using Big Data

Structural health monitoring of maritime and offshore structures can contribute to the reduction of the amount of uncertainty in assessment of the operational loads and the structural integrity. Such a survey can also reduce the large safety margins during the design and optimize the conservative inspection and maintenance schedules. One of the...

Feasibility of locally-coupled elasto-plastic damage modeling for remaining life prediction of low-speed damaged roller bearings under heavy loading condition

Low-speed roller bearings are generally in the sheave bearings and turret bearings which are used in the offshore industry under heavy loads. One of the challenges to the integrity of these bearings is the presence of subsurface cracking in the raceways. Downtime cost, which is caused by the failure of<br/>these bearings is significant. Based on...

Feasibility evaluation of a non-destructive estimation of material properties of FRC structures using ultrasonic guided waves

Variations in the production process of fiber-reinforced composite (FRC)materials often influence the material properties of the end product more substantially than their metallic counterparts. It can be valuable for the structural performance and reliability to have a better estimation of the properties of the FRC after production. Detecting...

Feasibility of Acoustic Emission Methods for Fatigue Monitoring in Tubular Double Side Welded T-joints

In the field of fatigue testing in laboratory conditions, the common practice is uniaxial testing (i.e. in tension). The real-life loads on structures are usually not limited to one direction but contain multiaxial components. For this kind of testing, the ship and offshore structures department of Delft University of Technology developed a...

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...