Raimund Rolfes
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View article: Uncertainty propagation via sample-based deterministic model updating for structural damage identification
Uncertainty propagation via sample-based deterministic model updating for structural damage identification Open
Structural health monitoring aims for the identification of damage. In order to identify damage using model updating, vibration measurement data is recorded, damage-sensitive features are identified and a numerical model is updated to matc…
View article: Temperature-compensated autoencoders with sequences of raw time-domain signals for damage detection and localization in active and passive SHM
Temperature-compensated autoencoders with sequences of raw time-domain signals for damage detection and localization in active and passive SHM Open
This study investigates an autoencoder trained with short-term sequences of raw time-domain signals for unsupervised damage detection and localization under varying temperatures. The approach is designed to overcome the lack of transferabi…
View article: A hybrid electromechanical phase-field and deep learning framework for predicting fracture in dielectric nanocomposites
A hybrid electromechanical phase-field and deep learning framework for predicting fracture in dielectric nanocomposites Open
The accurate and efficient prediction of crack propagation in dielectric materials is a critical challenge in structural health monitoring and the design of smart systems. This work presents a hybrid modeling framework that combines an ele…
View article: Kriging meta-models for damage equivalent load assessment of idling offshore wind turbines
Kriging meta-models for damage equivalent load assessment of idling offshore wind turbines Open
Lifetime reassessments of offshore wind turbines are very time consuming due to the large number of required simulations. As a result, the use of meta-models as surrogate models of the aeroelastic simulation model could offer a suitable al…
View article: Influence of Optimised Sensor Placements on Multi-Objective Model Updating for Damage Localisation
Influence of Optimised Sensor Placements on Multi-Objective Model Updating for Damage Localisation Open
International audience
View article: Comparing Gaussian process enhanced grey-box approaches to detect damage in unknown environmental conditions due to climate change
Comparing Gaussian process enhanced grey-box approaches to detect damage in unknown environmental conditions due to climate change Open
In vibration-based structural health monitoring (SHM), it is well known that environmental and operational variations (EOVs) affect the dynamic response of the structure of interest. This fact makes it difficult to distinguish between stru…
View article: Dynamic displacement measurement of a wind turbine tower using accelerometers: tilt error compensation and validation
Dynamic displacement measurement of a wind turbine tower using accelerometers: tilt error compensation and validation Open
For vibration-based structural health monitoring (SHM) of wind turbine support structures, accelerometers are often used. Besides the structural acceleration, the measured quantity also contains the acceleration component due to gravity, w…
View article: Robust Damage Detection and Localization Under Varying Environmental Conditions Using Neural Networks and Input‐Residual Correlations
Robust Damage Detection and Localization Under Varying Environmental Conditions Using Neural Networks and Input‐Residual Correlations Open
This study aims to evaluate sequences of raw time series using an autoencoder structure for unsupervised damage detection and localization under varying environmental conditions (ECs). When it comes to structural health monitoring (SHM) fo…
View article: Investigating the influence of a bubble curtain on the underwater sound wave field generated by offshore pile driving
Investigating the influence of a bubble curtain on the underwater sound wave field generated by offshore pile driving Open
Pile driving for offshore wind turbines typically generates high sound levels in the water column. Bubble curtains are frequently employed to protect marine fauna. This study aims to investigate the effect of a bubble curtain on the genera…
View article: Detectability of Structural Damage to a Lattice Tower using Eigenfrequencies and Gaussian Process Regression
Detectability of Structural Damage to a Lattice Tower using Eigenfrequencies and Gaussian Process Regression Open
One main challenge in structural health monitoring is distinguishing between the effects of actual system changes and changing environmental conditions (EC) on the monitored parameters. For this, data normalisation can be performed. Throug…
View article: Evaluating the mechanical behavior of carbon composites with varied ply-thicknesses using acoustic emission measurements
Evaluating the mechanical behavior of carbon composites with varied ply-thicknesses using acoustic emission measurements Open
Laminates are produced by stacking prefabricated plies composed of fiber products. Within the aerospace industry, a ply thickness of 125 μm is commonly regarded as the standard. Ply thicknesses of less than 100 μm are generally considered …
View article: Dynamical Behaviour and Strength of Structural Elements with Regeneration Induced Imperfections and Residual Stresses
Dynamical Behaviour and Strength of Structural Elements with Regeneration Induced Imperfections and Residual Stresses Open
Repair techniques allow to refurbish blades of jet engines and extend the service life of engine components. However, the mechanical properties of the repaired blades commonly differ from those of the nominal blades. The changes in vibrati…
View article: Phase-field modeling of fracture in viscoelastic–viscoplastic thermoset nanocomposites under cyclic and monolithic loading
Phase-field modeling of fracture in viscoelastic–viscoplastic thermoset nanocomposites under cyclic and monolithic loading Open
In this study, a finite deformation phase-field formulation is developed to investigate the effect of hygrothermal conditions on the viscoelastic–viscoplastic fracture behavior of epoxy nanocomposites under cyclic and monolithic loading. T…
View article: A weighted correction of RAPID for precise damage localization in composites using guided waves and principal component analysis
A weighted correction of RAPID for precise damage localization in composites using guided waves and principal component analysis Open
Composite materials are widely used in various engineering applications such as aerospace, automotive, construction, and sports equipment due to their superior mechanical properties, including a high strength-to-weight ratio, design flexib…
View article: Monitoring Fatigue of Grouted Connections Using Autoencoders and In-Situ Fiber Optical Sensors
Monitoring Fatigue of Grouted Connections Using Autoencoders and In-Situ Fiber Optical Sensors Open
This paper investigates a traditional autoencoder trained with time series data for unsupervised damage detection and localization. The results are validated using innovative fiber optical sensory inside the grouted connection of a monopil…
View article: In-situ monitoring of an offshore wind turbine blade using acceleration and strain measurements
In-situ monitoring of an offshore wind turbine blade using acceleration and strain measurements Open
One of the most critical components of wind turbines is the blades. As blades are constantly exposed to weather and high loads, they can wear and become damaged. Performing in-situ continuous monitoring can help detect sudden damages and p…
View article: Multi-Objective Model Updating of Tower Structures Featuring Closely Spaced Modes
Multi-Objective Model Updating of Tower Structures Featuring Closely Spaced Modes Open
In this contribution, we present a multi-objective model updating approach for the purpose of damage localisation and quantification on a girder mast structure based on closely spaced modes. In structural health monitoring (SHM), modal qua…
View article: Robust SHM: Redundancy approach with different sensor integration levels for long life monitoring systems
Robust SHM: Redundancy approach with different sensor integration levels for long life monitoring systems Open
Monitoring structures such as bridges or wind turbines using Structural Health Monitoring (SHM) methods allows continuous assessment of their condition and considerably faster action compared to conventional on-site inspection. Inevitably,…