A5019013094- Linguistic research and analysis
- Structural Load-Bearing Analysis
- Linguistic Education and Pedagogy
- Mechanical stress and fatigue analysis
- Structural Integrity and Reliability Analysis
- Vibration and Dynamic Analysis
- Composite Structure Analysis and Optimization
- Geotechnical Engineering and Soil Mechanics
- Structural Engineering and Vibration Analysis
- Fluid Dynamics and Vibration Analysis
- Wave and Wind Energy Systems
- Civil and Structural Engineering Research
- Structural Health Monitoring Techniques
- Engineering Structural Analysis Methods
- Historical Linguistics and Language Studies
- Historical Geopolitical and Social Dynamics
- Drilling and Well Engineering
- Housing, Finance, and Neoliberalism
- Education Methods and Technologies
- Geotechnical Engineering and Underground Structures
- Historical Influence and Diplomacy
- Linguistic Variation and Morphology
- Geotechnical Engineering and Soil Stabilization
- European Law and Migration
- Maritime Transport Emissions and Efficiency
Leibniz University Hannover
2019-2024
TechnipFMC (Germany)
2023
Leibniz University of Applied Sciences
2023
Gesellschaft zur Förderung angewandter Informatik
2021
Fraunhofer Society
2021
An assessment of the elastic-plastic buckling limit state for multi-strake wind turbine support towers poses a particular challenge modern finite element analyst, who must competently navigate numerous modelling choices related to tug-of-war between meshing and computational cost, use solvers that are robust highly nonlinear behaviour, potential multiple near-simultaneously critical failure locations, complex issue imperfection sensitivity finally interpretation data into safe economic...
Abstract For the simulation of coupled dynamic response floating offshore wind turbines, it is crucial to calibrate hydrodynamic damping with experimental data. The aim this work find a set drag coefficients for semisubmersible platform Offshore Code Comparison Collaboration, Continuation, Correlation and unCertainity (OC6) project which provides suitable results an irregular sea state. Due complex interaction several degrees freedom (DOF), common time series decay tests. However, applying...
Abstract Extended keynote paper of Eurosteel 2021 This article provides an overview the various support structures for offshore wind turbines and addresses challenges that arise different design variants. First all, existing types are explained their benefits shortcomings discussed. Following that, focus is on material fatigue its analysis, which great importance due to cyclic loading structures. A central topic this experimental evaluation strength using large‐scale test setups...
Abstract The focus of the Offshore Code Comparison Collaboration, Continuation, with Correlation and unCertainity (OC6) project, which operates under International Energy Agency Wind Task 30, is to refine accuracy engineering tools used design offshore wind turbines. In support this work, a new validation campaign being developed that seeks better understand nonlinear wave loading excites floating systems at their low-frequency, rigid-body modes in surge pitch. data will be employed...
Abstract Suction buckets are large shell structures that have become a prominent alternative to pile foundations for bottom-fixed and floating offshore wind turbines. They embedded by applying negative pressure, which leads high risk of structural buckling during the installation. The prediction strength such shells is subject uncertainty, since it depends significantly on initial geometric imperfections resulting from fabrication process. aim this work understand reduce uncertainties in...
Abstract Der vorliegende Aufsatz gibt zunächst einen Überblick über die derzeitige und zukünftige Entwicklung in der Offshore‐Windenergie. Schwerpunkt liegt auf den stählernen Tragstrukturen. Hier dominieren sog. Monopiles. Mit deutlich geringerer Anzahl werden Jacket‐Konstruktionen aus Rohrprofilen angewendet. Durch hohen dynamischen Beanspruchungen gleichzeitig widrigen Umgebungsbedingungen See ergeben sich stahlbauspezifische Fragestellungen für Forschung. Das Institut Stahlbau Leibniz...
Abstract The buckling capacity of suction caissons during installation must be investigated, as these are sensitive to due their thin-walled structure. A geometric material nonlinear analysis with imperfections, in which the soil is modeled using continuum elements, provides most realistic results. Nonetheless, modeling behavior well consideration multiple imperfection shapes associated a high and computational effort. To avoid this, springs often used model soil. However, common approaches...
Abstract The objective of this article is to provide an overview on the development offshore wind energy and challenges regarding support structures turbines. Since field very broad, focus paper four topics: general energy, different design types, verification fatigue strength a review approval procedure new normative regulations. Hence, summary including outlook provided. Further, types are introduced. A central topic testing critical details, particularly connections. As author active in...
Abstract Suction Buckets sind etablierte Gründungselemente für Offshore‐Öl‐ und ‐Gasplattformen, die bisher in der Offshore‐Windindustrie nur vereinzelt eingesetzt wurden. Diese Fundamente können zusammen mit Unterstruktur installiert werden, wodurch zusätzliche Offshore‐Operationen wie das Grouting von Transition Pieces oder Jacket‐Beinen vermieden werden. Außerdem werden bei Installation Buckets, im Gegensatz zu Pfahlgründungen, minimale akustische Emissionen erzeugt, sodass...
Recently, suction buckets have become a very prominent foundation for bottom fixed and floating offshore wind turbines. They are embedded with an installation force that stems from water evacuation inside the bucket. This internal negative pressure leads to high risk of structural buckling. The buckling strength is significantly reduced by geometric imperfections. In previous work, equivalent imperfection forms were introduced lower bound was evaluated. However, it has not yet been possible...
Abstract The prediction of the buckling resistance shells is subject to uncertainty since it depends significantly on initial geometric imperfections caused by fabrication process. However, load case vacuum or uniform external pressure has not yet been extensively studied. Stress design approaches implement a reduction factor alpha that accounts for effect imperfections. This assumed be general lower bound but does account different ratios. expected imperfection sensitivities prevail...