A5065123916- Arctic and Antarctic ice dynamics
- Cryospheric studies and observations
- Icing and De-icing Technologies
- Climate change and permafrost
- Fatigue and fracture mechanics
- Structural Integrity and Reliability Analysis
- Ship Hydrodynamics and Maneuverability
- Ocean Waves and Remote Sensing
- Ultrasonics and Acoustic Wave Propagation
- Smart Materials for Construction
- Welding Techniques and Residual Stresses
- Wave and Wind Energy Systems
- Arctic and Russian Policy Studies
- Maritime Transport Emissions and Efficiency
- Marine and Coastal Research
- Fluid Dynamics Simulations and Interactions
- Engineering Applied Research
- Offshore Engineering and Technologies
- Structural Health Monitoring Techniques
- Spacecraft and Cryogenic Technologies
- Hydrogen embrittlement and corrosion behaviors in metals
- Optical measurement and interference techniques
- Technology Assessment and Management
- Engineering Structural Analysis Methods
- Coastal and Marine Dynamics
Universität Hamburg
2017-2024
Hamburg University of Technology
2017-2024
Hamburg Institut (Germany)
2022
Aalto University
2010-2016
Norwegian University of Science and Technology
2013-2016
Irregular, unidirectional surface water waves incident on model ice in an tank are used as a physical of ocean wave interactions with sea ice. Results given for experiment consisting three tests, starting continuous cover and which the steepness increases between tests. The range from causing no breakup to full length cover. Temporal evolution edge, breaking front mean floe sizes reported. Floe size distributions different tests analysed. spectrum distance into ice-covered is analysed terms...
High Frequency Mechanical Impact (HFMI) is one of the post-weld treatment methods. In this study, comparative axial fatigue tests were conducted on as-welded and HFMI-treated welded transverse attachment details. The test results demonstrated efficiency HFMI-treatment in life extension cracked structures, providing that existing crack size less than 1.2 mm. Cracks created some specimens through testing before HFMI-treatment, while other not subjected to any loading prior treatment. Many...
Rehabilitation of welded structures has gained increasing attention lately. This paper aims at investigating the efficiency Tungsten Inert Gas (TIG)-remelting and TIG-remelting followed by High Frequency Mechanical Impact treatment (TIG-HFMI) in fatigue life extension. Fatigue tests were carried out on as-welded cracked specimens after treatment. The lives treated increased remarkably two methods (TIG TIG-HFMI). Many ran-out 10 million cycles loading failed clamping location when tested a...
Ship collisions with floating ice in which the ship sustains damage are shared-energy regime – both and dissipate energy through inelastic deformations. The physics of these events rarely studied. Experience on conditions collision tests is limited. aim this paper to present an experimental study a scenario where impacted structure undergoes permanent deformations together failure. describes series laboratory-scale impact freshwater granular blocks against stiffened steel panels, presents...
A ship is an investment and built to create revenue. The decision whether the design of a realized or not therefore strongly affected by natural obstacles mission route. occurrence ice along arctic routes such obstacle affects significantly resistance required propulsion power. Advanced simulation environments, as panel methods CFD do exist yet for calculations hence semi-empirical formulations model tests need be employed assess validate design. Ice impose great expenses in terms time...
Abstract The environment in cold regions undergoes significant changes that manifest rising temperatures and melting ice caps. These processes allow access to new areas for shipping the installation of structures. However, occurring are not solely a reduction ice, but also waves increasingly occur contributing break up Marginal Ice Zone (MIZ) transport towards open sea. Much work has been done combine single topic disciplines: wave-hydrodynamics, mechanics structure wave-structure (WSI)...
Abstract Fatigue cracks have appeared as a significant issue for joints and connections in existing steel structures the last decades. Therefore, those are major inspection maintenance matter any structure's operator. This emphasises importance of using reliable detection method to determine crack size assessing severity such on structural integrity structure. In this article, effectiveness strain measurement detecting fatigue transversal non‐load carrying welded attachment subjected out...
Ships that are navigating in ice covered waters at risk of colliding with icebergs or floes, which can lead to severe damage the ship's hull certain conditions. Predicting these loads is great importance for design and safety ships. Ice driven by a range parameters, including properties such as compressive strength, geometry values related interaction (e.g. impact velocity). Classification rules requirements polar vessels account parameters extent. However, sea exhibits not only variability...
Abstract The propulsion system of a ship is critical element for its safety and integrity. Therefore, it must be maintained properly to ensure that vessel able fulfill primary purpose. need maintenance even more pronounced in ships where extreme environmental conditions, such as ice-covered waters, are expected. This due an increase the magnitude uncertainty loads therewith possible damages if fails. use digital twins becoming increasingly popular shipping can also used intelligent operation...
Several definitions of equivalent ice thickness for simplification complex cover are found in the literature. However, their systematic analysis is currently absent. Therefore, this paper reviews different and validates them against a high-fidelity transit simulator, determining most accurate one, with an average error 16% one analysed ship, 10.5% other. Furthermore, capability to predict ship besetting tested, accurately predicting event 88% cases. Moreover, sensitivity parameters not...
Performance simulation tools are of high significance for the design and especially optimization ships offshore structures. However, ice covered waters such hardly available either costly as model tests or have a limited range validity, semi-empirical formulas. This arises from complexity material insufficient knowledge on its mechanics. paper presents numerical analysis model-scale in which parameters developed that can represent: tension, compression in-situ downward bending. Those...
Designing ships for open water and ice requires a suitable design method to account the distinct challenges in ice. Ships with multi environment capabilities are of high complexity as result design-coupling, which is illustrated by matrices. In this context, article presents that includes ship performance evaluation based on Ship Merit Factor (SMF). The combines SMF route specific ship-dependent productivity allows compare technoeconomic operating Consequently, applied case study comparing...