Blar i NTNU Open på forfatter "Muskulus, Michael"

Viser treff 21-40 av 97

    • Dynamic Analysis and Structural Optimization of Support Structures for bottom-fixed Offshore Wind Turbines 

      Schafhirt, Sebastian (Doctoral theses at NTNU ;2017:363, Doctoral thesis, 2017)
      Wind energy is recognized as a reliable and affordable source of energy for generating electricity. Up to date most of the wind energy capacity is installed onshore, but legal regulations and a shortage of potential locations ...

    • Effect of Load Sequence and Weather Seasonality on Fatigue Crack Growth for Monopile-based Offshore Wind Turbines 

      Ziegler, Lisa Sabine; Schafhirt, Sebastian; Scheu, Matti Niclas; Muskulus, Michael (Journal article; Peer reviewed, 2016)
      Offshore wind turbines are subjected to variable amplitude loading, but the impact of load sequence is commonly neglected in fatigue analysis. This paper presents an initial investigation if load sequence and weather ...

    • Efficient Modelling and Design Optimization of Large Floating Wind Turbines 

      Hegseth, John Marius (Doctoral theses at NTNU;2020:356, Doctoral thesis, 2020)
      Floating wind turbines (FWTs) are considered a promising solution for wind energy harvesting in deep water, but are currently too expensive to compete with other energy sources. Being a relatively new and immature technology ...

    • Evaluation of the Fatigue Resistance of Offshore Jacket Joints by Numerical Approaches 

      Mendoza Espinosa, Jorge (Master thesis, 2017)
      Jacket support structures are a preferred solution for offshore wind turbines in deeper waters. Extensive knowledge exists in relation to its construction technique as well as its crucial components, but due to considerable ...

    • Fatigue Assessment of Offshore Wind Turbine Support Structures with the Frequency Domain Method 

      Sande, Einar Sortland (Master thesis, 2015)
      Offshore wind energy has shown great potential and can be a great contributor when it comes to solving some of the climate challenges that the world faces today. However, both design and operational cost has been a limiting ...

    • Fatigue Assessment of Offshore Wind Turbines Using Measurements of Individual Turbines and Machine Learning Techniques 

      Lee, Jaehyeun (Master thesis, 2019)
      Tretthet er ofte en styrende designfaktor for havvindmøller. Siden utformingen av offshore vindturbiner inkluderer konservatisme, kan den faktiske akkumulerte tretthetsskaden være lavere enn hva turbinen er beregnet på. I ...

    • Fatigue crack detection for lifetime extension of monopile-based offshore wind turbines 

      Stutzmann, Jutta; Ziegler, Lisa Sabine; Muskulus, Michael (Journal article; Peer reviewed, 2017)
      Lifetime extension becomes increasingly crucial for industry, since the first offshore wind farms face the end of their design lifetime. The remaining useful lifetime of offshore foundations is driven by fatigue design and ...

    • Fatigue damage in an offshore wind turbine using probability density evolution 

      Eiken, Odd (Master thesis, 2017)
      Due to large variability of the offshore environment, the load analysis of an offshore wind turbine is a complex task. It is normally performed in the time domain, by running Monte Carlo simulations. However, this is usually ...

    • Fatigue Damage on Offshore Wind Turbines by a Cell Mapping Method 

      Eiken, Odd; Muskulus, Michael (Journal article; Peer reviewed, 2018)
      Due to large variability of the offshore environment, the load analysis of an offshore wind turbine is a complex task. It is normally performed in the time domain, by running stochastic simulations. This is usually very ...

    • Fatigue reassessment for lifetime extension of offshore wind monopile substructures 

      Muskulus, Michael; Ziegler, Lisa Sabine (Journal article; Peer reviewed, 2016)
      Fatigue reassessment is required to decide about lifetime extension of aging offshore wind farms. This paper presents a methodology to identify important parameters to monitor during the operational phase of offshore wind ...

    • FE8 type laboratory testing of white etching crack (WEC) bearing failure mode in 100Cr6 

      Danielsen, H. K.; Guzmán, F. G.; Muskulus, Michael; Rasmussen, B. H.; Shirani, M.; Cornel, D.; Sauvage, P.; Wu, J.; Petrov, R. V.; Jacobs, G. (Journal article; Peer reviewed, 2019)
      WEC is an aggressive and unpredictable failure mode affecting bearings in particular in the wind energy sector. This paper focuses on the most common used method for WEC laboratory accelerated testing, the FE8 type test ...

    • Future emerging technologies in the wind power sector: a European perspective 

      Watson, Simon; Moro, Alberto; Reis, Vera; Baniotopoulos, Charalampos; Barth, Stephan; Bartoli, Gianni; Bauer, Florian; Boelman, Elisa; Bosse, Denis; Cherubini, Antonello; Croce, Alessandro; Fagiano, Lorenzo; Fontana, Marco; Gambier, Adrian; Gkoumas, Konstantinos; Golightly, Christopher; Latour, Mikel Iribas; Jamieson, Peter; Kaldellis, John; Macdonald, Andrew; Murphy, Jimmy; Muskulus, Michael; Petrini, Francesco; Pigolotti, Luca; Rasmussen, Fleming; Schild, Philippe; Schmehl, Roland; Stavridou, Nafsika; Tande, John Olav Giæver; Taylor, Nigel A.S.; Telsnig, Thomas; Wiser, Ryan (Journal article; Peer reviewed, 2019)
      This paper represents an expert view from Europe of future emerging technologies within the wind energy sector considering their potential, challenges, applications and technology readiness and how they might evolve in the ...

    • Global slamming forces on jacket structures for offshore wind applications 

      Cheng, Zhengshun; Muskulus, Michael (Journal article; Peer reviewed, 2018)
      This study investigates the global slamming forces due to plunging breaking waves on a jacket structure, based on the statistical analysis of the experimental data from the WaveSlam project. Hammer tests and wave tests ...

    • Gradient-based Optimization of Jacket Support Structure for Offshore Wind Turbines with the Local Approach 

      Xyloudis, Nikolaos (Master thesis, 2017)
      The objective of this thesis is the development of a gradient based optimization framework for the local optimization of structural members of an offshore wind turbine with jacket support structure and the implementation ...

    • Grand challenges in the science of wind energy 

      Veers, Paul; Dykes, Katherine; Lantz, Eric; Barth, Stephan; Bottasso, Carlo L.; Carlson, Ola; Clifton, Andrew; Green, Johney; Green, Peter; Holttinen, Hannele; Laird, Daniel; Lehtomäki, Ville; Lundquist, Julie K.; Manwell, James; Marquis, Melinda; Meneveau, Charles; Moriarty, Patrick; Munduate, Xavier; Muskulus, Michael; Naughton, Jonathan; Pao, Lucy; Paquette, Joshua; Peinke, Joachim; Robertson, Amy; Rodrigo, Javier Sanz; Sempreviva, Anna Maria; Smith, J Charles; Tuohy, Aidan; Wiser, Ryan (Journal article; Peer reviewed, 2019)
      Modern wind turbines already represent a tightly optimized confluence of materials science and aerodynamic engineering. Veers et al. review the challenges and opportunities for further expanding this technology, with an ...

    • Ice-induced vibrations under continuous brittle crushing for an offshore wind turbine 

      Wang, Qi (Master thesis, 2015)
      Offshore wind structures located in ice infested waters are subjected to actions from moving ice and forces are generated when a drifting ice crushes against the structure. The main purpose of this Master s thesis is to ...

    • Improved design of the support structure for the NOWITECH 10 MW Reference Turbine 

      Sandal, Kasper (Master thesis, 2014)
      The aim of this thesis is to improve the support structure for the Nowitech 10 MW reference turbine (NRT) by optimizing the thickness and diameter of legs and braces section by section. This is a so called full-height ...

    • Improved lumping of offshore wind turbine fatigue load cases 

      Koochekali, Alahyar (Master thesis, 2018)
      Stochastic environmental modelling, and structure response calculation are two major steps in determining fatigue damage for offshore wind turbines. However, there are challenges ahead of each step. First, site-specific ...

    • Influence of marine growth on support structure design for offshore wind turbines 

      Fevåg, Live Salvesen (Master thesis, 2012)
      This Master's thesis addresses the effects of marine growth on the design of a lattice tower substructure for an offshore wind turbine. Marine growth is the unwanted colonization of marine structures by marine organisms. ...

    • Influence of Soil Parameters on the Fatigue Lifetime of Offshore Wind Turbines with Monopile Support Structure 

      Schafhirt, Sebastian; Page, Ana M.; Eiksund, Gudmund Reidar; Muskulus, Michael (Journal article; Peer reviewed, 2016)
      Designing support structures for offshore wind turbines is a complex task as these are highly dynamic systems subjected to long-term cyclic loads with variable amplitude. Long-term cyclic loading may cause stiffening or ...