Blar i UiS Brage på forfatter "Jakobsen, Jasna Bogunovic"

Viser treff 21-37 av 37

    • Long-term response of a curved floating bridge to inhomogeneous wind fields 

      Morais da Costa, Bernardo; Wang, Jungao; Jakobsen, Jasna Bogunovic; Snæbjörnsson, Jonas Thor; Øiseth, Ole Andre (Peer reviewed; Journal article, 2023-07)
      A numerical model of a 5 km long curved floating bridge, planned for the Bjørnafjord, in Norway, is subjected to strong wind events with stationary mean properties that vary along the bridge axis. A Weather Research and ...

    • Measurements of Surface-Layer Turbulence in a Wide Norwegian Fjord Using Synchronized Long-Range Doppler Wind Lidars 

      Cheynet, Etienne; Jakobsen, Jasna Bogunovic; Snæbjörnsson, Jonas Thor; Mann, Jakob; Courtney, Michael; Lea, Guillaume; Svardal, Benny (Peer reviewed; Journal article, 2017)
      Three synchronized pulsed Doppler wind lidars were deployed from May 2016 to June 2016 on the shores of a wide Norwegian fjord called Bjørnafjord to study the wind characteristics at the proposed location of a planned ...

    • Modelling and Analysis of the City Bridge of Stavanger 

      Hovind, Pål Ruben (Masteroppgave/UIS-TN-IMBM/2020;, Master thesis, 2020-07)
      At the City Bridge of Stavanger, or Bybrua, there have been recorded vibrations of stay cables that does not have a clear explanation. Due to the age of the structure and this occurrence, Statens Vegvesen and University ...

    • Numerical Analysis of the Effect of Offshore Turbulent Wind Inflow on the Response of a Spar Wind Turbine 

      Putri, Rieska Mawarni; Obhrai, Charlotte; Jakobsen, Jasna Bogunovic; Ong, Muk Chen (Peer reviewed; Journal article, 2020)
      Turbulent wind at offshore sites is known as the main cause for fatigue on offshore wind turbine components. Numerical simulations are commonly used to predict the loads and motions of floating offshore wind turbines; ...

    • Observations of bridge stay cable vibrations in dry and wet conditions: A case study 

      Daniotti, Nicolo; Jakobsen, Jasna Bogunovic; Snæbjørnsson, Jonas Thor; Cheynet, Etienne; Wang, Jungao (Peer reviewed; Journal article, 2021)
      The characteristics of wind- and rain-wind-induced vibrations of bridge stay cables are studied by using ambient vibrations records acquired on a cable-stayed bridge. Mean wind speed and wind-cable angle, as well as the ...

    • Offshore wind turbine wake characteristics using scanning doppler lidar 

      Krishnamurthy, Raghavendra; Reuder, Joachim; Svardal, Benny; Fernando, Harindra Joseph S.; Jakobsen, Jasna Bogunovic (Journal article; Peer reviewed, 2017-10)
      Within an offshore wind park, wind flow characteristics are quite complex and govern both the energy production and the structural wind turbine response. An experimental study focussed on assessing the spatial variability ...

    • Recommendation on use of wind lidars 

      Reuder, Joachim; Cheynet, Etienne; Clifton, Andrew; van Dooren, Marijn Floris; Gottschall, Julia; Jakobsen, Jasna Bogunovic; Mann, Jakob; Palma, Jose; Schlipf, David; Sjøholm, Mikael; Trujillo, Juan-Jose; Thobois, Ludovic; Würth, Ines; Zasso, Alberto (Research report, 2021)
      The 15 Early Stage Researchers (ESRs) in the LIKE project investigate topics in which wind lidar play a significant role. This report provides the ESRs an introductory reading and gives a short introduction into the basic ...

    • Response sensitivity of a semisubmersible floating offshore wind turbine to different wind spectral models 

      Putri, Rieska Mawarni; Obhrai, Charlotte; Jakobsen, Jasna Bogunovic (Peer reviewed; Journal article, 2020)
      Previous research on the OC3 spar floating offshore wind turbine (FOWT) has shown the sensitivity of the yaw and side-side modes' load and motion responses to different atmospheric conditions. Using the same baseline turbine ...

    • Spectral characteristics of surface-layer turbulence in the North Sea 

      Cheynet, Etienne; Jakobsen, Jasna Bogunovic; Obhrai, Charlotte (Journal article, 2017-10)
      According to IEC 61400-1 and IEC 61400-3 standards, the wind load on the rotor-nacelle assembly of offshore wind turbines should be estimated from the Kaimal or Mann spectral models, unless site-specific full-scale ...

    • Triple-lidar measurements of wind across a virtual rotor plane over a sea surface 

      Nafisifard, Mohammad; Jakobsen, Jasna Bogunovic; Snæbjörnsson, Jonas Thor; Sjøholm, Mikael; Mann, Jakob (Peer reviewed; Journal article, 2023)
      An improved understanding of the spatiotemporal characteristics of the wind velocity field above the sea surface will benefit the design of modern offshore wind turbines. This study examines wind velocity data recorded on ...

    • Turbulence in a coastal environment: the case of Vindeby 

      Putri, Rieska Mawarni; Cheynet, Etienne; Obhrai, Charlotte; Jakobsen, Jasna Bogunovic (Journal article; Peer reviewed, 2022-08-11)
      The one-point and two-point power spectral densities of the wind velocity fluctuations are studied using the observations from an offshore mast at Vindeby Offshore Wind Farm, for a wide range of thermal stratifications of ...

    • Unfrozen Skewed Turbulence for Wind Loading on Structures 

      Cheynet, Etienne; Daniotti, Nicolo; Jakobsen, Jasna Bogunovic; Snæbjørnsson, Jonas Thor; Wang, Jungao (Peer reviewed; Journal article, 2022)
      The paper introduces an algorithm to generate a three-variate four-dimensional wind turbulence field suited for yawed wind dynamic load simulation. At large yaw angles, a relaxation of Taylor’s hypothesis of frozen turbulence ...

    • Unsteady RANS Simulations of Flow around a Twin-Box Bridge Girder Cross Section 

      Jeong, Wonmin; Liu, Shengnan; Jakobsen, Jasna Bogunovic; Ong, Muk Chen (Journal article; Peer reviewed, 2019-07)
      The aerodynamic performance of bridge deck girders requires a thorough assessment and optimization in the design of long-span bridges. The present paper describes a numerical investigation of the aerodynamic characteristics ...

    • Vortex-induced vibration (VIV) effects of a drilling riser due to vessel motion 

      Joseph, Rohan Shabu; Wang, Jungao; Ong, Muk Chen; Jakobsen, Jasna Bogunovic (Journal article; Peer reviewed, 2017)
      A marine riser undergoes oscillatory motion in water due to the vessel motions, known as global dynamic response. This to-and-fro motion of the riser will generate an equivalent flow that can cause Vortex-Induced Vibrations ...

    • Wave Influenced Wind and the Effect on Offshore Wind Turbine Performance 

      Kalvig, Siri M.; Manger, Eirik; Hjertager, Bjørn H; Jakobsen, Jasna Bogunovic (Journal article; Peer reviewed, 2014)
      In this paper the effect of wave influenced wind on offshore wind turbines is studied numerically. The wave is seen as a dynamical roughness that influences the wind flow and hence the wind turbine performance. An actuator ...

    • Wind and Vibration Measurements on the Lysefjord Bridge 

      Gullaksen, Martin Severin. (Master thesis, 2022)
      The Lysefjord Bridge is a suspension bridge located in the western part of Norway. Since 2013 it has been used as a full-scale wind engineering laboratory and is fitted with sonic anemometers, tri-axial accelerometers, ...

    • Wind coherence measurement by a single pulsed Doppler wind lidar 

      Kumer, Valerie-Marie; Cheynet, Etienne; Jakobsen, Jasna Bogunovic; Svardal, Benny; Reuder, Joachim (Journal article; Peer reviewed, 2016)
      A single pulsed Doppler wind lidar, deployed at the FINO1 platform in the North Sea, has been used to monitor the lateral and vertical coherence of the along-wind component. To maximize the sampling frequency of the ...