Browsing NTNU Open by Author "Liu, Zhenhui"

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    • Analytical and numerical analysis of iceberg collisions with ship structures 

      Liu, Zhenhui (Doktoravhandlinger ved NTNU, 1503-8181; 2011:235, Doctoral thesis, 2011)
      The scope of the present Ph.D. thesis was to investigate the mechanics of collisions between icebergs and ship structures. Large reservoirs of oil and gas and new sailing routes in the Arctic area are two large motivations ...

    • Application of machine learning to ILI data denoising 

      Dahl, Sondre Strande; Larsen, Erik Stensrud (Master thesis, 2021)
      Dette prosjektet har som mål å anvende maskinlæring i filtreringsprosessen av data fra inline-inspeksjon (ILI) av olje- og gassrørledninger. Rørledningen er utsatt for korrosjon, både innvendig og utvendig. Konsekvensene ...

    • Application of machine learning to ILI datadenoising 

      Dahl, Sondre Strande; Larsen, Erik Stensrud (Master thesis, 2021)
      Dette prosjektet har som mål å anvende maskinlæring i filtreringsprosessen av data fra inline-inspeksjon (ILI) av olje- og gassrørledninger. Rørledningen er utsatt for korrosjon, både innvendig og utvendig. Konsekvensene ...

    • Assessment of VIV fatigue of subsea template jumper by using a time domain model 

      Sieber, L.; Sævik, Svein; Ringsberg, J. W.; Liu, Zhenhui (Chapter, 2021)
      This paper addresses the application of a time domain model for Vortex-Induced Vibration (VIV) to assess the fatigue damage of subsea jumpers. The time domain model, capable of accounting for structural non-linearity and ...

    • Discussion of assumptions behind the external dynamic models in ship collisions and groundings 

      Yu, Zhaolong; Liu, Zhenhui; Amdahl, Jørgen (Journal article; Peer reviewed, 2019)
      In the past decades, a prevailing way for the assessment of responses in ship collisions and groundings has been to decouple the problem into two parts: external dynamics and internal mechanics. The external dynamics deals ...

    • Estimation of ship bow-iceberg impact forces with consideration of the sliding effect 

      Song, Ming; Liu, Zhenhui; Amdahl, Jørgen (Journal article; Peer reviewed, 2018)
      A simplified method to estimate the impact force in ship bow-iceberg collisions is presented. The eccentricities of both iceberg and ship are included. The friction at the contact point is also included so that the sliding ...

    • On multi-planar impact mechanics in ship collisions 

      Liu, Zhenhui; Amdahl, Jørgen (Peer reviewed; Journal article, 2019)
      This paper presents a new solution for ship impact dynamics in multi-planar space. A collision matrix is presented. It is derived on the basis of impact dynamics for rigid bodies. Effective mass factors are introduced ...

    • A simple machine learning based framework for processing the inline inspection data of subsea pipelines 

      Liu, Zhenhui; Dahl, Sindre S.; Larsen, E. S.; Yang, Zhirong (Peer reviewed; Journal article, 2021)
      This paper presents a simple machine learning based framework for diagnosing the inline inspection data (ILI) of subsea pipelines. ILI data are obtained by intelligent pigging devices operating along subsea pipelines. The ...

    • Simulation of shipping container impact with bridge girders 

      Sha, Yanyan; Liu, Zhenhui; Amdahl, Jørgen; Dørum, Cato (Chapter, 2020)
      One of the challenges in bridge design is to ensure bridge girder integrity under accidental collision loads induced by the superstructures of drifting ships. Such accidents can happen either during earthquakes or tsunami ...

    • VIV fatigue of rigid spool for subsea template by a time domain model 

      Sieber, Linda (Master thesis, 2020)
      Subsea spools and jumpers are commonly placed close to the seabed where they are exposed to low velocity currents. These currents lead to vortex induced vibrations (VIV) in in-line (IL) and cross-flow (CF) direction. VIV ...