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Search: L773:9781509052783

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1.
  • Aihara, Aya, et al. (author)
  • Vortex induced vibration energy extraction modeling via forced versus free vibration
  • 2017
  • In: Proceedings Of Oceans 2017 - Aberdeen. - : IEEE. - 9781509052790 - 9781509052783 - 9781538621110
  • Conference paper (peer-reviewed)abstract
    • Vortex induced vibrations (VIV) for energy extraction have been revisited in last years by both marine power and wind power communities. Even though vortex induced vibrations have been focus of research for many years, energy extraction from vortex induced vibrations is relevantly new field which needs more detailed investigation and modeling. To this end, there has been recent experimental and modeling parametric studies where VIV was modeled by solution of one-degree-of-freedom ordinary differential equation spring system where engineering modeling of vortex induced vibration for energy extraction has been investigated based on a spring system with the forces defined from forced oscillation experiments where full coupling of free oscillations were not taken into account. Herein a Computational Fluid Dynamics (CFD) modeling of a circular cylinder will be studied to compare forced and free vibrations in the context of vortex-induced energy extraction. The model is essentially solved by partial differential isothermal incompressible Navier-Stokes equations to model fully mathematical model of the fluid-structure interaction of vortex induced vibration. The comparison between forced and free oscillation response studies of this paper will serve to improve the scientific knowledge where vortex induced vibration modeling are comparatively more limited. The preliminary results are presented herein for forced and free oscillations for the Reynolds number regimes Re = 100 and Re = 3800 in two dimensions for combinations of amplitudes and frequency of oscillations in the context of energy extraction modeling.
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2.
  • Al-Rawi, Mohammed, et al. (author)
  • Algorithms for the Detection of First Bottom Returns and Objects in the Water Column in Side-Scan Sonar Images
  • 2017
  • In: OCEANS '17 A Vision for our Marine Future OCEANS '17. - Aberdeen, United Kingdom. - 9781509052783
  • Conference paper (peer-reviewed)abstract
    • Underwater imaging has become an active research area in recent years as an effect of increased interest in underwater environments and is getting potential impact on the world economy, in what is called blue growth. Since sound propagates larger distances than electromagnetic waves underwater, sonar is typically used for underwater imaging. One interesting sonar image setting is comprised of using two parts (left and right) and is usually referred to as sidescan sonar. The image resulted from sidescan sonars, which is called waterfall image, usually has to distinctive parts, the water column and the image seabed. Therefore, the edge separating these two parts, which is called the first bottom return, is the real distance between the sonar and the seabed bottom (which is equivalent to sensor primary altitude). The sensory primary altitude can be measured if the imaging sonar is complemented by interferometric sonar, however, simple sonar systems have no way to measure the first bottom returns other than signal processing techniques. In this work, we propose two methods to detect the first bottom returns; the first is based on smoothing cubic spline regression and the second is based on a moving average filter to detect signal variations. The results of both methods are compared to the sensor primary altitude and have been successful in 22 images out of 25.
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3.
  • Tengberg, Anders, 1962, et al. (author)
  • Sustainable management of oil polluting wrecks and chemical munitions dump sites
  • 2017
  • In: OCEANS 2017 - ABERDEEN. - 0197-7385. - 9781509052783 ; 2017-October
  • Conference paper (peer-reviewed)abstract
    • Dumped chemical weapons that are corroding and exposed to the marine environment can cause contamination and health risks for marine fauna and humans. This paper describes some of the work that is done in the EU-DAIMON (Decision Aid for Marine Munitions) project including the development of a decision support method and previous field results that indicate that bottom trawling re-suspend sediments and spread contaminants and that recently caught fish at the Maseskar dump site contains detectable concentrations of chemical weapons from World War II.
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