Wyniki wyszukiwania dla: SEABES

• On the modelling of aerodynamic force coefficients for over-shroud seals of turbine stages

  Publikacja

  • W. Włodarski
  • K. Kosowski

  - Polish Maritime Research - Rok 2009

  This paper presents experimental investigations which made it possible to determine dynamic coefficients of labyrinth over-shroud seal of a model air turbine. The coefficients associate pressure forces with turbine rotor displacement, velocity and acceleration respective to turbine casing (linear model) and play important role in analyzing turbine-set dynamics. The obtained results indicated that involving serious errors can be...

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• Journal of Physics : Conference Series

  Czasopisma

  ISSN: 1742-6588 , eISSN: 1742-6596

• IOP Conference Series: Materials Science and Engineering

  Czasopisma

  ISSN: 1757-8981

• Seabed classification using multibeam echosounder

  Publikacja

  • Z. Łubniewski
  • A. Chybicki

  - Rok 2008

  The method of seabed identification and classification from multibeam sonar echoes is presented. The proposed approach is based on calculation of a set of parameters of an echo envelope, similarly as in seafloor classification using single beam echosounder. These parameters are extracted for each consecutive beam allowing the estimation of their dependence on the seafloor incident angle. The relation between seabed type and calculated...

• Numerical modeling of wave-seabed-structure interaction.

  Publikacja

  • L. Bierawski

  - Rok 2004

  Praca doktorska przedstawia propozycję nowoczesnego rozwiązania obciążeń hydraulicznych przy uwzględnieniu nieliniowych oddziaływań pomiędzy falą wodną, przepuszczalnym dnem i porowatą konstrukcją morską. Nabrzeże pionowe, falochron podwodny i falochron kompozytowy były obiektem eksperymentów numerycznych, których wyniki były weryfikowane przy użyciu wyników laboratoryjnych (niszczących i nieniszczących). Krótki przegląd bieżącej...

• Static Series and Shunt-series PE Voltage-quality Controllers

  Publikacja

  • R. Strzelecki
  • D. Wojciechowski
  • G. Benysek

  - Rok 2007

  As presented in the Chap. 7 static shunt power electronics (PE) voltage-quality controllers protect the utility electrical system from the unfavorable impact of customer loads. Shunt controllers, as shown in Chap. 6, are recommended mainly for mitigation of the causes of disturbances, and not their effects in distanced nodes of a power-electronics system. In the case when reduction of disturbances effects is required, which leads...

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• Seabed characterisation using spectral moments of the echo signal

  Publikacja

  • J. Tęgowski
  • Z. Łubniewski

  - ACTA ACUSTICA UNITED WITH ACUSTICA - Rok 2002

  Zbadano użyteczność zastosowania momentów spektralnych obwiedni echa w rozpoznawaniu i klasyfikacji dna morskiego. Przeprowadzono obliczenia momentów spektralnych dla około 15000 ech od dna zarejestrowanych w rejonie Bałtyku Południowego i potwierdzono tezę, że wartości tych momentów skorelowane są silnie z typem dna i rodzajem osadów.

• The Imaging of Gdansk Bay Seabed by Using Side Sonar

  Publikacja

  • G. Grelowska
  • E. Kozaczka
  • D. Witos-Okrasińska
  • W. Szymczak

  - Polish Maritime Research - Rok 2018

  This paper is mainly aimed at presentation of an impact of environmental conditions on imaging accuracy by using hydro-acoustic systems in waters of a high non-uniformity of spatial distribution of hydrological parameters. Impact of refraction on erroneous estimation of range, in case of wave radiation into water under a large angle, like in side sonars or multi-beam echo-sounders, is especially important. In this paper seasonal...

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• The Examination of the Upper Layers of the Seabed by the Means of the Acoustic Methods

  Publikacja

  • E. Kozaczka
  • G. Grelowska
  • W. Szymczak
  • S. Kozaczka

  - ACTA PHYSICA POLONICA A - Rok 2011

  Propagation of acoustic waves in the sea, in particular in shallow sea, depends on several factors. The basic of them are source power and frequency of acoustic waves, spatial distribution inhomogeneous medium in which acoustic wave propagates, and distributions of speed of sound and density of seawater. The coastal conditions, which limit water medium from above (free surface of the sea) and from bottom (the seabed), are no less...

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• Automatic classification and mapping of the seabed using airborne LiDAR bathymetry

  Publikacja

  • Ł. Janowski
  • P. Tysiąc
  • R. Wróblewski
  • M. Rucińska
  • A. Kubowicz- Grajewska

  - ENGINEERING GEOLOGY - Rok 2022

  Shallow coastal areas are among the most inhabited areas and are valuable for biodiversity, recreation and the economy. Due to climate change and sea level rise, sustainable management of coastal areas involves extensive exploration, monitoring, and protection. Current high-resolution remote sensing methods for monitoring these areas include bathymetric LiDAR. Therefore, this study presents a novel methodological approach to assess...

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