Search results for: UNDERWATER PIPELINE

• Underwater Wet Repair Welding of API 5L X65M Pipeline Steel

  Publication

  • G. Rogalski
  • D. Fydrych
  • J. Łabanowski

  - Polish Maritime Research - Year 2017

  This paper presents results of the research of effect of polymer insulation of pipeline made of API 5L X65M steel as well as underwater wet welding parameters on properties of joints made by covered electrodes. Effect of heat input on structure and hardness of joints during repair of underwater pipeline was analyzed. Welding defects like microcracks, micro-lacks of fusion, slag inclusions, as well as HAZ hardness increase over...

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• Theoretical analysis of a new approach to order determination for a modified Prony method in swath mapping application

  Publication

  • P. Grall
  • J. Marszal

  - HYDROACOUSTICS - Year 2017

  This article presents a new approach to determine the model order (number of principal components) in the modified Prony method applied to swath acoustic mapping. Determination of the number of principal components is a crucial step in the modified Prony method. In the proposed approach the model order is chosen based on the underlying physical model of the underwater acoustic environment, and utilised signal processing operations....

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