• Title/Summary/Keyword: Diver Boat

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Evaluation of Structural Integrity of the ISO-based Moon Pool Type Diver Boats (ISO 기반 Moon Pool형 다이버 보트 구조 건전성 평가)

  • Kang, Byoung-mo;Oh, Woo-jun;Na, Hyun-ho;Choi, Ju-seok
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.24 no.5
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    • pp.597-603
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    • 2018
  • This Study investigates the Structural Integrity of Boats for Divers, given increased demands for Underwater and Recreational use. We conducted research on a Small Catamaran with a Moon Pool in the center of the Hull, using the Finite Element Method to calculate allowable stress based on the ISO Rule. We computed the coefficients defined in ISO 12215-5 and TC118.1225-7, and determined the suitability of using the ISO Standard and Allowable Stress Design method (ASD) by applying Longitudinal Bending Moment, Torsional moment, and Bottom Slamming Load. We also applied the Ultimate Strength Design Method (LFRD) using Finite Element Analysis (FEA). As a Result of this Research, it was found that ships with a Moon Pool do have Structural Integrity according to their Design in accordance with ISO and KR Regulations.

A Study of Data Management Methods through Shake Correction of Underwater Investigation Using High Resolution Side Scan SONAR (흔들림 보정을 통한 고해상 사이드스캔소나의 데이터 관리기법 연구)

  • Yi, Jong-Hwa;Kim, Young-Seok;Park, Chul;Choi, Sang-Sik;Lee, Heung-Su
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.21 no.5
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    • pp.94-100
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    • 2017
  • In the case of the side scan sonar operated by the towing method, the underwater structure electric jig was developed because there is a difficulty in the cross-sectional survey that the user wants when conducting the survey. However, in the case of the sound wave photographing method using the electric jig, since the boat and the sonar behaves as one body, data distortion has occurred due to various problems according to working environment, such as, the rolling phenomenon of the boat due to the wave and the fluctuation of the sonic image due to the inoperability of the boat driver. Therefore, in order to solve the image blurring caused by the operation of the equipment for underwater survey of the existing side scan sonar, in this research, the program was supplemented to enable the shake correction by attaching the shake correction sensor and developing the shake correction algorithm. In order to verify the improvement of the sonar data resolution, the sonic images before and after the shake correction were collected through on-site investigation and the analysis of the sonic image data acquired by a diver measuring the actual damage length and depth. This study is expected to contribute to the development of sonar imaging technique of the underwater surface of the structure and bed surface of the sea or a river using the side scan sonar in the future.