Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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A Study on the Hull Acceleration Analysis of Car Ferry Ship for Securing Safety Evaluation

고박안전성 평가를 위한 카페리선박의 선체가속도 분석에 관한 연구

  • Yu, Yong Ung (Graduate school of Korea Maritime and Ocean University) ;
  • Lee, Yun-Sok (Department of Ship Operation, Korea Maritime & Ocean University)
  • 유용웅 (한국해양대학교 대학원) ;
  • 이윤석 (한국해양대학교 선박운항과)
  • Received : 2020.09.14
  • Accepted : 2020.10.28
  • Published : 2020.10.31
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Abstract

The securing safety of ferry ships on the domestic coast is evaluated by comparing the external force applied and the securing device based on the cargo weight and hull acceleration that can exist at the loaded position. The hull acceleration based on the domestic standard, which is the basis for securing safety evaluation, is applied without reflecting the characteristics of the ship and the sailing conditions. In this study, a total of 12 acceleration measurements were performed at four points of the hull of a ship with a DWT 6,800 ton class 15.5 knots passing through Busan-Jeju to analyze the hull acceleration of the domestic coastal ferry ship. Data were collected for the buoy. For a theoretical comparative analysis of the limited measurement results, the response amplitude operator (RAO) was analyzed through frequency-response analysis by numerical simulation, and acceleration analysis for the four points was performed using the RAO results. Based on the acceleration comparison, differences in the degree of each position were observed, but in the case of the Y-axis acceleration, the analysis was 1.81 m/s2, and the measurement was 1.47 m/s2. The analyzed simulation result was as high as 0.34 m/s2. Moreover, analysis was performed at 22 % level, and measurement at 18 % level.

국내 연안의 카페리선박의 고박안전성은 화물의 중량과 적재된 위치에서 발생할 수 있는 선체가속도를 기반으로 한 작용 외력과 고박장치의 고박력 비교를 통해 평가하고 있다. 고박안전성 평가에 기본이 되는 국내 기준상의 선체가속도는 선박의 특성 및 항해조건의 반영이 없이 적용되고 있다. 본 연구에서는 국내 연안 카페리선박의 선체가속도를 분석하고자 부산-제주를 통항하는 DWT 6,800톤급 선속 15.5 knots의 선박을 기준으로 선체의 4개 지점에서 총 12회의 가속도 계측을 수행하였고, 항해구역 인근 기상관측 부이의 데이터를 수집하였다. 한정된 계측 결과에 대한 이론적 비교 분석을 위하여 수치 시뮬레이션을 통하여 주파수 응답 해석을 통한 RAO를 해석하였고, RAO 결과를 바탕으로 4개 지점에 대한 가속도 해석을 수행하였다. 가속도 비교 결과 위치별 정도의 차이는 있으나 Y축 가속도의 경우 해석 1.81 m/s2, 계측 1.47 m/s2로 해석 시뮬레이션 결과가 0.34 m/s2 높게 분석되었고, 고박안전성 평가기준 8.59m/s2와 비교해 볼 때 해석은 22 % 수준, 계측은 18 % 수준으로 분석되었다.

Keywords

References

  1. Choung, J. M, H. S. Jo, K. H. Lee, and Y. W. Lee(2016a), Study on Structural Safety of Car Securing Equipment for Coastal Carferry: Part I Estimation of Hull Acceleration using Direct Load Approach, Journal of Ocean Engineering and Technology, Vol. 30, No. 6, pp. 440-450. https://doi.org/10.5574/KSOE.2016.30.6.440
  2. Choung, J. M., H. S. Jo, K. H. Lee, and Y. W. Lee(2016b), Study on Structural Safety of Car Securing Equipment of Coastal Carferry: Part II Assessment of Lashing Safety according to Acceleration Prediction Approaches, Journal of Ocean Engineering and Technology, Vol. 30, No. 6, pp. 451-457. https://doi.org/10.5574/KSOE.2016.30.6.451
  3. Hwang, J. W., S. G. Yang, C. Y. Hong, and J. W. Park(2004), Development of Lashing Analysis Simulator for Container Vessel. Proceedings of 2004 Spring Conference of the Korean Society of Ocean Engineers, pp. 90-95.
  4. IMO(2011), International Maritime Organization, Code of Safe Practice for Cargo Stowage and Securing, Annex 13, pp. 3-13.
  5. IMO(2018a), International Maritime Organization, Sub- Committee on Carriage of Cargoes and Containers, 5th session, Agenda item 7.
  6. IMO(2018b), International Maritime Organization, Sub- Committee on Carriage of Cargoes and Containers, 6th session, Agenda item 7.
  7. Kang, B. S., C. H. Jung, and D. B. Kim(2020), A Study on Lashing Standards for Car Ferry Ships Sailing in Smooth Sea Areas, Journal of the Korean Society of Marine Environment & Safety Vol. 26, No. 1, pp. 1-7. https://doi.org/10.7837/kosomes.2020.26.1.001
  8. Kim, D. H., S. M. Lee, and G. Y. Kong(2013), A Study on the Wireless Ship Motion Measurement System Using AHRS, J. Navig. Port Res., Vol. 37, No. 6, pp. 575-580. https://doi.org/10.5394/KINPR.2013.37.6.575
  9. Lee, H. J. and W. T. Lee(2019), AHRS Development with MEMS and using 6-Axes Motion, The Society for Aerospace System Engineering 2019 Spring Conference, pp. 1-4.
  10. MOF(2018) Standards for cargo loading and securing, etc. Retrieved from http://www.mof.go.kr/, on September 23.
  11. Turnbull, S. R. and D. Dawson(1997), The Securing of Rigid Semi-Trailers on Roll-on/Roll-off Ships. Journal of Mechanical Sciences, Vol. 39, No. 1, pp. 1-14. https://doi.org/10.1016/0020-7403(96)00021-5