• Title/Summary/Keyword: Yaw checking ability

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A Simulator Study on Yaw-checking and Coursekeeping Ability in IMO's Ship Manoeuvrability Standards

  • Sohn, Kyoung-Ho;Yang, Seung-Yeul;Lee, Dong-Sub
    • Journal of Ship and Ocean Technology
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    • v.6 no.3
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    • pp.26-36
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    • 2002
  • Yaw-checking and course-keeping ability in IMO's ship rnanoeuvrability standards is reviewed from the viewpoint of safe navigation. Three kinds of virtual series-ships, which have different course instability, are taken as test models. The numerical simulation on Z-test is carried out in order to examine the correlation between known manoeuvrability in spiral characteristics and various kinds of overshoot angle. Then simulator experiments are executed with series-ships in a curved, narrow waterway by five pilots in order to examine the correlation between known manoeuvrability and degree of manoeuvring difficulty. IMO criteria for yaw-checking and course-keeping ability are discussed and new criteria are proposed.

A Study on Yaw-checking and Course-keeping Ability of Directionally Unstable Ships

  • Sohn, Kyoung-Ho;Yang, Seung-Yeul;Lee, Dong-Sub;Bae, Jun-Young
    • Journal of Navigation and Port Research
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    • v.27 no.6
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    • pp.631-638
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    • 2003
  • Yaw-checking and course-keeping ability in IMO's ship manoeuvrability standards are reviewed from the viewpoint of safe navigation. Three kinds of virtual series-ships, which have different course instability, are taken as test models. The numerical simulation on Z-test is carried out in order to examine the correlation between known manoeuvrability in spiral characteristics and various kinds of overshoot angle. Then simulator experiments are executed with series-ships in a curved, narrow waterway by six operators(five active pilots and one ex-captain) in order to examine the correlation between known manoeuvrability and degree of manoeuvring difficulty. IMC criteria for yaw-checking and course-keeping ability are discussed and revised criteria are proposed.

선박의 조종성능과 조종곤란도의 상관관계 분석을 위한 협수로 항행 실시간 시뮬레이션

  • 손경호;양승렬;김용민;배준영;김진국;이동섭
    • Proceedings of the Korea Society for Simulation Conference
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    • 2002.05a
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    • pp.3-10
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    • 2002
  • Yaw-checking and course-keeping ability in IMO's ship manoeuvrability standards is reviewed from the viewpoint of safe operation. Three types of assumed series-ships, which have systematically different instability on course, are taken as tested models. The numerical simulation on Z-test is carried out in order to examine the correlation between known manoeuvrability and various kinds of overshoot angle. Then simulator experiments are executed with series-ships in situation of curved, narrow of waterway by five pilots in order to examine the correlation between known manoeuvrability and degree of manoeuvring difficulty. Three kinds of IMO's criterion concerning yaw-checking and course-keeping ability are discussed and new criteria are proposed.

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A Simulator Study on Yaw-checking and Course-keeping Ability of Directionally Unstable Ships (침로불안정한 선학의 변침 및 보침 성능에 관한 시뮬레이터 연구)

  • Sohn Kyoungho;Lee Dongsub
    • Proceedings of KOSOMES biannual meeting
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    • 2003.11a
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    • pp.141-148
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    • 2003
  • Yaw-checking and course-keeping ability in IMO's ship manoeuvrability standards is reviewed from the viewpoint cf sole navigation Three kinds of virtual series-ships, which have different course instability, are taken as test models. The numerical simulation on Z-test is carried out in order to examine the correlation between known manoeuvrability in spiral characteristics and various kinds of overshoot angle. Then simulator experiments are executed with series-ships in a curoed, narrow waterway by six operators(five active pilots and one ex-captain) in order to examine the correlation between known manoeuvrability and degree of manoeuvring difficulty. IMO criteria for yaw-checking and course-keeping ability are discussed and revised criteria are proposed.

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Maneuvering character of hull form renovated tuna purse seiner (선형개조 선망선의 조종성능)

  • Hong, Jin-Keun;Kang, Il-Kwon;Jeong, Seong-Jae
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.51 no.1
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    • pp.61-70
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    • 2015
  • In an attempt to improve the maneuvering character of hull form renovated tuna purse seiner. A renovation was carried out on the 3 tuna purse seiner fishing vessel. To grasp the progress of maneuvering and resistance on ship B (730 ton class), new bulbous bow was only attached. The ship A (740 ton class) and C (600 ton class) were modified for new bulbous bow, enlarged slipway and rudder. And then the zigzag and the turning test were carried out. According to the turning test, the advance and the tactical diameter were improved very much for the modified ship. The sea trial was carried out for the original and modified ship A. It is showed that the results of sea trial corresponded with that of the tank test on the whole. In the result of the zigzag test on ship B, the turning ability was improved very much, but the yaw checking ability was deteriorated in just some degree. In the result of the zigzag test on ship C, the turning ability and yaw checking ability were remarkably improved. Ship C was greatly improved among the three ships for the maneuvering character of modified hull form.

Analysis of the dynamic characteristics for the change of design parameters of an underwater vehicle using sensitivity analysis

  • Jeon, Myungjun;Yoon, Hyeon Kyu;Hwang, Junho;Cho, Hyeon Jin
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.10 no.4
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    • pp.508-519
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    • 2018
  • In order to design the hull form of an underwater vehicle in the conceptual design phase, the dynamic characteristics depending on the hull form parameters should be identified. Course-keeping stability, turning ability, yaw-checking ability, and mission competence are set to be the indices of the dynamic characteristics, and the geometric parameters for the bare hull and rudder are set to be the hull form design parameters. The total sensitivity of the dynamic characteristics with respect to the hull form parameters is calculated by the chain rule of the partial sensitivity of the dynamic characteristics with respect to the hydrodynamic coefficients, and the partial sensitivity of the hydrodynamic coefficients with respect to the hull form parameters. Based on the sensitivity analysis, important hull form parameters are selected, and those optimal values to satisfy the required intercept time of mission competence of a specific underwater vehicle and turning rate are estimated.

Estimation of the manoeuvrability of the KVLCC2 in calm water using free running simulation based on CFD

  • Kim, In-Tae;Kim, Cheolho;Kim, Sang-Hyun;Ko, Donghyeong;Moon, Seong-Ho;Park, Hwanghi;Kwon, Jaewoong;Jin, Bongyong
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.13 no.1
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    • pp.466-477
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    • 2021
  • There are three different well-known methods for predicting the manoeuvrability of ships: (1) free running model test, (2) direct manoeuvring simulation using CFD and (3) system-based manoeuvring simulation. In this paper, the manoeuvrability of the KVLCC2 was estimated using CFD with rigid body motion and body force propeller method. The free running manoeuvre at the different time steps were also simulated. The yaw checking ability and the turning ability of KVLCC2 were predicted using CFD and could have been confirmed that the IMO criteria was satisfied. When the results were compared with the model test and system-based method, the free running simulation showed better agreement to that of the model test. It could also be confirmed that the results vary depending on the time step. Overall, the CFD results using the body force propeller method estimated most accurately the test results.

A Numerical Study on the Effects of Maneuverability of Ship with Low Forward Speed by Increasing Rudder Force (타력 증대가 저속 운항 선박의 조종성능에 미치는 영향에 관한 수치적 연구)

  • Kim, Hyun-Jun;Kim, Sang-Hyun;Kim, Dong-Young;Kim, In-Tae;Han, Ji-Soo
    • Journal of the Society of Naval Architects of Korea
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    • v.53 no.3
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    • pp.217-227
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    • 2016
  • Recent accidents of crude oil tankers have resulted in sinking, grounding of vessels and significant levels of marine pollution. Therefore, International Maritime Organization (IMO) has been strengthening the regulations of ship maneuvering performance in MSC 137. The evaluation of maneuvering performance can be made at the early design stage; it can be investigated numerically or experimentally. The main objective of this paper was to investigate the maneuvering performance of a VLCC due to the increase of rudder force at an early design stage for low speed in shallow water conditions. It was simulated in various operating condition such as deep sea, shallow water, design speed and low speed by using the numerical maneuvering simulation model, developed using MMG maneuvering motion equation and KVLCC 2 (SIMMAN 2008 workshop). The effect of increasing the rudder force can be evaluated by using numerical simulation of turning test and ZIG-ZAG test. The research showed that, increasing the rudder force of a VLCC was more effective on improving the turning ability than improving the course changing ability especially. The improvement of turning ability by the rudder force increasing is most effective when the ship is sailing in shallow water at low forward speed.