• Title/Summary/Keyword: 조종성능시험

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Study on the Maneuverability of Barge by Captive Model Test (구속모형실험을 통한 부선의 조종성능 추정)

  • Yun, Kun-Hang;Kim, Yeon-Gyu
    • Journal of Navigation and Port Research
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    • v.36 no.8
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    • pp.613-618
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    • 2012
  • For the tug-barge simulation, captive model test(Horizontal Planar Motion Mechanism) of the barge model is carried out. From the result of HPMM test, a resistance coefficient, maneuvering coefficients of the barge are obtained. A mathmatical model of the barge is validated by turning simulations with different angle of towing line applied a simple towing line model and the tactical diameter compared to sea trial data. As a result, the tactical diameter of the barge is smaller as the angle of towing line is bigger. The tactical diameter from simulations is smaller than that from sea trial data, may be caused by increased displacement of the barge.

Study on the Manoeuvring Characteristics of a Ship with Stern Bulb (선미벌브를 갖는 선박의 조종특성에 관한 연구)

  • Kyoung-Ho Sohn;Gyoung-Woo Lee
    • Journal of the Society of Naval Architects of Korea
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    • v.31 no.3
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    • pp.65-79
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    • 1994
  • In the present paper, An emphasis is laid upon effects of stern bulb on hydrodynamic property and manoeuvring performance. We carried out captive model tests in circulating water channel with two ship models of which the frame lines of aft bodies are different. such as normal stern form and stern form with bulb, but of which the other parts are exactly same. The tests conducted consist of hull resistance test, effective thrust measurement, oblique tow test, and measurements of factors related to rudder force. From the results of model tests, we discussed effects of stern bulb on hull forces and on hull-propeller-rudder interactions, comparing with normal stern form. Furthermore, we also discussed effects of stern bulb on course stability. turning ability. spiral characteristics and zig-zag manoeuvre by computer simulation. As a result, it is clarified that the adoption of stern bulb makes course stability the worse and turning ability the better. The difference of the hydrodynamic derivatives of naked hull between two ship forms cause the worse course stability of the ship with stern bulb. The differences of the effective inflow velocity to rudder and hull forces induced by steered rudder cause the better turning ability of the ship with stern bulb.

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A Study on Practical PMM Test Technique for Ship Maneuverability Using System Identification Method (선박의 조종성능 추정에 있어서 시스템식별법을 이용한 PMM 시험 기법에 대한 연구)

  • 이태일;권순홍
    • Journal of Ocean Engineering and Technology
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    • v.16 no.6
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    • pp.25-31
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    • 2002
  • A system identification method is introduced to increase the prediction accuracy of a ship's maneuverability in PMM test, analysis. To improve the accuracy of linear hydrodynamic coefficients, the analysis techniques of pure sway and yaw tests are developed, and confirmed. In the analysis of sway tests, accuracy to linear hydrodynamic coefficients depends on the frequency of sway motion. To obtain nonlinear hydrodynamic coefficients for large drift angles, a combined yaw test is introduced. Using this system identification method, runs of PMM test can be reduced while retaining sufficient accuracy, compared to the Fourier integration method. Through the comparisons with sea trial results and the Fourier integration method, the accuracy and efficiency of the newly proposed system identification method, based on least square method, has been validated.

Estimation of a 9.77 G/T Small Fishing Vessel's Operating Performance Depending on Forward Speed Based on 3-DoF Captive Model Tests (9.77톤급 소형어선의 3자유도 구속모형시험을 통한 선속 별 운항성능 추정)

  • Dong-Jin Kim;Haeseong Ahn;Kyunghee Cho;Dong Jin Yeo
    • Journal of Navigation and Port Research
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    • v.47 no.6
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    • pp.305-314
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    • 2023
  • In this study, a mathematical model of a 9.77 G/T small fishing vessel was established based on captive model tests. The powering and manoeuvring performances of the vessel in the harbor and coastal sea were focused on, so captive model tests were conducted up to the full-scale speed of 8 knots. Propeller open water, resistance, and self-propulsion tests of a 1/3.5-scaled model ship were performed in a towing tank, and the full-scale powering performance was predicted. Hydrodynamic coefficients in the mathematical model were obtained by rudder open water, horizontal planar motion mechanism tests of the same model ship. In particular, in static drift and pure yaw tests which were conducted at a speed of 2 to 8 knots, the linear hydrodynamic coefficients varied with the ship speed. The effect of the ship speed on the linear coefficients was considered in the mathematical model, and manoeuvring motions, such as turning circles and zig-zags, were simulated with various approach speeds and analyzed.

Development of the Liquid Rocket Engine of 400Ib Thrust (추력 400 파운드급 액체 로켓엔진 개발)

  • 채연석;윤웅섭;이수용;김영목;오승협;최장섭;우유철;김영수
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 1995.11a
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    • pp.49-55
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    • 1995
  • 이원 액체추진제를 사용하는 인공위성용 로켓 추진기관의 개발을 위한 핵심부품별 개념 및 상세설계, 성능해석, 성능실험용 시작품의 제작, 수류 성능실험 및 지상 연소시험이 수행되었다. 인공위성 궤도조종용 로켓 추진기관은 1.38MPa의 연소실 압력으로 4초동안 1780N(400$Ib_f$)의 평균추력을 내도록 설계되었으며, 산화제로는 질산, 연료로는 트리 에틸렌 아민(triethylene amine, TEA)과 자이리딘(xylidine)의 혼합물로 구성된 접촉발화형 이원 액체추진제를 사용하고, 추진제를 가압방식에 의해 연소실에 분사하는 방법으로 분사충돌, 미립화, 그리고 기화 후 연소시키게 된다. 효율적인 설계를 위하여 설계전용 소프트웨어를 개발하였으며, 추진기관의 핵심부품별로 유동 시뮬레이션을 수행하고, 해석결과와 수류 실험결과를 바탕으로 설계를 수정, 보완하였다. 지상 연소시험 및 수류 성능실험을 위하여 추진제 공급장치 및 계측 시스템이 설계, 제작되었고, 시스템의 작동 및 자료처리를 위한 소프트웨어를 개발하여 수류 성능실험 및 지상 연소시험에 사용하였으며, 연소시험결과 지상 평균추력 378$Ib_f$를 발생하였다.

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Prediction of Ship Manoeuvring Performance Based on Virtual Captive Model Tests (가상 구속모형시험을 이용한 선박 조종성능 평가)

  • Sung, Young Jae;Park, Sang-Hun
    • Journal of the Society of Naval Architects of Korea
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    • v.52 no.5
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    • pp.407-417
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    • 2015
  • For the more accurate prediction on manoeuvring performance of a ship at initial design phase, bare hull manoeuvring coefficients were estimated by RANS(Reynolds Averaged Navier-Stokes) based virtual captive model tests. Hydrodynamic forces and moment acting on the hull during static drift and harmonic oscillatory motions were computed with a commercial RANS code STAR-CCM+. Automatic and consistent mesh generation could be implemented by using macro functions of the code and user dependency could be greatly reduced. Computed forces and moments on KCS and KVLCC 1&2 were compared with the corresponding measurements from PMM(Planar Motion Mechanism) tests. Quite good agreement can be observed between the CFD and EFD results. Manoeuvring coefficients and IMO standard manoeuvres estimated from the computed data also showed reasonable agreement with those from the experimental data. Based on these results, we could confirm that the developed virtual captive manoeuvring model test process could be applied to evaluate manoeuvrability of a ship at the initial hull design phase.

A Study on the Manoeuvrability of KVLCC2 in Shallow Water by Free Running Model Test (자유항주모형시험을 이용한 KVLCC2 선형의 천수영역에서의 조종성능에 관한 연구)

  • Yun, Kunhang;Yeo, Dong Jin;Park, Byoungjae
    • Journal of the Society of Naval Architects of Korea
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    • v.52 no.6
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    • pp.494-500
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    • 2015
  • It has been reported that a ship sailing in shallow water possesses better straight-line stability due to the change of fluid flow around the ship. This tendency affects manoeuvring characteristics of the ship. To investigate this phenomenon, indoor free running model test(FRMT) on KVLCC2 was carried out in three water depth conditions(H/T = 1.2, 1.5 & 2.0). Turning circle tests(± 35° ) and zigzag tests(± 20° /5° and ± 20° /10° ) were conducted with newly developed indoor FRMT system, and the manoeuvring results were compared with test results from other institutes. As the water depth decreased, the yaw rate of the ship decreased, and the distances of circular trajectories at the same heading angle increased in the turning circle tests. The first overshoot angles of the zigzag tests decreased. From both tests, the time for course change increased as the water depth decreased. These manoeuvring characteristics show that KVLCC2 in shallow water becomes more stable in terms of straight-line stability.

Prediction of Maneuverability of KCS with 4 Degrees of Freedom (KCS 선형의 4자유도 조종성능 추정)

  • Kim, Yeon-Gyu;Yeo, Dong-Jin;Son, Nam-Sun;Kim, Sun-Young;Yun, Kun-Hang;Oh, Byeong-Ik
    • Journal of the Society of Naval Architects of Korea
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    • v.48 no.3
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    • pp.267-274
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    • 2011
  • This paper presents the results of prediction of maneuverability of KCS about 4 degree of freedom(DOF) including roll motion. The prediction is carried out by CPMC captive model test. The CPMC(Computerized Planar Motion Carriage) with captive model test equipment including roll moment gage is installed at Ocean Engineering Tank of MOERI. KCS is the container ship open to the world by MOERI. To predict the 4 DOF maneuverability of a ship some tests with roll angle are conducted. And the prediction results of maneuverability by simulation are compared with the results of free running model test. The simulation results agree well with those of free running model tests.

Prediction of Maneuverability of KCS by CPMC Captive Model Test (CPMC 구속모형시험에 의한 KCS 선형의 조종성능 추정)

  • Kim, Yeon-Gyu;Yeo, Dong-Jin;Kim, Sun-Young;Yun, Kun-Hang;Oh, Byeong-Ik
    • Journal of the Society of Naval Architects of Korea
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    • v.46 no.6
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    • pp.553-561
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    • 2009
  • This paper presents the results of prediction of maneuverability of KCS by CPMC captive model test. The CPMC(Computerized Planar Motion Carriage) with captive model test equipment is installed at Ocean Engineering Tank of MOERI. KCS is the container ship which was open to the world by MOERI. And the test results for the prediction of maneuverability were presented by NMRI in Japan. The research results about the maneuverability of KCS were presented at SIMMAN 2008 Workshop in Denmark. The results of test and simulation of this paper are compared with the results of simulation by MOERI using test results of NMRI and simulation results by NMRI.

An Experimental Study on the Manoeuvrability of KCS with Different Scale Ratios by Free Running Model Test (자유항주모형시험을 이용한 KCS 선형의 축척비별 조종성능에 관한 연구)

  • Yun, Kunhang;Choi, Hujae;Kim, Dong Jin
    • Journal of the Society of Naval Architects of Korea
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    • v.58 no.6
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    • pp.415-423
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    • 2021
  • There have been many experimental studies on the manoeuvrability of KRISO Container Ship (KCS). However, the scale ratio of the model ship and the test procedure for each institute are slightly different, so direct comparison for the data is technically difficult to perform. This paper presents the manoeuvrability of the ship with different scale ratios: 1/65.8, 1/42.0, and 1/31.6 in model scale. KRISO conducted Free Running Model Tests (FRMT): 35° turning circle tests and 20/20(10/10) zigzag manoeuvring tests. The test results indicated that advance and tactical diameter in turning circle tests were similar, and overshoot angles in two zigzag manoeuvring tests increased as the model ship size increased. In addition, a basic concept for the FRMT method with an auxiliary X-thrust device was proposed so that the scale effect could be considered in model ship tests.