• 제목/요약/키워드: Test ship

검색결과 1,264건 처리시간 0.027초

Experimental and numerical study on ice resistance for icebreaking vessels

  • Hu, Jian;Zhou, Li
    • International Journal of Naval Architecture and Ocean Engineering
    • /
    • 제7권3호
    • /
    • pp.626-639
    • /
    • 2015
  • Ice resistance is defined as the time average of all longitudinal forces due to ice acting on the ship. Estimation of ship's resistance in ice-covered waters is very important to both designers and shipbuilders since it is closely related to propulsion of a ship and it determines the engine power of the ship. Good ice performance requires ice resistance should be as low as possible to allow different manoeuvres. In this paper, different numerical methods are presented to calculate ice resistance, including semi-analytical method and empirical methods. A model test of an icebreaking vessel that was done in an ice basin has been introduced for going straight ahead in level ice at low speed. Then the comparison between model test results and numerical results are made. Some discussions and suggestions are presented as well to provide an insight into icebreaking vessel design at early stage.

실선시운전 선속 보정을 위한 실시간 해수유동 예측 활용 (Application of Real Time Currents Prediction in Ship Speed Correction of Sea Trial Test)

  • 이문진;이한진;신명수;정수원
    • 한국항해항만학회지
    • /
    • 제38권6호
    • /
    • pp.593-600
    • /
    • 2014
  • 실시간 해수유동 정보를 중심으로 신조선 선박의 실선시운전에서 활용될 수 있는 정보 제공 시스템을 개발하였다. 본 시스템에서는 실선시운전 지원 정보로서 특정시간 해수유동의 공간분포를 예측하여 제공하며, 특정지점 해수유동의 시계열 변동을 예측하여 제공한다. 또한 본 시스템은 실선시운전에 있어 시험선박 운항경로에서의 해수유동 정보 및 선속 손실정보를 제공하기 위하여 GPS와 연결할 수 있는 기능을 가지고 있으며, 이러한 기능을 이용하여 실선시운전시 자동으로 운항경로상의 해수유동 실시간 정보 및 해수유동에 의한 선속손실을 계산하여 제공한다. 실선시운전 중의 정보 제공 이외에, 본 시스템에서는 특정한 시험시간과 시험경로에 대해 선속손실을 예측하여 제공함으로써 최적의 시험시간 및 시험경로를 계획할 수 있도록 지원하는 기능도 가지고 있다. 본 연구에서 개발된 실선시운전을 위한 실시간 해수유동 예측시스템은 효율적인 시험계획과 정확한 해역특성 파악을 지원할 뿐 아니라, 실선에 탑재되어 시험 중에 요구되는 다양한 정보를 제공한다.

실선시험에 의한 새바다호의 조종 성능에 관한 고찰 (A study on the manoeuvrability of T/S SAEBADA by real sea trials)

  • 안영수;강일권;김형석;김정창;김민석;조효제;이춘기
    • 수산해양기술연구
    • /
    • 제41권4호
    • /
    • pp.289-295
    • /
    • 2005
  • This study is intended to provide navigator with specific information necessary to assist in the avoidance of collision and in operation of ships to evaluate the manoeuvrability of own ship. The actual manoeuvering characteristics of ship can be adequately judged from the results of typical ship trials manoeuvres. Author carried out sea trials based full scale for turning test, zig-zag test, spiral tests and crash-stop test at actual sea going condition. The turning circle manoeuvres were performed on starboard and port sides with $35^{\circ}$ rudder angle at the service speed, and Zig-zag procedures were performed on both sides with $10^{\circ}$ and $20^{\circ}$ rudder angle respectively. Spiral tests were carried out on the both sides and crash stop test was also carried out. The results from tests could be compared directly with the standards of manoeuverability of IMO and consequently the manoeuvring qualities of the ship is fully satisfied with its.

A Study on Current Characteristics Based on Design and Performance Test of Current Generator of KRISO's Deep Ocean Engineering Basin

  • Kim, Jin Ha;Jung, Jae Sang;Hong, Seok Won;Lee, Chun Ju;Lee, Yong Guk;Park, Il Ryong;Song, In Haeng
    • 한국해양공학회지
    • /
    • 제35권6호
    • /
    • pp.446-456
    • /
    • 2021
  • To build an environment facility of a large-scale ocean basin, various detailed reviews are required, but it is difficult to find data that introduces the related research or construction processes on the environment facility. The current generator facility for offshore structure safety evaluation tests should be implemented by rotating the water of the basin. However, when the water in the large basin rotates, relatively large flow irregularities may occur and the uniformity may not be adequate. In this paper, design and review were conducted to satisfy the performance goals of the DOEB through computational numerical analysis on the shape of the waterway and the flow straightening devices to form the current in the large tank. Based on this, the head loss, which decreases the flow rate when the large tank water rotates through the water channel, was estimated and used as the pump capacity (impeller) design data. The impeller of the DOEB current generator was designed through computational numerical analysis (CFD) based on the lift surface theory from the axial-type impeller shape for satisfying the head loss of the waterway and maximum current velocity. In order to confirm the performance of the designed impeller system, the flow rate and flow velocity performance were checked through factory test operation. And, after installing DOEB, the current flow rate and velocity performance were reviewed compare with the original design target values. Finally, by measuring the current velocity of the test area in DOEB formed through the current generator, the spatial current distribution characteristics in the test area were analyzed. Through the analysis of the current distribution characteristics of the DOEB test area, it was confirmed that the realization of the maximum current velocity and the average flow velocity distribution, the main performance goals in the waterway design process, were satisfied.

LCT에서 선박용 상호반전 프로펠러 상호작용 특성의 시험적 연구 (Experimental Study of the Interaction Characteristics for a Marine CRP in LCT)

  • 안종우;김기섭;박영하;이창훈
    • 대한조선학회논문집
    • /
    • 제54권2호
    • /
    • pp.125-131
    • /
    • 2017
  • In order to develop test and performance analysis techniques for a CRP propulsion, a CRP dynamometer which can be installed inside the model ship was designed and manufactured. The object ship was the 16000TEU container carrier, which has test results for the single propeller. The design concept of the present CRP is that forward & after propellers have the same power ratio and their RPM ratio is 0.75:1. To begin with, we checked the performance of the CRP dynamometer through the calibration and then installed it inside the model ship. After the model ship setup including the design CRP and the rudder in the Large Cavitation Tunnel(LCT), a series of model tests composed of power ratio check, propeller behind wake(PBW) test, cavitation observation and pressure fluctuation tests was conducted. Through the model test and data analysis for CRP, the experimental technique was established and the improved method for CRP design was suggested.

흘수변화가 선박 조종 성능에 미치는 영향에 관한 연구 (The Study on the Effect of Loading Condition on Ship Manoeuvrability)

  • 임남균;권석암;김세은
    • 대한조선학회논문집
    • /
    • 제42권2호
    • /
    • pp.105-112
    • /
    • 2005
  • IMO standards for ship manoeuvrability were applied from January 1, 2004. Though model test or sea trial in full load condition is needed, it is not always possible to get such data for every ships. Therefore it is required to study the effect of loading conditions on ship manoeuvrability. Approximate formulae to estimate the hydrodynamic forces acting on a ship and the 2nd overshoot angle of $10^{\circ}$/$10^{\circ}$ zig-zag test in certain loading condition are proposed in this study These were derived from the results of model test and sea trial data. Captive model tests for 7 ships with 15 different loading conditions and sea trial data including free running test of 6 cases were used. Compared with experiment data and prediction formulae already proposed by others, the approximate formulae in this study show good agreement with model test results.

함정의 수중폭발 충격시험을 위한 계측장비 시스템 개발 (Development of Measurement System for the Underwater Explosion Shock Test of Naval Ships)

  • 박일권;조대승;김종철
    • 대한조선학회논문집
    • /
    • 제40권4호
    • /
    • pp.66-74
    • /
    • 2003
  • In non-contact underwater explosion shock test of a real naval ship, measurement of shock loadings and responses should require onboard system to be able to safely trigger an explosive and to simultaneously and successfully measure scores of shock signals in the deteriorated environment. For this purpose, we have developed a shock-hardened measurement system resistible to 170g peak acceleration having 4 msec duration by resiliently mounting general purpose measurement instruments in racks. The system can simultaneously measure and record 200 signals to evaluate shock leadings and responses of the test ship by triggering an explosive and measurement instruments at the same time. We prove the performance of the developed system by introducing the signal acquisition results from of a real ship underwater shock test, firstly performed in Korea.

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

  • 이태일;권순홍
    • 한국해양공학회지
    • /
    • 제16권6호
    • /
    • pp.25-31
    • /
    • 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.

선박 국부구조 3 축 방향 가진 실험장치 개발 (The development of the 3 axes exciter for the local structure)

  • 이찬희;김희원
    • 한국소음진동공학회:학술대회논문집
    • /
    • 한국소음진동공학회 2012년도 춘계학술대회 논문집
    • /
    • pp.686-690
    • /
    • 2012
  • The modal test has been carried out using the exciter machine to investigate the vibration characteristics of the hull and super structure of the ship. The conventional exciter acts only one(1) direction and the exciter should be reinstalled for different direction test, which consumes additional expense. The 3 axes exciter has been designed of which force acts three directions without reinstallation for efficient modal test of the ship. It consists of rotatable base frame structure and the clutch mechanism for the unbalances to excite three directions. And the 3 axes exciter for the local structure has been made in advance and its performance test was carried out in the laboratory. The developed 3 axes exciter shows the ability of three-directions excitation with simple operation and modal test for the various local structure of the ship will be performed.

  • PDF

비정렬 격자를 이용한 선체 주위의 유동 해석 (ANALYSIS OF FLOW AROUND SHIP USING UNSTRUCTURED GRID)

  • 전제형;이상의;권재웅;손재우
    • 한국전산유체공학회:학술대회논문집
    • /
    • 한국전산유체공학회 2011년 춘계학술대회논문집
    • /
    • pp.187-193
    • /
    • 2011
  • In this report, We compared the actual test with the result of pow calculation and Resistance/Self-propulsion of the ship using STAR-CCM+ which is the commercial Reynolds Averaged Navier-Strokes(RANs) Solver. The calculation model was the KRISO Container Ship and 205K Bulk Carrier of Sungdong shipbuilding company. For this calculation, We used Realizable K-Epsilon model for flaw analysis, VOF method for the free surface creation, Moving Reference Frame method for reducing the POW calculation time, and Sliding Mesh method for Self-Propulsion analysis. Calculation of Resistance and Self-Propulsion includes the free-surface. And all calculations in this report were based on unstructured grids.

  • PDF