• Title, Summary, Keyword: Full scale model test

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Analysis on the Propulsive Performance of Full Scale Ship (실선의 추진성능 해석기법에 관한 연구)

  • Yang, Seung-Il;Kim, Eun-Chan
    • 한국기계연구소 소보
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    • pp.183-191
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    • 1982
  • This report describes the analysis method of the full-scale propulsive performance by using the data of model test and the full-scale speed trial. The model test data were analyzed by the computer program "PPTT" based on "1978 ITTC Performance Prediction Method for Single Screw Ships." Also the full-scale speed trial data were analyzed by the computer program "SSTT" based on the newly proposed “SRS-KIMM Standard Method of Speed Trial Analysis." An analysis of model and full-scale test data was carried out for a 60.000 DWT Bulk Carrier and the correlation between model and full-scale ship was stuied.

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Comparative Study of Full-Scale Propeller Cavitation Test and LCT Model Test for MR Tanker (MR Tanker 실선 프로펠러 캐비테이션 시험 및 LCT 모형시험과 비교연구)

  • Ahn, Jong-Woo;Paik, Bu-Geun;Seol, Han-Shin;Park, Young-Ha;Kim, Gun-Do;Kim, Ki-Sup;Jung, Bo-Jun;Choi, Sung-Jun
    • Journal of the Society of Naval Architects of Korea
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    • v.53 no.3
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    • pp.171-179
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    • 2016
  • In order to study correlation of the propeller cavitation performance between a full-scale ship and a model ship for the MR Tanker, the full-scale ship and the model tests were conducted. The full-scale ship test is composed of cavitation observation, pressure fluctuation and noise measurements, which are conducted using 2 observation windows and 8 pressure transducers installed inside the full-scale ship above the propeller. The model test in the Large Cavitation Tunnel(LCT) was conducted at the same conditions as that of the full-scale ship and its results are compared with those of the full-scale ship. Through the model-ship correlation analysis, it is considered that the experimental technique for the MR Tanker class ship was verified in LCT.

Flexural Performance of Full-scale RC Beams Strengthened with Different Amount of FRP Composite (FRP복합체로 보강된 실물모형 RC보의 보강재 강성에 따른 휨 보강성능)

  • Choi, Ki-Sun;You, Young-Chan;Kim, Keung-Hwan
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.125-128
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    • 2006
  • Many research have been carried out concerned with the flexural performance of FRP composite in a various ways. Most of them, however, have used a small-scale specimen, so haven't been fully verified by full-scale model test. In this study, a full-scale RC beam model test for flexural strengthening with CFRP composites has been performed in order to verify test results obtained through a series of small-scale model test with respect to FRP stiffness affecting strengthening performance in the previous studies. A total of 4 specimens have been manufactured including control beam. The specimens strengthened with CFRP composites consist of 3 different CFRP stiffness with 2 types of CFRP composite. Consequently, the purpose of this study is to estimate influence of the size effect of specimens and FRP stiffness on the flexural performance. As a result, the effective strain of FRP composite is inversely proportional to FRP stiffness and ensures the same performance with small-scale model test.

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Comparison of Cavitation Patterns between Model Scale Observations using Model and Full-Scale Wakes and Full Scale Observations for a Propeller of Crude Oil Carrier (원유운반선 프로펠러의 모형 및 실선 축척 반류에서의 공동현상과 실선에서 관측된 공동현상의 비교)

  • Choi, Gil-Hwan;Chang, Bong-Jun;Hur, Jae-Wook;Cho, Dae-Seung
    • Journal of the Society of Naval Architects of Korea
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    • v.48 no.1
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    • pp.15-22
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    • 2011
  • In this paper, cavitation patterns of model tests were compared with those of full-scale measurement for a propeller of crude oil carrier which was suffered from erosions on suction side of blade tip region. Cavitation tests were performed at design and ballast draft using model and full scale nominal wakes. A model ship and wire mesh method was used for the simulation of wake patterns of model nominal wakes. For the prediction of full-scale wake patterns, a RANS solver(Fluent 6.3) was used and wire mesh method was used for the simulation of the full scale wakes. Comparison results show that cavitation patterns using predicted full-scale wake patterns are closer to cavitation patterns of full-scale measurement at ballast draft condition. Also, cloud cavitations were observed on the position of eroded area at both full-scale measurement and cavitation tests using simulated full-scale wake patterns.

Seismic Test of a Full Scale Model of Wood House with Tiled Roof (기와집 실물크기 모델의 지진 실험)

  • Ryu, Hyeuk;Kim, Jae-Kwan;Jeon, Bong-Hee;Kim, Byung-Hyun
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.368-373
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    • 2003
  • To improve the reliability of seismic hazard assessment of historic earthquake, shaking table test of a full scale model of wood house with tiled roof was performed. Full scale model was constructed through rigorous verification process to have quantitative relationship between the intensity of earthquake and damage state. The completed model was mounted on a shaking table and subjected to the dynamic tests. Two kinds of tests were performed: exploratory test and fragility test. The exploratory test was done with low intensity shaking. In the fragility test, the behavior of the model was carefully monitored while increasing the shaking intensity. The construction details of the model are provided and test procedures are reported. Finally important test results are presented and their implications are discussed.

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Numerical prediction analysis of propeller bearing force for full-scale hull-propeller-rudder system

  • Wang, Chao;Sun, Shuai;Li, Liang;Ye, Liyu
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.8 no.6
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    • pp.589-601
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    • 2016
  • The hybrid grid was adopted and numerical prediction analysis of propeller unsteady bearing force considering free surface was performed for mode and full-scale KCS hull-propeller-rudder system by employing RANS method and VOF model. In order to obtain the propeller velocity under self-propulsion point, firstly, the numerical simulation for self-propulsion test of full-scale ship is carried out. The results show that the scale effect of velocity at self-propulsion point and wake fraction is obvious. Then, the transient two-phase flow calculations are performed for model and full-scale KCS hull-propeller-rudder systems. According to the monitoring data, it is found that the propeller unsteady bearing force is fluctuating periodically over time and full-scale propeller's time-average value is smaller than model-scale's. The frequency spectrum curves are also provided after fast Fourier transform. By analyzing the frequency spectrum data, it is easy to summarize that each component of the propeller bearing force have the same fluctuation frequency and the peak in BFP is maximum. What's more, each component of full-scale bearing force's fluctuation value is bigger than model-scale's except the bending moment coefficient about the Y-axis.

The influence of model surface roughness on wind loads of the RC chimney by comparing the full-scale measurements and wind tunnel simulations

  • Chen, Chern-Hwa;Chang, Cheng-Hsin;Lin, Yuh-Yi
    • Wind and Structures
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    • v.16 no.2
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    • pp.137-156
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    • 2013
  • A wind tunnel test of a scaled-down model and field measurement were effective methods for elucidating the aerodynamic behavior of a chimney under a wind load. Therefore, the relationship between the results of the wind tunnel test and the field measurement had to be determined. Accordingly, the set-up and testing method in the wind tunnel had to be modified from the field measurement to simulate the real behavior of a chimney under the wind flow with a larger Reynolds number. It enabled the results of the wind tunnel tests to be correlated with the field measurement. The model surface roughness and different turbulence intensity flows were added to the test. The simulated results of the wind tunnel test agreed with the full-scale measurements in the mean surface pressure distribution behavior.

An estimation method of full scale performance for pulling type podded propellers

  • Park, Hyoung-Gil;Choi, Jung-Kyu;Kim, Hyoung-Tae
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.6 no.4
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    • pp.965-980
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    • 2014
  • This paper presents a new estimation method of full scale propulsive performance for the pulling type podded propeller. In order to estimate the drag of pod housing, a drag velocity ratio, which includes the effects of podded propeller loading and Reynolds number, is presented and evaluated through the comparison of model test and numerical analysis. By separating the thrust of propeller blade and the drag of pod housing, extrapolation method of pod housing drag to full scale is deduced, and correction method of propeller blade thrust and torque to full scale is presented. This study utilized the drag coefficient ratio of the pod housing as a measure for expanding it to full scale, but in order to increase the accuracy of performance evaluation, additional study is necessary on the method for the full scale expansion via separating the drag of pod body, strut and fin which consist the pod housing.

Seismic Performance Evaluation of Circular RC Bridge Piers with Shear-Flexure Behavior (휨-전단 복합 거동 원형 RC교각의 내진성능 평가)

  • 김병석;곽임종;조창백;조정래
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.337-344
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    • 2001
  • Some as-built drawings in national roadway bridges in Korea were examined. There are many bridge piers, whose aspect ratios are in the vicinity of 2.5. These columns are expected to do shear-flexure behaviour and have large scale effect between full and reduced scale model. In the study, full and 1/2 scale model tests on the shear-flexure behaviour columns were carried out. The seismic performance of existing bridge piers without seismic details were examined by Quasi Static Test

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Deformation Measurement of Roadbed in Full-scale Field Test to Determine an Optimum Trackbed of High-Speed Railway (고속철도 노반의 최적단면 결정을 위한 실대형 모형시험에서의 노반 변형 계측)

  • Jung, Young-Hoon;Kim, Hak-Sung;Byeon, Bo-Hyeon;Lee, Jin-Wook
    • Proceedings of the KSR Conference
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    • pp.2821-2829
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    • 2011
  • Since the KTX was in operation in 2004, a number of researches on increasing the train speed have been conducted. Currently, the Honam High-speed train system is designed for the operation velocity of 350km/h. The societal demand expects higher operation speed, whereas the existing construction method and design specification are questioned in the KTX operation in the velocity over 350 km/h. In this study, a full-scale model test was conducted to obtain the preliminary data that is necessary to understand deformation characteristics of the reinforced road bed and the subgrade layers. In the full-scale model test, direct arrival seismic tests, crosshole seimic test, in-situ bender element test and sensing bar test were employed to measure the stiffness and deformation of the trackbed. The systematic analysis on the different set of measurements enhances the understanding of the behavior of the trackbed.

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