• Title/Summary/Keyword: model test

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INVESTIGATION OF THE PILE MOVEMENT DUE TO TUNNELLING BY MODEL TEST AND NUMERICAL ANALYSIS

  • Lee, Yong-Joo
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.09c
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    • pp.104-110
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    • 2010
  • In this study, a series of two-dimensional model test and numerical analysis was carried out to investigate the pile movement due to tunnelling in soft ground. The model test consists of 21 cases according to locations of the pile tip over the centre position of model tunnel. To identify both the pile and ground movements a close-range photogrammetric technique was adopted in the model test. The results from the model test were compared to the two-dimensional finite element analysis using the CRISP program. It was found that the rotation point on the pile was significantly affected by factors such as the offset distance from the model tunnel and the volume loss that occurred during the tunnelling operation.

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A Study on the Resistance Test Method for Planning Hull Model using the High Speed Towing Carriage (무인고속전차를 이용한 활주선 모형의 저항시험 기법 연구)

  • Lee, Young-Gill;Ha, Yoon-Jin;Jeong, Kwang-Leol;Chae, Soon-Jae
    • Journal of the Society of Naval Architects of Korea
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    • v.51 no.5
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    • pp.349-355
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    • 2014
  • The resistance test of a high speed craft such as planing ship is performed with a high speed towing carriage instead of ordinary towing carriage because of the speed limitation. In the resistance test using high speed towing carriage, the model ship is fixed to the carriage to restrain the running attitude for enough measuring time. Such method is called fixed model test method. In the fixed model test method, to get the appropriate running attitude, the model test is iteratively repeated until the trim moment and lift force are close to zero. In this research, trim free model test method is investigated to reduce the number of iteration. And, the limitation of towing speed range in the trim free model test method is investigated.

A Basic study on the sea model test techniques for high speed Planing Boat (실 해상모형시험을 이용한 고속 활주정의 선형시험기법 기초연구)

  • Jang, Dong-Won;Park, Chung-Hwan;Jin, Song-Han
    • Journal of Navigation and Port Research
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    • v.34 no.8
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    • pp.623-628
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    • 2010
  • High speed marine vehicle, such as semi-planing, planing craft have been developed recently. These ships paid attention to the resistance characteristics, especially in high speed region. Model test method is divided to two equipment greatly, first 'Towing tank', second 'C.W.C.'. It is difficult to estimate a resistance characteristics for high speed boat. because these are made for low speed ship. This paper suggests a new model test method and system. This is real sea model test and it's comprised of eight part. Firstly, This method is tested at C.W.C that is possible to using in real sea model tes using low speed boat modelt. And then, Real sea model test and CFD calculation are performed and compared with tow way used high speed boat model. It can be a good way to estimate a performance for high speed boat.

Performance Evaluation of Fin-Stabilizer by Model Test and Time-domain Simulation (시뮬레이션과 모형시험을 통한 핀 안정기의 성능평가)

  • 홍사영;김현조;최윤락;신영균;유병석;이승준
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2001.10a
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    • pp.86-90
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    • 2001
  • Demand of good seakeeping perfomace is increasing for sea going vessels such as cruisers, naval ships and container ships. Especillay roll motion is one of major concerns in evaluation of seakeeping performance due to its large resonace motion. Since large roll resonance motion is mainly arised from inherent small damping. use of additional mechnism to provide roll damping can significantly reduce roll motion. In this paper, a reliable performace evaluation method of fin stabilizer, which is very useful for stabilizing roll motion of mid and high speed vessls, is described. Model test and time domain simulation methods are adopted for performance evaluation in which real operating situation of fin stabilizer can be exactly modelled. Model test and simulation results show good correlations between model test and simulation results.

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The Sensitivity Analysis on Failure Parameter of Adjacent Twin Tunnel Using Model Tests (근접 병설터널 모형실험을 통한 붕괴인자 민감도 분석)

  • Han, Yeon-Jin;Shim, Seung-Bo;Choi, Yong-Kyu;Kim, Gun-Ho;Chang, Ock-Sung;Kim, Hong-Taek
    • Proceedings of the Korean Geotechical Society Conference
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    • 2009.03a
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    • pp.585-594
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    • 2009
  • In this present study, to performed the model test and estimated the behavior characteristics of twin tunnel in accordance with the variation of the whole failure parameters which is the strength of the ground, distance of tunnel, angle of the joint, installation of tension bolts and the blasting load. To carry out the numerical analysis for verification of model test results and analyze the sensitivity on failure parameters using model test and numerical analysis results. Based on sensitivity analysis results, to propose the most habitually failure parameters in tunnel scale model test.

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Similarity rule of Seepage failure by Centrifuge model test (원심모형시험기를 이용한 사면의 침투 및 파괴에 관한 상사법칙의 검토)

  • Kim, Jae-Young;Jun, Tohda
    • Proceedings of the Korean Geotechical Society Conference
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    • 2004.03b
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    • pp.313-318
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    • 2004
  • When plan breakdown by permeation of fill dam, bank by original decision scale model test of sound, original decision scale model test of sound that destroy having used water was carried out. And original decision scale model test of sound that use viscous fluid is carried out, but doubt remains in experiment result in state that verification of law of similarity is not achieved. In this study, verified according to Modeling of Models' method effecting law of similarity to use n ship horoscope solution of water.

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Comparision Analysis of Model Test for Prediction of Uplift Resistance in the Reclaimed Land Greenhouse Foundation (간척지 온실기초 나무말뚝의 인발저항력 예측을 위한 실내모형시험 결과 비교·분석)

  • Song, Chang Seob;Kim, Myeong Hwan;Jang, Ung Hee
    • Journal of The Korean Society of Agricultural Engineers
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    • v.58 no.2
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    • pp.45-52
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    • 2016
  • The object of this paper was to evaulate modified proposed design equation in model test result in order to estimate uplift-resistance of timber pile of reclaimed land greenhouse foundation. Uplift resistance result of model test was increased to according to increased of contact area. Uplift-resistance result of field test tend to lineary increased to according to increased of embedment depth and contact area. Results of field uplift-resistance was evaluate compare with modified proposed design equation results of model test and Effective stress method. As the Effective stress method tend to underestimate, modified proposed design equation results of model test tend to similar type. As the contact area increase, difference between field uplift-resistance results and modified proposed design equation results of model test was considered uplift-speed.

The Movable Hydraulic Model Test for Exchange of Intake Weir in the Nakdong River (낙동강 취수보개체를 위한 이동상 수리모형실험)

  • 김성원
    • Journal of Environmental Science International
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    • v.9 no.1
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    • pp.35-42
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    • 2000
  • In this study, the movable bed model testing was carried out so as to analyze bed profile changes including predicting scouring and deposition of bed profile and to solve hydraulic problems affecting with bed and both-bank between upstream and downstream of intake weir in the Nakdong river channel. The movable bed model testing consists of fundamental test, movable model test and numerical analysis method respectively. The fundamental test was enforced to analyze relationship of discharge and sediment load in the tilting flume. When the movable model test was worked, it was shown that sediment budget between input sediment load and output sediment load was balanced exactly. As a result of movable model test, it was presented that scouring and deposition changes in quantities between the upstream and downstream of modification weir were less than those of nature and planning weir. Finally, numerical analysis method was operated by 1-dimensional bed profile changes model ; HEC-6 model so as to complement unsolving hard problems during movable model test. So, modification weir will sustained the stable bed profile changes than any other weirs in the study channel.

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A Research on Dynamic Tension Response of Model Mooring Chain by Forced Oscillation Test (강제동요 시험을 이용한 모형 계류삭의 동적 응답 연구)

  • Kim, Hyun-Joe;Hong, Sa-Young;Hong, Sup;Cho, Suk-Kyu
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2002.10a
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    • pp.134-141
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    • 2002
  • A series of forced oscillation test on model mooring chain was carried out to investigate dynamic tension characteristics. The model test was conducted at two different water depth to gather basic data for 'truncated mooring test' and 'hybrid mooring test'. The truncated and hybrid mooring test are highly recommended to overcome the limitation of water depth in model test recently. The resultant tension RAO gives good possibility of approximation of dynamic tension by equivalent weight adjustment for the ratio of water depth in different water depth. Because the hybrid mooring test is the adequate combination of model test and simulation, accurate simulation model on mooring system is essential. The simulation results show good agreement with model test results.

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Maneuvering Hydrodynamic Forces Acting on Manta-type UUV Using CFD

  • Lee, Seong-Eun;Lee, Sung-Wook;Bae, Jun-Young
    • Journal of Ocean Engineering and Technology
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    • v.34 no.4
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    • pp.237-244
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    • 2020
  • In this study, we investigate surge force, heave force, and pitch moment, which are vertical plane hydrodynamics acting on Manta-type unmanned underwater vehicles (UUVs), using a model test and computational fluid dynamics (CFD) simulation. Assessing the maneuvering hydrodynamic characteristic of an underwater glider in the initial design stage is crucial. Although a model test is the best approach for obtaining the maneuvering hydrodynamic derivatives for underwater vehicles, numerical methods, such as Reynolds averaged Navier-Stokes (RANS) equations, have been used owing to their efficiency in terms of time and cost. Therefore, we conducted an RANS-based CFD calculation and a model test for Manta-type UUVs. In addition, we conducted a validation study through a comparison with a model test conducted at a circular water channel (CWC) in Korea Maritime & Ocean University Furthermore, two RANS solvers (Star-CCM+ and OpenFOAM) were used and compared. Finally, the maneuvering hydrodynamic forces obtained from the static drift and resistance tests for a Manta-type UUV were presented.