• Title/Summary/Keyword: 동적 실험

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Development of Dynamic p-y Curve for Jacked Pile by Centrifuge Test (원심모형 실험을 이용한 압입말뚝에 대한 동적 p-y 곡선 산정)

  • Yoo, Min-Taek;Kwon, Sun-Yong;Lee, Il-Hwa
    • Journal of the Korean Geotechnical Society
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    • v.32 no.3
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    • pp.39-47
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    • 2016
  • In this study, dynamic centrifuge tests in dry sand were conducted in order to evaluate the effect of pile installation on the dynamic p-y curve. According to the result of the pile installation effect on the dynamic p-y backbone curves, the subgrade resistance of a jacked pile in 40 g was found to be greater than that of a jacked pile in 1 g and a preinstalled pile in 1 g. It was also found that differences of the subgrade resistance decrease with the depth of the pile. Applicability of dynamic p-y backbone curve for the bored pile proposed by preceded researcher was evaluated by comparing with the result of centrifuge tests. In addition, dynamic p-y backbone curve for jacking/driven pile was developed by modifying that for the bored pile.

동적 파괴역학에 대하여 (IV)

  • 이억섭;김상철
    • Journal of the KSME
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    • v.25 no.5
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    • pp.419-424
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    • 1985
  • 동적탄소성 균열전파 문제는 매우 복잡한 문제이며 따라서 아직까지 이론적으로 명쾌한 해가 발표되지 못하고 있는 형편이다. 따라서 실험적인 연구는 아주 미비하며 다만 몇편의 논문만 발표되고 있는 편이다. 여기서는 Lee(47)의 실험적인 연구내용 및 연구결과를 간단히 강의하기로 한다.

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Animated Quantile Plots for Evaluating Response Surface Designs (반응표면실험계획을 평가하기 위한 동적분위수그림)

  • Jang, Dae-Heung
    • Proceedings of the Korean Society for Quality Management Conference
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    • 2010.04a
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    • pp.115-120
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    • 2010
  • 반응표면실험계획들을 평가하기 위한 방법으로서 전형적인 방법이 알파벳최적화이다. 그러나 이러한 알파벳최적화(D-, A-, G-, V-최적화 등)는 하나의 수치이므로 그 유용성에도 불구하고 반응표면실험 계획들이 갖는 추정반응값분산의 분포에 대한 정보에 한계를 갖는다. 이를 극복하고자 하는 대안으로서 그래픽 방법들이 있는데 우리는 그 중에 분위수그림을 애니메이션화한 동적분위수그림을 제안할 수 있고 이 동적분위수그림을 이용하여 반응표면실험계획들이 갖는 추정반응값분산의 분포를 서로 비교, 평가 할 수 있다.

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Static and Dynamic Tests on Laminated Rubber Bearings (적층(積層)고무받침의 정적(靜的) 및 동적(動的) 특성실험(特性實驗))

  • Kim, Nam Sik;Lee, Dong Guen
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.13 no.2
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    • pp.85-93
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    • 1993
  • Base isolation systems are economic and efficient for the control of structural vibration. In this study, the base isolators of LRB(laminated rubber bearing) type which have been generally used are fabricated and tested. From the static and dynamic tests, the characteristics of the base isolators, considering strain-hardening, hysteretic damping and horizontal stiffnesses, etc., are verified and particularly the feasibility as base isolation devices is discussed. Consequently, the test results are compared with the analytical ones that are derived from idealization as a bilinear model.

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Pseudo-Dynamic Tests on Base-Isolated Liquid Storage Tanks (기초분리(基礎分離)된 액체저장(液體貯藏)탱크의 유사(類似) 동적실험(動的實驗))

  • Kim, Nam Sik;Lee, Dong Guen
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.13 no.4
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    • pp.51-64
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    • 1993
  • Base-isolated liquid storage tanks under seismic loading were tested by the Pseudo-dynamic test method. Substructuring technique in which a mixed integration method was adopted and the liquid tanks were simply modeled as a discrete system. This study gave experimental verification on the advantage of mounting the liquid tanks on base isolators in order to reduce the hydrodynamic forces on the tank wall.

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Unscented Particle Filter for Time Domain Identification of Nonlinear Structural Dynamic Systems (Unscented Particle filter를 이용한 시간영역 비선형 구조계 규명기법)

  • 구기영;윤정방
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2002.09a
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    • pp.213-220
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    • 2002
  • 본 연구에서는 최근에 개발된 Unscented Particle Filter (UPF)를 사용한 비선형 동적 구조계의 구조계수 규명기법이 연구되었다. 일반적인 비선형 구조계수 추정 문제의 일반 해는 존재하지 않으나, 그에 대한 대안으로써 선형 근사 기법인 extended Kalman filter (EKF)가 비선형 동적 구조계수의 추정에 주로 사용되어왔다. 그러나, EKF는 구간 선형(piecewise linear) 가정으로 인해 biased estimator이고 비선형성이 상대적으로 높을 때 오차가 큰 추정치를 주는 단점을 가진다. 이를 보완하기 위해서 UPF가 개발되었고, 이 기법은 particle filter의 일종으로써 Unscented Kalman filter (UKF)를 사용하여 importance proposal distribution을 생성한다. 수치실험이 SDOF와 MDOF에 대하여 3가지 경우에 대해서 수행되었다. 비선형 SDOF의 수치 실험으로부터 잡음이 가해진 상태에서 UKF가 EKF에 비해 초기 공분산 행렬의 가정에 대해 정확하고 강인한 추정결과를 보여줌을 보였다 최하층의 column에 비선형 거동이 발생하는 5층 전단 빌딩모형의 수치실험으로부터 UKF가 복잡한 구조물의 구조계수 추정능력이 있음을 보여주었다. 여러 가지 수치실험은 UPF가 EKF보다 비선형 동적 구조계수 추정에 있어서 더 나은 방법임을 보여 주었다.

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Scaling and Dynamic Effects on the Plate Cutting Response (판의 찢김 응답에 대한 치수 및 동적 효과)

  • 백점기;이탁기
    • Journal of the Society of Naval Architects of Korea
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    • v.33 no.3
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    • pp.48-55
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    • 1996
  • The aim of the present study is to investigate the scaling and dynamic erects on the plate cutting response. A series of cutting tests for unstiffened and longitudinally stiffened steel plate specimens in a quasi-static condition were carried out, varying the plate thickness. Based on the previous as well as the present test results, the scaling effect of Plate thickness on the cutting response is investigated. Dynamic erects are also clarified from the devious theoretical and experimental results. The Cowper-Symonds constitutive equation originally derived for mild steel is modified to consider the influence of strain-rate sensitivity on yield strength of high tensile steel.

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Surface Saturation Area-Subsurface Outflow-Soil Moisture Storage Relationships: II. Dynamic Analysis (지표포화지역-중간류유출-흙수분저류량 관계: II. 동적 분석)

  • 이도훈;이은태
    • Water for future
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    • v.29 no.2
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    • pp.143-151
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    • 1996
  • The dynamic responses in the subsurface outflow, surface saturation area, soil moisture storage are established by numerical experiments with Richards equation. In addition to this, the dynamical relationship between surface saturation area and subsurface outflow, and between surface saturation area and soil moisture storage are also determined by varying the hillslope shape, soil type, and boundary condition. The simulation results indicate that the dynamical relationships between surface saturation area and subsurface outflow, and between surface saturation area and soil moisture storage are approximated by the steadystate relationships. And the dynamic responses of subsurface outflow and surface saturation area are characterized by the double peaks although the rainfall pattern is asimple pulse input. As a result of numerical simulation, the physical mechanism for the occurrence of the double peaks is explained using the concept of variable source area.

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Implementation of Path-finding Algorithm with Maximum Speed Dynamic Heuristic (최고속력 동적휴리스틱을 활용한 경로탐색 알고리즘의 구현)

  • Moon, Dae-Jin;Cho, Dae-Soo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2008.08a
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    • pp.87-90
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    • 2008
  • Dynamic Heuristic(DH) is not fixed data and is dynamically modified using transferred real time road data from server In this paper, we propose path-finding algorithm with Maximum Speed Dynamic Heuristic (DH-MAX) and do an experiment. The DH-MAX is to be used the highest speed as DH, in real map divided by same sire. And proposed algorithm searches path using the priority searching only of the fixed data, but also the highest speed with real time information. In the performance test, the quality of path is enhanced but the cost of searching is increased than $A^*$ algorithm.

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Effect of 8 Direction Incline and Rotation Exercise on Pain and Dynamic Balance in the Patients with Chronic Low Back Pain (8방향 경사와 회전 운동이 만성요통환자의 통증과 동적균형에 미치는 영향)

  • Goo, Bong-Oh;Park, Min-Chull;Song, Yoo-Yik;Cho, Ye-Rim
    • The Journal of the Korea Contents Association
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    • v.10 no.9
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    • pp.285-292
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    • 2010
  • The purpose of this study is to investigate the effect of 8 direction incline and rotation exercise on pain and dynamic balance in the patients with chronic low back pain(CLBP). 20 patients who were diagnosed with CLBP were included for the study. 10 patients(experimental group) were treated by modality{Hot Pack(H/P), Transcutaneous Electric Nerve Stimulation(TENS), Ultra Sound(U/S)} and then performed 8 direction incline and rotation exercise. The other 10 patients(control group) were only treated by modality. The therapeutic intervention was taken three times a week for 6 weeks. Dynamic balance was assessed by Star Excursion Balance Test(SEBT) and pain was assessed by Visual Analog Scale(VAS). VAS scores of both groups were decreased. However, the experimental group was more significantly decreased than the control group. The dynamic balance of both groups was significantly increased in anterior, posterior, medial, lateral direction. But experimental group was more significantly increased than the control group. In conclusion, 8 direction incline and rotation exercise was effective on pain and dynamic balance in CLPB.