• 제목, 요약, 키워드: Displacement

검색결과 11,342건 처리시간 0.05초

인라인 스케이트 활주속력에 따른 T-Stop의 운동학적 분석 (Kinematic Analysis of T-Stop Motion by Inline Skate Rolling Speed)

  • 한제희;우병훈;김정구;김태완;김성섭;김의환
    • 한국운동역학회지
    • /
    • v.20 no.4
    • /
    • pp.355-364
    • /
    • 2010
  • The purpose of this study was to investigate the kinematical analysis of T-stop motion by inline skate rolling speed. Six subjects were participated in the experiment(age: $35.0{\pm}3.3$ yrs, weight: $72.70{\pm}5.1\;kg$, height: $176.30{\pm}3.1\;cm$, career: $10.00{\pm}2.5$ yrs). The study method adopted 3-dimensional analysis and 2 cameras for filming to analyze the required displacement of center of mass, displacement of right and left hip joint, displacement of right and left knee joint, displacement of trunk tilt using by APAS. The results were as follows; In anterior-posterior displacement of COM, the faster rolling speed, the longer displacement at phase 2. In vertical displacement of COM, the faster rolling speed, the lower displacement. In medial-lateral displacement of COM, there was no significant on rolling speed. In angular displacement of right thigh segment, the faster rolling speed, the bigger displacement in X and Z axis. In angular displacement of left thigh segment, the faster rolling speed, the lower displacement in X axis. In angular displacement of right shank segment, the faster rolling speed, the bigger displacement in Z axis. In angular displacement of left shank segment, the faster rolling speed, the bigger displacement in X and Y axis. In angular displacement of trunk segment, the faster rolling speed, the bigger displacement in Z axis.

비탄성 이력응답 및 지진특성을 반영한 변위증폭계수에 관한 연구 (A Study of Displacement Amplification Factors Considering Hysteretic Behavior of Structural Systems and Earthquake Characteristics)

  • 송종걸;김학수
    • 한국전산구조공학회:학술대회논문집
    • /
    • /
    • pp.777-782
    • /
    • 2007
  • Displacement amplification factor can be used to estimate inelastic displacement demands from elastic displacement demands, The simple formula for displacement amplification factor considering hysteretic behavior of structural system and earthquake characteristics is proposed. And the effects of several parameters such as displacement ductility, strain hardening ratio, period, characteristics of earthquakes and hysteretic models for the displacement amplification factor are evaluated. Accuracy of the proposed formula is evaluated by comparing the displacement amplification factors estimated by existing and proposed formula with those calculated from inelastic time history analysis. The displacement amplification factors by proposed formulas provide a good agreement with those calculated by inelastic time history analysis.

  • PDF

영상 신호에서 패턴인식을 이용한 다중 포인트 변위측정 (Displacement Measurement of Multi-Point Using a Pattern Recognition from Video Signal)

  • 전형섭;최영철;박종원
    • 한국소음진동공학회:학술대회논문집
    • /
    • /
    • pp.675-680
    • /
    • 2008
  • This paper proposes a way to measure the displacement of a multi-point by using a pattern recognition from video signal. Generally in measuring displacement, gab sensor, which is a displacement sensor, is used. However, it is difficult to measure displacement by using a common sensor in places where it is unsuitable to attach a sensor, such as high-temperature areas or radioactive places. In this kind of places, non-contact methods should be used to measure displacement and in this study, images of CCD camera were used. When displacement is measure by using camera images, it is possible to measure displacement with a non-contact method. It is simple to install and multi-point displacement measuring device so that it is advantageous to solve problems of spatial constraints.

  • PDF

속도시간이력을 이용한 변위 추정 알고리즘에 관한 실험적 검증 (Experimental Verification of Displacement Estimation Algorithm using Velocity Time History)

  • 조성호;전준창;황선근;이희현
    • 한국안전학회지
    • /
    • v.30 no.4
    • /
    • pp.99-105
    • /
    • 2015
  • In this study, displacement estimation algorithm, which is not requiring an absolute reference point unlike the conventional displacement measurement method, is developed using the geophone. To estimate displacement of the bridge, measured velocity time signal is integrated in the frequency domain. And, the estimated displacement is compared with the measured result using a conventional method. Based on the dynamic field test results, it was found that the estimated displacement by the present algorithm is similar to that of a conventional method. The displacement estimation algorithm proposed in this paper can be effectively applied to measure the displacement of a structure, which is difficult to install a displacement transducer at the fixed point.

Displacement aging component-based stability analysis for the concrete dam

  • Huang, Xiaofei;Zheng, Dongjian;Yang, Meng;Gu, Hao;Su, Huaizhi;Cui, Xinbo;Cao, Wenhan
    • Geomechanics and Engineering
    • /
    • v.14 no.3
    • /
    • pp.241-246
    • /
    • 2018
  • The displacement monitoring data series reconstruction method was developed under equal water level effects based on displacement monitoring data of concrete dams. A dam displacement variation equation was set up under the action of temperature and aging factors by optimized analysis techniques and then the dam displacement hydraulic pressure components can be separated. Through the dynamic adjustment of temperature and aging effect factors, the aging component isolation method of dam displacement was developed. Utilizing the isolated dam displacement aging components, the dam stability model was established. Then, the dam stability criterion was put forward based on convergence and divergence of dam displacement aging components and catastrophe theory. The validity of the proposed method was finally verified combined with the case study.

완만한 이력거동 시스템에 대한 비탄성 변위비의 평가 (Evaluation of Inelastic Displacement Ratios for Smooth Hysteretic Behavior Systems)

  • 송종걸
    • 한국지진공학회논문집
    • /
    • v.15 no.3
    • /
    • pp.11-26
    • /
    • 2011
  • 비탄성 변위비는 최대 선형 탄성변위에 대한 최대 비탄성 변위의 비로서 정의된다. 비탄성 변위비는 비탄성 응답의 계산을 하지 않고도 최대 탄성변위로부터 최대 비탄성변위를 직접적으로 평가 가능하게 한다. 비탄성 변위비에 대한 기존의 연구는 이선형 또는 강성저하시스템과 같은 분할선형시스템에 국한되었다. 본 논문에서는 근거리 및 원거리 지진을 받는 완만한 곡선형 이력거동 시스템의 비탄성 변위비에 대하여 연구하였다. 두 단계의 회귀분석 과정을 통하여 비탄성 변위비에 대한 간편식을 제안하였다.

Vision-based remote 6-DOF structural displacement monitoring system using a unique marker

  • Jeon, Haemin;Kim, Youngjae;Lee, Donghwa;Myung, Hyun
    • Smart Structures and Systems
    • /
    • v.13 no.6
    • /
    • pp.927-942
    • /
    • 2014
  • Structural displacement is an important indicator for assessing structural safety. For structural displacement monitoring, vision-based displacement measurement systems have been widely developed; however, most systems estimate only 1 or 2-DOF translational displacement. To monitor the 6-DOF structural displacement with high accuracy, a vision-based displacement measurement system with a uniquely designed marker is proposed in this paper. The system is composed of a uniquely designed marker and a camera with a zooming capability, and relative translational and rotational displacement between the marker and the camera is estimated by finding a homography transformation. The novel marker is designed to make the system robust to measurement noise based on a sensitivity analysis of the conventional marker and it has been verified through Monte Carlo simulation results. The performance of the displacement estimation has been verified through two kinds of experimental tests; using a shaking table and a motorized stage. The results show that the system estimates the structural 6-DOF displacement, especially the translational displacement in Z-axis, with high accuracy in real time and is robust to measurement noise.

디지털콘텐츠 제작을 위한 Displacement map의 음영정보 분석 (Analysis of Infoshade of Displacement Map for Making Digital Contents)

  • 박경철
    • 한국콘텐츠학회논문지
    • /
    • v.11 no.8
    • /
    • pp.59-67
    • /
    • 2011
  • 디지털 콘텐츠가 디자인, 만화, 영상 등의 각 분야에서 대세로 자리 잡아 가고 있는 추세이다. 많은 디지털콘텐츠가 포토샵에서 제작되거나 일부 작업 과정에서 활용되고 있다. 포토샵의 다양한 기능 중에서도 특히 채널은 원리적 이해와 사용법이 어렵지만 중요한 고급 기능임에는 분명하다. 채널과 Displacement map은 채널의 음영정보를 사용하고 있다는 점에서 공통점이 있다. 음영정보는 '흰색과 검은색 및 흰색과 검은색 사이의 무채색으로 구성되는 256단계의 정보'이다. 채널의 음영정보는 Displacement map에서 '이동'의 개념으로 사용된다. Displacement map은 'Displacement map 이미지'의 채널이 가진 음영정보를 분석하여 Displacement map이 적용되는 '원본 이미지'의 픽셀을 이동시킨다. 이것은 이동시키는 특성을 활용하기 위하여 채널의 음영정보를 만들 수 있음을 의미한다. 본 연구는 대표적인 CG 프로그램인 포토샵의 Displacement map에서 음영정보가 적용되는 원리를 분석하고자하였다. 공학적인 알고리즘 연구보다는 채널의 음영정보가 어떤 원리로 적용되는 지를 분석하여 음영정보의 원리적 이해를 정리하고 분석하는데 의미를 두고 있다.

지진의 특성주기를 고려한 완만한 곡선형 이력거동시스템의 비탄성 변위비 (Inelastic Displacement Ratios for Smooth Hysteretic System Considering Characteristic Period of Earthquakes)

  • 송종걸
    • 한국지진공학회논문집
    • /
    • v.17 no.1
    • /
    • pp.1-10
    • /
    • 2013
  • In order to predict inelastic displacement response without nonlinear dynamic analysis, the equal displacement rule can be used for the structures with longer natural periods than the characteristic period, $T_g$, of earthquake record. In the period range longer than $T_g$, peak displacement responses of elastic systems are equal or larger than those of inelastic systems. In the period range shorter than $T_g$, opposite trend occurs. In the equal displacement rule, it is assumed that peak displacement of inelastic system with longer natural period than $T_g$ equals to that of elastic system with same natural period. The equal displacement rule is very useful for seismic design purpose of structures with longer natural period than $T_g$. In the period range shorter than $T_g$, the peak displacement of inelastic system can be simply evaluated from the peak displacement of elastic system by using the inelastic displacement ratio, which is defined as the ratio of the peak inelastic displacement to the peak elastic displacement. Smooth hysteretic behavior is more similar to actual response of real structural system than a piece-wise linear hysteretic behavior such as bilinear or stiffness degrading behaviors. In this paper, the inelastic displacement ratios of the smooth hysteretic behavior system are evaluated for far-fault and near-fault earthquakes. The simple formula of inelastic displacement ratio considering the effect of $T_g$ is proposed.

무차원계수를 이용한 왕복펌프의 성능평가 방법 개발 (A development off displacement pump performance evaluation method by using dimensionless parameter)

  • 조희근;윤진하;전종길;김경원;이인복
    • 한국정밀공학회:학술대회논문집
    • /
    • /
    • pp.731-734
    • /
    • 2002
  • There have been no obvious design criteria of high efficient displacement pump using a dimensionless parameter which can represent many physical aspect of displacement pump could be very useful to estimate displacement pump performance. Many dimensionless analysis methods have been developed in fluid dynamics, machine design and so on. In this study a new dimensionless parameter is developed for estimate displacement pump performance and efficiency, until now to evaluate the performance of displacement pumps which are widely used in industry field, primarily experimental methods have been used. The dimensionless parameter contains many physical information about pump design. For example, they are the relation between flow rate and power, displacement operation displacement and size, inlet and outlet valve size. And the developed dimensionless functions are induced from numerical method.

  • PDF