• Title, Summary, Keyword: Displacement

Search Result 11,408, Processing Time 0.06 seconds

Deformation Analysis of Excavated Behind Ground by The Artificial Displacement Method (II) - Numerical Analysis and Application - (강제변위법을 이용한 굴착배면지반의 변형해석(II) - 수치해석 및 적용성 -)

  • Yun, Jung-Mann
    • Journal of the Korean Geosynthetics Society
    • /
    • v.7 no.3
    • /
    • pp.31-40
    • /
    • 2008
  • The deformation behavior of the excavated behind ground due to the displacement shape of retention walls is predicted by numerical analysis, which can be performed using the artificial displacement method with elasto-plastic constitutive model. The displacement shape of the behind ground around the retention wall is similar to the displacement shape of the retention wall. However, far from the retention wall, it changes to the displacement shape of cantilever. The deformation (the settlement, the lateral movement) of the excavated behind ground can be decreased by restraining the upper displacement of the retention wall. The displacement shape of the retention wall due to excavation affects on the plastic failure zone and decreasing zone of stability of the excavated behind ground.

  • PDF

Improvement for Response Delays of Displacement Magnifier in Jetting Dispenser (젯팅 디스펜서 변위확대장치의 응답지연 개선 연구)

  • Ha, Myeong-Woo;Lee, Kwang-Hee;Hong, Seung-Min;Lee, Chul-Hee
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.26 no.5
    • /
    • pp.546-551
    • /
    • 2016
  • The objective of this study is to investigate the response delays between piezo-stack actuator and the displacement magnifier of jetting dispenser and to reduce its falling time in terms of displacement optimization. The dispenser is driven by the dual piezo-stack actuators with a hinge lever mechanism to precisely control flow rate of the working fluid (3000 cP). It is commonly found that piezo actuator-driven jetting dispensers involving viscous working fluids have displacement optimization problem for ideal performance. The response delay of the system is caused by the phenomenon that the displacement magnifier cannot exactly follow the motion of the piezo actuators. The response delay may lower the performance of the system due to the inaccurate discharge of working fluid or even damages to the system itself due to inharmonious motion of piezo actuators with lever system. To reduce its response delay, a new displacement profile obtained from displacement optimization is suggested; its performance is tested through finite element analysis; and experiments are carried out to verify the performance of the obtained displacement profile.

Study on Evaluating Displacement Tolerance of Sky-bridge in Tall Buildings (고층 스카이브리지의 변위 허용치 산정에 대한 연구)

  • Kim, Yun Gon
    • Journal of the Architectural Institute of Korea Structure & Construction
    • /
    • v.36 no.4
    • /
    • pp.135-142
    • /
    • 2020
  • The new method for evaluating the displacement tolerance of sky-bridges with pin-roller type supports was proposed considering both return period of phase difference between connected buildings and geometrical characteristics of skybridge. Because displacement tolerance is relative value, which is most affected by the phase difference of the connected buildings, the dynamic response of these building with time history analysis should be evaluated. However, the initial phase could not be specified, so the result of displacement tolerance would be varied with respect to initial value. Thus, the tolerance can be reasonably evaluated SRSS calculation with design displacements based on statistical approach and of each building. In addition, the geometrical characteristics of sky-bridge should be considered because the transverse displacement of sky-bridge span causes the shear deformation of the bridge and longitudinal displacement tolerance cannot release the shear deformation. Therefore, the some pin-end support in sky-bridge should have longitudinal displacement tolerance to accommodate the shear deformation. By resolving this shear deformation, it is possible not only to accommodate transverse displacement, but also to avoid the complicated joint details such as both pot bearing and guided supports with shear key.

Displacement Measurement by Multiplexed Optical Loss -based Fiber Optic Sensor (다중화된 광 손실형 광섬유 센서에 의한 변위의 측정)

  • 권일범;김치엽;유정애
    • Proceedings of the Computational Structural Engineering Institute Conference
    • /
    • /
    • pp.556-565
    • /
    • 2003
  • Light losses in optical fibers are investigated by a fiber optic OTDR (Optical Time Domain Reflectometry) sensor system to develop fiber optic probes for structural displacement measurement. The displacement sensitivity was determined by the measurements of fiber-bending loss according to the gage length changes of the displacement sensor. The fiber optic displacement probe was manufactured to verify the feasibility of the structural displacement measurement.

  • PDF

A RADIOGRAPHIC STUDY ON THE CONDYLAR DISPLACEMENT FROM CENTRIC RELATION TO CENTRIC OCCLUSION (중심위에서 중심교합으로 전위될 때의 과두의 변위에 관한 방사선학적 연구)

  • Rhyee In Suk;Ahn Hyung Kyu
    • The Journal of Korean Academy of Maxillofacial Radiology
    • /
    • v.12 no.1
    • /
    • pp.15-20
    • /
    • 1982
  • The purpose of this study was to investigate the normal range of condylar displacement of normal adults. The author has observed two roentgenographic images of condylar head taken by transcranial projection. Two roentgenographic images are centric occlusion and centric relation. The results were obtained as follow: 1. Total subjects are 72 condyles. The condylar displacement from centric relation to centric occlusion was shown in 65 condyles (90%) anteriorly. 59 condyles (82%) inferiorly. Two condyles (3%) showed neither anterior displacement nor inferior displacement. 2. The average displacement of right condyles was 0.54±0.06㎜ anteriorly, 0.34±0.05㎜ inferiorly. The average displacement of left condyles was 0.74±0.09㎜ anteriorly, 0.45±0.05㎜ inferiorly. 3. The subjects of synmetrical displacement are 7 cases (20%) anteriorly, 2 cases (6%) inferiorly.

  • PDF

Analysis of Linear-type Ultrasonic Motor Using A Finite Element Method (유한요소해석 프로그램에 의한 리니어 초음파 모터의 변위량 해석)

  • 이동준;임태빈;강성택;김영욱;임기조
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • /
    • pp.33-36
    • /
    • 1998
  • This paper is a study on a linear ultrasonic motor with a first longitudinal$(L_1)$ and fourth bending $(B_4)$ double-mode rectangular plate. The stator vibrator is composed of an elastic material plate and of a piezo-ceramic element having a motion by electrical excitation. Each strain vector differs by $90^{\circ}$ generate travelling wave with the elliptical displacement motion of a point on the surface. To magnify displacement of longitudinal direction in elliptical displacement motion, the motor has a mechanism of the.displacement enlargement. In this paper, the vibration shape of the stator is simulated using the finite element method. A detailed model considered of the piezoelectric effect and of the exact geometry of the stator is used to calculate the displacement. The position of displacement mechanism is decided by the maximum displacement.

  • PDF

The Measurement Method of Lateral Displacement in Bridge Abutment. (교량구조물의 측방이동 측정방법에 관한 연구)

  • 장용채
    • Journal of Korean Port Research
    • /
    • v.14 no.1
    • /
    • pp.115-124
    • /
    • 2000
  • This study is a suggest a measurement method of lateral displacement, which can be used to judge the stability of bridge abutment on soil undergoing lateral movement. The abutment of bridge on soft foundation makes lateral movement due to the settlement of back fill and lateral flow. To measure the displacement of such a abutment, there are a lot of indirect method for measurement such as survey of leveling or inclinometer gauge around the abutment. But all of them are not sufficient to confirm the ground behavior and measure the exact lateral behavior of structure. As making the structure and pile cooperatively by measuring the movement of lateral displacement, for measuring the abutment displacement precisely by using the inclinometer. In this work, we try to suggest efficient measuring method of abutment displacement and its application.

  • PDF

A Study on the Selection Displacement Curve Function for Cam Design of Double Cam Type Beating Mechanism Based on Cam Mechanism Simulation (캠 기구의 시뮬레이션을 이용한 더블캠 방식 바디침 기구의 캠 설계를 위한 변위선도함수 선정에 관한 연구)

  • 김종수;윤호업
    • Textile Science and Engineering
    • /
    • v.39 no.6
    • /
    • pp.790-803
    • /
    • 2002
  • A beating motion is one of the main motions of the rapier loom. The beating motion locates yarn to a desired position after weft insertion motion. There are two kinds of mechanism for beating motion. One is crank lever type and the other is double cam type. Crank lever type usually used low speed rapier loom. In other hand double cam type used high speed rapier loom. Cam part in double cam type beating mechanism is very important. Cam design starts at displacement curve design. This study investigated four different displacement curves selected from various kinds of displacement curve functions. Thus this paper proposed how to select optimized displacement curve function for double cam type beating mechanism of high speed rapier loom using cam simulation. And then, presents the comparable data of pressure angle, cam contact force and driving torque per each of displacement curve to determine the optimized displacement curve function.

Small Displacement Measurement by Holographic Interferometry (홀로그래피 간섭계를 이용한 미소변위 측정)

  • 이해중;황운봉;박현철
    • Transactions of the Korean Society of Mechanical Engineers
    • /
    • v.16 no.5
    • /
    • pp.864-872
    • /
    • 1992
  • Two double-exposure holograms are made in the different view angle at the same time, using laser, by overlapping before and after the static deformation. These images are transfered to the computer. The fringe patterns of holograms are recognized by image processing and each component of the displacement and strain at each point of the specimen is obtained by vector analysis, and the results were presented in the graphical form. For the verification of all the ment process, the two experimental cases, the in-plane displacement by tension load and the out-of-plane displacement by bending load, are measured. These results are compared with the exact solution.

An Analysis on Volumetric Displacement of Hydraulic Gerotor Motor (제로터 유압 모터의 용량에 관한 연구)

  • Kim, D.M.;Ham, Y.B.;Kim, S.D.
    • 유공압시스템학회:학술대회논문집
    • /
    • /
    • pp.39-43
    • /
    • 2010
  • It is hard and complex to analytically derive a volumetric displacement formula of a gerotor hydraulic motor because geometric shape of its rotors is complicate. An analytical method about the volumetric displacement is proposed in this work, which is relatively easy and based upon two physical concepts. The first one is energy conservation between hydraulic input energy of the motor and mechanical output energy. The second concept is torque equilibrium with respect to inner and outer rotors. The proposed formula about the volumetric displacement is verified by comparing an analytical displacement and a numerical displacement for an example specification of the motor. The numerical displacement is calculated through a kind of CAD technology. The analytical formula can be utilized in analysis and design of hydraulic gerotor motors.

  • PDF