• 제목/요약/키워드: structural hole

검색결과 390건 처리시간 0.022초

엘리베이터 로프장력 자동조절기 개발에 관한 연구 (A Study on the Development of an Elevator Rope Tension Automatic Equalizer)

  • 김동복;김갑순
    • 한국기계가공학회지
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    • 제19권5호
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    • pp.60-66
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    • 2020
  • In this paper, we describe a rope tension automatic equalizer that automatically adjusts several rope tensions connecting the elevator car and the counterweight. The automatic rope tension equalizer is composed of a body, ram, and rope shaft. The body includes a cylinder hole, in which a ram is assembled. A rope shaft is assembled in a hole in the ram. Moreover, the rope is fixed to the rope shaft, with a hole through which fluid can pass between each cylinder hole and the hole of the body. The central concept is that the force of each rope is evenly distributed by the hydraulic pressure between the ram and the body cylinder when the rope is pulled. The thickness of the jaw connecting the small and large diameters of the body of the rope tension automatic equalizer was 15 mm based on structural analysis. The results of the representative experiment to install the produced rope tension equalizer on the elevator revealed it was possible to reduce the rope tension deviation by more than 71 kg.

Prediction of Error due to Eccentricity of Hole in Hole-Drilling Method Using Neural Network

  • Kim, Cheol;Yang, Won-Ho
    • Journal of Mechanical Science and Technology
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    • 제16권11호
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    • pp.1359-1366
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    • 2002
  • The measurement of residual stresses by the hole-drilling method has been used to evaluate residual stresses in structural members. In this method, eccentricity can usually occur between the hole center and rosette gage center. In this study, we obtained the magnitude of the error due to eccentricity of a hole through the finite element analysis. To predict the magnitude of the error due to eccentricity of a hole in the biaxial residual stress field, it could be learned through the back propagation neural network. The prediction results of the error using the trained neural network showed good agreement with FE analyzed results.

신경회로망을 이용한 구멍뚫기법의 편심 오차 예측 (Prediction for the Error of Hole Eccentricity in Hole-drilling Method Using Neural Network)

  • 김철;양원호;정기현;현철승
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 춘계학술대회논문집A
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    • pp.956-963
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    • 2001
  • The measurement of residual stresses by the hole-drilling method has been commonly used to evaluate residual stresses in structural members. In this method, eccentricity can usually occur between the hole center and rosette gage center. In this study, the error due to the hole eccentricity is predicted using the artificial neural network. The neural network has trained training examples of stress ratio, normalized eccentricity, off-centered direction and stress error using backpropagation loaming process. The prediction results of the error using the trained neural network are good agreement with FE analyzed ones.

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Shear behavior of multi-hole perfobond connectors in steel-concrete structure

  • Xing, Wei;Lin, Xiao;Shiling, Pei
    • Structural Engineering and Mechanics
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    • 제56권6호
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    • pp.983-1001
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    • 2015
  • This study focuses on the load carrying capacity and the force transfer mechanism of multi-hole perfobond shear connectors in steel-concrete composite structure. The behavior of multi-hole perfobond shear connector is more complicated than single-hole connector cases. 2 groups push-out tests were conducted. Based on the test results, behavior of the connection was analyzed and the failure mechanism was identified. Simplified iterative method and analytic solution were proposed based on force equilibrium for analyzing multi-hole perfobond shear connector performance. Finally, the sensitivity of design parameters of multi-hole perfobond shear connector was investigated. The results of this research showed that shear force distribution curve of multi-hole perfobond shear connector is near catenary. Shear forces distribution were determined by stiffness ratio of steel to concrete member, stiffness ratio of shear connector to steel member, and number of row. Efficiency coefficient was proposed to should be taking into account in different limit state.

폐톱밥 혼입 RC 유공보의 구조거동에 관한 실험적 연구 (Structural Behavior of Holed RC Beam mixed with Sawdust)

  • 손기상;이재형
    • 한국안전학회지
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    • 제21권1호
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    • pp.96-104
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    • 2006
  • This study is to find out how the sawdust-mixed RC beam with holes acts compared to two case of normal one with sawdust without hole, without sawdust. variables are ED3H1, ED3H2, ED3H1UB, ED3H2L, ED5H1, ED5H1UB, ED5H2, ED5H2L, Normal with sawdust PLA without sawdust. All sand, aggregate, cement are in accordance with KS. mixing design is also in accordance with KS and done at D remicon company in order to decrease any error in mixing manually. ED3H1 showed 7tone of maximum load capacity having only minor tensile deformation around hole, compared to the center of the beam. ED5H2L showed almost same shape of tensile strain between hole area and center of two beam length, while having 9.5 tone load capacity, incase of two holes being in the longitudinal axis. But ED5H2 in case of two holes being in same forcing direction showed 8.4tone of load capacity while having minor tensile chape around hole and normal tensile shape in the center of beam length. Two diameter 3cm hole in longitudinal axis give more effective behavior than the other case, practically. Capacity decrease between 5cm and 3cm in eccentric position form the longitudinal axis is less than percents. There is minor capacity difference between hole diameter 3cm hole, but 13tone difference of load capacity between hole diameter 5cm.

개구부를 갖는 Web판의 안정해석 (Stability Analysis of Web Plates with Openings)

  • 이수곤;김순철;김명수
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 1998년도 봄 학술발표회 논문집
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    • pp.135-140
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    • 1998
  • The buckling of the perforated web of a simply supported Η-section beam subjected to uniformly distributed load is examined by means of the finite element method. With buckling analysis results, the effect of this hole on the load carrying capacity of the beam with dimensions L/h = 11 and 13 ( L = span length h = web depth) is investigated. The parameters whose variation have been considered are hole size and location. It can be generally concluded that the buckling of the perforated web of an H-section beam is not affected seriously by the location of the perforation.

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압력도수터널 콘크리트 라이닝 구조 계산시 외수압 처리에 관한 연구 (A study on the treatment of external water pressure for the water pressure tunnel at the structural analysis of concrete lining)

  • 이현섭;이영준;서승우;황영철
    • 한국터널지하공간학회 논문집
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    • 제17권6호
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    • pp.653-664
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    • 2015
  • 압력도수터널 콘크리트 라이닝 구조계산시 암반의 이완하중, 내수압, 외수압, 건조수축, 그라우팅압 등 다양한 하중조건을 고려하는데, 아직까지 국내에는 압력도수터널에 대한 콘크리트 라이닝 구조해석을 위한 설계기준 및 체계적인 매뉴얼이 없으므로 설계자에 따라 다르게 적용되고 있는 실정이다. 특히, 도수터널은 외수압을 저감시키기 위해 Weep Hole을 설치하는 경우도 있는데, Weep Hole 설치로 인해 많은 문제점이 야기될 수도 있으므로 Weep Hole을 설치하지 않을 시 외수압 처리에 대한 합리적인 접근 방법이 필요하다. 따라서, 본 논문에서는 압력도수터널 콘크리트 라이닝 구조 계산시 외수압 처리에 대해 기존 설계사례 및 문헌 등을 분석하여 합리적이고 적절한 설계개념에 대하여 서술하였다.

The Strength Evaluation on Repaired Plain Woven CFRP Composite with a Circular Hole

  • Kwon, Oh-Heon;Park, Jun-Ho
    • International Journal of Safety
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    • 제8권1호
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    • pp.1-5
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    • 2009
  • The CFRP composite has unique properties that offer high strength and stiffness, even though it has light weight. Therefore it can be used in many industrial applications. When mechanical fasteners are used for joining composites, high stress concentrations appear near the edge of holes prepared for accommodating structural bolts and rivets. This presence of high stress concentrations can be a source of damage. The aim of this work is to evaluate fracture behavior and patterns of plain woven CFRP with circular hole and repairing patch element. The maximum strength and pattern for the plain woven carbon composite specimen with the repaired circular hole were examined. From the results, we show that repairing of the CFRP composite specimen with ($\pi$) 3~5 mm of circular hole diameter results in load rising effect and the repairing is more effective as bigger hole specimen.

역전파신경망을 이용한 구멍뚫기법의 편심 오차 예측 (Prediction for the Error due to Role Eccentricity in Hole-drilling Method Using Backpropagation Neural Network)

  • 김철;양원호;허성필;정기현
    • 대한기계학회논문집A
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    • 제26권3호
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    • pp.436-444
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    • 2002
  • The measurement of residual stresses by the hole-drilling method has been commonly used to evaluate residual stresses in structural members. In this method, eccentricity can usually occur between the hole center and rosette gage center. In this study, the error due to the hole eccentricity is predicted using the artificial neural network. The neural network has trained training examples of stress ratio, normalized eccentricity, off-centered direction and stress error using backpropagation learning process. The prediction results of the error using the trained neural network are good agreement with FE analyzed ones.

자전거 디스크 브레이크 구멍 형상 변화에 따른 구조적 내구성 해석 (Structural Durability Analysis due to Hole Configuration Variation of Bike Disc Brake)

  • 한문식;조재웅
    • 한국자동차공학회논문집
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    • 제22권5호
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    • pp.44-49
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    • 2014
  • As expansion and contraction of bike disk brake are happened continuously by temperature at repeated urgent braking. In this study, 3 kinds of model are designed according to configurations of holes and thermal durabilities on bike disk brake are investigated by comparing 3 models through temperature and thermal analyses. Maximum thermal stress happened at the disk contacted with pad and the connection part fixing disk rotor. Instead of initial state, the temperature is uniformly distributed at transient state. As the area of hole at disk rotor face becomes wider, thermal stress becomes lower at the initial state. On the other hand, in case the number of holes increases, thermal stress becomes lower at the elapsed time of 100 seconds. The thermal durability of bike disk brake can be improved by applying this study result with configurations of holes.