• Title/Summary/Keyword: 지지구조물

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Dynamic Analysis for Railway Bridge Considering Urban Maglev Train (도시형 자기부상열차 하중을 고려한 철도교량 동적해석)

  • Kim, Jung-Hun;Cha, Kyung-Ryul;Lee, Ung-Hee;Kang, Young-Jong
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2011.04a
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    • pp.481-484
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    • 2011
  • 최근 철도는 미래의 핵심교통수단이자 저탄소 녹색성장을 대표하는 교통수단으로 주목받고 있다. 그 중 자기부상열차는 바퀴 마찰에 따른 소음 진동 분진이 없는 차세대 교통수단이며, 이를 지지하는 구조물(교량)은 열차의 운행 안정성(동적거동)을 고려한 설계가 필요하다. 또한, 상부 구조물은 자기부상열차의 연행이동등분포하중을 지지하며, 이러한 하중조건을 갖는 차량이 운행할 때 상부 구조물은 설계기준사항들을 만족해야한다. 도시형 자기부상철도 토목구조물 설계기준에 의하면 도시형 자기부상철도의 운행 안정성(동적거동)을 평가하기 위한 항목들로 대상 구조물의 고유진동수, 승차감을 고려한 연직처짐 등이 요구된다. 따라서, 본 연구에서는 자기부상열차의 실 열차하중을 고려하여 연행이동등분포하중으로 철도교량의 동적거동을 검토하였으며, 설계기준을 적용하여 대상 철도 교량의 운행 안정성을 평가하였다.

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Free Vibration of Primary-Secondary Structures with Multiple Connections (다중 지지된 주-부 구조물의 자유 진동)

  • 민경원
    • Computational Structural Engineering
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    • v.4 no.4
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    • pp.97-106
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    • 1991
  • The frequency window method has been extended to include strong coupling and multiple connections between the primary structure and the secondary structures. The rational polynomial expansion of the eigenvalue problem and the analytical methods for its solution are novel and distinguish this work from other eigenvalue analysis methods. The key results are the identification of parameters which quantify the resonance and coupling characteristics; the derivation of analytical closed-form expressions describing the fundamental modal properties in the frequency windows; and the development of an iterative procedure which yields accurate convergent results for strongly-coupled primary-secondary structures.

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Influence of Column Base Rigidity on Behavior of Steel Buildings (강구조물 지지부의 강성도가 구조물 거동에 미치는 영향)

  • 권민호;박문호;장준호;박순응
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.15 no.1
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    • pp.165-172
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    • 2002
  • Generally, the steel rigid frame has been analyzed using finite element analysis tools. While many efforts have been poured into the understanding and accurate prediction for the nonlinear behavior of the columns and beam-columns connections, the base of the columns are modeled as simply hinged or fixed. However, the base of the steel columns practically is neither fixed not hinged. It behaves as semi-rigid. In this paper, the supports of the columns we modeled as semi-rigid and the importance of such approach in moment-resisting columns is evaluated. Two typical buildings designed by the US specification are modeled and analyzed by the finite element based on stiffness method and flexibility method. The column bases of three-story buildings are modeled as rotational springs with a varying degree of stiffness and strength that simulates the semi-rigidity of the base. Depending on the degree of stiffness and strength, the semi-rigidity varies from the hinged to the fixed. Buildings with semi-rigid column bases behaves similarly to the building with fixed bases. It has been numerically observed through the pushover and nonlinear time history analyses that the decrease of the stiffness of the column base induces the rotational demand on the int air beams. an increase of rotation demands on the first store connections and lead to a soft-story mechanists Due often to the construction and environmental effects, undesired reduction of column base stiffness may cause an increase of rotation demands on the first store connections and lead to a soft-story mechanism.

Study on Fatigue Life Estimation for Aircraft Engine Support Structure (항공기 엔진 지지구조물의 피로수명 해석에 관한 연구)

  • Hur, Jang-Wook
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.11
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    • pp.1667-1674
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    • 2010
  • The fatigue life is estimated while determining the reliability of aircraft structures. In this study, the estimation of fatigue life was carried out on the basis of a cumulative damage theory; the working S-N curve and the equivalent stress on the engine support structure significantly affect the safety of the aircraft. The maximum stress observed was 1,080 MPa in the case of scissors link under crash load condition, and there was a 5% margin for the allowable stress corresponding to the temperature reduction factor. The maximum stress was 876 MPa, and the stress equation coefficient had a maximum value of 0.019 MPa/N in the case of scissors link under fatigue loads. In the results of the fatigue life analysis, the safety life in a fretting area of scissors link upper part was 416,667 flight hour, and other parts showed to infinite life. Therefore, it was demonstrated that the fatigue life requirement of aircraft engine support structure (scissors link, straight link) could be satisfied.

Power Transmission from a Vibrating Mass to a Supporting Elate through Isolators (능동 및 수동격리기를 적용한 진동계에 있어서 힘의 전달에 관한 연구)

  • Jin-Woo Lee;Colin H. Hansen
    • Journal of the Korean Society of Safety
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    • v.16 no.4
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    • pp.200-207
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    • 2001
  • The transmission of harmonic vibratory power form a vibrating rigid body into a supporting plate through passive and active isolators is investigated theoretically and experimentally. The theoretical model allows for the transmission of vertical and horizontal harmonic forces and moments about all three coordinate sun. The experiment is to use vibration actuators attached to the intermediate mass of the two-stage mount to minimize the rotational and translational vibration of the intermediate mass. The performance is done by measuring the vibration at the error sensors due to the primary vibration source and measuring the transfer functions from the control sources to the error sensors. Results show that over a frequence range from 1 to 100Hz, transmission into the supporting plate can be reduced substantially by employing in parallel with existing passive isolators, active isolators adjusted to provide appropriate control force amplitudes.

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A Study on the Optical Bench for LEO Earth Observation Satellite (저궤도 지구관측위성의 광학탑재체 지지구조물 설계 연구)

  • Kim, Kyung-Won;Kim, Jin-Hee;Rhee, Ju-Hun;Jin, Ik-Min;Kim, Jong-Wo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.05a
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    • pp.805-808
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    • 2005
  • This paper is a study on an optical bench satisfying stiffness and thermal pointing error requirements for LEO earth observation satellite. According to shape and stiffness requirements, optical bench type 1 is designed. Because type 1 does not satisfy the thermal pointing error requirement, an optical bench type 2 is suggested. Although the type 2 has better results than type 1, it still does not meet the thermal pointing error requirement. Using the results of optical bench type 1&2, the optical bench type 3 is finally designed, which satisfies both the stiffness and thermal pointing error requirements.

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FEM Analysis of AC/DC Converter for ITER Superconducting Magnet (ITER 초전도자석 전원공급장치의 구조설계를 위한 유한요소 해석)

  • Jung, W.;Lee, S.;Jo, S.;Park, H.;Chung, I.;Hwang, K.;Liu, H.;Oh, J.S.;Choi, J.;Suh, J.H.
    • Proceedings of the KIPE Conference
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    • 2012.11a
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    • pp.239-240
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    • 2012
  • ITER 초전도자석 전원공급장치는 대전류를 흘리기 위한 자체 지지구조 버스바와 이를 지지하기 위한 구조물로 구성된다. 장치설계에 있어 버스바와 지지구조물은 단락 시 전자기력에 대한 내성, 통전전류에 의한 버스바 발열 등의 요구조건을 만족하여야 한다. 본 논문은 ITER 초전도자석 전원공급장치에 유한요소해석을 적용하여 여러 요구조건에 부합하는 설계의 적합성을 검증한다.

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Finite Element Analysis on the Bearing Loads and Stress of Safety Helmets with an Extruded Structure (정상부에 돌출구조물을 구비한 안전모의 지지하중 및 응력에 관한 유한요소해석)

  • Kim, Chung Kyun
    • Journal of the Korean Institute of Gas
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    • v.20 no.2
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    • pp.43-48
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    • 2016
  • This paper presents the finite element analysis results for bearing loads and stress distributions of safety helmets with an extruded structure. Five different analysis models with given same displacement load of 9.4mm have been analyzed for bearing loads and maximum von Mises stress. In these models, model 4 and model 5 are recommended as a maximum bearing load and low maximum stress for given displacement load of 9.4mm.

Dynamic Test Results Assessment on the Optical Bench of LEO Satellite (저궤도 지구관측위성의 광학탑재체 지지구조물 동환경시험 결과분석)

  • Kim, Kyung-Won;Kim, Jin-Hee;Rhee, Ju-Hun;Kim, Sun-Won;Jin, Ik-Min;Park, Jong-Sung
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2006.05a
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    • pp.242-245
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    • 2006
  • This paper is an assessment on the dynamic test results of optical bench for LEO satellite. According to the design requirements, optical bench was designed and manufactured. Dynamic test was performed to verify stability of optical bench. Low level random vibration test, sine burst test and sine vibration test are carried out to identify dynamic characteristics and to verify static strength and safety under quasi-static load conditions. From the result it can be stated that the optical bench is well qualified under the launch environmental conditions.

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Dynamic Behavior on Transition Zone of the Railway Bridge-earthwork by Shape of Transition Zone (구조물 접속부 형상에 따른 철도 교량-토공 접속부의 동적거동)

  • Jung, Kwangsu;Ahn, Kwangkuk;Kang, Hongsig
    • Journal of the Korean GEO-environmental Society
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    • v.22 no.4
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    • pp.5-13
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    • 2021
  • The transition is the zone where support stiffness suddenly increases in the railway industry. If the support stiffness increases, differential settlement will occur at the transition due to difference of stiffness, and the differential settlement causes problems for the train running safety and the roadbed that supports the track. In particular, a study on differential settlement at bridge-earthwork transition was only conducted to considering railway load in most cases. However, these studies have not taken account of earthquake despite earthquake has been occurred frequently in the recent, and it is necessary to consider earthquake. Therefore, in this study numerical analysis has been performed by changing the inclination of approach block, which determines the shape of the transition, and earthwork in order to verify the effect of the shape of the transition on the dynamic behavior at the bridge-earthwork transition. The result shows that the dynamic behavior at the bridge-earthwork transition was affected by the shape of transition.