• 제목/요약/키워드: Damper

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SAFE댐퍼 보강골조의 구조성능 실험적 평가 (Structural Performance of RC Frame with SAFE Damper)

  • 소병찬;이창환;주영규
    • 한국공간구조학회논문집
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    • 제15권1호
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    • pp.85-94
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    • 2015
  • SAFE damper is a hybrid damper which is comprised of a friction damper and a metallic damper. These two dampers combine to resist external energy in stages. Under minor earthquake loads, the friction damper operates alone. However, the friction damper and metallic damper dissipate the energy together when a severe earthquake occurs. In comparison with other methods for seismic retrofitting, the SAFE damper has many advantages. The SAFE damper doesn't cause damage to façade of the building, and the construction period can be reduced when retrofitting. This paper describes experiments evaluating the structural performance of the SAFE damper. From the results, it was found that the structural performance of a conventional RC bare frame can be significantly improved by the installation of the SAFE damper.

가상 동흡진기를 고려한 우등버스용 MR댐퍼의 제어 시뮬레이션 (Control simulation of MR damper for a cruise bus including the virtual dynamic damper)

  • 박성준;손정현
    • 동력기계공학회지
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    • 제15권2호
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    • pp.19-24
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    • 2011
  • In this study, a control method of MR(magneto-rheological) damper for a cruise bus is investigated. A virtual dynamic damper and a sky-hook algorithm are employed to control the damping characteristics of MR damper. Coefficients for a virtual dynamic damper are determined through the parameter identification. A quarter car model of a cruise bus is established by using ADAMS/Car program for the computer simulation. Sine wave excitation and random excitation are used to compare the controlled MR damper with the passive damper. From the simulation results, the performance of MR damper with a virtual dynamic damper is better than that of the passive damper.

방화Damper의 성능기준 고찰 (Investigation of Performent Standards for the Fire Damper)

  • 조중달
    • 방재기술
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    • 통권12호
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    • pp.10-17
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    • 1992
  • Dampers which being installad in air duct are Valume damper, fire damper, leakage rated damper, but among them fire damper and leakage rated damper are used for preventing the spread of flame, hot gas and smoke through the duct. this report is aimed to intorduce the test example of the multiple fire damper which was conducted F.I.L.K, simuetaneously to investigate the performent standards and Structure of the fire damper which settled in several countries.

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TLCD와 TSD를 이용한 새로운 형태의 양방향 감쇠기 설계변수 (Design Parameter of a New Type Bi-directional Damper Using a Tuned Liquid Column Damper and a Tuned Sloshing Damper)

  • 민경원
    • 한국소음진동공학회논문집
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    • 제19권8호
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    • pp.850-856
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    • 2009
  • A new type bi-directional damper using a tuned liquid column damper(TLCD) and a tuned sloshing damper(TSD) is introduced in this study. Two dampers are usually needed to reduce wind-induced responses of tall buildings since they are along and across wind ones. The proposed damper has the advantage of controlling both responses with one damper. One of objectives of this study is to derive analytical dynamics to investigate coupled effects due to TLCD and TSD. Another objective is to address the effect of coupled control force due to TLCD and TSD on the dynamic characteristic of the damper based on analytical dynamics. Shaking table test is undertaken to experimentally grasp dynamic characteristics of the damper under white noise excitation. Its dynamic characteristic is expressed by the transfer function from the shaking table acceleration to the control force generated from the damper. Finally, its design parameters are identified based on the coupled dynamics, which include the mass ratio of horizontal liquid column to total liquid for a TLCD, the participation factor of the fundamental liquid sloshing for a TSD and damping ratio for both cases.

해양플랜트용 H-120 등급 방화 댐퍼의 성능 실험 (Performance Experiment of H-120 Class Fire Damper for Offshore)

  • 박창수
    • 한국산업융합학회 논문집
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    • 제20권5호
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    • pp.425-430
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    • 2017
  • This study propose CAE analysis of fire damper and design of the damper control system. Through the design of the damper system for ANSYS-CFX heat transfer. As a result of the analysis, continuance equation of the damper control. Climate system. Finaily, We have obtained a fire damper solution by using orthogonal array. The fire damper of the set of fixture and alveolus are made by using a CAE software. Also, the optimum design offshore structures. The new H-120 class fire damper was designed. In the near future, fire resistance test was carried out to obtain class H-120 thermal insulation of fire dampers according to a hydrocarbon fire conditions. The test results showed that the insulation of the damper blade was an important factor in the fireproof performance of fire dampers concerning the coaming length minimum 500mm on the unexposed side as specified test standard.

해양플랜트용 H-120급 방화 댐퍼의 열전달 특성에 관한 연구 (A Study on Heat Transfer Characteristics of H-120 Class Fire Damper for Offshore Structures)

  • 장성철;이종환;이치우
    • 동력기계공학회지
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    • 제18권2호
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    • pp.19-24
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    • 2014
  • This research conducts CAE analysis of fire damper and design of damper controlling system. The prediction of the design heat transfer was done the answer of fire damper could be obtained by using continuity equation of damper controlling and orthogonal array. Through the design analysis of optimal offshore construction, new fire damper of H-120 class was designed. Accordingly, this equipment will be tested in actual offshore construction. Finally, we could obtain fire damper of optimal design with orthogonal array. With the CAE results of this research, The offshore plant will obtain eco-friendly fire damper with a method to select optimal condition of fire damper with orthogonal array.

오리피스 유체댐퍼의 수치해석적 설계 (Numerically Analytical Design of An Orifice Fluid Damper)

  • 이재천;김성훈;문석준
    • 한국정밀공학회지
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    • 제20권6호
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    • pp.105-112
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    • 2003
  • This paper presents the numerical design technology of a passive orifice fluid damper system especially for the characteristics between the damper piston velocity and the damping force. Numerical analysis with the visual interfacial modeling technique was applied into the analysis of the damper system's dynamics. A prototype orifice fluid damper was manufactured and experimentally tested to validate the numerical simulation results. The performances of various damper system schemes were investigated based on the verified numerical simulation model of orifice fluid damper.

Cable vibration control with a semiactive MR damper-numerical simulation and experimental verification

  • Wu, W.J.;Cai, C.S.
    • Structural Engineering and Mechanics
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    • 제34권5호
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    • pp.611-623
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    • 2010
  • Excessive stay cable vibrations can cause severe problems for cable-stayed bridges. In this paper a semiactive Magnetorheological (MR) damper is investigated to reduce cable vibrations. The control-oriented cable-damper model is first established; a computer simulation for the cable-damper system is carried out; and finally a MR damper is experimentally used to reduce the cable vibration in a laboratory environment using a semiactive control algorithm. Both the simulation and experimental results show that the semiactive MR damper achieves better control results than the corresponding passive damper.

초고층 건물의 양방향 풍응답 제어를 위한 액체댐퍼 실험 (Experiment of a Liquid Damper Controlling Bi-directional Wind Responses of a Tall Building)

  • 이혜리;민경원
    • 한국소음진동공학회논문집
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    • 제20권3호
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    • pp.287-295
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    • 2010
  • This study deals with the design of a bi-directional damper using a tuned liquid damper(TLD) and a tuned liquid column damper(TLCD) for a SDOF building. Two dampers are usually needed to reduce wind-induced responses of tall buildings since they are along and across wind ones. The proposed damper has the advantage of controlling both responses with a single damper. The damper used in this study behaves as both a TLCD in a specific translational direction and a TLD in the other orthogonal direction. This paper presents experimental verification to confirm its control performance. First, shaking table test is carried out to investigate reducing responses by the damper. Control performance of the damper is expressed by the transfer function from shaking table accelerations to SDOF building ones. Testing results show that the damper reduced bi-directional responses of a SDOF building. Also, it reduced torsion responses.

Two-level control system of toggle braces having pipe damper and rotational friction damper

  • Ata Abdollahpour;Seyed Mehdi Zahrai
    • Structural Engineering and Mechanics
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    • 제86권6호
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    • pp.739-750
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    • 2023
  • This study examines the two-level behavior of the toggle brace damper within a steel frame having a yielding pipe damper and rotational friction damper. The proposed system has two kinds of fuse for energy dissipation in two stages. In this mechanism, rotational friction damper rather than hinged connection is used in toggle brace system, connected to a pipe damper with a limited gap. In order to create a gap, bolted connection with the slotted hole is used, such that first a specific movement of the rotational friction damper solely is engaged but with an increase in movement, the yielding damper is also involved. The performance of the system is such that at the beginning of loading the rotational friction damper, as the first fuse, absorbs energy and with increasing the input load and further movement of the frame, yielding damper as the second fuse, along with rotational friction damper would dissipate the input energy. The models created by ABAQUS are subjected to cyclic and seismic loading. Considering the results obtained, the flexibility of the hybrid two-level system is more comparable to the conventional toggle brace damper. Moreover, this system sustains longer lateral displacements. The energy dissipation of these two systems is modeled in multi-story frames in SAP2000 software and their performance is analyzed using time-history analysis. According to the results, permanent relocations of the roof in the two-level system, in comparison with toggle brace damper system in 2, 5, and 8-story building frames, in average, decrease by 15, 55, and 37% respectively. This amount in a 5-story building frame under the earthquakes with one-third scale decreases by 64%.