• 제목, 요약, 키워드: bi-directional damper

검색결과 10건 처리시간 0.042초

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
    • /
    • v.20 no.3
    • /
    • pp.287-295
    • /
    • 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.

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
    • /
    • v.19 no.8
    • /
    • pp.850-856
    • /
    • 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.

TMD와 TLCD를 이용한 2방향 감쇠기의 동적특성 (Dynamic Characteristic of A Bi-dirctional Damper Using A Tuned Mass Damper and A Tuned Liquid Column Damper)

  • 이성경;민경원;박은천
    • 한국전산구조공학회논문집
    • /
    • v.21 no.6
    • /
    • pp.589-596
    • /
    • 2008
  • 본 연구에서는 동조질량감쇠기(TMD)와 동조액체 기둥감쇠기(TLCD)로 구성된 2방향 감쇠기의 제어성능을 실험적으로 검증하였다. 본 연구에 사용된 감쇠기는 한방향으로는 TMD로 거동하고, 다른 직교하는 방향에서는 TLCD로 거동하여 제어력이 발생하는 감쇠기이다. 우선, 제작된 감쇠기의 동적특성과 TMD와 TLCD에 의해 발생하는 제어력들의 연계효과를 조사하기 위한 진동대 실험을 수행하였다. 다음으로 이러한 실험결과를 바탕으로 감쇠기의 동적특성에 영향을 미치는 파라미터를 정량적으로 평가하였다. 본 연구에서 사용된 감쇠기가 입사각을 갖는 진동에 의해 가진될 때 TMD와 TLCD에 의해 연계된 제어력이 발생하는 것을 진동대 실험결과로부터 확인하였다. 또한, 감쇠기가 건축물의 2방향 응답제어에도 효과적으로 사용될 수 있음을 확인하였다.

건축구조물의 2방향 진동제어를 위한 동조액체질량감쇠기 (A Tuned Liquid Mass Damper(TLMD) for Controlling Bi-directional Responses of a Building Structure)

  • 허재성;박은천;이상현;이성경;김홍진;조봉호;조지성;김동영;민경원
    • 한국소음진동공학회논문집
    • /
    • v.18 no.3
    • /
    • pp.345-355
    • /
    • 2008
  • This paper presents a design of a tuned liquid mass damper(TLMD) for controlling bi-directional response of high-rise building structure subjected to windload. The proposed damper behaves as a tuned mass damper(TMD) of which mass is regarded as the mass of a tuned liquid column damper(TLCD) and the case wall of the TLCD itself in one direction and the TLCD in the other direction. Because the proposed device has coupled design parameter along two orthogonal directions, it is very important to select designing components by optimal fine tuning. In the designing TLMD, for easy maintenance, the rubber-bearing with small springs was applied in TMD direction. In this study, the Songdo New City Tower 1A in Korea, which has been designed and constructed two TLCDs in order to control bi-directional response, was chosen as the model building structure. The results of rotation test proved the effectiveness of bi-directional behavior of TLMD.

건축구조물의 2방향 진동제어를 위한 TLMD 제어성능평가 (Performance Evaluation of Tuned Liquid Mass Damper for Reducing Bi-directional Responses of a Building Structure)

  • 허재성;이성경;박은천;이상현;김홍진;조지성;조봉호;민경원
    • 한국소음진동공학회:학술대회논문집
    • /
    • /
    • pp.432-441
    • /
    • 2008
  • In this study, the control performance of a Tuned Liquid Mass Damper(TLMD) manufactured to reduce the orthogonal bi-directional responses of building structures was experimentally evaluated. the TLMD using only one control device reduce bi-directional responses of building structures by making the TLMD behave as TMD and TLCD to the strong and weak axial direction of building structures. first, the control performance was evaluated by forcing sinusoidal waves to a test model that the TLMD is installed on the scale-downed building structure. Second, the real-time hybrid shaking table test was performed to evaluate the performance of the vibration control system made up of numerical part as a scale-downed building structural model and a physical experimental part as a TLMD. the superiority of bi-directional vibration control performance of the manufactured TLMD was verified by comparing the uncontrolled and controlled results of these tests.

  • PDF

Performance of a 3D pendulum tuned mass damper in offshore wind turbines under multiple hazards and system variations

  • Sun, Chao;Jahangiri, Vahid;Sun, Hui
    • Smart Structures and Systems
    • /
    • v.24 no.1
    • /
    • pp.53-65
    • /
    • 2019
  • Misaligned wind-wave and seismic loading render offshore wind turbines suffering from excessive bi-directional vibration. However, most of existing research in this field focused on unidirectional vibration mitigation, which is insufficient for research and real application. Based on the authors' previous work (Sun and Jahangiri 2018), the present study uses a three dimensional pendulum tuned mass damper (3d-PTMD) to mitigate the nacelle structural response in the fore-aft and side-side directions under wind, wave and near-fault ground motions. An analytical model of the offshore wind turbine coupled with the 3d-PTMD is established wherein the interaction between the blades and the tower is modelled. Aerodynamic loading is computed using the Blade Element Momentum (BEM) method where the Prandtl's tip loss factor and the Glauert correction are considered. Wave loading is computed using Morison equation in collaboration with the strip theory. Performance of the 3d-PTMD is examined on a National Renewable Energy Lab (NREL) monopile 5 MW baseline wind turbine under misaligned wind-wave and near-fault ground motions. The robustness of the mitigation performance of the 3d-PTMD under system variations is studied. Dual linear TMDs are used for comparison. Research results show that the 3d-PTMD responds more rapidly and provides better mitigation of the bi-directional response caused by misaligned wind, wave and near-fault ground motions. Under system variations, the 3d-PTMD is found to be more robust than the dual linear TMDs to overcome the detuning effect. Moreover, the 3d-PTMD with a mass ratio of 2% can mitigate the short-term fatigue damage of the offshore wind turbine tower by up to 90%.

1 개의 TLD 를 이용한 건물의 양방향 진동제어 (Bi-directional response control of a building using one TLD)

  • 민경원;이성경;박은천
    • 한국전산구조공학회:학술대회논문집
    • /
    • /
    • pp.119-124
    • /
    • 2009
  • This paper proposes a tuned liquid column sloshing damper(TLCSD) and presents experimental results to evaluate its control performance. The proposed damper acts as a tuned liquid column damper(TLCD) and a tuned liquid damper(TLD), respectively, in both principal axes of building structures. Shaking table test was performed to grasp its dynamic characteristics. Testing results showed that under inclined incident excitations, a TLCSD used in this study have dynamic characteristics coupled by both TLCD and TLD.

  • PDF

Optimal assessment and location of tuned mass dampers for seismic response control of a plan-asymmetrical building

  • Desu, Nagendra Babu;Dutta, Anjan;Deb, S.K.
    • Structural Engineering and Mechanics
    • /
    • v.26 no.4
    • /
    • pp.459-477
    • /
    • 2007
  • A bi-directional tuned mass damper (BTMD) in which a mass connected by two translational springs and two viscous dampers in two orthogonal directions has been introduced to control coupled lateral and torsional vibrations of asymmetric building. An efficient control strategy has been presented in this context to control displacements as well as acceleration responses of asymmetric buildings having asymmetry in both plan and elevation. The building is idealized as a simplified 3D model with two translational and a rotational degrees of freedom for each floor. The principles of rigid body transformation have been incorporated to account for eccentricity between center of mass and center of rigidity. The effective and robust design of BTMD for controlling the vibrations in structures has been presented. The redundancy of optimum design has been checked. Non dominated sorting genetic algorithm (NSGA) has been used for tuning optimum stages and locations of BTMDs and its parameters for control of vibration of seismically excited buildings. The optimal locations have been observed to be reasonably compact and practically implementable.

새로운 형태의 동조액체댐퍼에 의한 단자유도 건물의 양방향 응답제어 (Reducing bi-directional response of SDOF building by new type Tuned Liquid Damper)

  • 이혜리;민경원
    • 한국전산구조공학회:학술대회논문집
    • /
    • /
    • pp.778-782
    • /
    • 2010
  • 본 논문에서는 TLD와 TLCD를 사용한 하나의 액체 감쇠기를 이용하여 건물의 양방향 응답 제어를 연구하였다. 초고층 건물이 풍하중을 받을때는 풍방향과 풍직각방향으로 진동하여 두 개의 댐퍼를 필요로 한다. 이 논문에서 제안된 댐퍼는 건물의 양방향 응답을 하나의 감쇠기로 제어할 수 있다는 장점이 있다. 이 댐퍼의 TLCD는 건물의 주축방향으로 TLD는 주축으로 직각되는 다른 방향으로 거동을 하게 된다. 실험을 통해 양방향 감쇠기를 사용하여 건물의 양방향 응답제어를 증명하였다. 첫 번째로 양방향 감쇠기에 의한 건물의 응답제어를 알기 위한 진동대 실험을 실시하였다. 진동대 가속도를 입력으로 하고 단자유도 건물의 가속도를 출력으로 하는 전달함수를 통해 결과를 나타내었다. 실험 결과 이 연구에서 제안된 감쇠기는 단자유도 건물의 양방향 응답을 제어하였고, 비틀림 응답도 제어 하였다.

  • PDF

외부접합형 카고메 감쇠시스템을 사용한 철근콘크리트 라멘조 공동주택 비탄성 지진 응답 제어 (Inelastic Seismic Response Control of the RC Framed Apartment Building Structures Using Exterior-Installed Kagome Damping System)

  • 허무원;천영수;이상현
    • 한국구조물진단유지관리공학회 논문집
    • /
    • v.20 no.3
    • /
    • pp.58-65
    • /
    • 2016
  • 이 논문은 지진응답을 감소시키기 위해 외부설치형 카고메 감쇠시스템의 유효성을 비선형 동적 해석 결과를 통해 나타내었다. 이전의 연구에 의해 제안된 카고메 감쇠시스템을 활용하여 본 연구에서는 등방성, 이선형 이력특성 및 설치구성이 새롭게 제안하였다. 또한, 외부접합형 카고메 감쇠시스템의 여러 가지 효과를 15층 및 20층 철근콘크리트 라멘조 아파트를 대상으로 검증하였다. 원구조물에 대한 감쇠장치 지지구조물의 강성비, 감쇠장치의 수량 및 설치 층수는 설계변수로 고려하였다. 수치해석결과, EKDS는 기존의 한 방향 층간에 설치되는 감쇠시스템과 비교할 때 더 작은 수를 적용하여도 두 방향의 지진하중을 감소시키는데 매우 효과적임을 입증되었다.