• Title/Summary/Keyword: 댐퍼 설계

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Bouc-Wen Modeling of MR Damper by Experimental Studies (실험을 통한 MR 댐퍼의 개선된 Bouc-Wen 모델링 구현)

  • Jeon, Hyeong-Jin;Jung, Seul
    • Proceedings of the KIEE Conference
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    • 2008.10b
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    • pp.163-164
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    • 2008
  • 본 논문에서는 MR(Magneto-rheological)댐퍼의 특성을 파악하고 모델링하기 위해 실험 장치를 설계 및 제작을 하였다. 그리고 MR댐퍼의 특성 중 전항복(pre-yieid) 영역에서의 속도가 증가하거나 및 감소할 때의 감쇠력의 차이를 보이는 이력현상을 모델링하기 위해 개선된 Bouc-Wen 모델을 이용하였다. 다양한 실험을 통해 Bouc-Wen 모델의 변수들을 이용하여 구하였다.

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The Evaluation of Seismic Performance and the Design of Initial Member Sections for Architectural Steel Structures (건축 강구조물의 초기 부재단면 설계 및 내진성능에 관한 연구)

  • Lee, Sang-Ju;Lee, Dong-Woo;Han, Sang-Eul
    • Journal of Korean Association for Spatial Structures
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    • v.6 no.1 s.19
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    • pp.101-109
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    • 2006
  • An initial member sections of steel structures is selected by experience of expert building structural designers. And appropriate member section is designed by repeat calculation through structural analysis. Therefore an initial assumption of member section is necessary for saving the time for structural design and is important to acquire safety of building structures. Also brace damper are generally used to prevent or decrease stuctural damage by its hysteretic behavior in building structures subjected to strong earthquake. Based on plastic design, the initial section of members for architectural steel structures with hysteretic damper braces is presented and seismic effect of structural behavior by the ratio of damper stiffness to structural story stiffness is estimated in this paper.

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Control of torsional vibration for propulsion shafting with delayed engine acceleration by optimum design of a viscous-spring damper (점성-스프링 댐퍼 최적화 설계를 이용한 엔진 증속지연 특성을 갖는 추진축계 비틀림진동 제어)

  • Kim, Yang-Gon;Hwang, Sang-Jae;Kim, Young-Hwan;Kim, Sang-Won;Cho, Kwon-Hae;Kim, Ue-Kan
    • Journal of Advanced Marine Engineering and Technology
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    • v.40 no.7
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    • pp.580-586
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    • 2016
  • The ultra-long stroke engine was developed to generate greater power at lower speeds than previous designs to enhance the propulsion efficiency. The torsional exciting force, on the other hand, was increased significantly. Therefore, it is possible to control the torsional vibration of its shaft system equipped with the fuel efficient ultra-long stroke engine by adopting a damper although the torsional vibration could be controlled adequately by applying tuning and turning wheels on the engine previously. In this paper, the dynamic characteristics of a viscous-spring damper used to control the torsional vibration of the corresponding shaft system are reviewed and then examined to determine what vibration characteristics might be used to optimize the viscous-spring damper. In some cases, operators of eco-ships have recently experienced the problem of delayed RPM acceleration. It has been suggested that the proper measures for controlling the torsional vibration in the shaft system should involve adjusting the design parameters of its damper determined by the optimum damper design theory to avoid the fatigue damage of shafts.

Experimental Verification of a Liquid Damper with Changeable Natural Frequency for Building Response Control (고유진동수 조절이 가능한 액체댐퍼의 건물응답 제어실험)

  • Kim, Dong-Ik;Min, Kyung-Won;Park, Ji-Hun;Kim, Jae-Keon;Hwang, Kyu-Seok;Gil, Yong-Sik
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.25 no.4
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    • pp.323-330
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    • 2012
  • This study deals with the experiments of liquid dampers with multi cells whose vertical tubes are divided into several square columns for easily changing natural frequencies. Shaking table test is performed to verify control effectiveness of the dampers which are installed on a building structure. To design liquid dampers, a 64-story building structure is reduced to a SDOF structure with 1/20 of similitude laws based on acceleration. The structure model is made up to adjust its mass and stiffness easily, with separate mass and drive parts. Mass parts indicate real structure's weights and drive parts indicate real structure's stiffness with springs and LM guides. Manufactured liquid damper has 18 cells and its natural frequency ranges are 0.65Hz to 0.81Hz. Shaking table test is carried out with one way excitation to compare with only accelerations of a large-scale structure and a structure installed with liquid dampers. Control performance of the liquid damper is expressed by the transfer function from shaking table accelerations to the large-scale structure ones. Testing results show that the liquid damper reduced a large-scale structure's response by tuned natural frequencies.

Research on Coupling Control of Adjacent Buildings under Multiple Hazards (다중재난하중을 받는 인접건물의 연결제어에 대한 연구)

  • Kwag, Shinyoung;Kim, Hyun-Su
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.5
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    • pp.36-41
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    • 2016
  • In this study, numerical analyses were used to investigate the performance of a coupling control method for the dynamic responses of adjacent buildings under multiple hazards. Numerical simulations were done using the earthquake loads of regions with strong seismicity in Los Angeles, California, and the wind loads in regions with strong winds in Charleston, North Carolina. The artificial earthquake and wind loads were made using SIMQKE and Kaimal Spectrum based on ASCE 7-10. Ten-story and twenty-story adjacent buildings were selected as example structures, and nonlinear hysteretic dampers were used to connect them. The Bouc-Wen model was used to model the nonlinear hysteretic dampers. The results show that the proposed control method could effectively reduce the dynamic responses, and the optimal control designs were different for each hazard.

A Study on the Structural Performance of Steel Plate Damper (강재 플레이트 댐퍼의 구조성능에 관한 연구)

  • Youn, Ilro;Kim, Cheol Hwan;Do, Cheon Gi;Jang, Woong
    • Journal of Korean Society of Steel Construction
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    • v.29 no.2
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    • pp.159-167
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    • 2017
  • The earthquake which was recently occurred in Kyeongju area caused serious damage to several structures. It is needed to improve capacity against seismic of existing structures constructed before providing seismic design code. This paper is to verify the structural characteristics proposed diagonal steel dampers for existing structures to enhance the seismic resist capacity. The experimental and analysis study were undertaken to obtain the load-displacement relationships of diagonal steel dampers. The valuables were angels and spaces of strut. As a result, it is verified that the proposed steel damper is effective in the seismic reinforcement of existing structures.

Development of Air Spring Damper System(ASDS) (공기 스프링 댐퍼 시스템(ASDS)의 개발)

  • Kim, Dong Baek;Park, Heung Sik
    • Journal of the Society of Disaster Information
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    • v.17 no.4
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    • pp.829-838
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    • 2021
  • Purpose: The Air Spring Damper System (ASDS) is proposed when existing concrete structures that have not been seismic resistant for economic and technical reasons or low-rise concrete structures that are difficult to earthquake. Method: To conduct a study on the damping force antigen in the kinetic equation of free vibration, we analyze whether this device has damping ability as a damper experimentally and theoretically, and examine the possibility of field application. Result: The air damper system is considered to be more economical than steel hysteresis dampers even if the number of dampers increases due to its easy manufacture and construction and low restrictions on shape, size, material, etc. Conclusion: In an air spring damper system, it is essential to reduce the diameter of the air inlet/outlet hole to improve the damping ratio, and in this case, if the diameter exceeds a certain lower limit, consideration of the compressibility of air is required, so further research is needed.

An Analytical Study on the Shape Development of U-shaped Steel Damper for Seismic Isolation System (면진시스템용 U형 강재댐퍼의 형상 개발에 대한 해석적 연구)

  • Quan, Chun-Ri;Oh, Sang-Hoon;Lee, Sang-Ho
    • Journal of Korean Society of Steel Construction
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    • v.22 no.1
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    • pp.43-53
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    • 2010
  • Seismic isolation is one of the most widely implemented and accepted seismic protection systems to limit or avoid damages from unforeseeable earthquakes. As an energy absorption device, however, the supplemental lead itself tends to pollute the environment. Consequently, it is predicted that the use of lead would be controlled. Considering the pollution caused by lead, several researchers are interested in the viability of using steel in place of lead. In this study, first, based on the results of a non-linear finite element analysis, the excellent deformation capacity of a very tough steel damper was demonstrated by comparing it with that of the SS400 damper and determining the effects of main parameters (the aspect ratio, thickness, and width) on the deformation capacity. Second, an optimum shape and design equation for a U-shaped damper with an opening based on stress distribution was suggested.

Design and Performance Evaluation of MR Damper for the Reducing Vibration of a Flexible Pipe Conveying Fluid (유체유동에 의한 유연한 파이프의 진동 저감을 위한 파이프 지지용 MR댐퍼의 설계 및 성능 평가)

  • Park, Woo-Cheul;Lee, Hyun-Chang
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.5
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    • pp.2100-2105
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    • 2013
  • This paper presents design and performance evaluation of MR damper for the reducing vibration of a flexible pipe conveying fluid. A novel type of MR damper which is suitable for pipe vibration characteristics is proposed and the MR damper is mathematically modeled and its damping force characteristics are evaluated. The vibration control performance of the MR damper associated with The cantilever pipe system is evaluated.

The Development of Flow Control Ventilation Damper According to the Pressure Variation of Smoke Control Room (제연구역의 압력변화에 따른 풍량제어 배출댐퍼 개발)

  • Lee, Dong-Myung
    • Fire Science and Engineering
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    • v.32 no.4
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    • pp.69-74
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    • 2018
  • This study developed a ventilation damper that can control flow rate according to pressure differential variation of the smoke control room in order to improve problems related to existing smoke management systems and maximizing performance of smoke management systems. The development damper was tested for verification of utility and performance. The supply flow of the developed ventilation damper was increased by about 1 to 5%. The results prove the effectiveness of the flow control ventilation damper by providing stable flow over the designed flow of the fan in the smoke control room. In addition, the study acquired the original technology for a flow control ventilation damper.