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대용량 20톤 MR 유체 감쇠기의 새로운 동적 모델

한국전산구조공학회 춘계 학술발표회 서울대학교, 서울 2002 년 4월 13일. 대용량 20톤 MR 유체 감쇠기의 새로운 동적 모델. 정형조 , 한국과학기술원 건설환경공학과 최강민 , 한국과학기술원 건설환경공학과 Guangqiang Yang , University of Notre Dame, USA Billie F. Spencer, Jr. , University of Notre Dame, USA 이인원 , 한국과학기술원 건설환경공학과. Outline. MR Damper Experimental Setup

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대용량 20톤 MR 유체 감쇠기의 새로운 동적 모델

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  1. 한국전산구조공학회 춘계 학술발표회 서울대학교, 서울 2002년 4월 13일 대용량 20톤 MR 유체 감쇠기의 새로운 동적 모델 정형조, 한국과학기술원 건설환경공학과 최강민,한국과학기술원 건설환경공학과 Guangqiang Yang, University of Notre Dame, USA Billie F. Spencer, Jr., University of Notre Dame, USA 이인원, 한국과학기술원 건설환경공학과

  2. Outline • MR Damper Experimental Setup • Experimental Results • Quasi-Static Modeling of MR Dampers • Dynamic Modeling of MR Damper System • Conclusions

  3. Introduction • Although, MR fluids were discovered in the late of 1940s, commercial applications were not developed until the Lord Corporation pioneered small-scale devices for vehicular applications in the 1990s. • Partnering with the Lord Corporation in the mid 90s, Univ. of Notre Dame (Prof. Spencer) sought to develop large-scale devices for civil infrastructural applications.

  4. Magnetorheological Fluid Damper MR Damper Experimental Setup Magnetic Choke MR Fluid F

  5. LORD RheoneticTM Seismic Damper MR-9000 Prototype 20-Ton MR Fluid Damper Thermal Expansion Accumulator 3-Stage Piston MR Fluid Diameter: 20 cm Stroke: 16 cm Power: < 50 watts, 22 volts

  6. LORD RheoneticTM Seismic Damper MR-9000 Prototype 20-Ton MR Fluid Damper Diameter: 20 cm Stroke: 16 cm Power: < 50 watts, 22 volts

  7. Experimental Setup (Yang 2001)

  8. Performance Testing Experimental Results (Yang 2001)

  9. Force-Displacement Tests under Triangular Excitation Velocity: 6 cm/sec

  10. Damper Force-Displacement and Force-Velocity Relationships under Sinusoidal Excitation Displacement Excitation: 1 inch, 0.5 Hz

  11. Frequency-Dependent Tests 1 inch displacement excitation2 A input current

  12. Constant Peak Velocity Tests Displacement excitation with peak velocity of 8 cm/s and input current of 2 A

  13. Quasi-Static Models for MR Dampers* Insufficient to describe the MR damper behavior under dynamic loading. * Yang 2001

  14. Dynamic Model of MR Damper System The dynamic model of the MR damper system is necessary for simulation of damper behavior and structural vibration control simulation with MR dampers. • Dynamic model of the current driver. • Current driver has shown to be more effective than the common voltage-driven power supply in reducing MR damper response time. • Dynamic model of the MR damper itself.

  15. Differential equation between icom and i is Dynamic Model of Current Driver

  16. Identified transfer function between icom and i is Dynamic Model of Current Driver

  17. Experimental Verification

  18. Experimental Verification

  19. Force Overshoot Force Roll-Off Displacement Lag MR Damper Response Analysis

  20. Additional Loops MR Dampers Response Analysis Force Roll-Off Force Overshoot

  21. Proposed Dynamic Model of MR Dampers

  22. Proposed Dynamic Model

  23. Damper Response with Random Displacement Excitation and Constant Current Damper Response with an Input Current of 2 A

  24. Generalization for Fluctuating Current • Six parameters are assumed to vary with the input current, which are a, a1, a2, m, n, f0. • A first-order low-pass filter is utilized to accommodate the dynamics involved in the MR fluid reaching rheological equilibrium

  25. Experimental Verification Displacement Excitation Input Current

  26. Experimental Verification Damper Response

  27. Conclusions • Magnetorheological fluid dampers are one of the most promising smart damping technologies. • Full-scale MR dampers can be effectively realized. • Proposed dynamic model of MR damper systems is effective in describing the nonlinear MR damper behavior under dynamic loading.

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