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케이블 진동 저감을 위한 스마트 복합 감쇠 시스템의 성능평가

2006 년도 한국지진공학회 학술발표회. 케이블 진동 저감을 위한 스마트 복합 감쇠 시스템의 성능평가. 박철민 , 한국과학기술원 건설 및 환경공학과 석사과정 정형조 , 세종대학교 건설 및 환경공학과 조교수 고만기 , 공주대학교 토목공학과 조교수 이인원 , 한국과학기술원 건설 및 환경공학과 교수. Contents. Introduction Smart Hybrid Damping System System Characteristics Numerical Analysis Conclusions.

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케이블 진동 저감을 위한 스마트 복합 감쇠 시스템의 성능평가

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  1. 2006년도 한국지진공학회 학술발표회 케이블 진동 저감을 위한 스마트 복합 감쇠 시스템의 성능평가 박철민, 한국과학기술원 건설 및 환경공학과 석사과정 정형조, 세종대학교 건설 및 환경공학과 조교수 고만기, 공주대학교 토목공학과 조교수 이인원, 한국과학기술원 건설 및 환경공학과 교수

  2. Contents • Introduction • Smart Hybrid Damping System • System Characteristics • Numerical Analysis • Conclusions Structural Dynamics & Vibration Control Lab., KAIST, Korea

  3. Introduction • Structural Control Systems • Passive control system • Active control system • Semiactive control system Structural Dynamics & Vibration Control Lab., KAIST, Korea

  4. Passive control system • Vibration control without external power • No adaptability to various external load • Examples: Lead rubber bearing, Viscous damper • Active control system • Vibration control with external power • Adaptability to various loading conditions • Large external power • Examples: Active mass damper, Hydraulic actuator Structural Dynamics & Vibration Control Lab., KAIST, Korea

  5. Semiactive control system • Change of the characteristics of control devices • Small external power • Reliability of passive system with adaptability of active system • Examples: ER/MR damper, Variable-orifice damper Structural Dynamics & Vibration Control Lab., KAIST, Korea

  6. Smart Hybrid Damping System • Characteristics of Smart hybrid damping system • Vibration control without external power • Adaptability to various loading conditions • Smart hybrid damping system • EMI System (Electromagnetic Induction System) • Toggle System (Scissor-Jack-Damper System) Structural Dynamics & Vibration Control Lab., KAIST, Korea

  7. MR Damper Current External power • Schematic of EMI System -Conventional MR damper Structural Dynamics & Vibration Control Lab., KAIST, Korea

  8. MR Damper Induced Current Magnetic Field Damper Deformation • MR damper with EMI system : changes kinetic energy of MR damper to electric energy Structural Dynamics & Vibration Control Lab., KAIST, Korea

  9. Smart Hybrid Damping System • Magnification factor (1) • Damping force exerted on the cable (2) Structural Dynamics & Vibration Control Lab., KAIST, Korea

  10. Electromotive force induced by EMI system (3) (4) (5) where, :damper deformation : width of area covered by magnetic field Structural Dynamics & Vibration Control Lab., KAIST, Korea

  11. L T, m, c where, : transverse deflection of the cable : cable tension : cable mass per unit length : cable damping coefficient per unit length : transverse damper force at location • System Characteristics  Flat-sag cable (Christenson 2001) Structural Dynamics & Vibration Control Lab., KAIST, Korea

  12. Cable characteristics Structural Dynamics & Vibration Control Lab., KAIST, Korea

  13. Numerical Analysis  Considered control system • Linear viscous damper • Passive-mode MR damper • EMI system • Smart hybrid damping system  Conditions • Loading conditions - : gaussianwhite noise process - : wind load Structural Dynamics & Vibration Control Lab., KAIST, Korea

  14. Loading condition • External load • External load is assumed as sinusoidal load to cause • mainly first-mode response in the absence of a damper Structural Dynamics & Vibration Control Lab., KAIST, Korea

  15. Performances under gaussian white noise - damper location : 2% of cable length Structural Dynamics & Vibration Control Lab., KAIST, Korea

  16. Performances under gaussian white noise Structural Dynamics & Vibration Control Lab., KAIST, Korea

  17. Loading condition • Wind load (Yang et al., 3rd generation benchmarks for building)

  18. Performances under wind load - damper location : 2% of cable length Structural Dynamics & Vibration Control Lab., KAIST, Korea

  19. Performances under wind load Structural Dynamics & Vibration Control Lab., KAIST, Korea

  20. Conclusions • Loading conditions - Gaussianwhite noise process : similar optimal performances - Wind load : better performance of smart passive damping system • Smart hybrid damping system - guarantee its performance - no external power - smaller damper capacity and size of EMI system Structural Dynamics & Vibration Control Lab., KAIST, Korea

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