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장지은 , 한국과학기술원 건설 및 환경공학과 석사과정 정형조 , 세종대학교 토목환경공학과 조교수 정 운 , 현대건설기술개발원 주임연구원

MR 유체 감쇠기를 이용한 사장 케이블 제진 시스템의 실험적 검증. 장지은 , 한국과학기술원 건설 및 환경공학과 석사과정 정형조 , 세종대학교 토목환경공학과 조교수 정 운 , 현대건설기술개발원 주임연구원 이인원 , 한국과학기술원 건설 및 환경공학과 교수. Objectives. To experimentally verify the performance of the MR damper-based control systems for suppressing vibration of

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장지은 , 한국과학기술원 건설 및 환경공학과 석사과정 정형조 , 세종대학교 토목환경공학과 조교수 정 운 , 현대건설기술개발원 주임연구원

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  1. MR 유체 감쇠기를 이용한 사장 케이블 제진 시스템의 실험적 검증 장지은, 한국과학기술원 건설 및 환경공학과 석사과정 정형조, 세종대학교 토목환경공학과 조교수 정 운, 현대건설기술개발원 주임연구원 이인원, 한국과학기술원 건설 및 환경공학과 교수 Structural Dynamics & Vibration Control Lab., KAIST, Korea

  2. Objectives • To experimentally verify the performance of the MR • damper-based control systems for suppressing vibration of • real-scaled stay cables using various semiactive control • algorithms Structural Dynamics & Vibration Control Lab., KAIST, Korea

  3. Cable Damping Experimental Setup • Schematic of smart cable damping experiment spectrum analyzer shaker flat-sag cable digital controller MR dampers Structural Dynamics & Vibration Control Lab., KAIST, Korea

  4. Cable Real-scaled cable at HICT Structural Dynamics & Vibration Control Lab., KAIST, Korea

  5. Cable model where : transverse deflection of the cable : transverse damper force at location : transverse shaker force at location : angle of inclination Structural Dynamics & Vibration Control Lab., KAIST, Korea

  6. MR damper • MR controllable friction damper • (RD-1097-01 from Lord Corporation) • Maximum force level: 100 N • Maximum voltage: 1.4 V • Location : 1.34m from bottom support Structural Dynamics & Vibration Control Lab., KAIST, Korea

  7. Cable exciting system (Kim et al. 2002) (1) Structural Dynamics & Vibration Control Lab., KAIST, Korea

  8. Controller • The controller is constructed by the Matlab Real-Time • Workshop executed in real time using MS Visual C++. • The measured responses are acquired from displacement • and acceleration sensors at damper location and converted • into digital data by NI DAQ Card-6062E. Structural Dynamics & Vibration Control Lab., KAIST, Korea

  9. Control algorithms: to calculate the command voltage input • Passive-mode cases • Semiactive control cases (Jansen and Dyke 2000) • - Clipped-optimal control algorithm • - Control based on Lyapunov stability theory • - Maximum energy dissipation algorithm • - Modulated homogeneous friction algorithm Structural Dynamics & Vibration Control Lab., KAIST, Korea

  10. Experimental Results • Displacement in free vibration Displacement (m) Time (sec) Structural Dynamics & Vibration Control Lab., KAIST, Korea

  11. Damping ratios in the passive-mode cases by Hilbert transform-based identification method Damping ratio (%) Amplitude (mm) at the location of 10.2 m away from the bottom support Structural Dynamics & Vibration Control Lab., KAIST, Korea

  12. Damping ratios in the semiactive control cases by Hilbert transform-based identification method Damping ratio (%) Amplitude (mm) at the location of 10.2 m away from the bottom support Structural Dynamics & Vibration Control Lab., KAIST, Korea

  13. Conclusions • The performance of MR damper-based control systems for suppressing vibration of stay cables is experimentally verified. • Semiactive control systems significantly improve the mitigation of stay cable vibration over the uncontrolled and the passive-off cases. • The control based on Lyapunov stability and the clipped- optimal control show slightly better performance than the passive-on case. • The Modulated homogeneous friction algorithm shows nearly the same performance as the passive-on case. Structural Dynamics & Vibration Control Lab., KAIST, Korea

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