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Day 2.

Asia-Pacific Student Summer School on Smart Structures Technology KAIST, Daejeon, Korea August 1, 2008. Day 2. Lecturers : H.-J. Jung, H. Myung, KAIST, Korea Assistants : S.H. Park, D.D. Jang, KAIST, Korea. Lab. Schedule. *Group 1: 13:00-15:00 Group 2: 15:00-17:00.

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Day 2.

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  1. Asia-Pacific Student Summer School on Smart Structures Technology KAIST, Daejeon, Korea August 1, 2008 Day 2. Lecturers: H.-J. Jung, H. Myung, KAIST, Korea Assistants: S.H. Park, D.D. Jang, KAIST, Korea

  2. Lab. Schedule *Group 1: 13:00-15:00 Group 2: 15:00-17:00

  3. MR Damper-based Semi-active Control System • Experimental Setup

  4. MR Damper-based Semi-active Control System • Control Algorithm: Modal Neuro Control

  5. MR Damper-based Semi-active Control System • Experimental Test Results

  6. MR Damper-based Semi-active Control System • Experimental Test Results

  7. Active Control Using Piezo-Actuator • Experimental Setup PZT actuator PZT sensor Notebook DAQ Terminal block Power Amplifier

  8. Active Control Using Piezo-Actuator • Experimental Setup • Structure • Cantilever beam made of aluminum (500(L) ⅹ 50(W) ⅹ 0.8(t) (mm)) • Sensor, Compensator & Exciter • Piezoceramic patch • Data Acquisition & Real Time Control • Hardware: NI DAQCard-6062E for PCMCIA & Terminal Block BNC-2110 • Software: MATLAB Real Time Workshop • Other Equipments • Power Amplifier (or High Voltage Amplifier) • Control Algorithm for active control • Positive Position Feedback (PPF) Control (sample controller)

  9. Active Control Using Piezo-Actuator • Sample Control Algorithm: PPF Control The equation of motion of the beam: where, M, C, K : mass, damping, stiffness matrix of the beam y(x,t) : displacement at the position y and time t u : control input L: the location defining vector for u The y(x,t) can be rewritten as the product of mode shape φ(x) and modal coordinate q(t). → Since, it is orthogonal among the modes, the equation of motion can be written as follows: where, : damping ratio and natural frequency of the beam. (1) (2)

  10. Active Control Using Piezo-Actuator • Sample Control Algorithm: PPF Control The control input u is generated by the PPF control scheme as Where, is the output vector from a set of PPF filters described as where, : the PPF filter frequency and damping ratio. Then, the equation (2) can be rewritten as Since, is square matrix, let’s define a new signal , which satisfies where, g is the control gain. (3) (4) (5) (6)

  11. structure compensator Active Control Using Piezo-Actuator • Sample Control Algorithm: PPF Control The resultant closed-loop system can be written as (7) (8) < The block diagram of PPF controller >

  12. Active Control Using Piezo-Actuator • MATLAB Simulink Block for Experiment 1 2 4 3 5 6

  13. Active Control Using Piezo-Actuator • MATLAB Simulink Block for Experiment ① The voltage generated by PZT sensor is acquired through the DAQ card. ② PPF controller, which calculates the required control voltage. ③ If 0≤ time ≤ 20s, sine wave, else zero voltage will be provided. ④ If time ≤ 45s, the voltage determined by ③, else sine wave1 voltage will be provided. ⑤ If time ≤ 60s, the voltage determined by ④, else the voltage calculated by PPF controller will be provided. ⑥ The voltage determined by ⑤ will provided to the PZT actuator through the DAQ card.

  14. Student CompetitionProject 1: Structural Monitoring Lecturers: J.-J. Lee, Sejong Univ., K.Y. Koo, KAIST, Korea Assistants: H.J. Park, H.J. Kim, KAIST, Korea Asia-Pacific Student Summer School on Smart Structures Technology KAIST, Daejeon, Korea July 28-August 16, 2008

  15. Student Competition Project 1: Structural Monitoring • Problem Description 16

  16. Student Competition Project 1: Structural Monitoring • Evaluation Criteria* * Final evaluation criteria will be announced on 8/6 (Wed). 17

  17. Asia-Pacific Student Summer School on Smart Structures Technology KAIST, Daejeon, Korea July 28-August 16, 2008 Student CompetitionPrjoect 2: Structural Control Lecturers: H.-J. Jung, H. Myung, KAIST, Korea Assistants: S.-H. Park, D.-D. Jang, KAIST, Korea

  18. Student Competition Project 2: Structural Control • Problem Description * New specimens for student competition will be distributed on 8/6 (Wed).

  19. Student Competition Project 2: Structural Control • Evaluation Criteria* * Final evaluation criteria will be announced on 8/6 (Wed).

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