Transcript Structural Control - University of Illinois at Urbana

```Asia-Pacific Student Summer School on Smart Structures Technology
KAIST, Daejeon, Korea
July 31 ~ August 1, 2008
Structural Control
(Lab.)
Lecturers: H.-J. Jung, H. Myung, KAIST, Korea
Assistants: S.H. Park, D.D. Jang, KAIST, Korea
Lab. Schedule
Time
7/31 (Thu)
13:00-17:00*
Topics
Warming-up: Simple TMD design contest
 Lab.: SI of cantilever beam for active control
 Demonstration: Active control using piezo-actuator
8/1 (Fri)
13:00-17:00*
Demonstration: MR damper-based semi-active
control
 Lab.: Active control using piezo-actuator
 Introduction to student competition:
Project II: Structural Control
*Group 1: 13:00-15:00
Group 2: 15:00-17:00
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Asia-Pacific Student Summer School on Smart Structures Technology
KAIST, Daejeon, Korea
July 31, 2008
Day 1.
Lecturers: H.-J. Jung, H. Myung, KAIST, Korea
Assistants: S.H. Park, D.D. Jang, KAIST, Korea
Simple TMD Design Contest
PROBLEM
 Find the optimal TMD mass within 20 min.
procedure.
 Verify the answer using the shaking table
system.
Notes
Fig. 1 SDOF structural model
1) Do not consider the damping.
2) Refer to Prof. Koo’s lecture material.
Fig. 2 TMD
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Simple TMD Design Contest
GIVEN DATA
 SDOF structural model (Fig. 1)
 Mass: 19.15 kg
 Free vibration data
- D:\08summer_school\control\TMD\free_vib.mat
(for Team 3 & Team 7: C:\08summer_school\...)
- Use Matlab to handle the data
Fig. 1 SDOF structural model
1. go to the abovementioned directory.
2. type “load free_vib”, then you have the array “str”.
(1st column: time (sec); 2nd column: displ. (mm))
 TMD (Fig. 2)
Fig. 2 TMD
 Spring coefficient: 44 N/m ⅹ 4ea
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Active Control Using PiezoActuator
 LAB.: System identification (SI) of a cantilever
beam for active control
PZT actuator
PZT sensor
Notebook
DAQ Terminal block
Power Amplifier
Experimental Setup
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Active Control Using PiezoActuator
 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) : DAY 2
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Active Control Using PiezoActuator
 DEMONSTRATION: Active control using
piezo-actuators and piezo-sensors
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PZT sensor voltage
2
1
0
-1
-2
-3
0
10
Excitation
20
30
40
uncontrolled
50
time (sec)
Excitation
60
70
80
90
100
controlled
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See You Tomorrow!
Time
8/1 (Fri)
13:00-17:00*
Topics
Demonstration: MR damper-based semi-active
control
 Lab.: Active control using piezo-actuator
 Introduction to student competition:
Project II: Structural Control
*Group 1: 13:00-15:00
Group 2: 15:00-17:00
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