Type of Document Master's Thesis Author DeGuilio, Andrew Phillip URN etd-04112000-14080024 Title A Comprehensive Experimental Evaluation of Actively Controlled Piezoceramics with Positive Posistion Feedback for Structural Damping Degree Master of Science Department Mechanical Engineering Advisory Committee
Advisor Name Title Ahmadian, Mehdi Committee Chair Inman, Daniel J. Committee Member Robertshaw, Harry H. Committee Member Keywords
- Structural Vibration
- Structural Health and Damage Detection
- Shunt Circuit
- Positive Position Feedback (PPF)
- Active Control
Date of Defense 2000-03-30 Availability unrestricted AbstractA Comprehensive Experimental Evaluation of Actively Controlled Piezoceramics with Positive Position Feedback for Structural Damping ---
Andrew P. DeGuilio ---
This study evaluates the effectiveness of actively controlled piezoceramics with positive position feedback (PPF) for reducing structural vibrations. A comparison is made between active control with PPF and a parallel resistor-inductor (RLC) shunt technique. The primary objectives of this study are to:
1. Explore the feasibility of using smart
materials and fiber optics for simultaneous
health monitoring and active damping of a
representative aircraft panel.
2. Determine how optical fiber sensors may be
used to detect vibration modes of an aircraft
panel by investigating their use on a
representative test article.
3. Determine how piezoelectric patches may be
used to detect and counteract fundamental
resonances of a representative test article.
4. Determine a control algorithm and hardware
system to increase substantially the damping
in the fundamental mode of the representative
test article over a wide temperature range.
5. Develop a health-monitoring algorithm based on
fiber optic sensors to detect impedance
changes in a representative test article.
6. Make a comparison between active control with
PPF and an RLC shunt technique.
To achieve the objectives of this study, a special test rig was used to evaluate the performance of piezoelectric materials (PZTs) for vibration suppression. The test rig was used to rigidly clamp a flat 20-guage steel plate, and then excite the plate in various frequency ranges with an electromagnetic shaker. For each test, a data acquisition system was used to acquire the data to evaluate the performance of each PPF controller. Once the data was obtained, a comparison was made between active damping with PPF and passive damping with the RLC shunt technique.
The active damping technique used for this study combined piezoelectric actuators with fiber optic sensors to achieve simultaneous active control and health monitoring of a test plate. The results of the active damping tests show that piezoelectric materials can provide substantial narrowband and broadband frequency reductions, while at the same time detecting damage on the test plate. More specifically, the test results indicate that smart damping materials can decrease the fundamental mode of vibration of the test plate by 23 dB and detect damage such as a loose bolt in the clamping frame, with the addition of only 0.04 lb of PZT on the test plate. The active damping technique reduced the plate vibrations at each mode within the frequency range of interest, with only one-third the amount of piezoelectric material needed for an RLC shunt circuit technique.
Filename Size Approximate Download Time (Hours:Minutes:Seconds)
28.8 Modem 56K Modem ISDN (64 Kb) ISDN (128 Kb) Higher-speed Access Abstract.PDF 4.13 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 Acknowledgements.PDF 3.13 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 AppendixA.pdf 4.14 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 AppendixB.pdf 21.20 Kb 00:00:05 00:00:03 00:00:02 00:00:01 < 00:00:01 AppendixC.pdf 5.15 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 AppendixD.pdf 26.99 Kb 00:00:07 00:00:03 00:00:03 00:00:01 < 00:00:01 Chapter1.pdf 12.10 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01 Chapter2.pdf 117.35 Kb 00:00:32 00:00:16 00:00:14 00:00:07 < 00:00:01 Chapter3.pdf 878.06 Kb 00:04:03 00:02:05 00:01:49 00:00:54 00:00:04 Chapter4.pdf 480.07 Kb 00:02:13 00:01:08 00:01:00 00:00:30 00:00:02 Chapter5.pdf 124.62 Kb 00:00:34 00:00:17 00:00:15 00:00:07 < 00:00:01 Chapter6.pdf 12.07 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01 Contents.PDF 7.67 Kb 00:00:02 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 Cover_Page.PDF 2.43 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 List_Figures_Tables.PDF 10.35 Kb 00:00:02 00:00:01 00:00:01 < 00:00:01 < 00:00:01 References.PDF 11.46 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01 Vita.pdf 54.85 Kb 00:00:15 00:00:07 00:00:06 00:00:03 < 00:00:01
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