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Department of Mechanical EngineeringUniversity of Houston
A National Science Foundation Sponsored Project
Determination of Damping Ratio of Nanocomposite Plates Using Piezoceramics
Determination of Damping Ratio of Nanocomposite Plates Using Piezoceramics
Christiana ChangHaichang Gu, PhD
Gangbing Song, PhD
Christiana ChangHaichang Gu, PhD
Gangbing Song, PhD
big
pic
ture
Currentcomposites
can be improvedfor many
applications.
Currentcomposites
can be improvedfor many
applications.
b i g
p
i c
t u
r
eVibration affects
passenger comfort and safety.
Vibration affects passenger comfort and
safety.
Project GoalsProject Goalsob
jecti
ve
• Obtain time-domain and frequency-domain responses of nanocompostite plates
• Determine damping ratio of nanocomposite plates
• Analyze results for relationship between weight % of Carbon Nanofiber (CNF) and damping ratio
Figure 1: Carbon Nanofiber (CNF) Paper (Gou, Song, Gu1)
1 Gou, J. and G. Song and H. Gu. “Development of Carbon Nanopaper Based Nanocomposites for Structural Damping Applications.” 2007.backg
rou
nd
Figure 2: Schematic of Vacuum-Assisted Resin Transform Molding Formed
Nanocomposite Composition
Vaccum-Assisted Resin Transform MoldingVaccum-Assisted Resin Transform Molding
backg
rou
nd
- + - + No Voltage
Direction of Polarity
Applied Voltage
opposite polarity Applied Voltage
same as polarity
Direction of Polarity
Direction of Polarity
-+ - +No voltage generated
Directionof Polarity
Voltage generatedsame as polarity
Voltage generatedopposite polarity
Directionof Polarity
Directionof Polarity
F F
Figure 2: Schematic of Lead Zirconate Titanate (PZT) Operation (Olmi, Song, Mo2)
2 Olmi, C and G. Song and Y.L. Mo. “Development of an Innovative Smart Vibration Platform.” The Proceedings of the 4th Japan-China-US
Symposium on Structural Control and Monitoring”, Oct. 16-17, 2006.
PiezoceramicsPiezoceramics
meth
od
sdSpace Data Acquisition Board
ADC DAC
InputOutput
Power Amplifier
dSpace Enabled PC
Sensor
Actuator
Nanocomposite Plate
ConnectionsConnections
0.0062
0.0097
0.0146
0.0102
0.000
0.002
0.004
0.006
0.008
0.010
0.012
0.014
0.016
-0.25 0.25 0.75 1.25 1.75
Weight % CNF
Da
mp
ing
Ra
tio
resu
lts
Average Damping Ratio vs. Weight % CNFAverage Damping Ratio vs. Weight % CNF
0 0.5 1.0 1.5
con
clu
sio
ns
ConclusionsConclusions• Carbon Nanofibers (CNF) in the
composite matrix significantly damp vibration magnitude
• As weight % of CNF increases, magnitude of response decreases
• As weight % of CNF increases, damping ratio increases
• VARTM molding is capable of producing damped CNF nanocomposite
g r
a t
I t
u d
e
AcknowledgementsAcknowledgements• National Science Foundation for Funding
of REU
• University of Houston – Host of Program
• Smart Materials and Structures Lab – Host of Project
• Dr. Jan Gou, University of South Alabama – Supplier of Nanocomposite Plates
• REU Participants – For being there!