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♥ case of basic specimen - smart plate
• 200x500x1.25 mm cantilevered aluminum plate
on which the strain gauges (SGD-5/350-LY11,
Omega Engineering) and MFC actuators
(M8557P1MFC, Smart Materials) are bonded
• signal conditioners (OM5-WBS-3-C, Omega
Engineering) are converting strain gages bridge
signals to high level and for bridge supply
• TREK high voltage amplifiers (PA05039,
—500 V÷ +1500V) for the MFC actuators supply
• PC with implemented control laws in LabView:
robust LQG/LTR or robust H∞ control
• Data Acquisition Card (NI PCIe-6259) used for
processing the signals from conditioners and for
applying to the MFC actuator the control signal,
amplified by the high voltage amplifiers
• the first four natural frequencies (Hz): 5, 26, 31,
157, pseudo-identification by impulse excitation
♥ case of an Eppler 211 airfoil • semi-span – 650 mm, chord – 200 mm
• wing skin: composite material E-glass
texture/orto- ophatlic resin, 4 layers and
0.14 mm thicknes each
• wing spars placed at 30%, respectively, 65% of
chord, made of the same material
• the skin and the spars are ANSYS modeled as shell
99-2D–element
• wing equivalent E = 9.28X109 N/mp
• the first three natural frequencies (Hz) and
modes:
21 (bending), 108 (yaw), 128 (bending), pseudo-
identification by impulse excitation
• two pairs of collocated MFC- 8557 S1, a pair for
excitation and a pair for control; thermal analogy is
used for modeling
• TREK high voltage amplifiers (PA05039,
–500 V÷+1500V) for the MFC actuators supply
• accelerometer B&K
• a PC with implemented control laws in LabView:
robust LQG/LTR or robust control
♥ case of 2DOF system with active control • the rigidity is simulated by a pair of identical
cantilevered plates, which supports the so-called
S-shape plates deformation, thus ensuring a plane-
parallel movement of the masses (and a very good
guide, implicitly)
• excitation actuator — VTS 75M Modal Test System
• excitation actuator — electrohydraulic servo
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SMART PLATE
active vibration control:
robust LQG/LTR control synthesis
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robust H∞ control synthesis
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