Abstract
In the paper the analysis of random vibration of an actively damped
laminated plate with functionally graded piezoelectric actuator layers is
presented. The simply supported plate is subjected to stochastic loading
represented by a uniformly distributed pressure. The random input is
assumed as a Gaussian sta- tionary and ergodic process. The actuators are
regarded as a multi-layer structure arranged of piezofiber composite
sub-layers. The sub-layers differ each other with amount of PZT
(lead-zirconate-titanate) fibers and are stacked to achieve a desired
change of the PZT volume fraction through the actuator thickness. The
gradation scheme of constituents and material properties are estimated by
parabolic and power functions. Numerical simulations are performed to
recognize the influence of the applied random excita- tions and the
actuator properties gradations on the characteristics of the stochastic
field of active plate deflection i.e. power spectral density,
autocorrelation function and variance
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