Hysteresis is an important nonlinear effect exhibited by piezoelectric actuators and its control has been drawing considerable attention. This paper presents the development of an inversion based model predictive control to compensate for piezoelectric actuator hysteresis. Experiments were carried out to verify the effectiveness of the developed control method. The result obtained shows that th...

Because of the complex nature of structural characteristics, damage detection in honeycomb sandwich structures inherently carries many challenges. In the study, effects of debonding on leaky guided wave propagation in honeycomb sandwich structures are first studied by using the finite element method. A surface-bonded piezoelectric wafer actuator/sensor network is used for elastic-guided wave pr...

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A Lamb wave-based crack detection method for aluminum plates health monitoring is developed in this paper. Piezoelectric disks are employed to actuate and capture the Lamb wave signals. The position of crack is assumed to be aligned with the sensor and actuator.  Extraction of high quality experimental results of lamb wave propagation in a plate-like structure is considerably complicated due to...

Piezoelectric cantilevers have been in great demand in sensor and actuator applications. The tip displacement of the cantilever is the most important and sensitive parameter in the actuation mode. Hence, in this study a bimorph cantilever beam has been chosen as the element of study consisting of two active piezoelectric layers of PVDF bonded together. An attempt has been made to establish the ...

Title of Dissertation: SMART FOAM FOR ACTIVE VIBRATION AND NOISE CONTROL Wael Nabil Akl, Doctor of Philosophy, 2004 Dissertation Directed By: Professor Amr M. Baz Department Mechanical Engineering A new class of smart foams is introduced to simultaneously control the vibration and noise radiation from flexible plates coupled with acoustic cavities. The proposed smart foam consists of a passive ...

Piezoelectric stick-slip actuators have become the foundation of modern micromanipulation. Due to difficulty in closed-loop control with manipulators that use piezoelectric stick-slip actuators, methods for open-loop control with a human in the loop have been developed. The utility of such methods depends directly on the accuracy of the open-loop models of the manipulator. Prior research has sh...

Hysteresis of a piezoelectric actuator is ratedependent. Most hysteresis models are based on elementary rate-independent operators and are not suitable for modeling actuator behavior across a wide frequency band. This work proposes a rate-dependent modified PrandtlIshlinskii (PI) operator to account for the hysteresis of a piezoelectric actuator at varying frequency. We have shown experimentall...

Cement-based piezoelectric composite, has been widely used as a kind of smart material in structural health monitoring and active vibration control. However, transient dynamic loads such as impact loads may cause serious damage to the composite. Considering the electrode layer effect, this paper aimed to investigate the theoretical response of a 2-2 cement-based piezoelectric composite sensor s...

mechanical energy, such as vibration into electrical energy which can be used to power up devices in a smart dust sensing network. This piezoelectric mechanism exhibits great potentials to resolve many energy supply problems in sensor network to supply energy to radio frequency (RF) circuits, microcontroller, micro electromechanical systems (MEMS) and sensors placed in remote locations. This pa...