Abstract
Piezoelectric smart structures can be modeled using commercial finite element packages. Integration of control actions into the finite element model solutions (ICFES) can be done in ANSYS by using parametric design language. Simulation results can be obtained easily in smart structures by this method. In this work, cantilever smart structures consisting of aluminum beams and lead-zirconate-titanate (PZT) patches are considered. Two cases are studied numerically and experimentally in parallel. In the first case, a smart structure with a single PZT patch is used for the free vibration control under an initial tip displacement. In the second case, a smart structure with two PZT patches is used for the forced vibration control under harmonic excitation, where one of the PZT patches is used as vibration generating shaker while the other is used as vibration controlling actuator. For the two cases, modal analyses are done using chirp signals; Control OFF and Control ON responses in the time domain are obtained for various controller gains. A non-contact laser displacement sensor and strain gauges are utilized for the feedback signals. It is observed that all the simulation results agree with the experimental results.
Highlights
Using piezoelectric smart structures for the active vibration control problems has great potential in mechanical, aircraft, space, and civil structures [1,2,3,4]
The control gain is limited by the maximum actuation voltage which can be applied to the PZT patch safely
It is possible to extract the mathematical models from the commercial finite element (FE) programs and these models can be used in other commercial control programs such as MATLAB to solve closed loop problems
Summary
Using piezoelectric smart structures for the active vibration control problems has great potential in mechanical, aircraft, space, and civil structures [1,2,3,4]. A numerical model of a beam structure with PZT actuator obtained in the ANSYS-MATLAB platform is studied for vibration attenuation [10]. Integration of control actions into the finite element model solutions (ICFES) is realized by Karag ulle et al [14] Both the FE modeling and the closed loop control actions for smart structures are achieved in ANSYS. This approach makes the active vibration control analyses in smart structures easier. In reference [15], closed loop simulation of a smart beam is performed by incorporating LQG control law into the ANSYS finite element model. Active control of free and forced vibrations in piezoelectric smart structures is realized both numerically and experimentally. The simulation results obtained with displacement and strain feedback controls are verified by the experiments
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