Design of FGM Piezoelectric Actuator Systems for Dynamic Applications by Using the Topology Optimization Method

Design of FGM Piezoelectric Actuator Systems for Dynamic Applications by Using the Topology Optimization Method

Moretti, Mariana; Amigo, Ricardo Cesare Roman; Silva, Emilio Carlos Nelli

Abstract:

Previous works have explored the application of Functionally Graded Material (FGM) concept to improve piezo-electric response of extensional devices. Increased static actuation displacements of graded structures, reduction of stress concentrations and greater reliability were shown, which motivated the study of these piezoactuators for dynamic applications. The idea behind multi-material structures subjected to dynamic loads is to take advantage of the continuous change of its property values to design new systems such as piezoelectric motors and energy harvesters tailoring speci c vibrating modes. Thus, this work focuses on optimization of graded topologies of piezoactuator devices aiming dynamic applications by using Topology Optimization Method (TOM), which is based on SIMP model to de ne the material at each point of the design domain and MMA algorithm to solve the optimization problem that aims to achieve maximum and/or minimum vibration amplitude at speci ed points of the structure for a desirable vibration mode at speci ed frequency. Two-dimensional results are presented to illustrate the method. Prototypes of optimal homogeneous and graded topologies devices are fabricated through Spark Plasma Sintering (SPS), Electrical Discharge Machining (EDM) and laser cutting techniques. Actuator displacements and resonance frequency are measured with Laser Doppler Vibrometer (LDV) and compared with numerical results.

Previous works have explored the application of Functionally Graded Material (FGM) concept to improve piezo-electric response of extensional devices. Increased static actuation displacements of graded structures, reduction of stress concentrations and greater reliability were shown, which motivated the study of these piezoactuators for dynamic applications. The idea behind multi-material structures subjected to dynamic loads is to take advantage of the continuous change of its property values to design new systems such as piezoelectric motors and energy harvesters tailoring speci c vibrating modes. Thus, this work focuses on optimization of graded topologies of piezoactuator devices aiming dynamic applications by using Topology Optimization Method (TOM), which is based on SIMP model to de ne the material at each point of the design domain and MMA algorithm to solve the optimization problem that aims to achieve maximum and/or minimum vibration amplitude at speci ed points of the structure for a desirable vibration mode at speci ed frequency. Two-dimensional results are presented to illustrate the method. Prototypes of optimal homogeneous and graded topologies devices are fabricated through Spark Plasma Sintering (SPS), Electrical Discharge Machining (EDM) and laser cutting techniques. Actuator displacements and resonance frequency are measured with Laser Doppler Vibrometer (LDV) and compared with numerical results.

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Como citar:

Moretti, Mariana; Amigo, Ricardo Cesare Roman; Silva, Emilio Carlos Nelli; "Design of FGM Piezoelectric Actuator Systems for Dynamic Applications by Using the Topology Optimization Method", p-34-34. In: Proceedings of the 13th International Symposium on Multiscale, Multifunctional and Functionally Graded Materials [=Blucher Material Science Proceedings, v.1, n.1]. São Paulo: Blucher, 2014.
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