Piezoactuator design considering the optimum placement of FGM piezoelectric material

Ronny C. Carbonari, Shinji Nishiwaki, Glaucio Paulino, Emílio C.Nelli Silva

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Functionally Graded Materials (FGMs) possess continuous variation of material properties and are characterized by spatially varying microstructures. Recently, the FGM concept has been explored in piezoelectric materials to improve properties and to increase the lifetime of piezoelectric actuators. Elastic, piezoelectric, and dielectric properties are graded along the thickness of a piezoceramic FGM. Thus, the gradation of piezoceramic properties can influence the performance of piezoactuators, and an optimum gradation can be sought through optimization techniques. However, the design of these FGM piezoceramics are usually limited to simple shapes. An interesting approach to be investigated is the design of FGM piezoelectric mechanisms which essentially can be defined as a FGM structure with complex topology made of piezoelectric and non-piezoelectric material that must generate output displacement and force at a certain specified point of the domain and direction. This can be achieved by using topology optimization method. Thus, in this work, a topology optimization formulation that allows the simultaneous distribution of void and FGM piezoelectric material (made of piezoelectric and non-piezoelectric material) in the design domain, to achieve certain specified actuation movements, will be presented. The method is implemented based on the SIMP material model where fictitious densities are interpolated in each finite element, providing a continuum material distribution in the domain. The optimization algorithm employed is based on sequential linear programming (SLP) and the finite element method is based on the graded finite element concept where the properties change smoothly inside the element. This approach provides a continuum approximation of material distribution, which is appropriate to model FGMs. Some FGM piezoelectric mechanisms were designed to demonstrate the usefulness of the proposed method. Examples are limited to two-dimensional models, due to FGM manufacturing constraints and the fact that most of the applications for such FGM piezoelectric mechanisms are planar devices. An one-dimensional constraint of the material gradation is imposed to provide more realistic designs.

Original languageEnglish (US)
Title of host publicationModeling, Signal Processing, and Control for Smart Structures 2007
DOIs
StatePublished - Oct 15 2007
EventModeling, Signal Processing, and Control for Smart Structures 2007 - San Diego, CA, United States
Duration: Mar 19 2007Mar 21 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6523
ISSN (Print)0277-786X

Other

OtherModeling, Signal Processing, and Control for Smart Structures 2007
CountryUnited States
CitySan Diego, CA
Period3/19/073/21/07

Keywords

  • FGM
  • Finite element analysis
  • MEMS
  • Nanopositioners
  • Piezoelectric actuators
  • Topology optimization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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