Optimum placement of piezoelectric material in piezoactuator design
| Autor: | Emílio Carlos Nelli Silva, Shinji Nishiwaki, Ronny C. Carbonari |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Optimal design
Engineering Optimization problem business.industry Isotropy Topology optimization Structural engineering Condensed Matter Physics Piezoelectricity Atomic and Molecular Physics and Optics Finite element method Computer Science::Other Planar Mechanics of Materials Control theory Signal Processing General Materials Science Piezoelectric actuators Electrical and Electronic Engineering business Civil and Structural Engineering |
| Zdroj: | SMART MATERIALS & STRUCTURES. 16(1):207-220 |
| ISSN: | 0964-1726 |
| Popis: | Piezoelectric actuators offer significant promise in a wide range of applications. The piezoelectric actuators considered in this work essentially consist of a flexible structure actuated by piezoceramics that must generate output displacement and force at a certain specified direction and point of the domain. The design of these piezoelectric actuators is complex, and a systematic design method such as topology optimization has been successfully applied in recent years, with appropriate formulation of the optimization problem to obtain optimized designs. However, in these previous design formulations, the position of the piezoceramic is usually kept fixed in the design domain and only the flexible part of the structure is designed by distributing some non-piezoelectric material (aluminum, for example). This imposes a constraint in the position of the piezoelectric material in the optimization problem, limiting the optimality of the solution. Thus, in this work, a formulation that allows the simultaneous distribution of non-piezoelectric and piezoelectric material in the design domain to achieve certain specified actuation movements will be presented. The optimization problem is posed as the simultaneous search for an optimal topology of a flexible structure as well as the optimal position of the piezoceramic in the design domain and optimal rotation angles of piezoceramic material axes that maximize output displacements or output forces in a certain specified direction and point of the domain. The method is implemented based on the SIMP ('solid isotropic material with penalization') material model where fictitious densities are interpolated in each finite element, providing a continuum material distribution in the domain. The examples presented are limited to two-dimensional models, since most of the applications for such piezoelectric actuators are planar devices. |
| Databáze: | OpenAIRE |
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