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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

On response time reduction of electrothermomechanical MEMS using topology optimization

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Author(s):
Motta Mello, Luis Augusto [1] ; Salas, Ruben Andres [1] ; Nelli Silva, Emilio Carlos [1]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, Sch Engn, Dept Mechatron & Mech Syst Engn, BR-05508 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING; v. 247, p. 93-102, 2012.
Web of Science Citations: 11
Abstract

Electrothermomechanical MEMS are essentially microactuators that operate based on the thermoelastic effect induced by the Joule heating of the structure. They can be easily fabricated and require relatively low excitation voltages. However, the actuation time of an electrothermomechanical microdevice is higher than the actuation times related to electrostatic and piezoelectric actuation principles. Thus, in this research, we propose an optimization framework based on the topology optimization method applied to transient problems, to design electrothermomechanical microactuators for response time reduction. The objective is to maximize the integral of the output displacement of the actuator, which is a function of time. The finite element equations that govern the time response of the actuators are provided. Furthermore, the Solid Isotropic Material with Penalization model and Sequential Linear Programming are employed. Finally, a smoothing filter is implemented to control the solution. Results aiming at two distinct applications suggest the proposed approach can provide more than 50% faster actuators. (C) 2012 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 11/02387-4 - Innovative piezocomposite devices for nanopositioning and energy harvesting
Grantee:Emílio Carlos Nelli Silva
Support type: Regular Research Grants
FAPESP's process: 09/18210-6 - Optimized design of electro-thermally driven microsystems considering non-linearity, response time reduction and functionally-graded materials
Grantee:Luis Augusto Motta Mello
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 10/02263-0 - Design of electrothermomechanical (ETM) MEMS using topology optimization method (TOM) considering the thermal transient response
Grantee:Ruben Andres Salas Varela
Support type: Scholarships in Brazil - Master