Prof. Emílio Carlos Nelli Silva Profile

Prof. Emílio Carlos Nelli Silva

Professor Titular at Univ of Sao Paulo

SPIE Involvement:

Author

Publications (29)

Proceedings Article | 1 March 2019 Presentation + Paper

Digital control system for two-beam optical interferometry using variable structure and sliding modes method

Stephany Lyra, Roberta Martin, Fernando Pereira, Emilio C. Silva, Marcelo C. Teixeira, Claudio Kitano

Proceedings Volume 10917, 109171N (2019) https://doi.org/10.1117/12.2510385

KEYWORDS: Feedback control, Interferometers, Control systems, Actuators, Signal detection, Interferometry, Nonlinear control, Phase shifts, Signal processing, Sensors

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Proceedings Article | 28 March 2012 Paper

On the optimization of piezoresistive plate-based sensors with distribution of piezoresistive material

Luis A. Mello, Emílio C. Silva

Proceedings Volume 8341, 83411G (2012) https://doi.org/10.1117/12.914989

KEYWORDS: Sensors, Piezoresistive sensors, Chemical elements, Aluminum, Optimization (mathematics), Finite element methods, Matrices, Atomic force microscopy, Sensor performance, Structural analysis

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Proceedings Article | 28 April 2011 Paper

Design of phononic band gaps in functionally graded piezocomposite materials by using topology optimization

Sandro Vatanabe, Emílio C. Silva

Proceedings Volume 7978, 797811 (2011) https://doi.org/10.1117/12.878851

KEYWORDS: Finite element methods, Composites, Epoxies, Structural design, Optimization (mathematics), Crystals, Transducers, Wave propagation, Mathematical modeling, Vibration control

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Proceedings Article | 10 April 2010 Paper

Design of optimized piezoelectric HDD-sliders

Paulo Nakasone, Jeonghoon Yoo, Emilio C. Silva

Proceedings Volume 7643, 76431L (2010) https://doi.org/10.1117/12.847668

KEYWORDS: Optimization (mathematics), Head, Actuators, Chemical elements, Finite element methods, Data storage, Polarization, Ferroelectric materials, Aluminum, Manufacturing

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Proceedings Article | 3 April 2009 Paper

Design of piezoelectric energy harvesting devices and laminate structures by applying topology optimization

Paulo Nakasone, Emílio C. Silva

Proceedings Volume 7286, 728603 (2009) https://doi.org/10.1117/12.816467

KEYWORDS: Electromechanical design, Energy harvesting, Transducers, Optimization (mathematics), Chemical elements, Actuators, Polarization, Finite element methods, Manufacturing, Structural design

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Proceedings Article | 22 April 2008 Paper

New configurations of oscillatory flow pumps using bimorph piezoelectric actuators

Sandro Vatanabe, Rogério Pires, Paulo Nakasone, Emílio Silva

Proceedings Volume 6930, 69300U (2008) https://doi.org/10.1117/12.776797

KEYWORDS: Actuators, Prototyping, Chemical elements, Medicine, Wave propagation, Visualization, Electronic components, Microfluidics, Computer simulations, Ceramics

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Proceedings Article | 22 April 2008 Paper

Study of oscillatory piezoelectric flow pumps using bimorph actuators with different tip geometries

Rogério Pires, Adriano Koga, Paulo Nakasone, Emílio Silva

Proceedings Volume 6930, 69300V (2008) https://doi.org/10.1117/12.776734

KEYWORDS: Actuators, Biomimetics, Manufacturing, Computer simulations, Finite element methods, Prototyping, Chemical elements, Electronic components, Cooling systems, Wave propagation

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Proceedings Article | 8 April 2008 Paper

Design of piezoelectric sensors, actuators, and energy harvesting devices using topology optimization

Paulo Nakasone, César Kiyono, Emílio Silva

Proceedings Volume 6932, 69322W (2008) https://doi.org/10.1117/12.776357

KEYWORDS: Actuators, Sensors, Optimization (mathematics), Energy harvesting, Polarization, Transducers, Smart structures, Electrodes, Ferroelectric materials, Finite element methods

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Proceedings Article | 30 April 2007 Paper

Water cooling system using a piezoelectrically actuated flow pump for a medical headlight system

Rogério Pires, Sandro Vatanabe, Amaury de Oliveira, Paulo Nakasone, Emílio Silva

Proceedings Volume 6527, 65270P (2007) https://doi.org/10.1117/12.715861

KEYWORDS: Light emitting diodes, Cooling systems, Actuators, Chemical elements, Head, Prototyping, Protactinium, Microfluidics, Finite element methods, Ferroelectric materials

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Proceedings Article | 18 April 2007 Paper

Piezoactuator design considering the optimum placement of FGM piezoelectric material

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

Proceedings Volume 6523, 65230C (2007) https://doi.org/10.1117/12.715411

KEYWORDS: Optimization (mathematics), Actuators, Dielectrics, Electrodes, Computer programming, Aluminum, Finite element methods, Manufacturing, Matrices, Instrument modeling

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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.

Proceedings Article | 11 April 2007 Paper

Viability study of oscillatory flow pumps using bimorph piezoelectric actuators

Sandro Vatanabe, Rogério Pires, Andres Choi, Paulo Nakasone, Emílio Silva

Proceedings Volume 6528, 65280X (2007) https://doi.org/10.1117/12.716127

KEYWORDS: Actuators, Prototyping, Chemical elements, Medicine, Manufacturing, Wave propagation, Ferroelectric materials, Electronic components, Microfluidics, Computer simulations

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Proceedings Article | 30 March 2006 Paper

A miniature bimorph piezoelectrically actuated flow pump

Rogério Pires, Paulo Nakasone, Cícero de Lima, Emílio Silva

Proceedings Volume 6171, 617109 (2006) https://doi.org/10.1117/12.658764

KEYWORDS: Actuators, Prototyping, Light emitting diodes, Computer simulations, Finite element methods, Ferroelectric materials, Chemical elements, Head, Electronic components, Microfluidics

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Proceedings Article | 27 March 2006 Paper

Design of functionally graded piezoelectric actuators using topology optimization

Ronny Carbonari, Emílio Silva, Glaucio Paulino

Proceedings Volume 6166, 616607 (2006) https://doi.org/10.1117/12.658562

KEYWORDS: Actuators, Finite element methods, Optimization (mathematics), Dielectrics, Gold, Electrodes, Computer programming, Matrices, Systems modeling, Composites

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Proceedings Article | 27 March 2006 Paper

Multi-actuated functionally graded piezoelectric micro-tools design using topology optimization

Ronny Carbonari, Emílio Silva, Glaucio Paulino

Proceedings Volume 6166, 616609 (2006) https://doi.org/10.1117/12.658503

KEYWORDS: Ferroelectric materials, Electrodes, Dielectrics, Finite element methods, Aluminum, Actuators, Solids, Matrices, Microsurgery, Optimization (mathematics)

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The micro-tools considered in this work consist essentially of multi-flexible structures actuated by two or more piezoceramic devices that must generate different output displacements and forces at different specified points of the domain and on different directions. The multiflexible structure acts as a mechanical transformer by amplifying and changing the direction of the piezoceramics output displacements. Micro-tools offer significant promise in a wide range of applications such as cell manipulation, microsurgery, and micro/nanotechnology processes. Although the design of these micro-tools is complicated due to the coupling among movements generated by various piezoceramics, it can be realized by means of topology optimization concepts. Recently, the concept of functionally graded materials (FGMs) has been explored in piezoelectric materials to improve performance and increase lifetime of piezoelectric actuators. Usually for an FGM piezoceramic, elastic, piezoelectric, and dielectric properties are graded along the thickness. Thus, the objective of this work is to study the influence of piezoceramic property gradation in the design of the multiflexible structures of piezoelectric micro-tools using topology optimization. The optimization problem is posed as the design of a flexible structure that maximizes different output displacements or output forces in different specified directions and points of the domain, in response to different excited piezoceramic portions: while minimizing the effects of movement coupling. The method is implemented based on the solid isotropic material with penalization (SIMP) model where fictitious densities are interpolated in each finite element, providing a continuum material distribution in the domain. As examples, designs of a single piezoactuator and an XY nano-positioner actuated by two FGM piezoceramics are considered. The resulting designs are compared with designs considering homogeneous piezoceramics. The present examples are limited to two-dimensional models because most of the applications for such micro-tools are planar devices.

Proceedings Article | 27 March 2006 Paper

Optimum place of piezoelectric material in the piezoactuator design

Ronny Carbonari, Shinji Nishiwaki, Emílio Silva

Proceedings Volume 6166, 616608 (2006) https://doi.org/10.1117/12.658470

KEYWORDS: Actuators, Finite element methods, Electrodes, Aluminum, Ferroelectric materials, Optimization (mathematics), Dielectrics, Microelectromechanical systems, Structural design, Chemical elements

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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 point of the domain and direction. The flexible structure acts as a mechanical transformer by amplifying and changing the direction of piezoceramics output displacements. The design of these piezoelectric actuators are complex and a systematic design method, such as topology optimization has been successfully applied in the latest years, with appropriate formulation of the optimization problem to obtain optimized designs. However, in these previous design formulations, piezoceramics position are usually kept fixed in the design domain and only the flexible structure is designed by distributing only some non-piezoelectric material (Aluminum, for example). This imposes a constraint in the position of piezoelectric material in the optimization problem limiting the optimality of the solution. Thus, in this work, a formulation that allows the simultaneous search for an optimal topology of a flexible structure as well as the optimal positions of the piezoceramics in the design domain, to achieve certain specified actuation movements, will be presented. This can be achieved by allowing the simultaneous distribution of non-piezoelectric and piezoelectric material in the design domain. The optimization problem is posed as the design of a flexible structure together with optimum positions of piezoelectric material that maximizes output displacements or output forces in a certain specified direction and point of the domain. 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. Presented examples are limited to two-dimensional models, once most of the applications for such piezoelectric actuators are planar devices.

Proceedings Article | 13 March 2006 Paper

Comparing two electrical impedance tomography algorithms: Gauss-Newton and topology optimization

L. A. Motta-Mello, C. R. Lima, J. C. Aya, C. N. Pai, F. S. Moura, E. C. N. Silva, R. Gonzalez-Lima

Proceedings Volume 6143, 614339 (2006) https://doi.org/10.1117/12.654059

KEYWORDS: Electrodes, Chemical elements, Finite element methods, Electroluminescence, Computer programming, Optimization (mathematics), Tomography, Inverse problems, Glasses, Partial differential equations

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Proceedings Article | 19 May 2005 Paper

Piezoresistive sensor design using topology optimization

Emilio Carlos Nelli Silva, Bernardo Reis Dreyer de Souza, Shinji Nishiwaki

Proceedings Volume 5757, (2005) https://doi.org/10.1117/12.599101

KEYWORDS: Sensors, Piezoresistive sensors, Finite element methods, Optimization (mathematics), Transducers, Wheatstone bridges, Aluminum, Microelectromechanical systems, Neodymium, Chemical elements

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Proceedings Article | 17 May 2005 Paper

Experimental and numerical characterization of multi-actuated piezoelectric device designs using topology optimization

Ronny Calixto Carbonari, Gilder Nader, Shinji Nishiwaki, Emilio Carlos Nelli Silva

Proceedings Volume 5764, (2005) https://doi.org/10.1117/12.599737

KEYWORDS: Finite element methods, Computer aided design, Manufacturing, Laser interferometry, Prototyping, Interferometers, Aluminum, Structural design, Instrument modeling, Optimization (mathematics)

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Proceedings Article | 26 July 2004 Paper

Design of piezoelectric bilaminar and C-block actuators using topology optimization

Emilio Nelli Silva, Martin Kogl

Proceedings Volume 5383, (2004) https://doi.org/10.1117/12.538424

KEYWORDS: Actuators, Polarization, Optimization (mathematics), Finite element methods, Matrices, Ferroelectric materials, Smart structures, Modeling, Electrodes, Chemical elements

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Proceedings Article | 26 July 2004 Paper

Topology optimization applied to the design of multiactuated piezoelectric microtools

Ronny Carbonari, Emilio Nelli Silva, Shinji Nishiwaki

Proceedings Volume 5383, (2004) https://doi.org/10.1117/12.538584

KEYWORDS: Finite element methods, Optimization (mathematics), Chemical elements, Microelectromechanical systems, Manufacturing, Electrodes, Actuators, 3D modeling, Microsurgery, Nanotechnology

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Proceedings Article | 13 August 2003 Paper

Analysis of the influence of tiny mirrors and mechanical holder in the interferometric measurements of piezoceramic displacements operating in a kHz range

Gilder Nader, Alessandro Shirahige, Emilio Silva, Julio Adamowski

Proceedings Volume 5053, (2003) https://doi.org/10.1117/12.484708

KEYWORDS: Mirrors, Finite element methods, Surface finishing, 3D modeling, Epoxies, Interferometers, Laser interferometry, Interferometry, Fiber optics sensors, Actuators

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Proceedings Article | 1 August 2003 Paper

Multiflexible micromanipulator design by using topology optimization

Emilio Silva, Shinji Nishiwaki

Proceedings Volume 5049, (2003) https://doi.org/10.1117/12.482727

KEYWORDS: Field emission displays, Finite element methods, Homogenization, Electrodes, Microelectromechanical systems, Structural design, Optimization (mathematics), Chemical elements, Manufacturing, Composites

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Proceedings Article | 31 July 2003 Paper

Determination of piezoelectric transducer damping by using experimental and finite element simulations

Gilder Nader, Emilio Silva, Julio Adamowski

Proceedings Volume 5052, (2003) https://doi.org/10.1117/12.483962

KEYWORDS: Transducers, Finite element methods, Actuators, Manufacturing, Aluminum, Optical simulations, Laser interferometry, Interferometers, Dielectrics, Numerical analysis

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Proceedings Article | 21 August 2001 Paper

Design of piezoelectric motors using topology optimization

Emilio Nelli Silva

Proceedings Volume 4326, (2001) https://doi.org/10.1117/12.436504

KEYWORDS: Finite element methods, Electrodes, Homogenization, Optimization (mathematics), Structural design, Composites, Actuators, 3D modeling, Aluminum, Transducers

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Proceedings Article | 16 August 2001 Paper

Experimental verification of flextensional transducers designed by using topology optimization method

Gilder Nader, Emilio Nelli Silva, Julio Adamowski

Proceedings Volume 4327, (2001) https://doi.org/10.1117/12.436549

KEYWORDS: Transducers, Finite element methods, Prototyping, Epoxies, Aluminum, Manufacturing, Interferometry, Laser interferometry, Optimization (mathematics), Electrodes

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Proceedings Article | 4 June 1999 Paper

Design of flextensional transducers using homogenization design method

Emilio Nelli Silva, Shinji Nishiwaki, Noboru Kikuchi

Proceedings Volume 3667, (1999) https://doi.org/10.1117/12.350079

KEYWORDS: Transducers, Finite element methods, Homogenization, Actuators, Chemical elements, Structural design, Optimization (mathematics), 3D modeling, Composites, Mechanical engineering

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Proceedings Article | 24 July 1998 Paper

Topology optimization applied to the design of piezocomposite materials and piezoelectric actuators

Emilio Nelli Silva, Shinji Nishiwaki, Jun Fonseca, Aaron Crumm, Guy Brady, Francisco de Espinosa, John Halloran, Noboru Kikuchi

Proceedings Volume 3323, (1998) https://doi.org/10.1117/12.316301

KEYWORDS: Actuators, Electromechanical design, Homogenization, Prototyping, Transducers, Polymers, Finite element methods, Composites, Manufacturing, Optimization (mathematics)

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Proceedings Article | 24 July 1998 Paper

Design of fluid-loaded piezoelectric transducers for acoustic power considerations

Karl Grosh, Yuan Lin, Emilio Nelli Silva, Noboru Kikuchi

Proceedings Volume 3323, (1998) https://doi.org/10.1117/12.316313

KEYWORDS: Acoustics, Transducers, Chemical elements, Optimization (mathematics), Finite element methods, Ultrasonics, Ultrasonography, Ferroelectric materials, Matrices, Absorption

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