E. Cotrino B. Carlos

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1. Abstract This work describes a topology optimization framework to design the material distribution of a functionally graded rotating disk considering mechanical stress constraints. In the case of a rotating disk, under body forces, the problem of interest consists of maximizing the rotating inertia subjected to a global stress constraint. In FGMs, due to(More)
1. Abstract Piezoresistive materials, materials whose resistivity properties change when subjected to a mechanical stresses, currently have wide industry application for building MEMS, such as, pressure sensors, accelerometers, inclinometers, and load cells. A basic piezoresistive sensor consists of piezoresistive material bonded to a flexible structure,(More)
Functionally Graded Materials (FGMs) possess continuously graded properties with gradual change in microstructure. The concept of FGM is closely related to the topology optimization concept which essentially consists in a design method that seeks a continuum optimum material distribution in a design domain. This suggests that FGM structures can be designed(More)
  • Cícero Ribeiro De Lima, André Da Costa Teves, Emílio Carlos, Nelli Silva
  • 2014
Highly flexible structures (springs) can be found in many precise devices, such as small actuators of optical disc drive and mobile cameras. A good configuration design is crucial for correct operation of these devices. In this case, optimization techniques can be applied to design of these flexible structures, aiming to reduce development time and costs.(More)
Nanopositioning systems are fundamental in scanning probe microscopy and in microelectronics, where elements with nanometer dimensions are manipulated. These systems require positioning stages with nanoscale resolution for assembly, testing and characterization. It is recognized that piezoelectric actuators are ubiquitous tools in a wide variety of(More)
1. Abstract Piezoelectric mechanisms offer significant promise in a wide range of applications such as cell manipulation , microsurgery, nanotechnology processes, and many other fields. The piezoelectric mechanisms considered in this work essentially consist of a multi-flexible structure actuated by two or more piezoce-ramic devices that must generate(More)
1. Abstract In the structural design, usually only concentrated loads are considered. However, among mechanical structures, there are some in which the body forces have a major importance in its design. This is the case of rotational machines such as energy generator rotors, turbine runners and flywheels. Unfortunately, the optimal design of these(More)
Electrical Impedance Tomography (EIT) is a imaging method that estimates conductivity distribution inside a body (domain). In this method, images are obtained by applying a sequence of low intensity electrical currents, through electrodes positioned around the body. Applications of EIT can be often found in geophysics sciences, non-destructive testing and(More)
The Electrical Impedance Tomography (EIT) is a recent monitoring technique of biological tissues that allows us to obtain images of a transversal plane in any section of human body. The images are generated from voltage values measured around the plane section of human body. These voltages are obtained by applying an alternated sequence of low amplitude(More)
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