A5042735534- Acoustic Wave Phenomena Research
- Ultrasonics and Acoustic Wave Propagation
- Railway Engineering and Dynamics
- Innovative concrete reinforcement materials
- Music Technology and Sound Studies
- Innovations in Concrete and Construction Materials
- Hearing Loss and Rehabilitation
- Vibration and Dynamic Analysis
- Smart Materials for Construction
- Noise Effects and Management
- Metallurgy and Material Forming
- Microstructure and Mechanical Properties of Steels
- Concrete and Cement Materials Research
- Structural Behavior of Reinforced Concrete
- Metal Alloys Wear and Properties
- Academic Research in Diverse Fields
- Fluid Dynamics Simulations and Interactions
- Seismic Waves and Analysis
- Structural Engineering and Vibration Analysis
- Cellular and Composite Structures
- Acoustic Wave Resonator Technologies
- Elasticity and Wave Propagation
- Vibration Control and Rheological Fluids
- Electromagnetic Simulation and Numerical Methods
- Antenna Design and Analysis
Instituto Federal do Maranhão
2014-2025
Vale (Brazil)
2023-2025
National Council for Scientific and Technological Development
2025
Vale Technological Institute
2023-2025
Universidade Estadual de Campinas (UNICAMP)
2017-2023
Hospital de Clínicas da Unicamp
2015-2018
Abstract In this study, we develop an extended plane wave expansion method to determine the complex elastic band gaps for both in‐plane and out‐of‐plane vibrations in a viscoelastic phononic crystal (PnC) thin plate model under constant temperature field. The periodic structure of comprises unit cell (UC) consisting epoxy matrix circular steel inclusions. configuration, consider effects described by generalized Maxwell arising from matrix. Furthermore, incorporate thermal UC, accounting...
The extended plane wave expansion (EPWE) method is formulated in order to obtain the complex dispersion diagram of bulk waves 1-D viscoelastic phononic crystal solids considering standard linear solid model (SLSM). This new formulation important handle evanescent Bloch periodic structures for mechanical attenuation. effect can increase unit cell attenuation structures. In addition, relaxation time (up ωa/2πct=7) and decrease final state shear modulus (considering ωa/2πct≤1.9) enhance
A energia das vibrações geradas
IntroduçãoOs ruídos a baixas frequências estão no cotidiano do ser humano, sendo conhecidos por causar problemas à saúde e afetar qualidade de vida (Liu et al. 2020).Por isso, é fundamental entender tanto sua fonte como o meio propagação, além aplicar técnicas dispositivos que auxiliem controle desses problemas, vez, são gerados partir vibrações, porém, maioria dos dispositivos, para supressão ruídos, trabalham faixas alta média frequência, tornando as zonas baixa possuem comprimento onda...
Abstract The incorporation of expanded polystyrene (EPS) into concrete reduces its density, but also mechanical properties. Therefore, the with EPS is generally considered as a non-structural material. In this study, destructive and nondestructive techniques were used to analyze microstructural, mechanical, acoustic performances produced by particle packing method, replacing an increasing percentage (5 20%) coarse aggregate volume EPS. properties decreased, not enough for be non-structural;...
We study the band structure of elastic waves propagating in a nano-piezoelectric phononic crystal consisting polymeric matrix reinforced by BaTiO3 inclusions square, rectangular, triangular, honeycomb and Kagomé lattices. also investigate influence inclusion cross section geometry - circular, hollow square rotated with 45º angle rotation respect to x y axes. Plane wave expansion method is used solve governing equations motion piezoelectric solid based on classical elasticity theory, ignoring...
We investigate theoretically and experimentally the forced response of flexural waves propagating in a 1D phononic crystal (PC) Euler-Bernoulli beam, composed by steel polyethylene, its band structure. The finite element, spectral wave conventional improved plane expansion methods are applied. demonstrate that vibration attenuation unit cell can be choosing correctly polyethylene quantities we suggest best percentages these materials, considering different lengths. An experiment with PC beam...
This paper analyzes the compressive strength of Portland cement concrete in response to incorporation 5%, 10% and 20% flat glass powder place sand, at w/c (water/cement) ratios 0.50, 0.55 0.58. A statistical analysis variance (ANOVA) was performed after 7, 14 28 days curing. The test results indicate that containing a ratio 0.50 can be used for structural applications, regardless waste content, as with glass. We suggest use sand abovementioned percentages is feasible production an...
We investigate the band structure of elastic waves propagating in carbon nanostructure phononic crystals with square, rectangular, triangular, honeycomb and Kagomé lattices. also study influence cross section geometry - circular, hollow square rotated a 45° angle rotation respect to x y axes. Plane wave expansion method is used solve governing equations motion isotropic solid based on classical elasticity theory, ignoring nanoscopic size effects, considering two-dimensional periodicity...
We investigated the band structure of flexural waves propagating in a metaconcrete thin plate, consisting concrete matrix reinforced by steel inclusions coated rubber square and triangular lattices. considered classical Kirchhoff-Love plate theory. also studied influence inclusion geometry - circular, rotated with 45° angle rotation respect to x, y axes. Improved plane wave expansion method was used solve equation considering propagation xy plane. Flat bands locally resonant gaps were...
The objectives of this study were to produce ZrO 2 -based nanoparticles doped with silver, using the polymeric precursor method (Pechini), and verify their bactericidal activity against Escherichia coli Staphylococcus aureus . Zirconium silver oxides chosen due activity. characterized by X-ray diffraction field emission gun-scanning electron microscopy. support for was a porous surface used in gravity filters. not effective bacterium sample subjected UV light 45 min, since it did eliminate...