Damping Constant
Mostrando 13-24 de 34 artigos, teses e dissertações.
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13. Resonance characteristics of two-span continuous beam under moving high speed trains
The resonance characteristics of a two-span continuous beam traversed by moving high speed trains at a constant velocity is investigated, in which the continuous beam has uniform span length. Each span of the continuous beam is modeled as a Bernoulli-Euler beam and the moving trains are represented as a series of two degrees-of-freedom mass-springdamper syst
Latin American Journal of Solids and Structures. Publicado em: 2010
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14. Classical and quantum correlations under decoherence / Correlações clássicas e quânticas sob decoerência
Recently, in the context of discrete variables, the existence of quantum correlations that are more general than entanglement was identified. We may conjecture that these correlations are a very important resource in quantum information science and in some areas of physics. However, this fragile resource is quickly destroyed by the decoherence process. In th
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/08/2009
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15. Interação plasmon-fônon LO em superredes semicondutoras
This work presents a Raman investigation of the optical vibrations in highly doped In-GaAs/InP and GaAs/AlGaAs superlattices (SLs). The InGaAs/InP SLs grown with different periods were analyzed using polarized Raman techniques. No Raman selection rules were found in the long period InGaAs/InP SLs due to the structural defects in the bulk materials constituti
Publicado em: 2008
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16. Simulation software development for multibody systems / Desenvolvimento de uma ferramenta computacional para simulação de sistemas mecânicos multicorpos
The mathematical simulation is a very important tool to reduce production costs in new projects of agricultural machines. This work consists of a simulation software development for multibody systems (MBS), called FSSM (tool for simulation of mechanical systems), with appropriate functionalities for manufacturers of agricultural machines, using the AutoCAD g
Publicado em: 2008
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17. Measurement of the damping of liquid surface wave by diffraction method
A simple method for measuring the damping of the liquid surface wave (LSW) based on the diffraction method was proposed in this paper. In the experiment, the phenomenon was observed that the intensity distribution of the diffraction patterns from the LSW varies with the position of the incident spot. By theoretical analysis of the relationship between the in
Brazilian Journal of Physics. Publicado em: 2007-09
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18. Controle de vibrações em edifícios submetidos à ação de cargas dinâmicas utilizando amortecedor de massa sintonizando na forma de pêndulo / Vibration control of structures subjected to dynamic loads using tuned pendulum-shaped mass dampers
The ongoing progress of structural analyses and dimensioning, in addition to the continuous advancements in building techniques and material, has made it possible to build taller and more slender structures every day. These structures are also more vulnerable to excessive vibrations caused by dynamic loads like earthquakes, winds, waves, intense traffic, and
Publicado em: 2007
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19. EWMA CHART WITH ADAPTIVE SMOOTHING CONSTANT FOR STATISTICAL PROCESS CONTROL / GRÁFICO EWMA COM CONSTANTE DE AMORTECIMENTO ADAPTATIVA PARA CONTROLE ESTATÍSTICO DE PROCESSOS
This work proposes an EWMA process control chart for individual observations or subgroup averages, in which the smoothing constant varies between two values according to the most recent value of the EWMA statistic, in order to achieve faster detection of small to moderate shifts in the process mean, and without the operational complexities presented by other
Publicado em: 2006
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20. Biomechanics load transmission single implants according to prosthetic materials photoelastic and dinamic analysis / "Biomecânica da transmissão de cargas a implantes unitários em função dos materiais protéticos: análise fotoelástica e dinâmica"
Less rigid oclusal materials such as acrylic resins are often used in prosthesis over implants because they are supposed to diminish the loads transferred to the bone; however there is no scientific evidence to support this theory. The objective of this work was to compare by photoelastic and dynamic analysis the load transfer after oclusal loads over single
Publicado em: 2005
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21. Modelagem analítica do perfil de temperatura no solo. / Analytical soil-temperature model.
Soil temperature influences many physical, chemical and biological processes that occur in soil. The exponential-sinusoidal one-dimensional analytical model reasonably describes soil temperature, T (oC), as a function of time, t (s), and depth, z (m), 0 ≤ z <∞. Surface temperature may be represented by the sum of two sinusoids, one related to ann
Publicado em: 2004
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22. Modelagem e simulação de um girômetro sintonizado dinamicamente em um CAD eletrônico / Modeling and simulation of dynamically tuned girometer using an eletronics CAD.
The motivation of this work is the simulation of the Dry Tuned Gyroscope in the environment of an Electronics CAD. The emphasis is on the development of the loop electronics with the greatest fidelity as possible. Initially a study of the equations of motion of the sensor is made. The torquer and the pick-offs arealso modeled. The result is a transfer functi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 200210
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23. In-situ determination of indium segregation in InGaAs/GaAs quantum wells grown by molecular beam epitaxy
The surface segregation of indium atoms during the growth of InGaAs/GaAs heterostructures has been investigated in situ by reflection high-energy electron diffraction (RHEED). We pointed out that strong damping of the RHEED oscillations during the deposition of InGaAs on GaAs was related to the segregation strength of indium atoms in the InGaAs layer. A simp
Brazilian Journal of Physics. Publicado em: 2002-06
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24. Soluções transientes de problemas visco-elastodinamicos em meios ilimitados atraves da transformada de Fourier rapida - FFT
This dissertation describes a methodology based on the Fast Fourier Transfonn - FFT to synthesize transient Green and Influence functions for unbounded viscoelastic domains. The FFT algorithm is applied to Green or Influence functions that has been previously obtained in the frequency domain. The techniques used to treat the functions in the frequency domain
Publicado em: 2002