Damping Constant
Mostrando 1-12 de 34 artigos, teses e dissertações.
-
1. Hybrid composites reinforced with short sisal fibres and micro ceramic particles
ABSTRACT Biocomposites reinforced with natural fibres have been extensively investigated as a promising replacing material for synthetic ones, such as the glass fibre reinforced composites. The length of natural fibres depends not only on the plant species, but also on the extraction processing. The heterogeneity of natural fibres, in terms of length, can be
Matéria (Rio J.). Publicado em: 20/07/2017
-
2. A Modified FEM for Transverse and Lateral Vibration Analysis of Thin Beams Under a Mass Moving with a Variable Acceleration
Abstract In this paper, a new modified finite element method that can be used in the analysis of transverse and lateral vibrations of the thin beams under a point mass moving with a variable acceleration and constant jerk is presented. Jerk is the change in acceleration over time. In this method, the classical finite element of the beam is modified by the in
Lat. Am. j. solids struct.. Publicado em: 2017-03
-
3. Time-Domain Three Dimensional BE-FE Method for Transient Response of Floating Structures Under Unsteady Loads
Abstract This paper presents a direct time-domain three dimensional (3D) numerical procedure to simulate the transient response of very large floating structures (VLFS) subjected to unsteady external loads as well as moving mass. The proposed procedure employs the Boundary Element and Finite Element methods (FEM-BEM). The floating structure and the surroundi
Lat. Am. j. solids struct.. Publicado em: 2016-07
-
4. Comparison of In-Flight Measured and Computed Aeroelastic Damping: Modal Identification Procedures and Modeling Approaches
ABSTRACT The Operational Modal Analysis technique is a methodology very often applied for the identification of dynamic systems when the input signal is unknown. The applied methodology is based on a technique to estimate the Frequency Response Functions and extract the modal parameters using only the structural dynamic response data, without assuming the kn
J. Aerosp. Technol. Manag.. Publicado em: 2016-06
-
5. Parametric resonance in concrete beam-columns
A dynamic instability, called parametric resonance, is exhibited by undampedelastic beam-columns when under the action of pulsating axial force. The scope of the existing theory of parametric resonance is restricted to physically linear beam-columns undergoing finite lateral displacements. In this Paper, the dynamic behaviour of physically nonlinear elastic
Lat. Am. j. solids struct.. Publicado em: 2014-11
-
6. Demographic fitness of Belminus ferroae (Hemiptera: Triatominae) on three different hosts under laboratory conditions
Triatominae are widely recognised for their role as vectors of Trypanosoma cruzi. One of the main biological characteristics of this subfamily is their obligate haematophagous condition. However, previous studies on Belminus herreri and Belminus ferroae suggested that cockroaches are their principal hosts in domiciles. Due to this peculiar behaviour, the aim
Mem. Inst. Oswaldo Cruz. Publicado em: 2013-11
-
7. Deflection profile analysis of beams on two-parameter elastic subgrade
A procedure involving spectral Galerkin and integral transformation methods has been developed and applied to treat the problem of the dynamic deflections of beam structure resting on bi-parametric elastic subgrade and subjected to travelling loads. The case of the response to moving constant loads of this slender member is first investigated and a closed fo
Lat. Am. j. solids struct.. Publicado em: 2013-03
-
8. A procedure for the parametric identification of viscoelastic dampers accounting for preload
Passive vibration isolators are usually made of viscoelastic materials. These materials have non-linear characteristics that change their dynamical properties with temperature, frequency and strain level. The vibration isolator's mathematical modeling and optimal design require the prior knowledge of the stiffness and damping of the applied viscoelastic mate
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-06
-
9. A Procedure for the Parametric Identification of Viscoelastic Dampers Accounting for Preload
Passive vibration isolators are usually made of viscoelastic materials. These materials have non-linear characteristics that change their dynamical properties with temperature, frequency and strain level. The vibration isolator’s mathematical modeling and optimal design requires the prior knowledge of the stiffness and damping of the applied viscoelastic m
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-09
-
10. Model uncertainties of flexible structures vibrations induced by internal flows
In many situations analysts use incomplete models to design a system, or to make decisions. These models are incomplete due to unmodeled phenomena, which means that some features are not included in the model (either because it was not previously thought about or because it would be too expensive to include). These uncertainties related to the model are diff
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-09
-
11. Influência da nanoargila no envelhecimento higrotérmico de compósitos de polipropileno / PP maleado / fibra de vidro / Influence of nanoclay on the hygrothermal ageing of polypropylene / maleated pp / glass fiber composites abstract
In short glass fiber (GF) reinforced polypropylene (PP) composites, despite of the chemically inert and non-polar nature of the matrix, the fiber-matrix interfacial integrity may be compromised in a hygrothermal active environment by the addition of maleic anhydride (MAH) molecules of the interfacial compatibilizer (PP-g-MAH). The use of organophilic nanocla
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/05/2010
-
12. Comparison between numerical and experimental results on the dynamics of floating system coupled with risers. / Confrontação numérico-experimental da dinâmica de sistema flutuante, considerando seu acoplamento com linhas de produção.
This research aims to present analysis and comparisons, intended to make part of the constant improvement of the oil platform analysis software, called Numerical Offshore Tank (Tanque de Provas Numérico - TPN). For this purpose, small-scale model tests were performed, and the results compared with the numerical model in TPN. The standard unit used in these
Publicado em: 2010