Frequency Response Dynamics
Mostrando 13-24 de 64 artigos, teses e dissertações.
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13. Representação da população idosa na luta por seus direitos no Brasil: o caso dos conselhos estaduais do idoso / Representação da população idosa na luta por seus direitos no Brasil: o caso dos conselhos estaduais do idoso
This work proposes and discusses the point profile of the Councils of State Elder representation with respect to non-governmental organizations representing the elderly population. Initially, it was discussed what is the democratic state of law and the construction and influence of social movements in our country. Was conducted bibliographic and documentary
Publicado em: 2009
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14. Influência da insulina exógena em diferentes doses sobre os parâmetros reprodutivos de cabras nulíparas da raça Anglo-nubiana. / Influence of exogenous insulin in different doses on the reproductive parameters of nulliparous goats of Anglo-nubian.
Thirty-nine nulliparous and cyclic Anglo-nubian goats were synchronized using 60 mg MPA (Progespon, Syntex, Argentina) vaginal sponge for 10 days associated with an luteolytic treatment 50 μg cloprostenol, 48 h before sponge removal (SR). Goats were allocated in three groups: Insulin I (n=13), Insulin II (n=13) and Control (n=13). In Insulin I and II gr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/07/2008
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15. MODELAGEM SÍSMICA EM ARENITOS: EFEITO DA DISPERSÃO DA VELOCIDADE E DO TIPO DE FLUIDO / SANDSTONE SEISMIC MODELING: EFFECTS OF VELOCITY DISPERSION AND FLUID TYPE
The evaluation of reservoir dynamics during production through time-lapse interpretation has reached a substantial importance in the petroleum industry, mainly in sandstones. This evaluation presents many challenges, mainly concerned to unmask the overlapping of different effects in seismic data due to reservoir changes. Several factors affect seismic proper
Publicado em: 2008
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16. Contribuição ao estudo dos absorvedores dinâmicos de vibrações não-lineares / A contribution to the study of Nonlinear Vibration Absorbers
In their simplest form, dynamic vibration absorbers (DVAs) are essentially devices of lumped parameters of mass-stiffness-damping that once connected in a given primary structure are capable of absorbing the vibratory energy at the connecting point, providing a reduction of the vibration level. These devices can be used in various configurations and find a n
Publicado em: 2008
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17. CONTROLE POR APRENDIZADO DE SISTEMAS SERVO: HIDRÁULICOS DE ALTA FREQÜÊNCIA / LEARNING CONTROL OF HIGH FREQUENCY SERVO: HYDRAULIC SYSTEMS
Hydraulic systems are used where relatively high forces and torques are required, or when high response speeds are necessary. They are used in industrial systems, robotics, movement simulators, automated plants, ore exploration, presses, and especially in fatigue testing systems. Fatigue tests are usually performed on servo-hydraulic systems, in order to pre
Publicado em: 2008
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18. Propriedades de equilÃbrio e de transporte da matÃria de vÃrtices em nanoestruturas supercondutoras
In the present thesis, we study theoretically the equilibrium properties and dynamics of the vortex matter in two classes of nanostructured superconductors: (i) mesoscopic samples, with dimensions comparable with the penetration depth; and (ii) films with periodic array of artificial traps. In both cases, the vortex lattice symmetry is strongly dependent on
Publicado em: 2007
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19. Contribuição ao estudo de aerogeradores de velocidade e passo variáveis com gerador duplamente alimentado e sistema de controle difuso / Contribution to the study of fuzzy control applied to variable-speed variable-pitch wind generators with double-fed induction generator
The efficient capture of aeolic-energy occurs by means of three blades turbines with adjustable pitch-angle and angular-speed. The pitch-angle adjustment is utilized to limit the aeolic-energy capture when occur very strong winds and, the angular speed adjustment is utilized to maximize the capture of kinetic energy of weak winds. In this mode of operation t
Publicado em: 2007
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20. Population ecology of three timber species in Eastern Amazon : implications for management / Ecologia populacional de tres especies madeireiras na Amazonia oriental : implicações para o manejo
Despite the current and increasing importance of logging in natural forests of the Brazilian Amazon, the population ecology of commercial species is largely unknown. The objective of this study was to contribute to the understanding of the population ecology and the effects of conventional (CL) and reduced impact logging (RIL) on the population dynamics of L
Publicado em: 2007
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21. Morphophysiological characteristics and herbage accumulation in mombaça grass subjected to defoliation regimes / Características morfofisiológicas e acúmulo de forragem em capim-mombaça submetido a regimes de desfolhação
Grazing systems that take into account the rhythm of regrowth of forage plants after defoliations can optimise herbage accumulation and ensure the control of sward structure. In these context, the objective was to evaluate patterns of response of Panicum maximum cv. Mombaça to defoliation in two experiments using measurements of sward morphogenetic and stru
Publicado em: 2006
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22. Application of time-delay neural and recurrent neural networks for the identification of a hingeless helicopter blade flapping and torsion motions
System identification consists of the development of techniques for model estimation from experimental data, demanding no previous knowledge of the process. Aeroelastic models are directly influence of the benefits of identification techniques, basically because of the difficulties related to the modelling of the coupled aero- and structural dynamics. In thi
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-06
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23. Analysis of Regular and Irregular Dynamics of a Non Ideal Gear Rattling Problem
This paper presents a study on the dynamics of the rattling problem in gearboxes under non-ideal excitation. The subject has being analyzed by a number of authors such as Karagiannis and Pfeiffer (1991), for the ideal excitation case. An interesting model of the same problem by Moon (1992) has been recently used by Souza and Caldas (1999) to detect chaotic b
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2002-05
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24. Identificação modal de uma estrutura aeronáutica via algoritmo de realização de sistemas / Modal identification of an aeronautical structure via the eigensystem realization algorithm
The determination of the dynamic characteristics of aircraft structures has become an extremely important issue in the aerospace industry, primarily due to the continuous demand for lighter and consequently more flexible structures. In this context, most aerospace structural system must be subjected to some form of modal verification prior to flight in order
Publicado em: 2002