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SciELO - Scientific Electronic Library Online (52.375 recursos)
SciELO (Scientific Electronic Library Online) is an electronic library covering a selected collection of Brazilian scientific journals. The objective of the site is to implement an electronic virtual library, providing full access to a collection of serial titles, a collection of issues from individual serial titles, as well as to the full text of articles. The project envisages the development of a common methodology for the preparation, storage, dissemination and evaluation of scientific literature in electronic format.

Mostrando recursos 1 - 20 de 165

1. Dynamic optimization for the trajectory planning of robot manipulators in the presence of obstacles - Saramago,Sezimária F. P.; Steffen Júnior,Valder
This paper presents an approach to the solution of moving a robot manipulator with minimum cost along a specified geometric path in the presence of obstacles.

2. Modeling, optimizing and simulating robot calibration with accuracy improvement - Motta,José Maurício S. T.; Mcmaster,R. S.
This work describes techniques for modeling, optimizing and simulating calibration processes of robots using off-line programming.

3. Kinematic analysis and modelling of biped locomotion systems - Silva,Filipe Miguel Teixeira Pereira da; Machado,José Antônio Tenreiro
This paper presents the kinematic study of robotic biped locomotion systems.

4. Application of a Pid+fuzzy controller on the motion control system in machine tools - Lacerda,H. B.; Belo,E. M.
This work deals with an hybrid PID+fuzzy logic controller applied to control the machine tool biaxial table motions.

5. Linear-quadratic optimal control of descriptor systems - Müller,Peter C.
In recent years the analysis and synthesis of (mechanical) control systems in descriptor form has been established.

6. Formulação probabilística para análise de tabuleiros de pontes rodoviárias com irregularidades superficiais - Silva,José Guilherme Santos da; Roehl,João Luís Pascal
Apresenta-se uma metodologia de análise com o objetivo de avaliarem-se os efeitos de irregularidades superficiais no tabuleiro sobre o comportamento de pontes rodoviárias submetidas à passagem de veículos.

7. Geometric nonlinear dynamic analysis of plates and shells using eight-node hexahedral finite elements with reduced integration - Azevedo,Ricardo Lessa; Awruch,Armando Miguel
The main features of the present formulation are: (a) the element matrices are obtained using reduced integrations with hourglass control; (b) an explicit Taylor-Galerkin scheme is used to carry out the dynamic analysis, solving the corresponding equations of motion in terms of velocity components; (c) the Truesdell stress rate tensor is used; (d) the vector processor facilities existing in modern supercomputers were used.

8. Modeling and control of multibody system with flexible appendages - Soares,Álvaro Manoel de Souza; Góes,Luiz Carlos Sandoval; Souza,Luiz Carlos Gadelha de
The objective of this work is to describe the design and the implementation of an experiment to study the dynamics and the active control of a slewing multi-link flexible structure.

9. Curving simulation and stability of a creep-controlled wheelset for high speed rail-vehicles - Meisinger,Reinhold
Higher travel speeds of rail vehicles will be possible by developing sophisticated top performance bogies having creep-controlled wheelsets.

10. Vibration analysis for Bearing outer race condition diagnostics - Shiroishi,J.; Y. Li,S. Liang; Danyluk,S.; Kurfess,T.
Specifically, the utility of a new signal processing scheme combining the High Frequency Resonance Technique (HFRT) and Adaptive Line Enhancer (ALE) is investigated.

11. Investigação para detecção automática de falhas têxteis - Proença,Claudia Belmiro; Conci,Aura; Segenreich,Solly A.
Este trabalho apresenta uma aplicação de Dimensão Fractal (DF) e técnicas de segmentação de imagens na inspeção industrial automática.

12. Critical aspects on the behavior of material from the mechanical tool-workpiece interaction in single point diamond turning - Jasinevicius,Renato Goulart; Duduch,Jaime Gilberto; Porto,Arthur José Vieira; Purquério,Benedito Morais
Some material aspects such as grain size, purity and anisotropy exert an important influence on surface quality, especially in single point diamond turning.

13. BEM/FEM non-linear model applied to transient analysis with viscous damping - Coda,Humberto Breves; Venturini,Wilson Sérgio
In this article a two-dimensional transient boundary element formulation based on the mass matrix approach is discussed.

14. Thermal radiation in combustion systems - Pessoa-Filho,José Bezerra
A numerical procedure for solving the nongray radiative transfer equation (RTE) in two-dimensional cylindrical participating media is presented.

15. Escoamento turbulento na saída de um duto curvo de seção retangular divergente: estudo experimental - Indrusiak,Maria Luiza Sperb; Möller,Sergio Viçosa
Neste trabalho é apresentado o estudo experimental do escoamento turbulento em um duto curvo simulando parte de uma caldeira de uma usina termoelétrica.

16. On the development of an unstructured grid solver for inert and reactive high speed flow simulations - Silva,Luis Fernando Figueira da; Azevedo,João Luiz F.; Korzenowsk,Heidi
The method is implemented in a cell centered, finite volume context for unstructured triangular grids.

17. Experimental analysis of the flow between stay and guide vanes of a pump-turbine in pumping mode - Mesquita,André L. Amarante; Ciocan,G. D.
An experimental study was conducted in a pump-turbine model in pumping mode, in order to characterize the flow field structure in the region between stay and guide vanes, using mainly the laser-Doppler anemometry in a two-color and back-scattered light-based system.

18. Model for subchannel friction factors and flow redistribution in wire-wrapped rod bundles - Carajilescov,Pedro; Fernandez y Fernandez,Elói
The fuel element of LMFBR consists of a bundle of rods wrapped with an helical wire as spacer, surrounded by an hexagonal duct.

19. Pressure drop coefficients for elliptic and circular sections in one, two and three-row arrangements of plate fin and tube heat exchangers - Bordalo,Sérgio Nascimento; Saboya,Francisco Eduardo Mourão
The experiments permitted to correlate the dimensionless loss coefficient with the flow Reynolds number in the rectangular channel formed by the plate fins.

20. A high frequency electronic transducer for multiphase flow measurements - Belo,Francisco Antônio; Moura,Luiz Felipe Mendes de
Its high sensitivity, good signal to noise ratio and accuracy are achieved through an electrical impedance sensor with a special guard technique.

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