Now showing items 1-7 of 7
TIME-OPTIMAL GEOMAGNETIC ATTITUDE MANEUVERS OF AN AXISYMMETRICAL SPINNING SATELLITE
(Acta Astronautica, 1992-11-01) [Artigo]
A formulation used to determine the time-optimal geomagnetic attitude maneuvers subject to dynamic and geometric constraints is proposed in this paper. This was obtained by a direct search procedure based on a control ...
Modelling of fatigue crack growth following overloads
(International Journal of Fatigue, 1991-09-01) [Artigo]
In variable-amplitude loading there are interaction effects between the loading history and the crack propagation rate. The most important of these effects is the retardation in the crack propagation, which may raise the ...
Esforcos hidraulicos dinamicos em turbomaquinas
(Revista de Engenharia e Ciencias Aplicadas, 1994-12-01) [Artigo]
A measurement device has been developed to measure force and torque components acting on the impeller of a model pump-turbine, which uses crystal quartz load transducers installed on the rotating shaft. These kinds of load ...
Quantitative characterization of multi-phase materials by digital image processing
(Praktische Metallographie = Practical Metallography, 1998-09-01) [Artigo]
An automatic image processing and analysis technique has been developed for quantitative characterization of multi-phase materials. For the development of this technique is used the Khoros system that offers the basic ...
PERFORMANCE OF ARMA ALGORITHMS ON A TIME SERIES FROM A SIMPLE VIBRATING SYSTEM
(Structural Dynamics: Recent Advances - Proceedings of the 5th International Conference, Vols I and Ii, 1994-01-01) [Trabalho apresentado em evento]
Fatigue crack growth of Al 7475 T761 under constant and variable amplitude loading
(Advances In Fracture Research, Vols 1-6, 1997-01-01) [Trabalho apresentado em evento]
Experimental programs in constant and variable amplitude loading were performed to obtain a x N curves and to study retardation in fatigue crack growth due to overloads. The main aim of this research program was to analyse ...
COMPLEX OSCILLATORY BEHAVIOR IN A CRACKED BEAM UNDER SINUSOIDAL EXCITATION
(Journal of Sound and Vibration, 1995-09-21) [Carta]