Jacobian Analysis
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Direct Numerical Simulation of a Compressible Flow and Matrix-Free Analysis of its Instabilities over an Open Cavity
ABSTRACT: This study takes a Jacobian-free approach based on the Arnoldi iteration to present a method to perform hydrodynamic instability analysis based on Direct Numerical Simulations. The method employs high order spatial and temporal discretizations for the flow simulation and has very low requirements of computational time and memory, compared to conven
J. Aerosp. Technol. Manag.. Publicado em: 19/07/2018
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2. Kinematic Analysis of the Deployable Truss Structures for Space Applications
Abstract: Deployable structure technology has been used in aerospace and civil engineering structures very popularly. This paper reported on a recent development of numerical approaches for the kinematic analysis of the deployable truss structures. The dynamic equations of the constrained system and the computational procedures were summarized. The driving f
J. Aerosp. Technol. Manag.. Publicado em: 2012-12
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3. Estimação de estado em sistemas elétricos de potência: composição de erros de medidas / State estimation in power systems: measurement error composition
Bretas et al. (2009) has proved, using geometric background, that the measurement error can be decomposed into two components the detectable and the undetectable component respectively. Bretas has also demonstrated that the current methodologies used for processing of gross errors (GE), consider only the detectable component of the error. Thus, depending on
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/08/2011
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4. Measurements quality and redundancy evaluation for power system state estimation / Avaliação da qualidade e redundância das medidas para estimação de estado em sistemas elétricos de potência
The operating center requires much information in order to control and supervise the power systems. In a secure power systems operation it is important that the state estimation process be reliable. For that purpose, in this work: i) a computer program to evaluate and increment the reliability of power system in terms of redundancy and measurements availabil
Publicado em: 2007
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5. Modelagem e otimização de um robô de arquitetura paralela para aplicações industriais. / Modeling and optimization of a parallel architecture robot for industrial applications.
This work is about the study of parallel architecture robots, focusing in modeling and optimization. No physical prototypes were built, although the virtual models can help those willing to do so. After searching for an application that could benefit from the use of a parallel robot, another search was made, this time for the right architecture type. After s
Publicado em: 2006
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6. Power system state estimation: computer program for analysis and updating of measurement set qualitative characteristics / Estimação de estado em sistemas elétricos de potência: programa para análise e atualização das características qualitativas de conjunto de medidas
To obtain a safe power system (PS) operation, becomes necessary a reliable state estimation (SE), since the real time control actions of a PS are based on the data obtained through the SE process. The first requirement for a successful SE process is the existence of a reliable measurement placement plan, that is, a measurement placement plan that guarantees
Publicado em: 2006
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7. Modelagem do robothron um manipulador de barras paralelas
The work approaches the modeling of the articulated robotic manipulator with six degrees of freedom, conceived for educational ends. Its presented the structure, the robotic anatomy and components, as systems of transmission, actuators and sensors used in manipulating robots. The arm and base structure of the Robothron manipulator are described. The forward
Publicado em: 2005
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8. Metodo de atualização multi-coluna inverso para sistemas não-lineares
In this work it is introduced new quasi-Newton methods for solving largescale nonlinear systems of equations. In these methods q (>1) columns of the approximation of the inverse Jacobian matrix are updated, in such a way that the q last secant equations are satisfied (when it is possible) at every iteration. The new methods obtained are called a q-Columns In
Publicado em: 2002
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9. Simulador composicional de reservatorios com formulação implicita em pressão e saturações e semi implicita em composições
This work presents an isothermal, two-dimensional, compositional reservo ir model implicit in pressure and saturations and partially explicit in compositions. Only the flow terms are treated explicitly in the compositional variables. In the single phase cells the primary variable gas saturation is substituted by one compositional variable which is then treat
Publicado em: 1991
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10. Simulação numerica de reservatorios utilizando um metodo de implicitude auto-adaptavel
This work presents the development and application of a reservoir simulation method, based on a variable ando auto-adaptive implicit formulation. The variable implicitness formulation is based on a general approach of reservoir simulation methods, already presented in the literature. In such approach a basic leveI of implicitness for alI methods is recognize
Publicado em: 1990