Attitude Control
Mostrando 13-24 de 160 artigos, teses e dissertações.
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13. Satellite Inertia Parameters Estimation Based on Extended Kalman Filter
ABSTRACT: The moment of inertia parameters play a critical role in assuring the spacecraft mission throughout its lifetime. However, determination of the moment of inertia is a key challenge in operating satellites. During satellite mission, those parameters can change in orbit for many reasons such as sloshing, fuel consumption, etc. Therefore, the inertia
J. Aerosp. Technol. Manag.. Publicado em: 28/03/2019
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14. Research of the Photoelectric Tracking and Pointing Platform Based on the Servo Control System
ABSTRACT: To improve the speed and accuracy of the photoelectric tracking and pointing platform stable tracking, we took the three-axis photoelectric tracking platform, of which the coupling among the rings is ignored, as the research object. Considering the effects of various disturbances, the stable tracking double closed-loop servo control system was buil
J. Aerosp. Technol. Manag.. Publicado em: 18/03/2019
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15. Cut-Point for Satisfactory Adherence of the Dietary Sodium Restriction Questionnaire for Patients with Heart Failure
Resumo Fundamento: A baixa ou a não adesão à redução de sódio na dieta foi identificada como um dos principais fatores causais da insuficiência cardíaca (IC). O Questionário de Restrição de Sódio na Dieta (QRSD) do inglês Dietary Sodium Restriction Questionnaire (DSRQ) identifica fatores que possam interferir na adesão a essa recomendação. N
Arq. Bras. Cardiol.. Publicado em: 2019-02
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16. Design of Attitude Control Servomechanisms with Fluid Ring and CMG for Rigid Satellite
ABSTRACT: Satellites cover a wide range of space missions as remote sensing. Accomplishment of the mission depends on satellite's stability maintenance and direction. The main task of the attitude control system is to provide stability to the satellite against external disturbances. Such perturbations are caused due to aerodynamic drag, solar radiation and m
J. Aerosp. Technol. Manag.. Publicado em: 08/11/2018
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17. The ITASAT CubeSat Development and Design
ABSTRACT: Because they are inexpensive platforms for satellites, CubeSats have become a low-cost way for universities and even developing countries to have access to space technology. This paper presents the ITASAT design, particularly the Attitude Determination and Control Subsystem, the Onboard Software, and the Assembly, Integration and Testing program. T
J. Aerosp. Technol. Manag.. Publicado em: 2017-06
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18. Robust Optimal Adaptive Trajectory Tracking Control of Quadrotor Helicopter
Abstract This paper focuses on robust optimal adaptive control strategy to deal with tracking problem of a quadrotor unmanned aerial vehicle (UAV) in presence of parametric uncertainties, actuator amplitude constraints, and unknown time-varying external disturbances. First, Lyapunov-based indirect adaptive controller optimized by particle swarm optimization
Lat. Am. j. solids struct.. Publicado em: 2017-06
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19. Relationship between perceived parenting style with anxiety levels and loneliness in visually impaired children and adolescents
Abstract Background Visual impairment is a risk factor for psychiatric disorders in the affected children and adolescents, but there are only a limited number of studies concerning the mental health characteristics of visually impaired children and adolescents. Objective The aim of this study was to determine levels of loneliness and anxiety in visually
Arch. Clin. Psychiatry (São Paulo). Publicado em: 2016-10
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20. The Control of Asymmetric Rolling Missiles Based on Improved Trajectory Linearization Control Method
ABSTRACT According to motion characteristic of an asymmetric rolling missile with damage fin, a three-channel controlled model is established. The controller which is used to realize non-linear tracking and decoupling control of the roll and angle motion is introduced based on an improved trajectory linearization control method. The improved method is compos
J. Aerosp. Technol. Manag.. Publicado em: 2016-09
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21. Unscented Kalman Filter for Determination of Spacecraft Attitude Using Different Attitude Parameterizations and Real Data
ABSTRACT The non-linear estimators are certainly the most important algorithms applied to real problems, especially those involving the attitude estimation of spacecraft. The purpose of this paper was to use real data of sensors to analyze the behavior of Unscented Kalman Filter (UKF) in attitude estimation problems when it is represented in different ways a
J. Aerosp. Technol. Manag.. Publicado em: 2016-03
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22. A Novel Integrated Guidance and Control System Design in Formation Flight
ABSTRACT: Bird's formation flight is one of the best types of cooperation in nature. The bird's flight was the motivation of humans for flying. After one century of flight development, bird's formation flight was the motivation of humans for aircraft's formation flight. The closeness of aircrafts in formation flight and the effect of disturbances such as vor
J. Aerosp. Technol. Manag.. Publicado em: 2015-12
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23. Interaction Between Motions of Robotic Manipulator arms and the Non-Fixed base in On-Orbit Operations
ABSTRACT: The objective of this paper is to study the problem of the robotic manipulator operating on a non-fixed base by considering two dynamics scenarios. One in which the base is free to react in response to the robotic manipulator motion and the other in which the robotic manipulator moves its links in such a way to compensate the reaction forces on the
J. Aerosp. Technol. Manag.. Publicado em: 2015-12
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24. Experimental Investigation of a Monopropellant Thruster Using Nitrous Oxide
ABSTRACT: Nitrous oxide is a monopropellant with potential for use in propulsion systems for orbit correction, positioning and attitude control of satellites. This paper presents experimental results with a 2N thruster prototype employing nitrous oxide gas decomposed by a rhodium oxide catalyst supported on alumina. Initially, the thruster design, the test b
J. Aerosp. Technol. Manag.. Publicado em: 2014-12