Dynamic Positioning Systems
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Study on patient dosimetry and image quality in digital mammography
Abstract Introduction Digital mammography present many advantages in comparison to conventional mammography, such as high dynamic range and the post-processing of acquired images. One problem is that protocols may not be optimized, resulting in higher absorbed doses to patients. The objective of this work is to evaluate image quality and to estimate mean gl
Res. Biomed. Eng.. Publicado em: 2017-06
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2. Design of a passive nonlinear observer and a backstepping controller for surface vessels. / Projeto de um observador passivo não-linear e de um controlador backstepping para navios de superfície.
Dynamic Positioning Systems (DPS) are control systems used to maintain the vessel on a desired position or pre-defined path exclusively by means of active thrusters. A DPS can be separated into a set of dedicated modules with designated tasks. The most significant modules are the position and heading measurement systems, the state estimator, the controller a
Publicado em: 2010
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3. Estimativa da atitude e posição e controle robusto de um helicóptero autônomo / Attitude and position estimation and robust control of an autonomous helicopter
Este trabalho aborda o estudo de um sistema de referência inercial de posição e atitude e um sistema de controle para um helicóptero autônomo utilizando, como base para formulação e testes, o modelo linearizado da aeronave Yamaha R-MAX. Um sistema de referência inercial (INS) e um sistema de referência de atitude e orientação (AHRS) são utilizado
Publicado em: 2010
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4. Controle por modos deslizantes aplicado a sistema de posicionamento dinâmico. / Sliding mode control applied to dynamic positioning systems.
This paper presents the application of the robust and nonlinear sliding mode control theory to the dynamic positioning systems for floating vessel, with experimental validation. The objective of the control system designed is to keep the vessel next a specific position (set-point) or follow a pre-defined trajectory (pathfollowing) through the action of prope
Publicado em: 2009
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5. Dynamic generation metodology of road travel patterns to vehicles intelligent monitoring in AVL systems. / Metodologia de geração dinâmica de padrões de viagens rodoviárias para monitoramentos inteligentes de veículos de carga em sistemas AVL.
This dissertation addresses the question of vehicle travel adherence in intelligent monitoring with Automatic Transportation Location (AVL) operating in a regional environment. A trip is considered as series of runs, corresponding to time in movement but excluding time spent on activities such as loading/unloading and others. Based on historic data collected
Publicado em: 2008
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6. Gestão estratégica de resíduos sólidos : utilização do balanced scorecard
The public sector services are sited in a very dynamic environment, forcing their administrators to have a good perceiving of the internal and external factors that determine the systems reality. Particularly for the solid waste management in Brazil, this universe is defined by political pressures and limitations, influences by populations consuming patterns
Publicado em: 2007
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7. Adaptive techniques applied to offshore dynamic positioning systems
Dynamic positioning systems (DPS) comprise the deployment of active propulsion to maintain the position and heading of a vessel. Several sensors are used to measure the actual position of the floating body, while a control algorithm is responsible for the calculation of forces to be delivered by each propeller, in order to counteract all environmental forces
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-09
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8. Controle dinâmico de robôs móveis com acionamento diferencial
This work addresses the dynamic control problem of two-wheeled differentially driven non-holonomic mobile robot. Strategies for robot positioning control and robot orientating control are presented. Such strategies just require information about the robot conguration (x, y and teta), which can be collected by an absolute positioning system. The strategies de
Publicado em: 2006
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9. Projeto e implementação do controle de posição de uma antena de radar meteorológico através de servomecanismos. / Design and implementation of a weather-radar antenna position control using servomechanisms.
A classical radar antenna is basically composed of a primary source mounted at the focal point of a parabolic reflector. The illumination rule is established so that the desired beam-shape is attained, as precisely as possible. The physical motion of the set guarantees the coverage of the desired volume of exploitation. The actual text studies the design and
Publicado em: 2006
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10. Análise e projeto de sistemas de controle para atuadores hidráulicos servo acionados : um estudo de caso
This work approaches the modeling problem of servo hydraulic position systems and analyzes the question of the project and application in this context of not conventional control systems. In such a way, an appropriate bench of tests is described with details, as much in functional terms as to the technology of its elements. This bench, is in PUCPR and here c
Publicado em: 2006
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11. Construção e avaliação de célula de fluxo para estudo da tensão interfacial dinâmica da interface fluxo líquido - sólido por despolarização da fluorescência
A simple low-cost flow cell was developed, built and optimized in order to observe dynamic interfacial tension of continuous flow systems. Distinct materials can be used in one of the cell walls in order to observe the intermolecular forces between the flowing liquid and the chemical constitution of the walls. The fluorescence depolarization was evaluated us
Química Nova. Publicado em: 2005-03
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12. Desenvolvimento de sistema de sensoriamento de posição e atuação para posicionamento dinâmico de modelos reduzidos em tanque de provas. / Development of both sensing and actuation infra-structure for the performance evaluation of Dynamic Positioning Systems for reduced scale model of ships in towing tanks or offshore tanks.
The main objective of this work is the development of both sensing and actuation infra-structure for the performance evaluation of Dynamic Positioning Systems for reduced scale model of ships in towing tanks or offshore tanks. It describes the conception, design, implementation and tests of a range and orientation sensor system, as well as the hardware of th
Publicado em: 2005