This paper presents a study of special trajectories attainment for mobile robots based on the dynamical features chaotic systems. method construction is envisaged missions terrain exploration, with specific purpose search or patrol, where fast scanning robot workspace required. We propose imparting motion behavior to by means planner goal positions sequence an area-preserving map. As consequence, seem highly opportunistic and unpredictable external observers, trajectories's characteristics...

This work deals with the analysis and design of a reaction thruster attitude control for Brazilian Multimission platform satellite. The three‐axis systems are activated in pulse mode. Consequently, modulation torque command is compelling order to avoid high nonlinear action. considers Pulse‐Width Pulse‐Frequency (PWPF) modulator which composed Schmidt trigger, first‐order filter, feedback loop. PWPF holds several advantages over classical bang‐bang controllers such as close linear operation,...

Noncooperative target spacecrafts are those assets in orbit that cannot convey any information about their states (position, attitude, and velocities) or facilitate rendezvous docking/berthing (RVD/B) process. Designing a guidance, navigation, control (GNC) module for the chaser RVD/B mission with noncooperative should be inevitably solved on-orbit servicing technologies. The proximity operations guidance achieving problems addressed this paper. out-of-plane maneuvers of explored distinct...

Considering that a Wind Energy Conversion System is non-linear system highly dependent of stochastic variable and subjected to several kinds inputs, including periodical disturbance due operational phenomena, it represents an interesting problem in viewpoint control theory. In this paper, realized comparison between H <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> xmlns:xlink="http://www.w3.org/1999/xlink">∞</inf> controllers....

This paper presents a multivariable controller for wind energy conversion system (WECS). The pitch angle and electric load are regulated to control the Wind Turbine (WT) speed, aiming reduce mechanical stress improve efficiency. robust H/sub /spl infin// methodology is chosen design feedback controller, since WECS consists of non-linear stochastic system. Simulation results used analyze performance proposed control.

Design candidates obtained from optimization techniques may have meaningful information, which provides not only the best solution, but also a relationship between object functions and design variables.In particular, trade-off studies for optimum airfoil shape involving various objectives variables require effective analysis tool to take into account complexity this study, multiple-conflicting that need be simultaneously fulfilled, real-coded Adaptive Range Multi-Objective Genetic Algorithm...

Applications of PWM rectifiers are very promising, since they able to supply DC power while keeping a sinusoidal current with unity in the fundamental factor simultaneously. Another important application for is as static VAR compensators, where reactive compensate inductive loads connected on grid. In this paper, microprocessor-based regulator proposed voltage-fed input control both and direct voltage. The grid controlled through discrete-time feed-forward state feedback control, which...

The behaviour of dynamical systems can be reproduced from analogous electronic circuits, which allows the study many interesting phenomena associated with them using inexpensive and versatile components easily found on market. This paper proposes a methodology to develop didactic platforms for based circuits. Presented here are design implementation three circuits that mimic natural chaotic systems: forced Duffing system, Lorenz system Rössler system.

This paper deals with the problem of 3-axis attitude stabilization a satellite subjected to dynamics perturbations.The controller is based on Linear Quadratic Gaussian control theory (LQG).The main purpose work synthesize law characterized by simplicity implementation.The study considers specific case Brazilian PMM.The article presents system modelling, proposed control, and analysis simulation results.

This paper presents the project of a robotic device for propulsion in aquatic environment. The propulsor is biologically inspired system characterized by efficiency and flexibility locomotion environment changing: legs anuran amphibious. These animals are exceptionally adapted to water land. type requires specific features mechanisms that hardly provided traditional solutions based on standard electric motors. proposed approach ionomeric polymers-metal composites drives, constituting...

&lt;span style="font-family: T3Font_6; font-size: xx-small;"&gt;&lt;span xx-small;"&gt;&lt;em&gt; style="font-size: small;"&gt; &lt;/span&gt;&lt;/em&gt;&lt;p class="MsoNormal" style="margin: 0cm 0pt; text-align: justify;"&gt;&lt;em&gt;&lt;em style="mso-bidi-font-style: normal;"&gt;&lt;span 11pt; mso-bidi-font-size: 10.0pt; mso-ansi-language: EN-US;" lang="EN-US"&gt;Formation control of multiple mobile robots is relatively a new area robotics and increase the performance advantages systems....

In this paper we present a low cost fault-tolerant attitude determination system to scientific satellite using COTS devices. We related our experience in developing the system, where combine proven fault tolerance techniques protect whole composed only by from effects produced transient faults. detailed failure cases and detection, reconfiguration recovery schemes that assure condition. A testbed was used inject faults, evaluate capability of validate solution proposed.

Abstract This paper describes the experience of an introductory discipline to engineering curricula at Brazilian Federal University ABC (UFABC). The university offers a common basic curriculum that must be accomplished by every student and can followed professionalising courses. ‘Introduction Engineering’ presents basis career, methods thinking together with professional commitments regulations. objective is help students consciously choose their careers, minimising precocity problem in...

A methodology for granulometric image analysis based on modeling the spatial energy of frequencies, using Wavelet transform is presented in this article. brief review Transform tool presented, and proposed detailed. The results were obtained numerically experimentally simulated images. These show relevant correlation between coefficients size distribution analyzed objects.

satellite using a digital signal processor.The main motivation of this study is the attitude control system aim testing adequacy adopted control.The next steps had included an analysis discretization modulator.The validation tests used scheme co-simulation, where model was simulated in and required time to achieve given mission accuracy are determined, results provided as illustration.

This article deals with the problem of Earth's magnetic field sensors calibration in context low-cost nanosatellites' navigation systems.The attitude space vehicles can be determined from state estimation using information three-axis inertial and non-inertial sensors.This study considers a solid-state magnetometer.In vehicle itself, presence ferrous materials electronic devices creates disturbances, distorting measured field.The sensor precision enhanced through methods which calculate...

This work deals with the problem of design an autonomous redundant system for attitude determination nanosatellites. The consists a circuit board equipped three microcontrollers, magnetic field sensor in axes, and complementary commercial-of-the-shelf (COTS) components connectors to provide data signal exchange vehicle on-board computer. main goal this system, named SDATF (of acronym Portuguese Sistema de Determinação Atitude com Tolerância Falhas), is autonomously from information collected...