Encontrados 10 documentos, a visualizar página 1 de 1
High accuracy navigation in unknown environment using adaptive control
Ribeiro, António Fernando; Moutinho, Ivo; Pereira, Nino; Oliveira, Fernando; Fernandes, José; Peixoto, Nuno; Salgado, AnteroAiming to reduce cycle time and improving the accuracy on tracking, a modified adaptive control was developed, which adapts autonomously to changing dynamic parameters. The platform used is based on a robot with a vision based sensory system. Goal and obstacles angles are calculated relatively to robot orientation from image processing software. Autonomous robots are programmed to navigate in unknown and unstru...
Mobile robot construction for edutainment application
Ribeiro, António Fernando; Moutinho, Ivo; Silva, Pedro; Braga, Paulo; Pereira, NinoAs time goes on, there are more and more robotics applications. The limit is almost the imagination of each person. A great deal of industrial work can yet be done by robots and new ideas are blossoming. The entertainment industry is arriving and there are already many ideas as well as real robots on the field. It is important to point out that the entertainment applications not just entertain people as it also...
Cooperative Behaviour of specific tasks in multi-agent systems and robot contro...
Ribeiro, António Fernando; Moutinho, Ivo; Pereira, Nino; Oliveira, Fernando; Fernandes, José; Peixoto, Nuno; Salgado, AnteroIn order to foster research and development in a multi-agent robotic environment three fundamental improvements on the robots need to be carried out: a) a very reliable and robot control which works at high speeds and a dynamic approach is described in this work; b) Cooperative behaviour is very important since without it there is no ball pass, and that is becoming more and more necessary; c) Upwards kick, sinc...
Influence of nitrogen content on the structural, mechanical and electrical prop...
Vaz, F.; Ferreira, J. A.; Ribeiro, E.; Rebouta, L.; Lanceros-Méndez, S.; Mendes, J.; Alves, E.; Goudeau, Ph.; Rivière, J. P.; Ribeiro, António FernandoThis paper reports on the preparation of TiNx thin films by d.c. reactive magnetron sputtering. The coating thickness ranged from 1.7 to 4.2 Am and the nitrogen content varied between 0 and 55 at.%. X-Ray diffraction showed the development of the hexagonal a-Ti phase, with strong [002] orientation for low nitrogen contents, where the N atoms fit into octahedral sites in the Ti lattice as the amount of nitrogen ...
Vision, kinematics and game strategy in multi-robot systems like MSL RoboCup
Ribeiro, António Fernando; Moutinho, Ivo; Silva, Pedro; Fraga, Carlos; Pereira, NinoIn Multi-Robot systems like the RoboCup football challenge, there are a small number of key issues which are of extreme relevance for the successfulness of the final application. In MSL RoboCup these main issues are three: a) The vision system, which has to be as reliable and fast as possible in order to perceive the necessary entities to carry out the game actions; b) Correct kinematics of the robot, that make...
Optimization of fast moving robots and implementation of I2C protocol to contro...
Ribeiro, António Fernando; Silva, Pedro; Moutinho, Ivo; Silva, Victor; Pereira, NinoThis paper briefly describes the main changes in the robots from Minho Team since the last RoboCup. Work has been carried out on the robots in order to constantly improve their capabilities, based on the experiences from previous participations. The main topics to deal in this paper are related with the I2C new communications protocol recently implemented in the robots, a description of the whole electronics sy...
Controlling omni-directional Wheels of a MSL RoboCup autonomous mobile robot
Ribeiro, António Fernando; Moutinho, Ivo; Silva, Pedro; Fraga, Carlos; Pereira, NinoAutonomous Mobile Locomotion is of extreme importance in RoboCup robots. Even though in 2050 the robotic team will very likely use legs rather than wheels, at the moment all teams on middle size league use wheels to overcome other problems first. Most teams are using two driving wheels (with one or two cast wheels), four driving wheels and even three driving wheels. The Minho team has been using two driving whe...
Three omni-directional wheels control on a mobile robot
Ribeiro, António Fernando; Moutinho, Ivo; Silva, Pedro; Fraga, Carlos; Pereira, NinoTraditional two wheels differential drive normally used on mobile robots have manoeuvrability limitations and take time to sort out. Most teams use two driving wheels (with one or two cast wheels), four driving wheels and even three driving wheels. A three wheel drive with omni-directional wheel has been tried with success, and was implemented on fast moving autonomous mobile robots. This paper deals with the m...
New improvements of MINHO team for RoboCup Middle Size League in 2003
Ribeiro, António Fernando; Braga, Paulo; Monteiro, Jorge; Moutinho, Ivo; Silva, Pedro; Silva, VictorAlthough this research group has started a robotic football team in 1998, MINHO team has been participating in RoboCup only since 1999. The robots were completely developed by the undergraduate team members (mechanics, hardware and software), due to budget reasons, and every year new improvements had been made. The team came to a point where new improvements would mean complete changes in the robot design, hard...
New improvements of MINHO Team for RoboCup middle size league in 2003
Ribeiro, António Fernando; Braga, Paulo; Monteiro, Jorge; Moutinho, Ivo; Silva, Pedro; Silva, VictorAlthough this research group has started a robotic football team in 1998, MINHO team has been participating in RoboCup only since 1999. The robots were completely developed by the undergraduate team members (mechanics, hardware and software), due to budget reasons, and every year new improvements had been made. The team came to a point where new improvements would mean complete changes in the robot design, hard...
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