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Publications

Publications by CRIIS

2010

IntellWheels MMI: A Flexible Interface for an Intelligent Wheelchair

Authors
Reis, LP; Braga, RAM; Sousa, M; Moreira, AP;

Publication
ROBOCUP 2009: ROBOT SOCCER WORLD CUP XIII

Abstract
With the rising concern about the needs of people with physical disabilities and with the aging of the population there is a major concern of creating electronic devices that may improve the life of the physically handicapped and elderly person. One of these new solutions passes through the adaptation of electric wheelchairs in order to give them environmental perception, more intelligent capabilities and more adequate Human - Machine Interaction. This paper focuses in the development of a user-friendly multimodal interface, which is integrated in the Intellwheels project. This simple multimodal human-robot interface developed allows the connection of several input modules, enabling the wheelchair control through flexible input sequences of distinct types of inputs (voice, facial expressions, head movements, keyboard and, joystick). The system created is capable of storing user defined associations, of input's sequences and corresponding output commands. The tests performed have proved the system efficiency and the capabilities of this multimodal interface.

2010

Flexible internal logistics based on AGV system's: A case study

Authors
Rocha, LF; Moreira, AP; Azevedo, A;

Publication
IFAC Proceedings Volumes (IFAC-PapersOnline)

Abstract
Automated Guided Vehicles (AGV) are self-driven vehicles used to transport material between workstations in the shop floor without the help of an operator, although they can also be applied in security and exploration. They are widely used in material handling systems and flexible manufacturing systems, where production orders are constantly changing. Today, and due to the constant development of technology, sophisticated machinery is increasingly available, thus enabling manufacturing firms to achieve significant process and setup time reductions. With this development, enterprises are encouraged to leave mass production approaches and start adopting small productions lot sizes, leading to constant changes in the production operation's sequences as well as changes in the factory layout. As a consequence of the development of technology, products started to spend a big percentage of time in the queue line or being transported from one workstation/storage to another. With the introduction of AGVs production process flexibility may increase, which, in many productions processes, is still below the expectations due to the used transportation system (ex: conveyors). At the same time, with the AGVs it is possible, to decrease transportations times and costs. In this article, we will study by means of simulation, the impact of the use of an AGV transportation based system in an industrial coating application. The AGV will be responsible for transporting the parts from the system's entrance to the workstations. With this, flexibility in the production process will increase, which will be reflected in system's productivity. © 2010 IFAC.

2010

Optimization of hexapod locomotion using genetic algorithms

Authors
Silva, MF; Barbosa, RS; MacHado, JAT;

Publication
Proceedings of the IASTED International Conference on Modelling, Identification and Control

Abstract
Different strategies have been adopted for the optimization of legged robots, either during their design and construction phases, or during their operation. Evolutionary strategies are a way to imitate nature replicating the process that nature designed for the generation and evolution of species. This paper presents a genetic algorithm, running over a simulation application of legged robots, that allows the optimization of several locomotion, model and controller parameters, for different locomotion speeds and gaits. Here are studied the model and locomotion parameters that optimize the robot performance, in a large range of distinct velocities.

2010

Development of an wheeled climbing robot for metallic surfaces with permanent magnetic system dynamic adjustment

Authors
Oliveira A.L.C.; Silva M.F.; Barbosa R.S.;

Publication
Emerging Trends in Mobile Robotics- Proceedings of the 13th International Conference on Climbing and Walking Robots and the Support Technologies for Mobile Machines, CLAWAR 2010

Abstract
This paper presents the mechanical construction of a climbing robot with wheeled locomotion and adhesion through permanent magnets. This machine is intended to be used in the inspection of different types of ferromagnetic structures, in order to, for instance, detect weaknesses due to corrosion, particularly in fuel tanks, ship hulls, etc. The vehicle will have a semi-autonomous behaviour, allowing a remote inspection process controlled by a technician, this way reducing the risks associated with the inspection of tall structures and ATEX places. The distinguishing characteristic of this robot is its dynamic adjustment system of the permanent magnets in order to assure the machine adhesion to the surfaces, even when crossing irregular and curved surfaces.

2010

433 MHz implantable wireless stimulation of spinal nerves

Authors
Carmo, JP; Ribeiro, JC; Ribeiro, JF; Silva, MF; Mendes, PM; Correia, JH;

Publication
17th IEEE International Conference on Electronics, Circuits, and Systems, ICECS 2010, Athens, Greece, 12-15 December, 2010

Abstract

2010

DEVELOPMENT OF AN WHEELED CLIMBING ROBOT FOR METALLIC SURFACES WITH PERMANENT MAGNETIC SYSTEM DYNAMIC ADJUSTMENT

Authors
Oliveira, ALC; Silva, MF; Barbosa, RS;

Publication
EMERGING TRENDS IN MOBILE ROBOTICS

Abstract
This paper presents the mechanical construction of a climbing robot with wheeled locomotion and adhesion through permanent magnets. This machine is intended to be used in the inspection of different types of ferromagnetic structures, in order to, for instance, detect weaknesses due to corrosion, particularly in fuel tanks, ship hulls, etc. The vehicle will have a semi-autonomous behaviour, allowing a remote inspection process controlled by a technician, this way reducing the risks associated with the inspection of tall structures and ATEX places. The distinguishing characteristic of this robot is its dynamic adjustment system of the permanent magnets in order to assure the machine adhesion to the surfaces, even when crossing irregular and curved surfaces.

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