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Publications

Publications by CRIIS

2011

Shop Floor Scheduling in a Mobile Robotic Environment

Authors
Pinto, AM; Rocha, LF; Moreira, AP; Costa, PG;

Publication
PROGRESS IN ARTIFICIAL INTELLIGENCE

Abstract
Nowadays,it is far more common to see mobile robotics working in the industrial sphere due to the mandatory need to achieve a new level of productivity and increase profits by reducing production costs. Management scheduling and task scheduling are crucial for companies that incessantly seek to improve their processes, increase their efficiency, reduce their production time and capitalize on their infrastructure by increasing and improving production. However, when faced with the constant decrease in production cycles, management algorithms can no longer solely focus on the mere management of the resources available, they must attempt to optimize every interaction between them, to achieve maximinn efficiency for each production resource. In this paper we focus on the presentation of the new competition called Robot Factory, its environment and its main objectives, paying special attention to the scheduling algorithm developed for this specific case study. The findings from the simulation approach have allowed us to conclude that mobile robotic path planning and the scheduling of the associated tasks represent a complex problem that has a strong impact on the efficiency of the entire production process.

2011

LEADER FOLLOWING FORMATION CONTROL FOR OMNIDIRECTIONAL MOBILE ROBOTS The Target Chasing Problem

Authors
do Nascimento, TP; Fontes, FA; Moreira, AP; Conceicao, AGS;

Publication
ICINCO 2011: PROCEEDINGS OF THE 8TH INTERNATIONAL CONFERENCE ON INFORMATICS IN CONTROL, AUTOMATION AND ROBOTICS, VOL 2

Abstract
This paper describes a novel approach in formation control for mobile robots. Here, a Nonlinear Model Predictive Controller (NMPC) is used to maintain the formation of three omnidirectional mobile robots. The details of the controller structure are presented as well as its functionality in a soccer robot team. Three Middle Size League Robots are used for evaluation. A case of study based in a soccer robot situation is presented, developed, and implemented to evaluate the performance of the controller. Simulations results are presented and discussed.

2011

A Generic Framework for Multi-robot Formation Control

Authors
do Nascimento, TP; Scolari Conceição, AG; Alves, HP; Fontes, FA; Moreira, AP;

Publication
RoboCup 2011: Robot Soccer World Cup XV [papers from the 15th Annual RoboCup International Symposium, Istanbul, Turkey, July 2011]

Abstract
This paper describes a novel approach in formation control for mobile robots. A Nonlinear Model Predictive Controller (NMPC) is used to control the formation of a heterogeneous mobile robots group. The desired formation is formed by an holonomic robot and a nonholonomic robot. The same nonlinear controller is used in both robots with the same cost function. The details of the controller structure are presented in order to track a fixed target departing from different positions in the field avoiding collisions with each other. A soccer robot competition field is used to present the simulations to evaluate the performance of the controller. © 2012 Springer-Verlag Berlin Heidelberg.

2011

Location and automatic trajectory calculation of mobile objects using radio frequency identification

Authors
Xavier, J; Abreu, PH; Reis, LP; Petry, M;

Publication
Proceedings of the 6th Iberian Conference on Information Systems and Technologies, CISTI 2011

Abstract
The area of object/people location consists on the identification of their instantaneous movement in a given area of space and during a given time frame. This location takes an important role because it can help rectify trajectories (in the case of autonomous objects) or improve the performance (in the case of sport practices). In this research project, a system based on RFID that automatically rectifies a location and calculates a wheelchair trajectory in a pre-defined route will be presented. For that, a commercial location system was used as well as a wheelchair and two routes: a linear one and a complex route. In order to correct the trajectory a low pass filter was also used. The obtained results showed that this approach decreased 38% of the mean squared error and in more than 7 centimeters the maximum error. In the future this research work will be enclosed in a new project where a multi agent system capable of executing a management of an autonomous wheelchair set in a hospital environment will be developed. © 2011 AISTI.

2011

Location and Automatic Calculation of trajectory in Furniture Objects Using RFID

Authors
Xavier, J; Abreu, PH; Reis, LP; Petry, M;

Publication
SISTEMAS E TECNOLOGIAS DE INFORMACAO, VOL I

Abstract

2011

Stereoscopic image sensor with low-cost RGB filters tunned for the visible range

Authors
Carmo, JP; Rocha, RP; Silva, MF; Ferreira, DS; Ribeiro, JF; Correia, JH;

Publication
18th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2011, Beirut, Lebanon, December 11-14, 2011

Abstract

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