2018
Autores
Vidal, S; Oliveira, PM; Oliveira, J; Pinho, T; Cunha, JB;
Publicação
2018 13TH APCA INTERNATIONAL CONFERENCE ON CONTROL AND SOFT COMPUTING (CONTROLO)
Abstract
Motivating undergraduate engineering students for the area of control engineering can be a challenging task. Posicast control can be used as a simple technique to introduce both open-loop and closed-loop control systems. This paper addresses several approaches to teach Posicast control involving simulation and practical implementations. A demonstration experiment using the robotic arm (UR5) is reported here as an alternative practical system which can be used to demonstrate Posicast Control. Results obtained from student's perceptions of the reported experiment are presented.
2018
Autores
Oliveira, PM; Vrancic, D;
Publicação
13th APCA International Conference on Control and Soft Computing, CONTROLO 2018 - Proceedings
Abstract
Cascade control is among the mostly used process control systems single-loop performance enhancers. The simultaneous design of series cascade controllers can be a challenging problem, due to the primary and secondary loops interaction. In this paper a swarm based technique is proposed to simultaneously design series cascaded proportional integral and derivative controllers. The design is based on the integral absolute primary error minimization, subjected to vector margins constraints both for the secondary and primary loops. Simulation results are presented to illustrate the merits of the proposed technique. © 2018 IEEE.
2018
Autores
Goncalves, A; Oliveira, PM; Varajao, J;
Publicação
2018 13TH IBERIAN CONFERENCE ON INFORMATION SYSTEMS AND TECHNOLOGIES (CISTI)
Abstract
Information Systems projects are often complex enterprises, since they involve the adoption of information technologies in organizational contexts. As such, they should be carefully managed considering the various aspects that influence their success. This paper presents a literature review focused on the success factors of information technology and information systems projects.
2018
Autores
Vrancic, D; Oliveira, PM; Huba, M;
Publicação
2018 13TH APCA INTERNATIONAL CONFERENCE ON CONTROL AND SOFT COMPUTING (CONTROLO)
Abstract
The paper presents extension of model-based disturbance rejection method based on Magnitude optimum method. The original method requires the pre-chosen values of controller and compensator filter values, which might result in a relatively noisy process input signals that are not tolerated in practice. In order to keep the process input noise under control, the proposed tuning method requires user-defined controller and compensator noise gain for high frequencies, instead. The experiments on process models show that the proposed approach is successful even though the actual and the identified process models do not match.
2018
Autores
Solteiro Pires, EJ; Tenreiro Machado, JA; Moura Oliveira, PBd;
Publicação
Hybrid Intelligent Systems - 18th International Conference on Hybrid Intelligent Systems, HIS 2018, Porto, Portugal, December 13-15, 2018
Abstract
Bioinspired search algorithms are widely used for solving optimization problems. The evolution progress isusially measured by the fitness value of the population fittest element. The search stops when the algorithm reaches a predetermined number of iterations, or when no improvement is achieved after some iterations. Usually, no information, behind the best global objective value, is fed into the algorithm to influence its behavior. In this paper, a entropy metric is proposed to measure the algorithm convergence. Several experiments are carried out using a particle swarm optimization to analyze the metric relevance. Moreover, the proposed metric is used to implement a strategy to prevent premature convergence to suboptimal solutions. The results show that the index is useful for analyzing and improving the algorithm convergence during the evolution. © 2020, Springer Nature Switzerland AG.
2018
Autores
Silva, S; Duarte, D; Barradas, R; Soares, S; Valente, A; Reis, MJCS;
Publicação
Human-Centric Robotics- Proceedings of the 20th International Conference on Climbing and Walking Robots and the Support Technologies for Mobile Machines, CLAWAR 2017
Abstract
The Portuguese Micromouse Contest®* is an innovated robotic contest in Portugal that address the need to enhance student interest and performance in science, technology, engineering, and mathematics (STEM) courses, while fostering skills that are important prerequisites for IT careers. To facilitate the access to younger students a robot kit and an Arduino library was developed and made available on GitHub. Some of the library examples include the common algorithms used to solve mazes, like the Flood Fill, Right or Left Wall Following to name a few. Recursive Backtracking algorithm is often used to solve mazes especially if there is a lot of computer power. This is not the case of the Arduino platform that only has 2.5 KB of SRAM and a clock speed of 16 MHz, so implementing Recursive Backtracking becomes quite difficult. In this work we show how to implement Recursive Backtracking to find if there are better solutions for solving the maze. We also show the memory measurements for three Arduino common platforms the Leonardo, the UNO and the DUE. © 2018 by World Scientific Publishing Co. Pte. Ltd.
The access to the final selection minute is only available to applicants.
Please check the confirmation e-mail of your application to obtain the access code.