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Detalhes

Detalhes

  • Nome

    Rui Esteves Araujo
  • Cluster

    Energia
  • Cargo

    Investigador Sénior
  • Desde

    01 abril 2010
002
Publicações

2020

Active Fault Diagnosis Method for Vehicles in Platoon Formation

Autores
Lopes, A; Araujo, RE;

Publicação
IEEE Transactions on Vehicular Technology

Abstract

2020

Inversion-based approach for detection and isolation of faults in switched linear systems

Autores
Silveira, AM; Araújo, RE;

Publicação
Electronics (Switzerland)

Abstract
This paper addresses the problem of the left inversion of switched linear systems from a diagnostics perspective. The problem of left inversion is to reconstruct the input of a system with the knowledge of its output, whose differentiation is usually required. In the case of this work, the objective is to reconstruct the system’s unknown inputs, based on the knowledge of its outputs, switching sequence and known inputs. With the inverse model of the switched linear system, a real-time Fault Detection and Isolation (FDI) algorithm with an integrated Fuzzy Logic System (FLS) that is capable of detecting and isolating abrupt faults occurring in the system is developed. In order to attenuate the effects of unknown disturbances and noise at the output of the inverse model, a smoothing strategy is also used. The results are illustrated with an example. The performance of the method is validated experimentally in a DC-DC boost converter, using a low-cost microcontroller, without any additional components. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.

2020

A new approach for the diagnosis of different types of faults in DC-DC power converters based on inversion method

Autores
Silveira, AM; Araujo, RE;

Publicação
ELECTRIC POWER SYSTEMS RESEARCH

Abstract
This paper presents theory, a new approach and validation results for fault detection and isolation (FDI) in DC-DC power converters, based on inversion method. The developed method consists on the inversion-based estimation of faults and change detection mechanisms adapted to the power converters context. With the inverse model of a switched linear system, we have designed a real-time FDI algorithm with an integrated fuzzy logic scheme which detects and isolates abrupt changes (faults) at unknown time instants. A smoothing strategy is used to attenuate the effect of unknown disturbances and noise that are present at the outputs of this inverse model. Once the fault event is detected, a dedicated fuzzy-logic-based scheme is proposed to isolate the four types of faults: switch, voltage and current sensor, and capacitor. The performance of the proposed method is verified experimentally to detect and isolate the mentioned faults in the DC-DC boost power converter.

2019

Steganography for indoor location

Autores
Moutinho, J; Freitas, D; Araújo, RE;

Publicação
Proceedings of the AES International Conference

Abstract
This paper presents steganography techniques that were employed to avoid human perception of the added audio signals in an acoustic environment for indoor location purposes. In the context of audio forensics, indoor location can be used in connection with the detection of a crime. The validation of using the acoustic channel for data transmission over an almost imperceptible audio signal enables the possibility of a receiving processing mobile device (such as a smartphone) to localize itself absolutely by receiving and processing such signals from the infrastructure. Some possible applications will be presented demonstrating the utility of this technology. This paper will present the use of almost imperceptible audio signals to successfully transmit hidden information using a spread spectrum data-hiding technique or a music/speech cover signal and the echo hiding technique.

2019

Analysis and Design of a Speed Controller for Switched Reluctance Motor Drive

Autores
Pereira, M; Araújo, RE;

Publicação
U.Porto Journal of Engineering

Abstract
This paper presents a high precision speed control of the reluctance machine for electric drive applications. To get high resolution speed control, it is developed a cascade control algorithm based on linear control technique. The controller was designed using the Root Locus Methodology and has been implemented on a numerical simulation platform. It is shown that Root Locus Methodology design is a viable approach, and that various problems associated with the structural torque ripple of the electric motor can be solved. An important aspect of this work is the role played by model linearization in testing the sensitivity of the controller performance to specific parameter changes. The controller was implemented in a simulated non-linear switched reluctance motor model in order to evaluate their performances. Simulations results show that the high-performance control for Switched Reluctance Motor has been achieved.

Teses
supervisionadas

2019

Fault-Tolerant Control System on Cooperative Overactuated Electric Vehicle Platoon

Autor
António Manuel Figueiredo Lopes

Instituição
UP-FEUP

2019

Fault tolerant control with actuator failure detection for a multi motor electric vehicle

Autor
Bruno Laranjo dos Santos

Instituição
UP-FEUP

2019

Development of a battery management system interface for adapting second life batteries to energy storage

Autor
Jorge Lopes dos Santos Teixeira Carrondo

Instituição
UP-FEUP

2019

Módulo de Controlo e Manutenção de Equipamentos Ligeiros de Obra

Autor
José Pedro Sucena Gonçalves

Instituição
UP-FEUP

2019

Soluções técnicas de carregamento para a massificação do uso do veículo elétrico

Autor
João Machado Mariares de Almeida

Instituição
UP-FEUP