Percorrer por autor "Santos, Adriano A."
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- Controlo de Sistemas PneumáticosPublication . Santos, Adriano A.Neste artigo apresenta-se várias abordagens aos problemas de controlo de sistemas industriais tendo como base de atuação a pneumática. São apresentadas as metodologias de controlo de sistemas pneumáticos mais correntes como sejam o método de Cascata, de Memórias e dos Mapas de Karnaugh quer ao nível do controlo pneumático quer elétrico. Apresentam-se diversas abordagens de controlo destes mesmos sistemas recorrendo a autómatos programáveis (PLC).
- IEC 61499 REPLICATION FOR FAULT TOLERANT SYSTEMPublication . Santos, Adriano A.; Sousa, Mário de; Magalhães, Pessoa; Silva, António Ferreira daThe IEC 61499 was developed thinking about the new generation of distributed control and automation systems. This provides essential resources for the development of distributed systems such as encapsulation, portability and reconfiguration. In this sense, and to ensure confidence in the operation should be implemented fault tolerance techniques dealing with hardware failures and errors off software associated with us where the distributed application runs. In this paper, we propose an approach to deal with failures in distributed systems tolerance problems, based on a replication model based on replication software/hardware as a means to achieve confidence in the operation.
- Integration of Artificial Vision and Image Processing into a Pick and Place Collaborative Robotic SystemPublication . Santos, Adriano A.; Schreurs, Cas; Silva, António Ferreira da; Pereira, Filipe; Felgueiras, Carlos; Lopes, António M.; Machado, Josén the field of robotics, pick and place applications are becoming increasingly popular due to their ability to automate repetitive tasks that can create temporary or permanent injuries. To enhance the efficiency of these applications, object recognition using a fixed camera or one mounted on a robotic hand has been employed. This paper explores the possibilities of implementing a low-cost camera into a collaborative robotic system. A software architecture has been developed, including modules for perception, pick and place, and part transfer. A comprehensive overview of various intuitive drag-and-drop image processing technologies and their suitability for object recognition in a robotic context is provided. The challenges related to lighting and the effect of shadows in object recognition are discussed. A critical assessment is made of the architecture development platform as well as the study and the results are performed, and the effectiveness of the proposed solution based on the Niop architecture is verified.
- Plataforma de E-maintenance aplicada a um sistema logístico de viaturasPublication . Santos, Adriano A.; Vale, Zita; Abreu, RuiA evolução tecnológica, com particular incidência nas tecnologias de informação, e a necessidade de uma integração cada vez mais profunda do sector da manutenção na gestão estratégica global da empresa, contribuíram para o aparecimento dos sistemas de e-maintenance. Por outro lado, os conceitos associados à manutenção deverão estar cada vez mais associados à manutenção remota. Assim, o desenvolvimento de plataformas de e-maintenance, entendidas como a agregação de software e hardware e outras tecnologias integradas, permitiram implementar serviços, que foram determinantes para a evolução deste conceito. Nesta comunicação apresenta-se uma plataforma de e-maintenance aplicada a um sistema automatizado de pesagem de viaturas na indústria cimenteira. O sistema é baseado na monitorização constante da degradação dos componentes críticos que, através de um sistema de alertas, permite antecipar as falhas notificando, atempadamente, a equipe de operadores específicos. A aplicação foi desenvolvida na Framework SLV Cement da empresa Cachapuz. Possuindo vários módulos de gestão da manutenção esta plataforma permite definir e controlar todo o fluxo de informação.
- Replication in distributed systems using IEC 61499 standardPublication . Santos, Adriano A.; Sousa, Mário deThe international Electrotechnical Commission (IEC) 61499 architecture incorporated several function block with which distributed control application may be developed, and how these are interpreted and executed. However, due the distributed nature of the control applications, many issues also need to be taken into account. Most of these are due to the new error model and failure modes of the distributed hardware on which the distributed application is executed and also due the incomplete standards definition of the execution models. IEC 61499 frameworks does not clarify how to handle with replication of software and hardware components. In this paper we propose a replication model for IEC 61499 applications and which mechanisms and protocols may be used for their support.
- Teaching Control Pneumatic and Electro-pneumatic Circuits – A New MethodPublication . Silva, António Ferreira da; Santos, Adriano A.Karnaugh map is a method to simplify a logical equation, or convert a truth table in the corresponding logic circuit. This paper presents an alternative way to use the Karnaugh maps that minimizes the logical conditions of command for pneumatic circuits, whether the command is pneumatic or electric. In the last case, the method also permits the control of the circuit through a programmable controller (PLC). In practice, ensure a series of sequential movements in an automatic cycle is to find the set of equations which are executed ensure the realization of the desired sequence. The application of the method itself becomes dispensable analysis of speed or course of the cylinders (irrelevant features to the materialization of the command sequence). It means therefore that the control cylinders equations that will allow his movements (called output variables) are function only of two types of variables (input variables), the position of each cylinder (end-of-stroke valves) and if necessary memory variables. The proposed methodology ensures not only the desired sequential cycle, as well as the minimization of the variables necessary for control commands. To simplify substantially the explanation of the method, it is assumed that each pneumatic cylinder is associated with two end-of-stroke valves for detecting its position. The description as well as the applicability of the proposed methodology will be illustrated using a concrete problem of industrial automation. The methodology described here, will extend its use not only in industrial applications, but also the educational level in terms of engineering schools allowing a particular use in the automation of laboratories in the field of pneumatic control circuits and sequential electro (it is currently teaching in automation course unit of mechanical engineering in ISEP).