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Faults occurrence is inevitable in real world and a practical alternative approach is the reduction of fault consequences. Despite of this, the majority of buildings control systems do not have such mechanisms. Thus, this work proposes a procedure for the modeling of control systems for intelligent buildings which considers their functional specifications(More)
— Automation and control systems(ACSs) must ensure the fulfillment of the current requirements in manufacturing systems, such as flexibility, distributed architecture, and agility in response to changes imposed by the market or the inevitable occurrence of faults. In this context, one solution to design ACSs is a combination of techniques such as holonic(More)
In this paper, a supervisor system, able to diagnose different types of faults during the operation of a proton exchange membrane fuel cell is introduced. The diagnosis is developed by applying Bayesian networks, which qualify and quantify the cause–effect relationship among the variables of the process. The fault diagnosis is based on the on-line(More)
This paper introduces a new approach for the modelling of hybrid productive systems. This approach is based on Petri nets to represent the discrete part, differential equations to describe the continuous part and Object-Oriented paradigm to deal with the complexity problem in real systems. During the modelling process, the Unified Modelling Language (UML)(More)
This paper introduces a methodology for modeling and analyzing fault-tolerant manufacturing systems that not only optimizes normal productive processes, but also performs detection and treatment of faults. This approach is based on the hierarchical and modular integration of Petri Nets. The modularity provides the integration of three types of processes:(More)
Safety Instrumented Systems (SIS) are designed to prevent and / or mitigate accidents, avoiding undesirable high potential risk scenarios, assuring protection of people's health, protecting the environment and saving costs of industrial equipment. Standards such as ANSI/ISA S.84.01; IEC 61508, IEC 61511, among others, guide different activities related to(More)
The Flexible Manufacturing Systems (FMS) belong to class of productive systems in which the main characteristic is the simultaneous execution of several processes and sharing a finite set of resource. The process is defined as being a sequence of steps or activities. These activities are established a priori as being activities of transformation and/or(More)
Escola Politécnica da USP – pemiyagi@usp.br This paper presents a set of special requirements to development of intelligent building control software. It includes the degeneration technique (gradual reduction of the building service level). The method involves an organized activities sequence that results in artifacts such as models and control software(More)