Design of Active Holonic Fault-Tolerant Control Systems

Abstract

The adequate evaluation of new technologies in productive systems that perform multiple and simultaneous processes, exploring the intense sharing of resources, demands the updating of supervision and control systems. On the other hand, totally infallible systems are unviable, and for a flexible productive system (FPS) does not to suffer interruptions due to component failure, the concept of AFTCS (active fault-tolerant control system) mechanism must be adopted. In this sense, holonic control system (HCS) is considered a trend for an intelligent automation and the combination of HCS techniques and AFTCS is fundamental to assure efficiency, flexibility and robustness of FPSs. Therefore, this work presents a procedure for the modeling of active holonic fault-tolerant control system (AHFTCS) that considers AFTCS' requirements and interpreted Petri net for the description of the systems' behavior. This method is applied to an intelligent building (IB) as a class of FPS and the results are presented.

A Service-Oriented and Holonic Control Architecture to the Reconfiguration of Dispersed Manufacturing Systems

“…Furthermore, control architecture should be based on standards ontologies, as proposed in ANSI/ISA 88/95 [11] and ADACOR [10]. In previous studies [12], [13], [14], we applied the HCS with fault tolerance mechanisms for intelligent building, while in [15] our methodology was applied for manufacturing system (MS) and for the description of the control mode switching between two operational modes. We observe that: (i) a suitable ontology can provide a semantic model for interaction in RDMS; (ii) a trading mechanism is more favorable than a requestresponse communication format between holons; (iii) patterns emerge without an environment that facilitates the development of new models; (iv) there are few proposals regarding strategies for the system reconfiguration; (v) another challenge is how to compose holarchies that accomplish a productive task with constraints to consider the lead time; and (vi) there are still a small number of applications combining HCS and SOA concepts, or more specifically with RDMS.…”

A method to design a manufacturing control system considering flexible reconfiguration

“…In [3], [10], we combined HCS with fault-tolerant control system and the resulting system was named active holonic control system (AHCS). In [11], AHCS was applied to MS, in which the focus lay on the reconfiguration and description of the control mode switching.…”