On the Use of UML for Modeling Mechatronic Systems

• Published in: IEEE transactions on automation science and engineering Vol. 4; no. 1; pp. 105 - 113
• Main Authors: Secchi, C., Bonfe, M., Fantuzzi, C.
• Format: Journal Article
• Language: English
• Published: Piscataway, NJ IEEE 01.01.2007; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Assembly systems; Automated; Automatic control; Automation; Bond graphs; Computer based modeling; Computer science; control theory; systems; Control system synthesis; Control systems; Control theory. Systems; Design engineering; Dynamical systems; Dynamics; Exact sciences and technology; Mathematical models; Mechanical engineering. Machine design; Mechatronics; Modelling and identification; Object oriented modeling; object-oriented design; Object-oriented programming; Physics computing; Protocols; software engineering; Specification languages; Specifications; system modeling; Unified modeling language; unified modeling language (UML); Object-oriented languages; Control program; unified modeling language (UML); Digital processing; Computer control; Modeling; Modularity; system modeling; Aspect oriented; Behavioral analysis; Semantics; object-oriented design; Bond graph; Object oriented; Unified modelling language; software engineering; Electric motor; Assembly; Supervision; Validation; Specification language; Description language; Mechatronics; Process control; Knowledge representation; Bond graphs; Industrial complex; Software component; Electric drive; Engineering design; Distributed algorithm; Pneumatic drive; Motion control; Monitoring control system
• ISSN: 1545-5955; 1558-3783
• DOI: 10.1109/TASE.2006.879686

This paper describes a modeling language that aims to provide a unified framework for representing control systems, namely, physical plants coupled with computer-based control devices. The proposed modeling methodology is based on the cardinal principle of object orientation, which allows describing both control software and physical components using the same basic concepts, particularly those of capsules, ports, and protocols. Furthermore, it is illustrated how the well-known object-oriented specification language unified modeling language can be adopted, provided an adequate formalization of its semantics, to describe structural and behavioral aspects of control systems, related to both logical and physical parts. Note to Practitioners-The development of an automated system within an industrial setting is a complex task, whose successful result depends on the joint efforts of a team of designers with different scientific backgrounds and specialized knowledge. In fact, an automated system is typically composed of a mechanical assembly, which must be precisely designed and manufactured, and a set of sensors and actuators (e.g., electrical drives, pneumatic systems, etc.), which are, on their turn, controlled most of the time by means of digital processors. Of course, both electrical parts and control algorithms (e.g., proportional, integral, and derivative (PID) regulators, logic and supervisory control, reference trajectories for mechanical motions, etc.) should be designed with the same care given to mechanical aspects. Moreover, it is undeniable that none of the various parts composing the automated system design specification can, on their own, allow engineers to understand the actual behavior of the whole system, especially without a common description language that is understandable for all of the designers. The present paper introduces a unified language which aims to support integrated design specifications of automated systems, including the dynamics of heterogeneous physical assemblies, the discrete-event behavior of distributed control software, and the specification of interface ports between the plant and the control system. With the proposed language, it is possible to obtain a complete picture of the automated system suitable for its simulation, documentation, and validation. The modeling language described in the paper supports the principles of object orientation. This choice moves in the direction of enhancing modularity and reusability properties of design specifications, which are aspects of great importance in the design practice. Moreover, the object-oriented approach to automated systems design proposed in the paper aims to introduce the concept of "design by extension" in the manufacturing industry. This means that the definition of specialization relationships between classes of components implies that those components should be designed in order to be substitutable with each other, especially from a dynamic point of view. This aspect will be the subject of further papers illustrating other practical insights on the use of object-oriented models for automated systems