![]() Using differential equations allows one to fully specify dynamic behavior however, they are inadequate to design the reactive and transformational behaviors of the designed system parts. It is possible to define dynamic behavior of the system using time derivative function. In addition, SysML introduces a new kind of diagram called a parametric diagram used to define mathematical relations among attributes of the system using equations and inequalities. Part of the control systems specification includes dynamic (time-dependent) continuous behavior of the control algorithms and the physical environment these systems interact with the plant. SysML supports the specification, analysis, design, and verification of a broad range of complex systems such as control systems. This acknowledges the need for continuity from systems engineering to software engineering in the development of software intensive systems. SysML extends a subset of the Unified Modeling Language (UML) targeted mainly for software engineering. The need for a standard modeling language originates from the fact that interdisciplinary complex systems, which require high-quality efficient systems engineering activities, are being developed by different teams, sometimes across companies in different countries, using a variety of tools and methods. The Systems Modeling Language (SysML) has been under development since 2001 by the International Council of Systems Engineering (INCOSE) and the Object Management Group (OMG) organizations, as a standard modeling language for model-based systems engineering (MBSE). The authors also show the overall approach using a Dual Clutch Transmission (DCT) and a Cruise Control System as examples. The integration with a CAS enables the evaluation of mathematical constraints defined in SysML parametric diagrams. ![]() The integration with Simulink enables users to perform systems engineering process in a SysML model, while designing continuous control algorithms and plant behavior in Simulink, and to validate the behavior by simulating the overall composition in Simulink. The authors demonstrate how they can integrate a SysML modeling tool (IBM Rational Rhapsody) with a proprietary simulation tool (MathWorks Simulink) and a Computer Algebra System (CAS) to validate system specification. SysML supports the specification, analysis, and design of a broad range of complex systems such as control systems. The Systems Modeling Language (SysML) is a standard, general-purpose, modeling language for model-based systems engineering (MBSE). ![]()
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