Rational Rhapsody Research Articles

Safety critical systems design for civil aircrafts by model based systems engineering

A civil aircraft safety critical system design scheme using model based systems engineering (MBSE) is proposed in this paper, with considering the civil aircraft/systems design standard and thchnology frontier fields. Considering the availability and integrity of the system functions, civil aircrafts/systems design and safety assessment process are esteblished by using MBSE. Civil aircraft brake system development and assessment scheme are proposed by MBSE tools IBM DOORS and Rational Rhapsody. Use cases, functions flow, and state-machines of the system are set up by corresponding models in requirement analysis, function analysis and design synthesis phases. The system architecture which can guarantee the function availability and safety is designed by fault tree analysis. System models are verified by SysML and Simulink collaborative simulation, and Panel diagram interactive interface.

Creating Rich Human-machine Interfaces with Rational Rhapsody and Qt for Industrial Multi-core Real-time Applications

Industrial real-time applications and modern rich and friendly user interfaces have been separated worlds for a long time. But today, customers demand advanced user interface solutions for their real-time products, in order to gain competitive advantage in their markets. This creates to the development teams the big challenge of integrating those two worlds. This paper presents a real-life experience of the development of a system and software architecture for a real-time application with an advanced user interface. Starting with the analysis of the existing needs and requirements, the paper presents the followed steps for the selection of the most appropriate hardware platform, operating systems, Model driven development and other working tools for each architectural requirement, the process of adaptation and integration of the different environments and development tools, and finishes with the developed system results. In addition to the presented results, an analysis of the possibilities of reusing the created platform for other products is presented, following the same process and making the required adaptations, in order to reproduce the obtained benefits in other real-time industrial solutions with advanced user interfaces.

Model Based Control System Design Using SysML, Simulink, and Computer Algebra System

The Systems Modeling Language (SysML) is a standard, general-purpose, modeling language for model-based systems engineering (MBSE). SysML supports the specification, analysis, and design of a broad range of complex systems such as control systems. 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. 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 integration with a CAS enables the evaluation of mathematical constraints defined in SysML parametric diagrams. The authors also show the overall approach using a Dual Clutch Transmission (DCT) and a Cruise Control System as examples.