Applicability of SysML to the Early Definition Phase of Space Missions in a Concurrent Environment

Abstract

One of latest trends in the field of Systems Engineering (SE) is increased use of models next to and in stead of documents to capture and control information on the system-of-interest under development. This approach is generally called Model Based Systems Engineering (MBSE). An important element of the MBSE approach is the language that is used. The Systems Modeling Language, SysML, is often seen as most promising language by the SE community.

The Concurrent Design Facility (CDF) is a state-of-the-art facility in the field of concurrent engineering and systems engineering research, used to perform feasibility studies for potential future space mission of the European Space Agency (ESA). Currently the CDF uses a simple Excel-based modelling approach. As not much experience with SysML is present at the CDF, research was performed to investigate the potential added value of applying MBSE using SysML to the work performed in the CDF. A methodology and a standard model were developed, followed by its application in a real CDF study to investigate the added value.

From the evaluation of the research, it is concluded that MBSE using SysML is in line with the concurrent engineering approach but is only partially applicable to early design studies.Many of the activities performed during the case study required a significant time effort with too little added value. Also, the tool used proved limiting in some of activities. Added value was observed in the capturing of the trade options, decisions and trade rationale in combination with the requirements. It is proposed to integrate these aspects into the CDF studies as starting point for the transition phase to a more model-based approach using SysML.