This research aims to support for nano-satellite developers to build mutual understanding about their own system using our self-developed web application and educational programs, in order to proceed the developing process rationally and efficiently communicated with team members and hence to improve the success rate of missions. Projects of complex systems developments such as nano-satellite projects face schedule delays and cost overruns caused by an incomplete requirement analysis that considers being not mutually exclusive, not collectively exhaustive, not verified, and not validated. Systems engineering (SE) is expected to resolve these problems. Furthermore, model-based systems engineering (MBSE) might be suitable for university-led projects because of its predominance of traceability and re-usability, which are the lifelines of projects with frequent member substitutions. However, off-the-shelf MBSE tools are very difficult for students to use effectively. Thus, BALUS, which is considered to be a user-friendly and practical system modeling tool, has been developed. An early prototype of BALUS was introduced to the actual nano-satellite project; however, the trial was not successful. The operation of requirement analysis was an important problem to solve and led to an urgent demand for a framework to use BALUS. Therefore, we proposed a framework that concentrates on the modeling method to create requirement diagrams. Further, it presents a guideline for the hierarchical structure and decomposition level and recommends using a layered approach applied to create requirement diagrams and activity diagrams. We also experimented with two types of design education practices using BALUS with the proposed framework. These practices revealed that the ability of requirement analysis was remarkably improved and the proposed framework is suitable for use with BALUS. In conclusion, BALUS was useful for the MBSE education and activities of students and engineers of small an
展开▼
