Conceptual Model for Space Mission SystemsDesign

摘要

Modelling tools and methodologies without concerns about human understanding may not bernsuitable for communicating with stakeholders, customers, or management. There are many factorsrnthat can increase understandability. Using a generic systems engineering modelling languagerncertainly helps but is not always enough. The understandability of modelling can be improved byrnusing better modelling techniques and strategies, which might be part of a coherent methodologyrnwith a deliberate emphasis on communicability. The paper describes the application of SystemsrnModeling Language (SysML) to the design of a JPL mission using the Object Oriented SystemrnEngineering Method (OOSEM). Complementary formal modelling using the Web ontologyrnlanguage (OWL) has also been investigated. Using only traditional means, under increasedrndemands on productivity and decreased resources, system integration may become high risk, andrnlifecycle support is expensive and may result in rapidly outdated components. Model-basedrnsystems engineering (MBSE) is showing promise as a solution to this problem in addition to andrnenhancing more traditional approaches. The space mission systems models represent sciences andrntechnologies including astrophysics, physics, electronics, mechanisms, hardware and software.rnRepresentations of system architecture specification, requirements, evaluation of alternativernarchitectures and trade studies, including static simulation of the performance are grouped intornviews that represent different stakeholder viewpoints. The human understandability of thernresulting models and how the modeling process can increase communication andrnunderstandability has also been addressed and observations are reported.