Modelica, FMI and SSP for LOTAR of Analytical mBSE models: First Implementation and Feedback

Abstract

LOng Time Archiving and Retrieval (LOTAR) of models is key to using the full capabilities of model-Based System Engineering (mBSE) in a system lifecycleincluding certification. The LOTAR MBSE workgroup is writing the EN/NAS 9300-Part 520 to standardize the associated process, in the aeronautics industry, and suggests the usage of Modelica, FMI and SSP standards for its purpose. Acceptance of such a process requires a match between industrial needs and software vendor implementations. This is helped by a tool-agnostic implementation of the process and following specific adaptations within the Modelon Impact software. This initiativeinside the LOTAR workgroupshighlights the suitability of such a process but also points at flaws or overhead due to the lack of connection between the Modelica, FMI and SSP standards, as well as the MoSSEC (ISO 10303-243) standard. The recommendations proposed in this document could have a significant impact on the final adoption of the LOTAR standardrelying on Modelica, FMI and SSP standards.

Realizing Interoperability between MBSE Domains in Aircraft System Development

“…Furthermore, initiatives related to managing SSP and FMI compliant digital artifacts throughout a product life cycle is ongoing in both industry and academia. See for example Coïc et al [30] and their work on the LOTAR manifest that aims to provide digital artifacts with unique identifiers ensuring traceability throughout the life-cycle stages. Similarly, the SSP Traceability layer upon the SSP standard currently under development aims to specify a tool-independent XML format incorporating life-cycle information required to realize a credible simulation process in terms of quality assurance, traceability, and re-usability [31].…”

Towards Modelica Models with Credibility Information

“…The prime objective of the LOTAR (LOng Term Archiving and Retrieval) International Consortium [16] "is the creation and deployment of the EN/NAS 9300 series of standards for long-term archiving and retrieval of digital data, based on standardized approaches and solutions" in the aerospace and defense industry. The LOTAR MBSE workgroup suggests the usage of the Modelica, FMI (https://fmi-standard.org (accessed on 30 July 2022)) and SSP (https://ssp-standard.org (accessed on 30 July 2022)) standards of the Modelica Association (https://modelica.org/ (accessed on 30 July 2022)) as a basis and intends to extends them with LOTAR manifest files [17] that hold, for example, information such as model usage, validity ranges, represented and neglected phenomena.…”