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FMI (Functional Mock-up Interface) is a free and open standard for exchanging dynamic simulation models, maintained by the Modelica Association Project FMI. It defines the FMU container and interface: models are distributed as ZIP packages that combine XML, binaries, and C code. Its goal is to simplify the creation, storage, exchange, and reuse of models across different simulation systems, covering scenarios such as model/software/hardware-in-the-loop simulation, cyber-physical systems, and digital twins.
FMI supports Model Exchange, Co-Simulation, and Scheduled Execution introduced in FMI 3.0. Enhancements in 3.0 include Clocks, array variables, additional numeric types, binary data types, Source Code FMUs, Terminals and Icons, an extra directory, and the Layered Standards extension mechanism, making it better suited for control code, vECUs, and complex system integration. The standard emphasizes neutrality across tools, technologies, and programming languages. Although it is maintained by the Modelica Association, it is not technically dependent on Modelica. In terms of ecosystem, the main materials mention support from 280+ tools and list many industrial and research members, including Bosch, Siemens, Dassault Systèmes, dSPACE, MathWorks, Ansys, Airbus, and Volkswagen, indicating strong industry recognition.
The FMI standard is free to access and use. The specification documents are licensed under CC-BY-SA 4.0, while code provided with the specification, such as C header files and XML Schema files, uses the 2-Clause BSD License. However, commercial tool vendors may charge for FMI import/export functionality. The documentation is fairly comprehensive, offering specifications for multiple versions, a Complete Package, Implementers' Guide, FAQ, Cheatsheet, Jupyter/Colab/Binder getting-started materials, Reference FMUs, and GitHub repositories, making it suitable for implementers to develop, test, and debug their integrations.
Its strengths are that it is open and free, has clear licensing, mature governance, and a strong cross-tool ecosystem. It is well suited to automotive, aerospace, industrial control, multidisciplinary simulation, and digital twin teams that need model exchange and co-simulation. The downsides are that FMI itself is not an out-of-the-box product, and real-world adoption depends on the implementation quality of specific simulation tools. Contributing to the standard requires an organization to sign a CCLA/CLA, which makes the process relatively formal. FMI 2.0 also does not support exposing explicit solvers for PDEs.
The source material does not provide information on access from China, payment, or mirrors, so its accessibility status is marked as unknown. Since its core resources include the official website, GitHub, Google Colab/Binder, and similar services, the actual experience in mainland China may be affected by local network conditions. Related alternative or complementary standards include SSP, DCP, and ASAM XIL-MA. If the focus is on specific simulation platforms, users should evaluate them together with locally available commercial or open-source simulation tools.
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