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{{Short description|Computer simulation interface}}
{{Infobox standardref
| title
| status
| year_started
| version
| url=https://fmi-standard.org/docs/3.0.2/
| title=FMI Specification 3.0
| publisher=github.com/modelica
| date=2024-11-27
| accessdate=2024-12-25}}</ref>
| version_date = {{Start date and age|2024|11|27}}
| organization = [https://modelica.org/association/ Modelica Association Project (MAP)]
| base_standards =
| related_standards = [[Co-simulation]]
| abbreviation = FMI
| ___domain = [[Computer simulation]]
| license = [[Creative Commons licenses|CC BY-SA-4.0]]
| website = [https://fmi-standard.org/ FMI website]
}}
The '''
The vision of
To create the FMI standard, a large number of software companies and research centers have worked in a cooperation project established through a European consortium that
The FMI Standard provides three interface types for different aspects of models:
* FMI for model exchange,
* FMI for [[co
* FMI for
In practice, the FMI implementation by a software modelling tool enables the creation of a simulation model that can be interconnected or the creation of a software library called FMU (Functional Mock-up Unit).<ref name="modelica_Jan10">{{cite web| url=https://www.modelica.org/publications/newsletters/2010-1/index_html#item8| title=Functional Mockup Interface (FMI)| publisher=modelica.org| date=January 2010| quote=''On Jan. 26, version 1.0 of the open Functional Mockup Interface was released (FMI for model exchange 1.0). This interface was developed in the ITEA2 MODELISAR project to support the model exchange between modelling and simulation tools. The Modelisar project is coordinated by Dassault Systèmes. The FMI development has been organized by Daimler.''| accessdate=2011-12-22}}</ref>
== The FMI approach ==
The typical FMI approach is described in the following stages:
* a modelling environment describes a product sub
* as an alternative, an engineering tool defines the controller code for controlling a vehicle system
* such tools generate and export the component in an FMU (Functional Mock-up Unit);
* an FMU can then be imported in another environment to be executed;
* several FMUs can – by this way – cooperate at runtime through a co-simulation environment, thanks to the FMI definitions of their interfaces.
==License==
The [https://www.fmi-standard.org/downloads FMI specifications] are distributed under open source licenses:
* the specifications are licensed under CC BY-SA (Creative Commons Attribution-Sharealike 4.0) [[Creative Commons licenses|CC BY-SA 4.0]]
* the C-header and XML-schema files that accompany this document are available under the [http://www.opensource.org/licenses/bsd-license.html BSD] license with the extension that modifications must also be provided under the BSD license.
==Architecture==
Each FMU (
* an XML file containing among other things the definition of the variables used by the FMU;
* all the equations used by the model (defined as a set of [[C (programming language)|C]] functions);
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==Example==
<
<?xml version="1.0" encoding="UTF8"?>
<fmiModelDescription
fmiVersion="1.0"
modelName="ModelicaExample"
modelIdentifier="ModelicaExample_Friction">
...
<UnitDefinitions>
Line 88 ⟶ 82:
</ModelVariables>
</fmiModelDescription>
</syntaxhighlight>
==Comparison to Simulink S-Functions==
FMI is often compared to [[Simulink]] S-Functions since both technologies can be used to integrate third-party tools together. S-Functions are used to specify a computer language description of a dynamic system. They are compiled as MEX-files that are dynamically linked into [[MATLAB]] when needed. S-Functions use a calling syntax that interacts with Simulink’s equation solvers. This interaction is similar to the interaction that takes place between built-in Simulink blocks and the solvers.<ref>{{cite web
| url=http://
| title=Using Simulink S-Functions with Finite Difference Method Applied for Heat Exchangers
|author1=Stepan Ozana |author2=Martin Pies | work=Proceedings of the 13th WSEAS International Conference on SYSTEMS)
| accessdate=2015-08-05}}</ref>
FMI proponents explain that FMI models have several advantages over Simulink S-Functions:<ref>{{cite web|url=http://synchronics.inria.fr/lib/exe/fetch.php/modelica-fmi-elmqvist.pdf |title=Functional Mockup Interface – Overview |author1=Martin Otter |author2=Hilding Elmqvist |author3=Torsten Blochwitz |author4=Jakob Mauss |author5=Andreas Junghanns |author6=Hans Olsson |work=synchronics.inria.fr |publisher=[[National Institute for Research in Computer Science and Control|INRIA]] |accessdate=2011-01-23 |url-status=dead |archiveurl=https://web.archive.org/web/20110720233637/http://synchronics.inria.fr/lib/exe/fetch.php/modelica-fmi-elmqvist.pdf |archivedate=July 20, 2011 }}</ref>
* S-Functions format is proprietary, whereas the FMI schema is licensed under a [[BSD licenses|BSD license]].
* The building blocks of S-Functions are much more complex than FMI, making it very difficult to integrate in simulators other than
* Furthermore, the S-Functions format is specific to Simulink.
* S-Functions are not suited for [[embedded system]]s, due to the memory overhead of S-Functions.
{{Infobox standardref
| title = System Structure and Parameterization
| status = Published
| version = 2.0<ref>{{cite web
| url=https://ssp-standard.org/docs/2.0/
| title=SSP Specification 2.0
| date=2024-12-20}}</ref>
| organization = [https://modelica.org/association/ Modelica Association Project (MAP)]
| base_standards =
| related_standards = [[Co-simulation]]
| abbreviation = SSP
| license = [[Creative Commons licenses|CC BY-SA-4.0]]
| website = [http://ssp-standard.org/ SSP website]
}}
== System Structure and Parameterization (SSP) ==
[[System Structure and Parameterization]] ('''SSP''')<ref name="ssp-standard">{{cite web
| title = SSP Standard Webpage
| publisher = Modelica Association Project SSP
| date = 2023
| url = https://ssp-standard.org/
|access-date=2023-05-11
}}</ref> is a companion standard to FMI that defines a standardized, open file format to describe complex, hierarchical (technical) systems, that can be simulated. An SSP file contains definitions for system
architecture, the interfaces of the system elements, and their connections and parameterization.
The aim of SSP is to simplify the exchange and integration of system elements that are used in the
distributed development of a system to be simulated using a wide variety of tools.
<ref name="Hallqvist2021">{{cite web
| title = Engineering Domain Interoperability Using the System Structureand Parameterization (SSP) Standard
| publisher = Proc. 14th Modelica Conference
| date = 2021
| url = https://ecp.ep.liu.se/index.php/modelica/article/view/180/140
| doi = 10.3384/ecp2118137
| last1 = Hällqvist
| first1 = Robert
| last2 = Munjulury
| first2 = Raghu Chaitanya
| last3 = Braun
| first3 = Robert
| last4 = Eek
| first4 = Magnus
| last5 = Krus
| first5 = Petter }}</ref>
SSP is being developed as a project of the Modelica Association and is based
on the FMI specification. FMI enables the exchange of individual simulation
components, while SSP enables the exchange of complete simulation systems, their variants and
parameterization. The simulation components of a simulation system described in SSP can also be
independent of FMI and map to other implementations.
SSP is extensible to support specific requirements or ___domain-specific extensions: e.g. OSI, documentation of requirements, traceability or process steps, etc. SSP is open with regard to the component formats. Although it was based on FMI, it can also be used with components specifications of any other format.
== Accompanying standards and recommendations ==
In May 2014, the project group Smart Systems Engineering (SmartSE) of the [[ProSTEP iViP]] Association published its Recommendation PSI 11 for the cross-company behavior model exchange.<ref>[http://www.prostep.org/en/medialibrary/publications/recommendations-standards.html#c1077 ProSTEP iViP Recommendation PSI 11, Smart Systems Engineering, Behavior Model Exchange, V 1.0], May 2014.</ref> FMI thereby is the technological basis. The PSI 11 specifies interaction scenarios, use cases, a reference process and templates, which thereby could ease the industrial application. End of 2016 the group published a movie, which should highlight the industrial benefits.<ref>[https://www.youtube.com/watch?v=A-3iIot0fO8&t=52s Benefits of utilizing FMI for realizing cross-company Systems Engineering], Status February 2017</ref>
==See also==
* [[20-sim]]
* [[Modelica]]
* [[Simulink]]
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==External links==
* [http://functional-mockup-interface.org/ FMI main site]
* [http://ssp-standard.org/ SSP main site]
[[Category:Simulation software]]
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