how to leverage the functional mock-up interface (fmi) for model based systems engineering (mbse) at...

Unrestricted © Siemens AG 2016 Realize innovation.

How to leverage the Functional Mock-up Interface

(FMI) for Model Based Systems Engineering

(MBSE) at all stages of product development LMS Imagine.Lab Amesim™ – Platform Product Management

Unrestricted © Siemens AG 2016

2016-01-14 Siemens PLM Software

The Functional Mock-up Interface (FMI)

• FMI Use Cases and Motivations

• What is a Functional Mock-up Unit (FMU)?

• The two FMI flavors

• Collaborative MBSE with LMS Amesim through FMI

• Application examples

• Siemens PLM Software:

a recognized FMI driver

• Perspectives



FMI Use Cases and Motivations

Use Cases to address:

• Collaborative MBSE:

• Between OEMs and suppliers

• Between departments of the same company

• Involving different domains and complexity levels

The solution is:

• Tool neutral software interface

• Open format, with publicly available specifications: https://www.fmi-standard.org/downloads

Many existing and future interfacing possibilities

Numerous suppliers…

1 OEM (system integrator)

1D, 3D FEA/MBS, CFD, Controls, RSM, Real-Time…



FMI Use Cases and Motivations

End-user motivations

• Standardized interfaces for sustainable tool chains

• Avoid de-facto proprietary middleware

Business Case for FMI is cost-effective

Simpler workflows & more direct tool chains

Motivations for LMS Amesim

• Reduce the number of interfaces

• Better integration of LMS Amesim

into existing SW environments

With FMI, you can select your most

convenient tool for result analysis,

for example LMS Amesim











• Perspectives



What is a Functional Mock-up Unit (FMU)?

An FMU usually is:

• A compiled version of a model with

predefined signal inputs and outputs

Reasonable confidentiality / IP protection

Independent from compilation aspects

or physical domains

An FMU can be:

• A “source code FMU”

Providing the model’s source code in

addition to required precompiled libraries

is useful for HiL applications

Several HW manufacturers support FMI to cover

all the MiL, SiL, HiL phases of the “V” diagram,

which maximizes reusability of FMUs

c files ( )

dll files

xml file











• Perspectives



1st FMI flavor: FMI for Model Exchange

FMI for Model Exchange:

Importing or Exporting models without solvers

Suitable for simple “low detail” or surrogate models

Often CPU efficient

Sometimes generates algebraic loops

To Amesim

1

2

1

2

From LMS Amesim



2nd FMI flavor: FMI for Co-Simulation

FMI for Co-Simulation:

Importing or Exporting models with native solvers

Robust & reliable results, high detail models

Protection against importing tool version changes

Allows for modular approaches (e.g. parallel multicore execution)

Stability / performance compromise to be managed

To Amesim

1

2

1

2

From

Amesim











• Perspectives



LMS Amesim as FMI importing/master platform

Importing 3rd party FMUs into LMS Amesim

• LMS Amesim as heterogeneous simulation platform:

• Use as many FMUs as desired

• Mix Model Exchange and Co-Simulation

• Benefit from each authoring tool's specificities

• Predict and analyze the multi-domain performance

of your complete system



LMS Amesim FMUs used in other FMI tools

Exporting LMS Amesim co-simulation FMUs into a 3rd party tool

• Embedded LMS Amesim know-how

• Plug LMS Amesim into any FMI tool

• Tune solver capabilities after import

• No model-solver adaptation needed

• Equivalent to running LMS Amesim

without GUI

• Compatibility

• LMS Amesim FMUs are pre-compiled for all

standard platforms

• IP protection

• No sensitive files are present

• Visibility level is tunable:

“white-”, “grey-” or “black-box” FMUs











• Perspectives



Application: ABS & ESC validation

FMU imported into complete vehicle model

ESC & ABS model with hydraulic circuit

1D 3D/MBS CFD Control

X

ME Import ME Export Cosim Master Cosim Slave

X X

MIL



Hydraulic part and imported controller

Application: Complete braking system

Coupled model (LMS Amesim + Simulink) exported as

an FMU for co-simulation

FMU imported into SIMPACK

Control logic of ESC system


X X X


X X

MIL SIL



Application: landing gear (aerospace domain)

FMU is generated with LMS Virtual.Lab Motion

FMU is imported into LMS Amesim


X X


X



Application: FMUs containing surrogate models

Use cases:

• Exporting surrogate models as FMUs (Real-

Time, controls validation, high-level vehicle

attributes, component sizing)

• Combining several “surrogate FMUs”

for CPU efficient system-level validation

(e.g. assemblies of multiple

response surfaces)

• No IP in surrogate models

• Numerous surrogate models

is still efficient

• Surrogate models are solver-friendly

(“FMI for Model Exchange”)

• Suitable for steady-state or low dynamics

• Not suitable for high dynamics

High detail model

Low detail model (e.g. Response Surface)

MIL SIL

HIL SIL



Functional Mock-up Interface (FMI)








• Perspectives



LMS Amesim Cross Check results

https://www.fmi-standard.org/tools

Cross-check passed for all FMI modes currently supported:

• LMS Amesim: 1st FMI 2.0 co-simulation master platform to have passed the cross-check

(LMS Amesim 15)



Publications and research activities

Various conference papers on FMI:

• 1D-3D coupling between

LMS Amesim and LMS

Virtual.Lab Motion.

Awarded best paper

at the 2013 JSAE annual

congress (Spring) [1]

• Research activity on advanced co-simulation:

• 10th Modelica Conference 2014’ [2]

• 2014 JSAE annual congress [3]

[1] Etele Erdelyi H., Viel A., Ogata Y.: Investigating the applicability of the FMI standard for co-simulation in

automotive application scenarios, JSAE Annual Congress, Yokohama, April 24, 2013.

[2] Viel A.: Implementing stabilized co-simulation of strongly coupled systems using the Functional Mock-up Interface 2.0,

10th International Modelica Conference, Lund, March 2014.

[3] Ogata Y., Loyer B., Viel A.: New trends and methods for the co-simulation of strongly coupled systems

using the Functional Mock-up Interface 2.0, JSAE Annual Congress, Yokohama, May 23, 2014.











• Perspectives



Perspectives for LMS Imagine.Lab Amesim

• Powerful, simulation platform combining the

strengths of “traditional” LMS Amesim with

increasingly important technologies like FMI and

Modelica

• User-friendly workflow to integrate these

subsystems into a single system model

• Solve the coupled system with robust numerical

algorithms

• Provide all the tools needed to analyze, visualize,

explore and understand the system



Take Away Messages

Siemens PLM Software:

• Promotes FMI as a reliable standard

• Is an active member of FMI Steering Committee and FMI Design group

• Has highly contributed to the specification of FMI 1.0 and FMI 2.0

• Remains the voice of its industrial customers for FMI evolutions, focusing on compatibility, simplicity,

reliability and neutrality

• Provides high-level support for the deployment of FMI

• Continues his research activity on advanced co-simulation



Dr. Bruno LOYER

LMS Amesim Platform – Product Manager

Siemens Industry Software S.A.S.

Digital Factory Division

Product Lifecycle Management

Simulation & Test Solutions

DF PL STS CAE 1D

Thank you!

Realize innovation.

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