Statechart Designer of LMS Imagine.Lab Amesim: combine discrete-event control and continuous system model

Statechart Designer
Combine discrete-event control and
continuous system model
Realize innovation.Unrestricted © Siemens AG 2016
LMS Imagine.Lab Amesim™
A world leading platform for physical
simulation of mechatronic systems

Unrestricted © Siemens AG 2016
November 17, 2016Page 2 Siemens PLM Software
Simcenter™ Portfolio for Predictive Engineering Analytics
LMS Imagine.Lab
LMS Imagine.Lab Amesim
Collaboration &
workflow

Table of content
• Overview of the LMS Statechart Designer
• Statechart Designer in details
• Applications for Automotive and transportation
• Applications for Aerospace and defense
• Applications for Heavy equipment
• Applications for Marine
• Going further

Introduction to state machines
• What is a Finite State Machine (FSM)? It is a representation of an event-driven system or abstract
machine. In an event-driven system, the system makes a transition from one state (mode) to another, if
the condition (triggering event) defining the change is true. It can be in only one of a finite number of
states. A FSM is defined by a list of its states, and the triggering condition for each transition.
State Diagram - Directed Graph State Transition Table – Truth Table – Characteristics Table
• What is a Statechart?
A statechart contains sequential decision logic which can graphically represent a finite state machine.
A turnstile

Statechart Designer: overview
Avoid creating controls based on complex assemblies of
mathematical and logic signal components
• Prototype controllers’ architecture and logic within LMS Amesim
• Drive LMS Amesim models behavior by the triggering of events  define maneuvers and mission profiles
• Get rid of these error-prone design methods:
Signal assembly
LMS Amesim
Specific Ameset submodel
LMS Ameset
Avoid writing C code to encapsulate it in a specific LMS
Ameset submodel

Statechart Designer in LMS Amesim: overview
• Provide quick & easy way of defining, simulating
and analyzing State machines in LMS Amesim
thanks to the fully integrated Statechart
Designer tool and dedicated Graphical User
Interface
• Take advantage of the formal basis for state
machine definition and execution (Harel
statecharts formalism) for upfront validation of
logic
• Connect seamlessly to LMS Amesim models.
The statechart component is part of the sketch
that contains the modelling of the system.
Statechart Designer user interface
Statechart component
LMS Amesim

Statechart Designer: few examples of statechart use cases for various
industries

Table of content
• Going further

Statechart Designer: create statechart
• Drag and drop statechart primitives from a toolbox into the graphical editor
• Create transitions in between states by drawing arrows from the start state to the end state
Statechart
primitives
Toolbox
Initial state State / Substate Composite state History state Entry point Exit point

Statechart Designer: create statechart
• Reduce complex chart to a set of simpler, hierarchically organized diagrams using
composite states and parallel states
Composite state Parallel state
• A composite state is a state
containing other states, input
and output ports
• A parallel state is a special
composite state distributing
activity in several composite
sub states. Each parallel
branch has active states in
the same time.

Statechart Designer: execute and analyze statechart
Highlight activated states, raised events, and taken transition path
• Once the logic of the statechart is validated, you can run simulation and view its behavior to test its
integration with the physical model of the system.
• Several post-processing tools are available for deep analysis.
View data evolutions within the LMS Amesim plot

• Thanks to a shared timeline between post-processing tools, the instant of state activation can be viewed in
the Dashboard, the 3D Animation and the Plots.
Synchronized animation of post-processing tools
3D Animation
DashboardStatechart
Plot

• Change inputs of a statechart during simulation thanks to the interactive control from the Dashboard
• View the states highlighting synchronized with the changes
Input association with primitive properties in Dashboard Dynamic input change and statechart animation

Statechart Designer: others GUI capabilities
Text edition on diagramTransition reconnectionDedicated data interface
Validation test before running simulation Error highlighting State change by state change animation

Table of content
• Going further

Application #1: control validation of an automotive power window system
Visualize the flow changes in your Statechart thanks to the post-processing tools
synchronization
Associate the
dynamic input
change to the
state properties
of the control
primitives
LMS Amesim

Application #2: parallel hybrid vehicle with statecharts
Synchronized with the Dashboard
LMS Amesim
Hybrid supervisor: requests sent to the Internal
Combustion Engine (ICE), Electric Motor (EM) and
the brakes
Gearbox control:
gear ratio request
from the driver or
automatic gearshift
in 4 different modes
Controllers for subsystems & sequence of maneuvers
designed with statecharts

Application #2: maneuvers sequence using statecharts
Tip-in / Tip-out
The maneuver applies a throttle
request to the vehicle
LMS Amesim
There are 3 types of transitory
part (sinus, ramp, step) for the
maneuver

Application #3: diesel common rail injector
LMS Amesim
provides a
powerful
heterogeneous
simulation
platform to
integrate
subsystems from
various sources:
C, Modelica,
Statechart, FMI,
...
LMS Amesim
LMS Amesim
Leverage LMS Amesim tools to analyze, visualize, explore
and understand the system

Application #3: diesel injection system
Heterogeneous simulation
LMS Amesim

LMS Amesim

Table of content
• Going further

Application #1: fuel management system
A Dashboard shows the ECAM fuel page
(Electronic Centralized Aircraft Monitor)
allowing to visualize the fuel quantities and
temperature in each tank
LMS Amesim
3D shapes of the tanks including center of
gravity and free surface position in each
tank

Application #2: pressure differential transfer
Refueling Transfer
LMS Amesim

Application #3: longitudinal flight - fuel consumption
To switch from one
autopilot to
another, a state
machine is used
The flight phase
triggers the
transition from one
autopilot to
another
LMS Amesim
LMS Amesim

Table of content
• Going further

Application #1: hydrostatic transmission tractor
Controls the clutches
engagements and the pump
displacements of a
hydrostatic transmission
with a Statechart logic
Output variables assignments and transitions
expressions are visible directly on the diagramLMS Amesim
Driving speed
Motorangle

Application #1: hydrostatic transmission tractor
The transmission of the power in the
system can be checked depending on
which clutch is engaged
Note the losses in the hydraulic units due to the efficiencies and the mechanical dissipation in the
gears and clutches
LMS Amesim

Application #2: analyze the systems behaviors of a tractor
With the replay mode and the synchronization capability, visualize the
response of your system on all the post-processing tools
LMS Amesim

Table of content
• Going further

Model of tanker
LMS Amesimship resistance
diesel engine
propeller
Application: mission profile of a tanker to follow a specific path
1. Acceleration to max speed for a displacement of 50 km
2. Stay in max speed for a displacement of 30 km
3. Stop the engine until the boat stops
Dashboard to view instantaneous results

Table of content
• Going further

Statechart user guide in LMS Amehelp

Scientific paper with LMS Amesim Statechart - 2014
https://www.modelica.org/events/modelica2014/proceedings/html/submissions/ECP140961237_
FuricWagnerBerthoux.pdf

Statechart formalism by David Harel - 1986
http://www.inf.ed.ac.uk/teaching/courses/seoc/2005_2006/
resources/statecharts.pdf

LMS Amesim enables you to tailor your platform to your specific needs with the App
designer, Plots Python API, application-specific tools for pre-processing and post-
processing as well as customized parameter editing using external executables.
Use advanced LMS Amesim scripting tools for model interaction automation and LMS
Amesim APIs for full command-line building of complete models.
LMS Amesim helps improve your system design with LMS Amesim Design Exploration,
LMS Amesim Export module or the LMS Amesim-Optimus interface.
LMS Amesim enables you to analyze your data and system results with advanced
plotting facilities, dashboard, animation, table editor, linear analysis, activity index and
replay.
LMS Imagine.Lab Amesim comes with unique usability and scalability capabilities with
all the LMS Amesim graphical user interfaces (GUI), interactive help and associated
features such as the supercomponent facility, batch run monitor, experiment manager,
postprocessed variables and Statechart designer.
More about the LMS Imagine.Lab Amesim platform
Platform
facilities
Analysis
tools
Optimization, robustness, design of
experiments
Simulator scripting
Customization

LMS Imagine.Lab Amesim supports Modelica, the open standard language for
describing physical systems. The Modelica platform provides the tools you need to
build acausal, multidomain Modelica models and leverage the LMS Amesim platform
features to analyze the resulting system.
LMS Amesim can be coupled with external software applications such as CAE, CAD,
CAM, FEA/FEM and computational fluid dynamics (CFD). Co-simulation provides
coupling between LMS Amesim and CAE tools with predefined setups to ensure good
dialog between the tools and simulation software.
LMS Amesim provides co-simulation capabilities with any software coupled with LMS
Amesim due to the generic co-simulation capability and functional mock-up interface
(FMI), to complete heterogeneous simulations within an unique integration platform.
The LMS Amesim unique integrated platform provides realistic plant models for every
stage of the development cycle, enabling system and control engineers to start
evaluation and validation phases early in the design cycle using model-in-the-loop
(MiL), software-in-the-loop (SiL) and hardware-in-the-loop (HiL) frameworks.
LMS Amesim integrates cutting-edge numerical methods, performance analyzer,
discrete partitioning library for CPU speed-up, a parallel processing feature for
multiprocessor task distribution as well as High Performance Computing (HPC).
More about the LMS Imagine.Lab Amesim platform
Solvers
and numerics
MIL/SIL/HIL
and real-time
Software
interfaces
1D/3D
CAE
Modelica
platform

Contact
Jérôme GUILLEMIN & Stéphane NEYRAT
LMS Amesim Platform
Siemens Industry Software S.A.S.
Digital Factory Division
Product Lifecycle Management
Simulation & Test Solutions
DF PL STS CAE 1D
siemens.com

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