ModelicaDymola - PowerPoint PPT Presentation

Title: ModelicaDymola


1
SystemDesign

• Modelica/Dymola
• a multidomain modelling and simulation
  environment for fuel cells?

2
Challenge

• easy to use models for several purposes (concept
  studies, design, optimisation, control design,
  HIL-Simulation, customer consulting, life cycle
  cost analysis, ..)
• various time scales and granularity of modules
• scales of dynamic behaviour (balance between
  details and speed)
• hybrid process (continuous and discreet)
• reuse and exchange of existing models
• model sharing

3
Benefits

• better understanding of behaviour and processes
  (complete analysis capabilities)
• faster design and evaluation of new concepts
• evaluation of critical states and limits
• multi-domain system integration
• multi-level simulation (same component
  different views)
• model exchange and modelling network

4
Multidomain Modelling
Multidomain-Model
Specialised Tools Interfaces
Modelling by Uniform Language
Equations
Multiports
Blocks
System Dynamics
Excel Matlab ACSL
Simulink
STELLA BerkeleyMadonna Powersim Vensim
Modelica VHDL-AMS
5
System Dynamics vs. Signal Flow Modelling

• Example
• mass of the incoming freight car 60 t
• mass of the resting freight car 30 t
• velocity 3 m/s
• four buffers with spring and friction (105 mm,
  30 kN, 600 kN, 200 kN)
• brakes not applied

6
System Dynamics
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Signal Flow (Simulink)
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Physics of Dynamical Systems

• area quantity potential
• gravitation mass gravitational
• hydraulics volume pressure
• mechanics
• translational momentum velocity
• rotational angular moment. angular velocity
• thermodynamics entropy temperature
• electricity charge electrical
• chemistry am. of substance chemical

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dynamic systems
information energy momentum, angular
momentum electric charge entropy mass, amount
of substance
exchange of
system states processes
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Multiport Modelling
System equations states
thermal connection (temperature, heat)
mechanical connection (v, p w, L p, V)
electrical connection (U, Q)
1/s
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Hierarchical Aggregation
Structured process model
hierarchical aggregation
Idee und Schaubild von R. Hanke, M. Mangold
und K. Sundmacher Max-Planck-Institut für Dynamik
komplexer Systeme Magdeburg
Storage level library
Virtual fuel cell lab
12
VHDL-AMS vs. Modelica resistor
model Resistor einfacher Widerstand pin p,
n parameter SI.Resistance R 5 protected
SI.Voltage v equation v p.v n.v p.i
n.i 0 v Rp.i end Resistor connector
pin SI.Voltage v flow SI.Current i end pin

• entity Resistor is
• port (terminal p, n electrical)
• generic (R REAL 5)
• end Resistor
• architecture R1 of Resistor is
• quantity vR across iR through p to n
• begin
• vR RiR
• end R1
• nature electrical is
• voltage across
• current through

13

• object orientated modelling language
• hierarchically structured
• support effective library development and model
  exchange
• non causal modelling (differential, algebraic and
  discrete equation)
• for multi domain modelling (hydraulics,
  mechanics, electronic, thermodynamics, control
  engineering, )
• open source (www.modelica.org)

14
Dymola
15
Related Tools

• Dymola-Simulink Interface
• A Modelica model can be converted into a
  S-function block
• IDA indoor climate and energy from Equa
• Equa is working towards making IDA Simulation
  Environment fully Modelica compatible

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Examples

• HIL-Simulation of the Hydraulcs and Mechanics of
  on Automatic Gearbox (BMW)
• Modelica Application for Camless Engine
  Valvetrain Development (Ford)
• Modeling und Simulation of Refrigeration Systems
  with the Natural Refrigerant CO2 (Airbus)
• Simulation of Thermal Building Behaviour in
  Modelica (Uni Kaiserslautern)
• Modeling of Hybrid Electric Vehicles in Modelica
  for Virtual Prototyping (Uni Gothenburg)
• The Modelica Flight Dynamics Library (DLR)

17
KTI-Projek Nr. 6225.1

• Auflaufsimulation von Personen- und Güterzügen
• Ziel Modelica-Bibliothek zur Optimierung von
  Kupp-lungsvorgängen, Analyse des
  Schwingungsverhaltens und Beurteilung der
  Kollisionssicherheit
• Umfang
• KTI-Beitrag 200000.-
• Eigenleistung Schwab AG 260000.-
• Eigenleistung LEC 20000.-
• Cash Schwab AG 20000.-