Software for Multidisciplinary System
Software based on this approach allows for submitting dynamic models of real systems in a form
the topology of which is similar to the topology of the modelled real systems.
Thus the models can be set up based on mere inspection of the real system configuration
without forming any eqautions, block diagrams, of bond graphs. The underlying equations are formed
automatically based on constitutive relations of the system components component and on the
physical laws governing the component interactions. As this approach was first developed in
the electrical-engineering area, it has been also called terminal
. Later, some software-engineering oriented people started to call it the
- Introduced by Analogy, Beaverton OR, in 1987
This is definitly the most advanced software in the field of multidisciplinary modeling and simulation.
First developed for powerful workstations, later became available also for PC computers. Saber uses the
mixed-signal hardware description simulation language MAST, a predecessor of the IEEE standard 1076.1,
or VHDL-AMS. Academic users complain about the enormous cost and a steep learning curve of this
Dynast - DYN, Prague
A predecessor of Dynast, developed at the end of seventies at the Czech Technical University in Prague,
admits system models characterized
by a set of algebro-differential equations, by a block diagram, by
a physical model in the form of a multipole diagram or by a combination
of the above approaches. The multipole diagrams allow for portraying the
actual physical structure of the modeled real systems without deriving
any equations or constructing any graphs. Block and multipole diagrams
can be submitted to DYNAST in a graphical form using a web-based Java applet
or a more sophisticated OrCAD schematic capture editor.
Dymola - Dynasim AB, Lund
Dymola provides an object oriented modeling
using Modelica language. Dymola allows for graphical model composition
from library models, continuous/discret simulation and 3D animation.
Bond graph methodology can be used. Model details are given by ordinary
differential and algebraic equations, also in a matrix form. Dymola
converts the differential-algebraic system of equations symbolically to
state-space form if possible. Graph-theoretical algorithms are used to
determine which variable to solve for in each equation and to find minimal
systems of equations (optionally using tearing) that have to be solved
simultaneously (algebraic loops). The equations are then, if possible,
solved symbolically. Linear systems of equations can be solved symbolically
or numerically. Dymola also supports instantaneous and discontinuous
20-sim - CLP, University of Twente
20-sim uses modeling through iconic diagrams, block diagrams, bond graphs
and equations. Fully observable, unlimited hierarchical model structure.
Active support of top-down, inside-out and bottom-up modeling. Open component
model libraries. Support of vectors and matrices, as well as multi-dimensional
bonds and signals. Export of data and models to Matlab. Built-in runtime
compiler. Parameter Optimization, ANSI-C Code Generation, Linearization,
Graph Animation and 3D Animation toolboxes. (demo)
HYBRSIM is an implementation of a hybrid
bond graph modeling and simulation. It embodies a set of physical principles
that govern discontinuous changes in physical system models which violate
the continuity of power constraint and at times instantaneous energy losses
may occur. (Java source files available)
Simulink - MathWorks, Natick, MA
Simulink provides an interactive, block-diagram simulation environment.
It includes a library of
linear, nonlinear, continuous-time, discrete-time, multirate, conditionally
executed, and hybrid blocks. Blocks can be grouped into hierarchies to
create a simplified view of subsystems. Simulink allows customization with
regard to incorporating user C code.
Simulink solvers support differential algebraic equations (DAEs) with
algebraic loops. The solvers also support stiff systems, systems with algebraic
loops, and systems with state events.
Simulink includes many features for linearization,
equilibrium point determination, animation, parameter optimization,
and parametric analysis.
With integration to MATLAB, Simulink offers immediate access to a
range of other analysis and design tools.
ACSL - AEgis Research
ACSL (Advanced Continuous Simulation Language) is a simulation and
modeling environment with several components. A visual programming
tool facilitates building ACSL models
in the form of object-oriented graphical block diagrams.
A mathematical analysis package provides
visualization and analysis of simulation data.
An optimizer allows for the estimation
and optimization of critical parameters in simulations.
A modeling environment generates
C code from specific portions of models.
A real-time set of software and hardware allows
to synchronize simulations to a real time clock.
A visualization package facilitates building dynamic
animations from simulations.
An open applicaiton program interface (API)
allows to build custom user interfaces to access
Easy5 - Boening Co., Seattle, WA
EASY5 software is used to model and simulate dynamic systems with continuous and digital subsystems.
Systems are quickly modeled with functional blocks and/or with predefined blocks representing system
components, as well as user-defined FORTRAN or C. Virtual
prototypes of entire systems can be constructed via links to other CAE software.
Source code is automatically generated to support real-time simulation.
VisSim - Visual Solutions, Westford, MA
VisSim executes MATLAB commands, functions and .m files.
An extension of the MS C/C++ compiler for integrating user-developed
programs into custom blocks. Create alphanumeric text strings that
VisSim displays upon the occurrence of a conditional event.
Real-time data interface.
Maple - Waterloo Maple, Waterloo, Canada
Maple an interactive computer algebra system that provides a
mathematical environment for the manipulation of symbolic algebraic
expressions, arbitrary-precision numerics, both two-dimensional and
three-dimensional graphics, and programming.
Mathematica - Wolfram Research, Champaign, IL
Mathematica is an integrated computing system, combining interactive
calculation (both numeric and symbolic), visualization tools, and a
programming environment. Mathematica can perform symbolic calculations
in algebra, calculus, differential equations, and higher mathematics.
Mathematica also has a communications protocol which allows it to
communicate and share data with other programs.
It can also communicate between networked Mathematica processes.
VHDL tools and models
SPICE to VHDL-AMS translator