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Add-on library BG V.2.1 for graphical programming of
Bondgraphs by means of Simulink
- all rights reserved - Dr. Geitner ETI/TU Dresden |
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Download of last version
BG V.2.1
inclusive examples and documentation.
Download of previous versions.
Lists of examples:
Summary of block icon, functionality and block mask as well as
parameter input in a list.
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BG V.2.1 - available documentations:
- Verbale
description
of elements (blocks) and feasible adjustments (block mask menu)
- Tabulated summary of the element (block)
features
- Tabulated summary of the element (block)
dialog box parameters
- Listed
application hints
regarding BG V.2.1 as a Bondgraph block library using Simulink
- Internal
measurement
of effort and flow in Simulink Bondgraphs
- Prepared
appearance forms
of node blocks in Simulink Bondgraphs
- Handling of a
special case
of the node block connectons in Simulink Bondgraphs
- Examples
introduction and
mechatronics
(Bondgraph and Simulink Bondgraph representation)
- Summary of the
specifics
of some examples regarding the Simulink block library
Examples "Mechatronics" including specification of numbers and pages with kind authorization refer
to: Scherf, H. E. "Modellierung und Simulation dynamischer Systeme", Oldenbourg Verlag, 2003.
Realization independent approaches for state control structures offers: Zäh, M.; Brandenburg,
G. "Das erweiterte Dämpfungsoptimum", Automatisierungstechnik (at) Bd. 35 (1987) H.7, S. 275/83.
Suggestions regarding the Kelvin-Voigt-Element and the modeling of a belt conveyor contains:
Drüßner, U. “Development of Real-Time Minimal Models for Belt Conveyor Systems”, in
Proceedings of the 2004 International Power Electronics and Motion Control Conference (EPE-PEMC),
CD: A77441.
Some examples refer to a comparison to likewise power flow oriented modeling methods "Power Oriented Graph
(POG)" by R. Zanasi (Modena / Italy) and "Energetic Macroscopic Representation (EMR)" by A. Bouscayrol
(Lille / France) - see International Workshop "Modelling and control of electrical systems
(MCES)", Lille, Nov. 13./14. 2006.
Parameterisation
Please note the correct input of parameters regarding the units and the positioning of the parameter
within the underlying equation. Please do not use unit prefixes as a basic principle. The product of
effort and flow must be a power value for each bond connection and in each energy domain.
Parameter input possibilities:
- The easiest possibility is the input of constant numerical values within a block mask.
Depending on the context of the considered Bondgraph part the input has to be a scalar,
vector or matrix.
Hint:
This mask input will be always directly accessible independently of the button "Block
function tunable".
- An other possibility is the input of a symbolic parameter at the respective block mask
plus the definition of a m-file of the same name like the simulink project containing the
Bondgraph (*.mdl) AND name extension "_P" [example: SM_BG_01.mdl and SM_BG_01_P.m].
This m-file has to realize assignment or computation of numerical values
to symbolic parameters. Opening the simulink project causes automatic parameter loading in
this case. Please note version BG V.2.1 does not clear variables.
Hint:
To share the same m-file of parameter definition for several Bondgraphs primary open those
simulink project (mdl-file) of same name even if it will not be used then - compare DC
machine examples.
- The third possibility concerns variable parameters. Switching to this mode causes one or two
additional block inputs. The necessary paramater computation has to be done by a user defined
subsystem - compare example lift magnet.
Hint:
Non-linear parameter computation is typically dependent on directly accessible values for
momentum and displacement (additionally outputs of energy storages) as well as on measured
values for effort and flow (use of blocks AB as "activated bonds").