Integration of the input function (Integrator wrapper block).
The Integrator-Wrapper
Block
Parameters:
| quantum |
output quantisation degree |
| startX |
initial start value (initial condition) |
Description:
Actually, the library contains three different Integrator blocks --
one for each type of QSS. The reason for not having merged them
into a single block is that they heavily differ from each other, so
putting them together would have led to a block the code of which
would have become very complex and thus uncomfortable to
read.
However, in order to still be able to exploit the functionality of
the WorldModel block (switching between different types of QSS),
there is an "integrator-wrapper" component that features the same
ports and parameters as an Integrator does, but has an additional
parameter to choose between the QSS1, QSS2 or QSS3 Integrator. The
internal structure of the model looks as follows: all three types
of Integrator blocks are present, and each of them has its port
connected to the corresponding port of the wrapper component. Their
instantiation however depends on the value of the method parameter
(i.e. world.qss). See the code snippet below for an illustration:
1 block Integrator
2 extends ModelicaDEVS.Interfaces.DDBlockIntegratorMulti;
3 parameter Real quantum= 0.1 "Quantum";
4 parameter Real startX=0 "Start Value of x";
5
6 IntegratorQSS1 IntegratorQSS1_1(quantum=quantum,startX=startX) if method == 1;
7 IntegratorQSS2 IntegratorQSS2_1(quantum=quantum,startX=startX) if method == 2;
8 IntegratorQSS3 IntegratorQSS3_1(quantum=quantum,startX=startX) if method == 3;
If method takes a value of 1, only the QSS1 Integrator is
instantiated (line 6), if method equals 2, only the QSS2 Integrator
is instantiated (line 7), and the same holds for a method value of
3 (line 8). It is implied that connections leading to a block are
only instantiated if the block itself has been instantiated.
As stated before, the integrator wrapper block has the same
parameters (quantum and startX) as a real Integrator (lines 3 and
4). This circumstance allows the wrapper to initialise the
instantiated Integrator block with the appropriate parameter
values. It is not very illustrative an example, given that the
parameters of a specific Integrator and the integrator wrapper
block have the same names, and thus the parameter initialisation
unfortunately results in an instruction like quantum=quantum and
startX=startX. Nevertheless, it should be understandable how
parameter propagation within a model works.
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.ModelicaDEVS.FunctionBlocks.Integrator