1.2.1. Experimental Modal Analysis By
block#
The previous tutorial tutoEMA
has focused on the identification of
SIMO or MIMO transfers.
For some test cases, it is necessary to perform several identification by blocks because pole shifts are expected between these blocks.
Here are examples of typical parameters defining the blocks :
Temperature
Input location
Input level
Sensor batches
Pre-loading
...
SDT provides tools to easily navigate between blocks, perfom the identification for each block and finally post-treat the result (pole tracking, clustering, main shape extraction,...)
The following tutorial highlights the procedure identify parametric
transfers on the DemoGartBy
example in which each block of transfers
depends on the temperature.
Step 1 : Load wireframe and parametric transfers#
:::{dropdown} Run step . Expand to display source code.
[XF,wire]=demosdt('DemoGartBy');
[ci,cf]=iicom('dockid',struct('model',wire,'XF',XF));
::: Load the curve containing all the measurement blocks and eventually the wireframe.
Store them in the dock Id with the command
% Example of measurement blocks with GARTEUR
[XF,wire]=demosdt('DemoGartBy');
% Open dock with measurement blocks in curve 'Test'
[ci,cf]=iicom('dockid',struct('model',wire,'XF',XF));
:::{figure} ../_images/TutoBy_1.png :width: 100% :name: TutoBy_1 :::
Step 2 : Switch to By mode#
:::{dropdown} Run step . Expand to display source code.
% Simulate click on button "Init By Mode"
iicom(ci,'SetIdent',struct('ByMode','do'))
:::
To initialize the identification by block, on tab Ident
, expand
IDopt
and click on Init By Mode
.
:::{figure} ../_images/TutoBy_2a.png
:width: 50%
:name: TutoBy_2a
:::
In the Ident
tab, a block of buttons By
has appeared.
:::{figure} ../_images/TutoBy_2b.png
:width: 50%
:name: TutoBy_2b
:::
These button help in the navigation between block through all the
procedure of identification by blocks. All the blocks are listed in the
pop button on the top right (here 11 temperatures). You can increase or
decrease the selected block by clicking on the + or - buttons or directly
selecting the wanted one in the list. When one block is selected,
measurement corresponding to this block only is stored in the curve Test
and eventually previous identification results.