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d_piezo

• Mesh
• MeshPlate
• MeshBaseAccel
• Tuto

Purpose

Support function for piezoelectric demos.

d_piezo contains a set of demonstration and meshing scripts. Use d_piezo to display tag list and see available content.

Mesh

In order to call a specific meshing script, use d_piezo('Mesh...',options), for example

MeshPlate

Meshing utilities for the placement of piezoelectric patches on a supporting structure (flat plate for now).

The options are specified in a structure with fields

• .list : defines a list of features to be introduced with columns giving name,LamSpec,Geo, name laminate specification and shape options.
• .unit : gives the model unit (needed since patch dimensions are always given in mm).

The laminate specification string is composed of the following

• BaseIdi gives the ProId of the base laminate which is then used to figure out the position of patches.
• +Patch or -Patch to place a patch above or below the base laminate.
• Patch itself is a specification of a patch material and geometry. The list of implemented patch can be obtained using m_piezo Patch
• .In to specify that the patch has an enforced voltage.

The geometry/position specification string Geo can be

• a specification of the patch corner and orientation such as xc=.03 yc=.05 ang=30 if the patch geometry is specified using the laminate specification.
• rect shapes [xc lx nx yc ly ny alpha MatId ProId] where MatId and ProId are filled automatically if not provided.
• circ shapes [xc yc rc lc (MatId ProId)]
• global lx=.4 ly=.3 lc=.02 -Sens. The option -Sens generates a sensor entry corresponding to normal displacement of the initial mesh. Alternatively you can add a sensor configuration SensDOF entry see sdtweb('sensor#scell') or sdtweb('sensor#sstruct').

% Start by defining properties of the underlying laminate
mdl=struct('Node',[],'Elt',[], ... % empty model
    'pl', ... % composite layer property
      [1 fe_mat('m_elastic','SI',1) 42.5e9 .042 1490 3.35e9 .01], ...
     'il', ... % laminate definition (6 layers at 0,90,0,90,0,90)
     p_shell(['dbval 1 laminate    1 2.167e-4 0    1 2.167e-4 90 ' ...
         '1 2.167e-4 0 1 2.167e-4 90 1 2.167e-4 0 1 2.167e-4 90']), ...
     'unit','SI');
RG=struct;
RG.list={'Name','Lam','shape'
   'Main_plate', mdl,'global lx=.4 ly=.3 lc=.02'
   'Act1','BaseId1 +SmartM.MFC-P1.2814 -SmartM.MFC-P1.2814.in','xc=.35 yc=.25 ang=30'
   'Sen2','BaseId1 +SmartM.MFC-P1.2814','xc=.03 yc=.05 ang=30'
   'Sen3','BaseId1 +Noliac.NCE51.OD25TH1','xc=.05 yc=.25'
   };
cf=feplot;d_piezo('MeshPlate',RG);cf.mdl.name='Plate with piezo';
p_piezo('electrodeinfo',cf.mdl.GetData)
matgui('jil',cf);matgui('jpl',cf); % Display properties

See d_piezo('TutoPzMeshingAuto') for more illustrations.

MeshBaseAccel

Other meshing scripts do not have options, and simply produce the mesh for a specific tutorial script (see below). Run for example

model=d_piezo('MeshBaseAccel')}

without options. If no output if specified, the mesh is generated and plotted in the feplot window.

Tuto

All the tutorial scripts described in the documentation are available, and can be accessed either in command mode or through a gui interface. To have access to the gui, run d_piezo('tuto') and expand the demo script (+), the arrows allow to run the different steps separately.
To run a demo script in command line, just run d_piezo('Scriptname'), or d_piezo('Scriptname-sn') for a specific step (replace n by the step needed).
See section 1.1 for more details.

-19.4mm21mm24.2mm [RO][RO]10mm