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  • Users: vidiii
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  1. vidiii

    Piezo material properties for ANSYS

    ...I find the data that ANSYS requires? The data that ANSYS needs: ! Material properties for PZT-4 ! mp,DENS,1,7700 ! Density, kg/m**3 tb,DPER,1 ! Relative permittivity at constant strain tbdata,1,729,635,729 ! - Alternative input of permittivity if used...
  2. vidiii

    Piezoelectric material properties

    ...I find the data that ANSYS requires? The data that ANSYS needs: ! Material properties for PZT-4 ! mp,DENS,1,7700 ! Density, kg/m**3 tb,DPER,1 ! Relative permittivity at constant strain tbdata,1,729,635,729 ! - Alternative input of permittivity if used...
  3. vidiii

    Changing CONFIG in workbench

    Final solution: FINISH /CONFIG,NRES,1000000 /PREP7 /NRES,,999999
  4. vidiii

    Changing CONFIG in workbench

    Actually it didnt work out, maybe because I get: ! Commands inserted into this file will be executed just prior to the Ansys SOLVE command. ! These commands may supercede command settings set by Workbench. And it must be set in the beginning of the file. Any ideas?
  5. vidiii

    Changing CONFIG in workbench

    Solved: Insert command: /CONFIG,NRES,1e6
  6. vidiii

    Changing CONFIG in workbench

    I get the following error in ANSYS Workbench when doing a flexible dynamics simulation: *** ERROR *** CP = 2183.203 TIME= 22:50:21 Number of results on results file exceeds maximum of 1000. Maximum may be increased with /CONFIG command. I'm...
  7. vidiii

    Flexible dynamics (time history solution)

    ...bending mode, by: 1) applying a pressure on one side of the plate, and releasing it shortly after 2) applying a pressure function = (amplitude*sinus(time*360*frequency)) In the first case the plate will move in resonance, but I can only control the resonance by changing the material...
  8. vidiii

    Voltage Phase Difference (harmonic analysis)

    Hi, Is it possible to obtain a voltage phase difference between 2 electrodes (areas) with ANSYS? I have 2 (piezo) patches and in total 4 areas to apply a voltage. If I apply 0volt on one area, and 100 volt on the other area, I can apply the wished 100Volt on one patch. The same can be done...
  9. vidiii

    Ultra light/thin yet stiff material

    Thank you very much for your replies. Do you know or have experience with international suppliers with quick shipment of thin sheets of carbon fiber-reinforced composites (CFRP of 0.5 to 0.1 milimeter sheets in very small quantities, because its for making a small prototype).
  10. vidiii

    Ultra light/thin yet stiff material

    Hi, Does anybody know thin and light but stiff materials that could be used for wing material for the development of insect-like micro aerial vehihicles. The price is not very important, however it is prefered that international suppliers can ship it (to Europe). Any suggestions are very...
  11. vidiii

    Selecting nodes in a triangular area

    Hi, I have made a parametric model of ANSYS Batch (in APDL). The parameters are defined in the beginning, and every paramater can be changed with MATLAB and the results of ANSYS will be saved (in txt) and read in MATLAB. After that MATLAB can rechange a parameter and let ANSYS run again, etc...
  12. vidiii

    Maximize the first resonance frequency of a plate.

    Thanks for your reply GregLocock! I'm interested in increasing and maximizing the fundamental resonance frequency. The idea is to change the geometry (using ribs or other techniques) in a way that the natural frequency increases while the constraints are respected. The depth dimension is not a...
  13. vidiii

    Maximize the first resonance frequency of a plate.

    The boundary condition is free clamping, but the rigid body modes are neglected. It is not allow to make holes, you must respect a certain minimum thickness of 2mm. floattubber: Its the frequency, not response, that needs to be maximized. Why? The plate is used in a design where it operates at...
  14. vidiii

    Maximize the first resonance frequency of a plate.

    Hi I have a plate made of a certain material (plastic, cannot be changed). I need to maximize the first resonance frequency of the plate. The availible methods are: making some places thinner and using ribs. When using ribs on the plate with fixed dimensions (100mm x 75mm x 2mm) you can't...
  15. vidiii

    Problems output of results in VISTA

    Drej; I tried your method however it didn't work. But I found an alternative solution for this problem: /POST1 /OUTPUT,eigfreq,txt,C:\tmpANSYS\, *get,Frequentie1,MODE,1,FREQ *get,Frequentie2,MODE,2,FREQ *get,Frequentie3,MODE,3,FREQ *STATUS,Frequentie1 *STATUS,Frequentie2 *STATUS,Frequentie3...
  16. vidiii

    Problems output of results in VISTA

    ...in ANSYS and try to write the results to a txt it seems to work just fine in XP, but in Vista I always get an empty file. FINISH /POST1 !* write output to file C:\tmpANSYS\eigfreq.txt /OUTPUT,eigfreq,txt,C:\tmpANSYS\, !* specify output SET,LIST I have turned off the UAC of Vista. I...
  17. vidiii

    Let cams move a shaft in Inventor

    Hi, I have made a small basic motor in inventor. I have constrained the drawings in a way that the motor runs correctly, however there is one error. The cams on the camshaft need to push up a shaft that is connected with the valves. Is there a possible way to let the cams push the valve up and...
  18. vidiii

    problems with VADD

    Thanks for the valuable answers. The problem is resolved using substract operations
  19. vidiii

    problems with VADD

    Hi, When I make a complex volume with keypoints, I do this by creating sub volumes, and use the VADD command to merge the volumes into one volume. In the help file is written that the original volumes (and their corresponding areas, lines and keypoints) will be deleted. The problem is that...
  20. vidiii

    Select nodes on a plane which is part of another plane

    ...v,17,18,19,20,21,22,23,24 v,25,26,27,28,29,30,31,32 vglue,all ESIZE,2e-3,0, TYPE, 2 MAT, 2 REAL, ESYS, 0 SECNUM, !* MSHAPE,1,3D MSHKEY,0 !* FLST,5,3,6,ORDE,2 FITEM,5,4 FITEM,5,-6 CM,_Y,VOLU VSEL, , , ,P51X CM,_Y1,VOLU CHKMSH,'VOLU' CMSEL,S,_Y...

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