[SOLVED] Frequency analysis - Less eigenmodes are calculated

[EkaitzEsteban]

Hello,

I have a question regarding to obtained results in frequency analysis.

I have a free-free workpiece (without constrains or boundary conditions).

I set the calculation of 20 eigenmodes by changing in the inp file the amount of eigenmodes

Code: Select all

*STEP 
*FREQUENCY
20,0.0,100000.0
*END STEP

I also setthe eigemodecount parameter to 20 in the FreeCAD GUI.

Code: Select all

FreeCAD.getDocument("RHmesh").getObject("CalculiXccxTools").EigenmodesCount = 20

However only frequency mode 4,5 and 6 are shown. And also in the .dat file:

Code: Select all

    E I G E N V A L U E   O U T P U T

 MODE NO    EIGENVALUE                       FREQUENCY   
                                     REAL PART            IMAGINARY PART
                           (RAD/TIME)      (CYCLES/TIME     (RAD/TIME)

      4   0.6002134E+02   0.7747344E+01   0.1233028E+01   0.0000000E+00
      5   0.1152407E+03   0.1073502E+02   0.1708532E+01   0.0000000E+00
      6   0.1303168E+03   0.1141564E+02   0.1816855E+01   0.0000000E+00

only three modes appear, why?

I forgot any configuration parameter?

best regards,
Ekaitz.

EDIT: The problem was the units. The imported mesh grid was in meters whereas FreeCAD needs to be in milimeters

Thx!

OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.13528 (Git)
Build type: Release
Branch: releases/FreeCAD-0-17
Hash: 5c3f7bf8ec51e2c7187789f7edba71a7aa82a88b
Python version: 2.7.14
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.2.0
Locale: Spanish/Spain (es_ES)

[EkaitzEsteban]

EDIT: The workpiece is an imported mesh only containing nodes and volumes.