4. B modeling#

Plates DKT and DST - cob mesh

_images/1000000000000187000001F9CA393ECBFC3138D6.png

The discretized geometry on the mean radius \({R}_{m}=0.369m\) is shown above. Elements DKT and DST are planar facets with three nodes of type TRIA3 arranged in spikes. The number of knots on the circumference is 100 and on the length 5.

4.1. Characteristics of the mesh#

Number of knots: 500

Number of meshes and type: 800 TRIA3

4.2. Tested values#

(Frequencies in hertz)

Mode

Reference

Aster **** DKT **

% difference

Aster** DST **

% difference

ovalization

210.55 210.55

211.54 211.54

0.47 0.47

203.69 203.69

—3.25 —3.25

trifoliate

587.92 587.92

598.64 598.64

1.82 1.82

568.70 568.70

—3.27 —3.27

off plan

205.89 205.89 588.88 588.88

254.89 254.89 707.53 707.53

23.80 23.80 20.14 20.14

202.38 202.38 617.18 617.18

—1.70 —1.70 4.81 4.81

4.3. notes#

Plate modeling DKT does not allow off-plane modes to be represented correctly. The errors on the frequencies in plates DST are relatively significant.