5. C modeling#

Plates DKT and DST - star mesh

_images/100000000000018F000001FEC4548CD0DD3BA8F6.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 stars. The number of knots on the circumference is 100 and on the length 5.

5.1. Characteristics of the mesh#

Number of knots: 500

Number of meshes and type: 800 TRIA3

5.2. 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

208.20 208.20

—1.11 —1.11

trifoliate

587.92 587.92

598.58 598.58

1.81 1.81

581.00 581.00

—1.18 —1.18

off plan

205.89 205.89 588.88 588.88

284.38 284.38 797.24 797.24

38.12 38.12 35.38 35.38

225.23 225.23 690.73 690.73

9.39 9.39 17.29 17.29

5.3. notes#

Plate models DKT and DST do not allow out-of-plane modes to be represented correctly.