5. C modeling#

5.1. Characteristics of modeling#

Item DKT with distorted mesh

_images/10000DE400001389000012EA6A84C4D25673A486.svg

Element slenderness: between 50 and 75.

Boundary conditions:

in all \(P\) nodes on the \(\mathrm{Xp}=0.\) side:

DDL_IMPO: (GROUP_NO: COTE DX:0., DY:0., DZ: 0., DRY: 0.)

Node name:

Point \(1\) = \(\mathrm{N1}\)

Point \(\mathrm{25 }\) = \(\mathrm{N25}\)

5.2. Characteristics of the mesh#

Number of knots:

25

Number of meshes and types:

32 TRIA3

5.3. Tested sizes and results#

Frequency ( \(\mathrm{Hz}\) )

Clean mode order

Reference

Test NAFEMS

Aster

% difference

NAFEMS

1

0.421

0.4174

0.4163

—1.12

2

1.029

1.020

1.020

1.0340

0.49

3

2.582

2.571

2.571

2.5644

—0.68

4

3.306

3.317

3.317

3.2539

—1.58

5

3.753

3.780

3.7433

—0.26

6

6.555

6.883

6.4898

—0.99

Test 0

7

7.3756

7.2119

—2.22

8

7.7332

7.6026

—1.69

9

8.5567

8.3232

—2.73

10

11.1199

10.7735

—3.12

11

11.6474

11.2607

—3.32

12

14.3531

13.3008

—7.34

5.4. notes#

Calculations made by:

OPTION = “PLUS_PETITE” CALC_FREQ =_F (NMAX_FREQ = 12) SOLVEUR_MODAL =_F (METHODE = “TRI_DIAG”)

5.5. Contents of the results file#

12 first natural frequencies, eigenvectors and modal parameters.