4. B modeling#

4.1. Characteristics of modeling#

Item DKT coarser mesh

_images/10001252000013890000149137E14AF4A2B57484.svg

Elemental slenderness: \(\frac{a}{4t}=50\).

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 \(\mathrm{25 }\) = \(\mathrm{N25}\)

4.2. Characteristics of the mesh#

Number of knots:

25

Number of meshes and types:

32 TRIA3

4.3. Tested sizes and results#

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

Clean mode order

Reference

Test NAFEMS

Aster

% difference

NAFEMS

1

0.421

0.4174

0.4165

—1.07

2

1.029

1.020

1.020

1.0301

0.11

3

2.582

2.564

2.5793

—0.10

4

3.306

3.302

3.302

3.2572

—1.47

5

3.753

3.769

3.769

3.7397

—0.35

6

6.555

6.805

6.805

6.4544

—1.54

Test 0

7

7.3756

7.2821

—1.27

8

7.7332

7.6852

—0.62

9

8.5567

8.3764

—2.11

10

11.1199

10.7209

—3.59

11

11.6474

11.2904

—3.06

12

14.3531

13.7573

—4.16

4.4. notes#

Calculations made by:

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

4.5. Contents of the results file#

12 first natural frequencies, eigenvectors and modal parameters.