3. Modeling A#
3.1. Characteristics of modeling#
Discrete element in type translation **** DIS_T **
Beam elements: POU_D_T
The exciting spectral density is level 1 white noise.
The first 2 natural modes were taken into account in the calculation.
Damping is introduced in the form of modal damping in the random dynamic response operator. For all calculation cases, it is taken equal to \(\text{5\%}\)
3.2. Characteristics of the mesh#
Number of knots: 9
Number of meshes and types: 8 SEG2
3.3. notes#
Spectral densities are expressed in their physical units. For a force it will be in \({N}^{2}/\mathrm{Hz}\).
3.4. Tested sizes and results#
Displacement spectral density at point AM10 :
Frequency |
Method 1 |
Method 2 |
% difference |
\(4\mathrm{Hz}\) |
4.0298E—02 |
4.0298E—02 |
|
\(6\mathrm{Hz}\) |
9.2971E—02 |
9.2971E—02 |
|
\(8\mathrm{Hz}\) |
9.5164E—01 |
9.5164E—01 |
|
\(10\mathrm{Hz}\) |
1.7617E—01 |
1.7617E—01 |
|
\(12\mathrm{Hz}\) |
2.6695E—02 |
2.6695E—02 |
|