3. Modeling A#
3.1. Characteristics of modeling and meshing#
The rotor is meshed in 3 uniformly distributed POU_D_T type finite shaft elements and includes 1 discrete element of type DIS_TRpour: the modeling of the bearing.
Number of knots: 4
Number and type of elements: 3 SEG2
1 POI1
3.2. Loading#
The unbalance is installed on the disk node. It is characterized by a mass of \({10}^{-4}\mathit{kg}\), a distance
to the neutral fiber of the \(0.15m\) tree and an initial phase shift of zero. Its value is \({15.10}^{\mathrm{-}6}\mathit{m.kg}\).
The linear law of speed increase imposed is as follows: \(\dot{\phi }\mathrm{=}\mathrm{416,7}t\)
3.3. Results#
We test the moment for which the vibratory eccentricity reaches its maximum as well as the corresponding maximum amplitude.
Result |
\({A}_{\mathit{max}}^{2}\) (\(m\)) |
\({t}_{\mathit{max}}\) (\(s\)) |
Reference CADYRO |
2.5810E-009 |
7.89 |
Reference LALANNE |
2.1996E-009 |
8.44 |
Code_Aster |
2.65697E-009 |
7.872350 |
Relative error Aster/ CADYRO |
|
|
Relative error Aster/ LALANNE |
|
|
Table 3.3-1 : Quantities tested for a linear law of increase in speed
