4. B modeling#
4.1. Characteristics of modeling and meshing#
The rotor is meshed in 3 uniformly distributed POU_D_T type finite shaft elements and includes 1 discrete DIS_TRpour type element: the bearing modeling.
Number of knots: 4
Number and type of elements: 3 SEG2
1 POI1
4.2. 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 exponential law of increase in speed imposed is as follows:
\(\dot{\phi }\mathrm{=}5100(1\mathrm{-}{\mathrm{exp}}^{\mathrm{-}\mathrm{0.3273t}})\)
4.3. 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 |
2.0160E-009 |
3.19 |
Reference LALANNE |
1.8063E-009 |
3.5 |
Code_Aster |
2.02538E-009 |
3.1956 |
Relative error Aster/ CADYRO |
|
|
Relative error Aster/ LALANNE |
|
|
Table 4.3-1 : Quantities tested for an exponential law of increase in speed
