Modeling A ============== Characteristics of modeling ----------------------------------- Characteristics of the mesh ---------------------------- The rotor is meshed in 40 finite shaft elements of type POU_D_T regularly distributed and includes 2 discrete elements of type DIS_TRpour: the modeling of the bearings. Number of knots: 41 Number and type of elements: 40 SEG2 2 POI1 Tested sizes and results ------------------------------ The relative tolerance criteria are 1% for 'SOURCE_EXTERNE' results and 5th -3% for 'NON_REGRESSION' results. The values of the first 6 natural frequencies of the rotor are as follows. +---------------+-----------------------------------------+-----------------------------------------+ |**Freq Number**|**Rotor ASTER** |**Calculation CADYRO** | + +-----------------------------------------+-----------------------------------------+ | |:math:`F` **(** :math:`\mathit{Hz}` **)**|:math:`F` **(** :math:`\mathit{Hz}` **)**| +---------------+-----------------------------------------+-----------------------------------------+ |1 |1.00860E+02 |1.0090E+02 | +---------------+-----------------------------------------+-----------------------------------------+ |2 |1.00860E+02 |1.0090E+02 | +---------------+-----------------------------------------+-----------------------------------------+ |3 |3.92529E+02 |3.9305E+02 | +---------------+-----------------------------------------+-----------------------------------------+ |4 |3.92529E+02 |3.9305E+02 | +---------------+-----------------------------------------+-----------------------------------------+ |5 |8.50239E+02 |8.5242E+02 | +---------------+-----------------------------------------+-----------------------------------------+ |6 |8.50239E+02 |8.5242E+02 | +---------------+-----------------------------------------+-----------------------------------------+ **Table** 3.3-1 **: Rotor natural frequencies** The values of the first 10 natural frequencies of the massif are as follows. +---------------+-----------------------------------------+-----------------------------------------+ |**Freq Number**|**Rotor ASTER** |**Calculation CADYRO** | + +-----------------------------------------+-----------------------------------------+ | |:math:`F` **(** :math:`\mathit{Hz}` **)**|:math:`F` **(** :math:`\mathit{Hz}` **)**| +---------------+-----------------------------------------+-----------------------------------------+ |1 |2.19224E+02 |2.21045E+02 | +---------------+-----------------------------------------+-----------------------------------------+ |2 |2.56714E+02 |2.59147E+02 | +---------------+-----------------------------------------+-----------------------------------------+ |3 |3.44965E+02 |3.47706E+02 | +---------------+-----------------------------------------+-----------------------------------------+ |4 |4.17655E+02 |4.20215E+02 | +---------------+-----------------------------------------+-----------------------------------------+ |5 |4.88441E+02 |4.92291E+02 | +---------------+-----------------------------------------+-----------------------------------------+ |6 |5.17576E+02 |5.21767E+02 | +---------------+-----------------------------------------+-----------------------------------------+ |7 |6.19092E+02 |6.24727E+02 | +---------------+-----------------------------------------+-----------------------------------------+ |8 |6.41466E+02 |6.45547E+02 | +---------------+-----------------------------------------+-----------------------------------------+ |9 |7.32139E+02 |7.36375E+02 | +---------------+-----------------------------------------+-----------------------------------------+ |10 |7.76297E+02 |7.78041E+02 | +---------------+-----------------------------------------+-----------------------------------------+ **Table** 3.3-2 **: Natural frequencies of the mass** The values of the first 7 frequencies when stopped, for the two calculation methods (direct and substructured), are shown in the table below. +---------------+-----------------------------------------+--------------------------------------------+-----------------------------------------+ |**Freq Number**|**Rotor ASTER direct calculation** |**Calculus ASTER substructured calculation**|**Calculation CADYRO** | + +-----------------------------------------+--------------------------------------------+-----------------------------------------+ | |:math:`F` **(** :math:`\mathit{Hz}` **)**|:math:`F` **(** :math:`\mathit{Hz}` **)** |:math:`F` **(** :math:`\mathit{Hz}` **)**| +---------------+-----------------------------------------+--------------------------------------------+-----------------------------------------+ |1 |1.00675E+02 |1.00675E+02 |1.00717E+02 | +---------------+-----------------------------------------+--------------------------------------------+-----------------------------------------+ |2 |1.00827E+02 |1.00827E+02 |1.00866E+02 | +---------------+-----------------------------------------+--------------------------------------------+-----------------------------------------+ |3 |2.19250E+02 |2.19933E+02 |2.21064E+02 | +---------------+-----------------------------------------+--------------------------------------------+-----------------------------------------+ |4 |2.56711E+02 |2.56822E+02 |2.59143E+02 | +---------------+-----------------------------------------+--------------------------------------------+-----------------------------------------+ |5 |3.40422E+02 |3.48884E+02 |3.42981E+02 | +---------------+-----------------------------------------+--------------------------------------------+-----------------------------------------+ |6 |3.91994E+02 |3.92003E+02 |3.92524E+02 | +---------------+-----------------------------------------+--------------------------------------------+-----------------------------------------+ |7 |3.96857E+02 |3.98334E+02 |3.97556E+02 | +---------------+-----------------------------------------+--------------------------------------------+-----------------------------------------+ **Table** 3.3-3 **: Natural frequencies obtained by direct and substructured calculations**