u4.52.02 Operator CALC_MODES

• 1. Purpose
• 2. Syntax
• 3. Operands
  • 3.1. Principles
  • 3.2. Keyword TYPE_RESU
  • 3.3. Operand CHAM_MATER
  • 3.4. Operand CARA_ELEM
  • 3.5. Operands MATR_RIGI/MATR_A/MATR_MASS/MATR_RIGI_GEOM//MATR_B/MATR_AMOR
  • 3.6. Operand OPTION
  • 3.7. Keyword factor SOLVEUR_MODAL
  • 3.8. Keyword factor CALC_FREQ (if TYPE_RESU =” DYNAMIQUE “)
  • 3.9. Keyword factor CALC_CHAR_CRIT (if TYPE_RESU =” MODE_FLAMB “or” GENERAL “)
  • 3.10. Operands common to CALC_FREQ and CALC_CHAR_CRIT: SEUIL_FREQ/SEUIL_CHAR_CRIT, PREC_SHIFT, NMAX_ITER_SHIFT
  • 3.11. Keyword factor SOLVEUR
  • 3.12. Keyword factor VERI_MODE
  • 3.13. Operand STOP_BANDE_VIDE (for the simultaneous iteration method only)
  • 3.14. Operand NIVEAU_PARALLELISME
  • 3.15. Keyword AMELIORATION
  • 3.16. Keywords for post-processing: NORM_MODE, FILTRE_MODE, IMPRESSION
  • 3.17. Operand INFO
  • 3.18. Operand TITRE
• 4. Verification phase
• 5. Execution phase
• 6. Modal Settings/ Mode Standard/ Modal Position
• 7. Performance Optimization CPU
  • 7.1. Linear solver parallelism
  • 7.2. Calculation of modes by sub-bands
• 8. Printing the results
• 9. Sorting modes/Characterization of mode_meca_*
• 10. Examples
  • 10.1. Calculation of the 5 natural modes closest to a given frequency
  • 10.2. Calculation of the critical loads contained in a band
  • 10.3. Chaining INFO_MODE + CALC_MODES (excerpt from SDLS504a)
  • 10.4. Calculation of the natural frequencies contained in the [50 ; 150] Hz band
  • 10.5. Calculation of the natural frequencies closest to 20 and 50 Hz
  • 10.6. Dividing into several sub-bands