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  1. marouaha

    modal damping

    Thx amanuensis, but in this book i didn't found this equation ξfriction and the chapter 30 is about VIBRATION OF STRUCTURES INDUCED BY FLUID FLOW
  2. marouaha

    segment to segment contact

    hello, does nastran 2012 segment to segment contact cannot includ friction? may i have any alternative. or i must change my model
  3. marouaha

    sunusoidal load nastran

    hello thinx, I constraint the dofs 1.3.4.5.6 dof and i apply a sine wave at the clamped end but when i plot the results the beam translate in the y direction. i dont obtaine the mode shape. have you any proposition. the attached file is the bdf card of the...
  4. marouaha

    shaker vibration finite element modeling

    Hello, I wont to model the shaker vibration using sine wave using msc nastran. this shaker is monted at the climped end so i constraint the 1..3.4.5.6 dof and i apply a sinusoidal force at this climped end. the shape i found are wrong. may some help me
  5. marouaha

    modal damping

    thx, i want to determine the modal damping values from a frequency responce analysis or a transient analysis.
  6. marouaha

    modal damping

    Thx, eta is the modal damping?? can you submit please the document or the reference for this equation? Cheers,
  7. marouaha

    modal damping

    Hi, how can i using freqyency response analysis retreive the modal damping value? thx
  8. marouaha

    modal analysis

    hi, can you dtermine the strain energy to calculate the damping?? thx regard
  9. marouaha

    modal damping

    Hello, Can'I using a modal analysis determine the effect of friction on the modal damping value of a structure? or I must apply a sinusoidal force and guettig the the damping value correspending to the modal frequency. thx
  10. marouaha

    modal analysis

    or i must applay a sunusoidal force and then determin the modal damping
  11. marouaha

    modal analysis

    hello, Can i determine the effect of friction on the modal damping values? using a finite element method
  12. marouaha

    sunusoidal load nastran

    i determine the damping using the strain energy methode by the stress element and the strain element of every bending mode
  13. marouaha

    sunusoidal load nastran

    using sol 109 or 112 i can't get the modal analysis. i attached my .bdf file. i apply the following time dependent force t f 0 0 0.0075 45 0.015...
  14. marouaha

    sunusoidal load nastran

    Hello olgola, Thanks for the reply the problem definition is: I work with msc nstran with patran 12.2. I use to simulate a sample excited with a shaker. i must imput a sunusoidal displacement at the clamped end of the sample and then i recover the response from the free end. Then, i must...
  15. marouaha

    sunusoidal load nastran

    thx [smile] , so can i have the modal damping and the friction damping of the bending modes?
  16. marouaha

    sunusoidal load nastran

    thx again, can you tell if nastran can determine the damping effect of friction between to plate.
  17. marouaha

    sunusoidal load nastran

    thx, I work with msc nstran with patran 12.2.
  18. marouaha

    sunusoidal load nastran

    hi, i need to simulate a sample excited with a shaker. i must imput a sunusoidal displacement at the clamped end of the sample and the i recover the response from the free end . i use the dirct frequency response analysis. i ask if some one can help me to imput the sinusoidal displacement.
  19. marouaha

    contact problem

    Can I add contact with friction in normal modes analysis sol(103) using Msc Nastran? If not is there any other alternative? thinks
  20. marouaha

    Msc Patran/nastran

    this is the detail USER FATAL MESSAGE 3060 (PREFACE) - AUTHORIZATION ERROR *** UNABLE TO OBTAIN LICENSES FOR Nastran Solver PLEASE REFER TO THE LOG FILE FOR ADDITIONAL DETAILS thx

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