HIRENASD Beam FEM

Description

This contains attempts to create BEAM FEM model. I have started a Blog to discuss this... please put your comments there and I will attempt to keep everything updated. Correspondence between A.B. and CDW is provided to assist in developing NASTRAN Beam FEM
(through July 1)(PDF) The original data provided by Alexander is shown in model_input-extract.txt Additional files loaded July 21, 2011:
  • Comparison of Wing Masses, and Lengths, and Mass calculated from provided densities, and lengths
  • Comparison of Model Masses and frequencies
  • Emails dealing with offsets for bending and center of mass (between Proctor and Wieseman)
  • Spreadsheet that contains element beam properties used for debugging
  • One element beam model to check beam stiffnesses
  • Email correspondence as of July 28, 2011 - includes a cursory check of the bending and center of mass locations.

    X1,X2,X3 Inertias/Kappa Mode 1 Freq, Hz Mode 2 Freq, Hz File name (ms103_beam_)
    1,0,0 modified* 26.3785483.69360 100_modi_ccs_o1_k_nsm1_nm1
    1,0,0 modified*/Beam properties modified 26.3785583.69344 100_modi_ccs_o1_k2_nsm1_nm1
    cosa,0,-sina as provided 26.3794983.69533 ca_0_nsa_ccs_o1_k_nsm1_nm1
    cosa,0,-sina as provided 26.3794983.69533 ca_0_nsa_ccs_o1_k_nsm1_nm1

    Below are frequencies with different permutations of

  • X1,X2,X3 definitions on CBEAM card
    A) - 1,0,0 or
    B) ca_0_nsa = cos(alpha),0,-sin(alpha) or
    C)nca_0_sa = -cos(alpha),0,sin(alpha) on the beam card
  • coordinate system (CCS) is converted from original
  • O1 indicates that offsets W1-W3 were included between the node and the shear center
  • nsm1 = beam density is unchanged and includes the non-structural mass
  • nsm2 = non-structural mass is separated from the beam mass density
  • nm = calculation of offset N1,N2 for beginning and end of each beam segment is performed - different ways depending on the index
  • modi = inertias provided by Boucke were modified by the alpha.
  • _k_ = kappa(K1,K2) were included in the model - values provided by Boucke (A.B.)
  • _k2_ = kappa(K1/K2) modified along with beam properties per equations provided by A.B.

    Description

    Resources

    1st mode2nd mode
    Boucke provided frequencies25.3387954778.63642299
    100_modi_ccs_o1_k2_nsm1_nm126.3785583.69344
    Name Format Description Link
    0 Beam Properties - debugging of Beam model https://c3.nasa.gov/dashlink/static/media/dataset/BeamProperties_modrho.xlsx
    5 include file required for nastran https://c3.nasa.gov/dashlink/static/media/dataset/spccards.bdf
    34 image001.png https://c3.nasa.gov/dashlink/static/media/dataset/image001.png
    34 image002.png https://c3.nasa.gov/dashlink/static/media/dataset/image002.png
    33 Documentation on PBEAM https://c3.nasa.gov/dashlink/static/media/dataset/PBEAM.pdf
    34 CBEAM.png https://c3.nasa.gov/dashlink/static/media/dataset/CBEAM.png
    5 Nastran input file with tip load applied at Grid #23 https://c3.nasa.gov/dashlink/static/media/dataset/OneElement_TipLoad.bdf
    33 Slides presented on telecon https://c3.nasa.gov/dashlink/static/media/dataset/StructuralAnalysisStatus.pdf
    33 Emails_20110728.pdf https://c3.nasa.gov/dashlink/static/media/dataset/Emails_20110728.pdf
    33 Emails_AB_CDW.pdf https://c3.nasa.gov/dashlink/static/media/dataset/Emails_AB_CDW.pdf
    0 Emails dealing with offset calculations of Beam model predominantly https://c3.nasa.gov/dashlink/static/media/dataset/LP_CDW_emails.pdf
    47 Beam Data provided by A. Boucke https://c3.nasa.gov/dashlink/static/media/dataset/model_input-extract.txt
    33 MSC documentation on CBEAM cards https://c3.nasa.gov/dashlink/static/media/dataset/CBEAM.pdf
    53 Comparison of Masses provided in comments with calculated using provided densities, provided and calculated lengths https://c3.nasa.gov/dashlink/static/media/dataset/WingMassLength_Comparisons.xls
    0 Comparison of Masses and Frequencies https://c3.nasa.gov/dashlink/static/media/dataset/Compare_W_eig_20110720.xlsx.pdf
    5 Latest FEM - double precision https://c3.nasa.gov/dashlink/static/media/dataset/ms103_modi_o1_nsm1.bdf
    5 Latest FEM - double precision (modified density) https://c3.nasa.gov/dashlink/static/media/dataset/ms103_modi_o1_nsm1_modrho.bdf

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    • dashlink
    • nasa
    • ames

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