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
    1st mode2nd mode
    Boucke provided frequencies25.3387954778.63642299
    100_modi_ccs_o1_k2_nsm1_nm126.3785583.69344

    • Resources

    Name Format Description Link
    BeamProperties_modrho.xlsx Unknown Beam Properties - debugging of Beam model Open resource
    CBEAM.pdf PDF MSC documentation on CBEAM cards Open resource
    CBEAM.png PNG CBEAM.png Open resource
    Compare_W_eig_20110720.xlsx.pdf Unknown Comparison of Masses and Frequencies Open resource
    Emails_20110728.pdf PDF Emails_20110728.pdf Open resource
    Emails_AB_CDW.pdf PDF Emails_AB_CDW.pdf Open resource
    image001.png PNG image001.png Open resource
    image002.png PNG image002.png Open resource
    LP_CDW_emails.pdf Unknown Emails dealing with offset calculations of Beam model predominantly Open resource
    model_input-extract.txt Text Beam Data provided by A. Boucke Open resource
    ms103_modi_o1_nsm1.bdf Binary Latest FEM - double precision Open resource
    ms103_modi_o1_nsm1_modrho.bdf Binary Latest FEM - double precision (modified density) Open resource
    OneElement_TipLoad.bdf Binary Nastran input file with tip load applied at Grid #23 Open resource
    PBEAM.pdf PDF Documentation on PBEAM Open resource
    spccards.bdf Binary include file required for nastran Open resource
    StructuralAnalysisStatus.pdf PDF Slides presented on telecon Open resource
    WingMassLength_Comparisons.xls XLS Comparison of Masses provided in comments with calculated using provided densities, provided and calculated lengths Open resource

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