HIRENASD Beam FEM

A dataset shared by CAROL WIESEMAN, updated on Jul 05, 2011

Summary

Contributing Author(s) :
Carol Wieseman

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
    100_modi_ccs_o1_k_nsm1_nm1 26.3785483.6936
    ca_0_nsa_ccs_o1_k_nsm1_nm1 26.3794983.69533
    ca_0_nsa_modi_ccs_o1_k2_nsm1_nm126.379583.69762
    ca_0_nsa_modi_ccs_o1_k_nsm1_nm126.3794983.69778
    nca_0_sa_ccs_o1_k 26.3746683.62444
    nca_0_sa_ccs_o1_k_nsm1_nm126.3395582.98219
    nca_0_sa_ccs_o1_k_nsm1_nm226.377883.67184
    nca_0_sa_ccs_o1_k_nsm2_nm126.345283.07531
    nca_0_sa_ccs_o1_k_nsm2_nm226.3778583.6722
    nca_0_sa_modi_ccs_o1_k_nsm1_nm1 26.3395382.98429

    Matlab code has been requested that reads the input deck. This code also does some debugging and calculation. The disclaimer is that it isn't easy to read. If you find a coding error please let me know. There are two codes - one for reading that also does some distance calculations and then a code that writes the BDF file.

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    Source Files

    model_input-extract.txt
    Beam Data provided by A. Boucke
    40.2 KB 131 downloads
    spccards.bdf
    include file required for nastran
    62 bytes 107 downloads
    Image: image001.png
    31.9 KB 72 downloads
    Image: image002.png
    26.6 KB 42 downloads
    Image: CBEAM.png
    25.0 KB 288 downloads
    WingMassLength_Comparisons.xls
    Comparison of Masses provided in comments with calculated using provided densities, provided and calculated lengths
    60.0 KB 104 downloads
    Compare_W_eig_20110720.xlsx.pdf
    Comparison of Masses and Frequencies
    19.5 KB 81 downloads
    LP_CDW_emails.pdf
    Emails dealing with offset calculations of Beam model predominantly
    826.9 KB 97 downloads
    ms103_modi_o1_nsm1.bdf
    Latest FEM - double precision
    25.9 KB 93 downloads
    ms103_modi_o1_nsm1_modrho.bdf
    Latest FEM - double precision (modified density)
    25.9 KB 96 downloads
    BeamProperties_modrho.xlsx
    Beam Properties - debugging of Beam model
    74.4 KB 111 downloads
    OneElement_TipLoad.bdf
    Nastran input file with tip load applied at Grid #23
    2.4 KB 90 downloads
    StructuralAnalysisStatus.pdf
    Slides presented on telecon
    54.6 KB 109 downloads
    Emails_20110728.pdf
    390.4 KB 101 downloads
    Emails_AB_CDW.pdf
    186.8 KB 114 downloads

    Support/Documentation

    CBEAM.pdf
    MSC documentation on CBEAM cards
    248255 321 downloads
    PBEAM.pdf
    Documentation on PBEAM
    236417 162 downloads

    For any questions, contact this resource's administrator: NDC-cwiesema

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