HIRENASD Beam FEM

This contains attempts to create BEAM FEM model. I have started a <a href="https://c3.nasa.gov/dashlink/projects/47/blog/">Blog</a> to discuss this... please put your comments there and I will attempt to keep everything updated. <a href="https://c3.nasa.gov/dashlink/static/media/dataset/Emails_AB_CDW.pdf">Correspondence between A.B. and CDW is provided to assist in developing NASTRAN Beam FEM <br> (through July 1)(PDF)</a> The original data provided by Alexander is shown in <a href="https://c3.nasa.gov/dashlink/static/media/dataset/model_input-extract.txt">model_input-extract.txt </a> Additional files loaded July 21, 2011:<br> <LI><a href="https://c3.nasa.gov/dashlink/static/media/dataset/WingMassLength_Comparisons.xls">Comparison of Wing Masses, and Lengths, and Mass calculated from provided densities, and lengths</a> <LI><a href="https://c3.nasa.gov/dashlink/static/media/dataset/Compare_W_eig_20110720.xlsx.pdf">Comparison of Model Masses and frequencies</a> <LI><a href="https://c3.nasa.gov/dashlink/static/media/dataset/LP_CDW_emails.pdf">Emails dealing with offsets for bending and center of mass (between Proctor and Wieseman)</a> <LI><a href="https://c3.nasa.gov/dashlink/static/media/dataset/BeamProperties_modrho.xlsx">Spreadsheet that contains element beam properties</a> used for debugging <LI><a href="https://c3.nasa.gov/dashlink/static/media/dataset/OneElement_TipLoad.bdf">One element beam model to check beam stiffnesses</a> <LI><a href="https://c3.nasa.gov/dashlink/static/media/dataset/Emails_20110728.pdf"> Email correspondence as of July 28, 2011</a> - includes a cursory check of the bending and center of mass locations. <P> <TABLE BORDER = 1> <TR> <TD>X1,X2,X3</TD> <TD>Inertias/Kappa</TD> <TD>Mode 1 Freq, Hz</TD> <TD>Mode 2 Freq, Hz</TD> <TD>File name (ms103_beam_)</TD> </TR><TR> <TD>1,0,0</TD> <TD>modified*</TD> <TD>26.37854</TD><TD>83.69360</TD> <TD><a href="https://c3.nasa.gov/dashlink/static/media/dataset/ms103_beam_100_modi_ccs_o1_k_nsm1_nm1.bdf"> 100_modi_ccs_o1_k_nsm1_nm1</a> </TD></TR><TR> <TD>1,0,0</TD> <TD>modified*/Beam properties modified</TD> <TD>26.37855</TD><TD>83.69344</TD> <TD><a href="https://c3.nasa.gov/dashlink/static/media/dataset/ms103_beam_100_modi_ccs_o1_k2_nsm1_nm1.bdf"> 100_modi_ccs_o1_k2_nsm1_nm1</a> </TD></TR><TR> <TD>cosa,0,-sina</TD> <TD>as provided</TD> <TD>26.37949</TD><TD>83.69533</TD> <TD><a href="https://c3.nasa.gov/dashlink/static/media/dataset/ms103_beam_ca_0_nsa_ccs_o1_k_nsm1_nm1.bdf"> ca_0_nsa_ccs_o1_k_nsm1_nm1</a> </TD></TR><TR> <TD>cosa,0,-sina</TD> <TD>as provided</TD> <TD>26.37949</TD><TD>83.69533</TD> <TD><a href="https://c3.nasa.gov/dashlink/static/media/dataset/ms103_beam_ca_0_nsa_ccs_o1_k_nsm1_nm1.bdf"> ca_0_nsa_ccs_o1_k_nsm1_nm1</a> </TD></TR> </TABLE> <BR> <P> <P> Below are frequencies with different permutations of <LI> X1,X2,X3 definitions on CBEAM card <br>A) - 1,0,0 or <br>B) ca_0_nsa = cos(alpha),0,-sin(alpha) or <br> C)nca_0_sa = -cos(alpha),0,sin(alpha) on the beam card <br> <LI> coordinate system (CCS) is converted from original <LI> O1 indicates that offsets W1-W3 were included between the node and the shear center <LI> nsm1 = beam density is unchanged and includes the non-structural mass <LI> nsm2 = non-structural mass is separated from the beam mass density <LI> nm = calculation of offset N1,N2 for beginning and end of each beam segment is performed - different ways depending on the index <LI> modi = inertias provided by Boucke were modified by the alpha. <LI> _k_ = kappa(K1,K2) were included in the model - values provided by Boucke (A.B.) <LI> _k2_ = kappa(K1/K2) modified along with beam properties per equations provided by A.B. <P> <TABLE BORDER = 1> <TR>Description<TD></TD> <TD>1st mode</TD><TD>2nd mode</TD></TR> <TR><TD>Boucke provided frequencies</TD><TD>25.33879547</TD><TD>78.63642299</TD></TR> <TR><TD>100_modi_ccs_o1_k2_nsm1_nm1</TD><TD>26.37855</TD><TD>83.69344</TD></TR>

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