HIRENASD Beam FEM

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* 26.37854 83.69360 100_modi_ccs_o1_k_nsm1_nm1 1,0,0 modified*/Beam properties modified 26.37855 83.69344 100_modi_ccs_o1_k2_nsm1_nm1 cosa,0,-sina as provided 26.37949 83.69533 ca_0_nsa_ccs_o1_k_nsm1_nm1 cosa,0,-sina as provided 26.37949 83.69533 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 mode 2nd mode Boucke provided frequencies 25.33879547 78.63642299 100_modi_ccs_o1_k2_nsm1_nm1 26.37855 83.69344