Two symmetric areas are created to ensure model

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Unformatted text preview: n is chosen and the first five modes are extracted. Note that the input value for υxy is calculated from: ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–141 VM60 v xy = v yx Ey Ex = .25 1x106 25 x106 = .01 (minor Poisson’s ratio) The geometric input in spherical coordinates is calculated as: θ=ψ= 180 100 = 19.0986° π 300 The alternate method of Poisson's ratio input (PRXY) could also have been used. Results Comparison Target f, Hz 1–142 ANSYS Ratio 0.73215 0.73151 0.999 ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. VM61: Longitudinal Vibration of a Free-free Rod Overview Reference: W. T. Thomson, Vibration Theory and Applications, 2nd Printing, Prentice-Hall, Inc., Englewood Cliffs, NJ, 1965, pg. 269, ex. 8.3-1. Analysis Type(s): Mode-frequency Analysis (ANTYPE = 2) Element Type(s): 2-D Elastic Beam Elements (BEAM3) Input Listing: vm61.dat Test Case Determine the first three natural frequencies fi of a free-free rod (a rod with both e...
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This note was uploaded on 12/09/2010 for the course DEPARTMENT E301 taught by Professor Kulasinghe during the Spring '09 term at University of Peradeniya.

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