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Unformatted text preview: Mass Elements (MASS21) Input Listing: vm47.dat Test Case
A disk of mass m which has a polar moment of inertia J is suspended at the end of a slender wire. The torsional
stiffness of the wire is kθ. Determine the natural frequency f of the disk in torsion. Figure 47.1 Suspended Disk Problem Sketch Material Properties
m = 1 lb-sec2/in
kθ = 4.8 in-lb/rad Geometric Properties
J = .30312 lb-in-sec2 Analysis Assumptions and Modeling Notes
The length of the wire is arbitrarily selected. One rotational master degree of freedom at the disk is chosen. ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–112 VM47 Results Comparison
f, Hz ANSYS Ratio 0.63333 0.63333 1.00 ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–113 VM48: Natural Frequency of a Motor-Generator
Reference: W. T. Thomson, Vibration Theory and Applications, 2nd Printing, Prentice-Hall,
Inc., Englewood Cliffs, NJ, 1965, pg. 10, ex. 1.3-3 Analysis Type(s): Mode...
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