When the rotating frequency f is equal to the

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Unformatted text preview: t c. Figure 86.1 Dynamic System Problem Sketch Material Properties W = 193 lb k = 200 lb/in c = 6 lb-sec/in Loading g = 386 in/sec2 F1 = 10 lb ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–196 VM86 Analysis Assumptions and Modeling Notes The mass of the machine is m = W/g = 0.5 lb-sec2/in. Hence the frequency of the disturbing force (f) becomes f = fn = sqrt(km)/2π = 3.1831 Hz. The node locations are arbitrarily selected. One master degree of freedom is selected at the mass in the force direction. Results Comparison Target Ao, in angle, deg ANSYS Ratio 0.0833 0.0833 1.000 -90.0 -90.0 1.000 ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–197 VM87: Equivalent Structural Damping Overview Reference: W. T. Thomson, Vibration Theory and Applications, 2nd Printing, Prentice-Hall, Inc., Englewood Cliffs, NJ, 1965, pg. 72, article 3.9 and pg. 56, ex. 3.1-2. Analysis Type(s): Reduced Harmonic Response Analysis (ANTYPE = 3) Element Type(s): Combination Elements (COMBIN40) Input Listing: vm87.dat Test Case Test ca...
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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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