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Unformatted text preview: y) = (9.975,0) for convenience. Results Comparison
Target ANSYS Ratio fo, Hz 3226.4 3226.4 1.000 f2, Hz 12.496 12.496 1.000 ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–155 VM68: PSD Response of a Two DOF Spring-mass System
Reference: R. K. Vierck, Vibration Analysis, 2nd Edition, Harper & Row Publishers, New York,
NY, 1979, sec. 7-2, 7-14. Analysis Type(s): Mode-frequency Analysis (ANTYPE = 2)
Spectrum Analysis (ANTYPE = 8) Element Type(s): Combination Elements (COMBIN40) Input Listing: vm68.dat Test Case
Determine the first two natural frequencies, f1 and f2, and the response of a damped two degree of freedom
system subject to a random acceleration with a spectral density function as shown in the figure below. Figure 68.1 DOF Spring-mass System Problem Sketch Material Properties
k1 = 42832 lb/in
k2 = 32416 lb/in
m1 = 0.5 lb-sec2/in
m2 = 1.0 lb-sec2/in Analysis Assumptions and Modeling Notes
The load is applied at node 1 to simulate base excitation. A 2% constant modal damping is...
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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.
- Spring '09
- The Land