Unformatted text preview: roperties
m = 0.5 lb-sec2/in
k1 = 200 lb/in Geometric Properties
yo = 0.75 in
see time history in Figure 79.1: “Bilinear Spring Assembly Problem
Sketch” ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–179 VM79 Analysis Assumptions and Modeling Notes
The node locations are arbitrarily selected. The final time of 0.105 sec allows the mass to reach its largest deflection.
A static solution is done at the first load step. A gap condition with a spring constant of -k1 is applied in parallel
with k1 to produce a combined spring stiffness of zero at gap closure. One master degree of freedom (MDOF) is
selected at the mass in the spring direction. The integration time step (0.0025 sec) is based on ≈ 1/125 of the
period to allow the step changes in acceleration to be followed reasonably well and to produce sufficient printout
for the theoretical comparison. The impulse is applied over 1 integration time step. Results Comparison
Time = 0.09 sec ANSYS Ratio -1.041...
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