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Results comparison target ymax in time sec ymin in

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Unformatted text preview: roperties m = 0.5 lb-sec2/in k1 = 200 lb/in Geometric Properties yo = 0.75 in Loading 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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