This preview shows page 1. Sign up to view the full content.
Unformatted text preview: ξ = 0.7 respectively. A static solution is done at the first load step. The final time of 0.105
sec allows the masses to reach their largest deflections. One master degree of freedom (MDOF) is selected at
each mass in the spring direction. The integration time step (0.0025 sec) is based on ≈ 1/120 of the period to allow ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–169 VM74
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
Target Ratio y,max in 0.99957 0.99523 0.996 y, in (for damping ratio = 0.0) 0.90930 0.92469 1.017 y, in (for damping ratio = 0.07) Time = 0.08 sec ANSYS 0.34180 0.35167 1.029 Damping ratio = 0.0
Time = 0.1 sec 1. 1–170 Based on time = 0.1 + 0.0025 sec to account for finite impulse duration of 0.0025 sec. ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. VM75: Transient Response to a St...
View Full Document
- Spring '09
- The Land