The material properties have no effect on the results

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Unformatted text preview: h ANSYS LS-DYNA Element Type(s): Explicit 3-D Structural Mass Elements (MASS166) Explicit Spring-Damper Elements (COMBI165) Input Listing: vme3.dat Test Case The one-DOF system consists of a spring, K, and mass, M, with viscous damping, C. There are two loading cases: • Case 1: f(t) = A = constant (step input) • Case 2: f(t) = At (ramp input) For this underdamped system, the displacement of M for Case 1 overshoots the steady-state static displacement. The overshoot and the peak time, tp are compared to theory outlined in C. M. Close, D. R. Frederick, Modeling and Analysis of Dynamic Systems. Based on the discussion in G. F. Franklin, J. D. Powell, A. Emami-Naeini, Feedback Control of Dynamic Systems, the mass velocity in response to the ramp input, in theory, is equal to the mass displacement due to the step input. Figure E3.1 Response of Spring-Mass-Damper System !¤©© ¨¦¤¡¢     § ¥ £ Material Properties Mass M = 1.0 kg Spring K = 4π2 N/m Damper C = 0.21545376 Geometric Prope...
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