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Dynamic Time Response Analysis Problem
This chapter contains a dynamic time response analysis problem and Creo Simulate's results. In a dynamic time response analysis, Structure calculates the response of your model to time-varying loads. Structure also automatically calculates all predefined measures. This list of measures differs based on the analysis type.
mvst001: 3D Mass-Spring-Damper System
Analysis Type:
Dynamic Time Response
Model Type:
3D
Comparison:
ANSYS No. 74
Reference:
Thomson, W.T. Vibration Theory and Applications. NJ: Prentice-Hall, Inc. 2nd printing, 1965. p. 99, Article 4.1.
Description:
A mass-spring system is subjected to an impact load, and thereafter undergoes free vibration. Determine the deflection at time t = 0.1 sec for a damped and undamped system.
Specifications
Element Type:
mass (1), spring (1)
Units:
IPS
Dimensions:
spring length: 10 (arbitrary)
Mass Properties:
M: 0.5
Mxx: 0
Mxy: 0
Mxz: 0
Myy: 0
Myz: 0
Mzz: 0
Spring Properties: (extensional stiffness)
Kxx: 200
Kxy: 0
Kxz: 0
Kyy: 0
Kyz: 0
Kzz: 0
Constraints:
placed on point A: fixed in all DOF
placed on point B: fixed in all DOF except TransY
Loads:
placed on point B: FY = 10
Distribution: N/A
Spatial Variation: N/A
Comparison of Results Data
Theory
ANSYS
Structure1
% Difference
Max Deflection @ t = 0.1 (a=undamped)
0.909297
0.90693
0.909297
0.0%
Max Deflection @ t = 0.1 (a=damped, damping=70%)
0.3418
0.34252
0.3418
0.0%
Convergence %: 0.0% on Frequency
Max P: N/A
No. Equations: 1
1 You cannot view the results information in the summary file. To view the results, you must define a displacement result window and query the result at t = 0.1.