CIFER®-MATLAB Interfaces: Development and ... - Cal Poly

Figure 4.4: Mass-Spring-Damper System Input and Output
The frequency response of the simulation is shown in Figure 4.5 below. The natural frequency of
the mode occurs is almost 5 rad/s, which corresponds to the calculated value of 4.83 rad/s. The
case was also run from within CIFER ® for comparison to the MATLAB case, the results of which
are also shown in Figure 4.5, where the results overlay precisely. In addition, the CIFER ® results
were compared to the results from using the MATLAB ‘bode’ command on the transfer function
as shown in Figure 4.6. There is a slight difference found at the mode and at high frequency,
which correlates to the drop in coherence at those regions.
Figure 4.5: Matlab to CIFER ® Comparison
Figure 4.6: CIFER ® to ‘bode’ Comparison
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