Developement Of A Batch Mode For Conduit And Its ... - Cal Poly

simply because the system is not a second order system. Finally, if the system is
overdamped, no peaks can be found to make a calculation, thus an arbitrary value of –1 is
assigned, shown as the arrow on the real axis. Thus, because of the problems with this
spec in determining the damping ratio, and that the results will jump in their value when
overdamped (and remain at that value regardless of the actual overdamped value), the
damping ratio spec is a weakly driving spec in an optimization.
Therefore, the robustness plots can also be used to identify specs which only
weakly drive the optimization. After discovering a weak spec, it could then be replaced
with a stronger spec. In this case, however, there was no alternative.
The remainder of the specs vary to some degree, but they do not come close to
violating the Level 1 ratings. The Eigenvalues spec does not change at all, as the
variation in parameters does not cause instability.
3.4.6 Conclusions of the Robustness Plot Capability
Several things have been shown in the demonstration of the Robustness capability
of Analysis Mode. First, it showed how the system could be checked for robustness.
Second, it showed how the violations of the Level 1 region could be used in the redesign
of the problem, using the minimum increase in design margin. Finally, it was shown that
the robustness plots could be used to find weak optimization specs.
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