COMPUTATION OF A LOWER BOUND OF Umax
This subsection compares the results obtained with the three methods proposed in chapter 5 (section 3.). A rough frequency gridding is first considered. The three methods are then evaluated around the critical frequency.
6.1.1 USE OF A ROUGH FREQUENCY GRIDDING
Table 10.1. /1 Lower bounds.
The frequency gridding is chosen as a set of 30 points logarithmically spaced between 0.01 rad/s and 100 rad/s. The results are presented in the above table. It is especially worth emphasizing that methods (1) and (2) only detect a single peak, while the third method, which is based on Linear Programming, detects the two most critical peaks (these ones also appear in Figure 10.4).