Robust Assignment of Natural Frequencies and Antiresonances in Vibrating Systems through Dynamic Structural Modification

Table 13

Test-case 3: original and modified systems: percentage variation of the third natural frequency.

Percentual variations (%) [Δk1; Δk2; Δk3]	Original system Δωp,3 (%)	Mod. robust (proposed method) Δωp,3 (%)
[−25; −25; −25]	−10.92	−5.62
[+25; −25; −25]	−9.11	−4.69
[−25; +25; −25]	0.42	−0.15
[+25; +25; −25]	3.70	1.44
[−25; −25; +25]	−9.11	−4.69
[+25; −25; +25]	−6.78	−3.35
[−25; +25; +25]	3.70	1.44
[+25; +25; +25]	9.36	4.54
max (Δωp,3(%))	9.36	4.54
min (Δωp,3(%))	−10.92	−5.62