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

Table 9

Test-case 2: original and modified systems without and with robustness: percentage variation of the second antiresonance frequency of h₁₂(jω).

Percentual variations (%) [Δm5; Δ ]	Original system Δωz,2 (%)	Mod. nonrobust (method [22]) Δωz,2 (%)	Mod. robust (proposed method) Δωz,2 (%)
[−25; −25]	0.04	−0.35	−0.27
[+25; −25]	−9.24	−7.35	−5.76
[−25; +25]	6.21	4.68	3.77
[+25; +25]	−0.03	0.30	0.24
max (Δωz,2(%))	6.21	4.68	3.77
min (Δωz,2(%))	−9.24	−7.35	−5.76