Maintaining Specific Natural Frequency of Damped System despite Mass Modification

Table 4

Stiffness values of different methods under different modal damping ratios.

Cases	Modal damping ratio of the second natural frequency (%)
Methods	0.84	1.66	2.52	3.39	4.24
Initial stiffness	2.202-0.329	1.871-1.129	1.464-1.432	1.075-1.574	0.745-1.614
Real method	2.202	1.871	1.464	1.075	0.745
Optimal selection method	2.202	1.871	1.464	1.075	0.745
Absolute value method	2.292	2.185	2.048	1.906	1.777