A New Method to Calculate Additional Damping Ratio considering the Effect of Excitation Frequency

Table 1

Fitting coefficients of the polynomial for different ω values.

ω (rad/s)	Fitting coefficients
	b 1	b 2	b 3	b 4
2	0.23	–0.42	0.30	0.01
4	0.34	–0.86	0.80	0.01
5.39	0.40	–0.89	0.84	0.04
8	1.11	–2.39	1.81	0.04
10	1.76	–3.70	2.66	0.07
12	1.84	–3.99	3.04	0.08
14	1.19	–3.13	3.02	0.02
16	0.50	–2.00	2.73	0.00
18	0.14	–1.28	2.44	0.01
20	–0.05	–0.86	2.27	0.03