Nonlinear Dynamics of an Electrorheological Sandwich Beam with Rotary Oscillation

Table 2

Comparison of a rotating beam for natural frequencies and modal damping ratio obtained herein with those of [26] (𝐿=300 mm, 𝑏=12.7 mm, ℎ₁=0.762 mm, ℎ₃=2.286 mm, ℎ₂=0.25 mm, 𝐺^∗₂=261500(1+0.38i)).

Angular velocity		Natural frequency		Modal damping ratio
𝜃̇ (r.p.m)		𝑓1 (Hz)	𝑓2 (Hz)	𝜂^∗1	𝜂^∗2
0	Ref.	20.15	104.0	0.0382	0.0235
	Present	20.14	103.9	0.0384	0.0233
600	Ref.	20.58	106.8	0.0365	0.0220
	Present	20.53	106.6	0.0366	0.0222
1000	Ref.	21.20	111.2	0.0340	0.0201
	Present	21.17	111.1	0.0340	0.0204