Damping Evaluation of Linseed Oil-Based Engineering Elastomers by Vibration Response Method

Table 5

Vibration damping characterization results of elastomers and sandwiched beam under forced vibration.

SET	Core material of sandwiched beam	Mode of vibration (𝑛)
		2nd mode						3rd mode
		𝑓𝑠^a (Hz)	Δ𝑓𝑠^b (Hz)	𝜂𝑠^c	𝜂1^d	𝜂^e	𝐺1^f×10^7 (Pa)	𝑓𝑠^a (Hz)	Δ𝑓𝑠^b (Hz)	𝜂𝑠^c	𝜂1^d	𝜂^e	𝐺1^f×10^7 (Pa)
I	S1Lin45	277	70	0.252	0.43	—	94	775	192	0.25	0.43	—	250
	S2Lin50	271	66.5	0.245	0.49	—	63	762	188	0.246	0.53	—	149
	S3Lin55	252	60	0.238	0.71	—	40	692	172	0.25	0.77	—	110
	S4Lin60	239	44.5	0.19	1.03	—	14	672	120	0.25	0.99	—	38
II	S5Lin50	279	75	0.27	0.37	0.37	156	778	218	0.28	0.45	0.32
	S6Lin55	272	73	0.27	0.53	0.50	64.7	752	212	0.28	0.54	0.36	201
	S7Lin60	258	71	0.28	0.71	0.82	36	732	208	0.28	0.74	0.66	98.6
	S8Lin65	252	70	0.28	0.89	—	23.6	712	196	0.28	0.99	—	53

aNatural frequency of vibration, ^bBandwidth, ^cSystem loss factor, ^dLoss factor of core elastomeric materials, ^eloss factor of elastomers from dynaic mechanical analysis, ^fShear modulus of core elastomeric materials.