Test on the Influence of Geometric Parameters of an Annular Trench on the Vibration Isolation Area

Table 16

List of vibration isolation areas.

Test conditions	f (Hz)	A0.4 (m^2)	η	f (Hz)	A0.4 (m^2)	η	f (Hz)	A0.4 (m^2)	η
6-1	30	1.10	0.41	60	1.38	0.52	120	1.52	0.57
6-2		1.21	0.45		1.10	0.41		1.22	0.46
6-3		1.15	0.43		1.21	0.45		0.99	0.37
6-4		1.35	0.49		1.68	0.61		1.93	0.70
6-5		1.59	0.61		1.65	0.63		1.70	0.65
6-6		1.68	0.62		1.77	0.65		1.87	0.69
6-7		1.55	0.57		1.58	0.58		1.73	0.64
6-8		1.36	0.52		1.36	0.52		1.49	0.57
6-9		0.80	0.29		0.77	0.28		1.38	0.50
6-10		1.01	0.37		1.52	0.56		1.83	0.67
6-11		0.84	0.32		0.84	0.32		1.00	0.38
6-12		0.93	0.34		0.96	0.35		1.12	0.41

A_S,0.6 = 2.68 m², A_S,1.0 = 2.75 m², A_S,1.4 = 2.62 m², and A_S,1.8 = 2.72 m², where 0.6, 1.0, 1.4, and 1.8 represent the distance of source vibration (m).