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

Table 11

List of vibration isolation areas.

Test conditions	4-1	4-2	4-3	4-4	4-5	4-6	4-7	4-8	4-9	4-10	4-11	4-12
A0.4 (m^2)	0.58	1.05	1.70	1.84	0.83	1.10	1.89	2.00	1.24	1.68	1.95	2.12
η	0.21	0.38	0.62	0.67	0.30	0.40	0.69	0.74	0.45	0.61	0.71	0.77

A_S,0.2 = 2.75 m², where 0.2 represents the width of the trench (m).