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

Table 5

List of vibration isolation areas.

Test conditions	1-1	1-2	1-3	1-4	1-5	1-6	1-7	1-8	1-9	1-10	1-11	1-12
D	0.08	0.14	0.19	0.25	0.16	0.27	0.38	0.49	0.33	0.55	0.76	0.98
A0.4 (m^2)	0.80	1.05	1.35	1.05	0.77	1.10	1.68	1.60	1.38	1.68	1.93	1.98
η	0.29	0.38	0.49	0.38	0.28	0.40	0.61	0.58	0.50	0.61	0.70	0.72

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