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

Table 10

Test arrangement for the parameter θ.

Test conditions	Excitation frequency (Hz)	Central angle θ (degrees)
4-1	30	90
4-2		120
4-3		150
4-4		180
4-5	60	90
4-6		120
4-7		150
4-8		180
4-9	120	90
4-10		120
4-11		150
4-12		180