Test on the Influence of Geometric Parameters of an Annular Trench on the Vibration Isolation Area
Table 14
List of vibration isolation areas.
Test conditions
f (Hz)
A0.4 (m2)
η
f (Hz)
A0.4 (m2)
η
f (Hz)
A0.4 (m2)
η
5-1
30
0.66
0.20
60
0.73
0.22
120
1.00
0.30
5-2
0.79
0.25
0.78
0.26
1.02
0.33
5-3
0.80
0.29
0.77
0.28
1.38
0.50
5-4
1.29
0.39
1.49
0.45
1.52
0.46
5-5
1.42
0.43
1.59
0.48
1.56
0.47
5-6
1.64
0.53
1.41
0.46
1.74
0.56
5-7
1.05
0.38
1.10
0.40
1.68
0.61
5-8
1.71
0.55
1.80
0.58
1.74
0.56
5-9
1.35
0.49
1.68
0.61
1.93
0.70
5-10
1.04
0.36
1.09
0.39
1.43
0.53
5-11
1.47
0.61
1.51
0.63
1.57
0.65
5-12
1.48
0.61
1.57
0.65
1.68
0.69
AS,0.1 = 2.42 m2, AS,0.2 = 2.75 m2, AS,0.3 = 3.10 m2, and AS,0.4 = 3.31 m2, in which 0.1, 0.2, 0.3, and 0.4 represent the width of the trench (m); f represents the excitation frequency.
