${T^{\prime }}_{\text{q0}}$ (s)

0.50

0.65

0.80

0.95

1.10

1.25

Frequency (Hz)

1.162

1.153

1.160

1.212

1.137

1.174

Damping ratio (%)

19.826

20.667

21.922

20.643

23.690

20.886

${T^{\prime }}_{\text{q0}}$ (s)

1.40

1.55

1.70

1.85

2.00

Frequency (Hz)

1.137

1.188

1.187

1.200

1.124

Damping ratio (%)

23.974

21.453

21.711

20.818

24.803