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

0.50

0.65

0.80

0.95

1.10

1.25

Frequency (Hz)

1.3028

1.3033

1.3039

1.3044

1.3049

1.3055

Damping ratio (%)

5.82

5.92

5.99

6.04

6.08

6.12

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

1.40

1.55

1.70

1.85

2.00

Frequency (Hz)

1.3057

1.3061

1.3063

1.3067

1.3069

Damping ratio (%)

6.13

6.16

6.17

6.18

6.19