Shear modulus and damping ratio change very little.

动剪切模量与阻尼比的变化比较小。

The objective function for GA takes damping ratio as its variable .

所得到的阻尼比作为大扰动下控制效果的评估指标。

The influence of consolidation stress ratio on damping ratio is not distinct.

但固结应力比与有效围压应力对阻尼比之影响则较不明显。

Third, a new structure of PID control reduces the damping ratio of the control system.

变结构的张力控制可以减小过程中的阻尼比的变化幅度，提高稳定性。

Dynamic damping ratio of frozen soil decreases with increment of frequency or decrement of temperature.

冻土的动阻尼比随频率的增加或温度的降低而减小。