The results show that the amplitude of the stress signal is the best sensitive to the change of damage among the parameters and it will gradually decay with the increase of damage degree.
结果表明，信号幅值对裂缝损伤的变化最为敏感，且随损伤程度的不断增加呈现出不断衰减的趋势。
2
The stability criteria and the decay time constant of the nutation damping are obtained in an analytical form, by which the degree of the attitude stability can bd evaluated.