看了一个英文手册，上面说type选G时，gi的单位是等效黏性阻尼，有点懵逼了

crit=G/2

The values of fi and gi define pairs of frequencies and dampings. Note that gi can be entered as one of the following: structural damping (default), critical damping, or quality factor.
选择G实际上输入是结构阻尼，只是程序会自动转化为等效粘性阻尼