Fig. 3

The FEM: (a) initial simplified model; (b) the boundary condition (This figures were partially created with WPS 365 Education Edition 12.1, https://365.wps.cn/edu/home/).
The FEM: (a) initial simplified model; (b) the boundary condition (This figures were partially created with WPS 365 Education Edition 12.1, https://365.wps.cn/edu/home/).