3.3.1. Blades

The mode shapes used in the structural model are the first and second flap-wise modes, and the first edge-wise mode. Natural frequencies and mode shape comparisons are shown in Table 1.


**Table 1.** Natural frequencies of the blade.

Results of the natural frequencies from the Modes simulation agree with the reference values In Figures 6 and 7, the mode shapes calculated by Modes are compared to the mode shapes in the NREL 5MW definition file. The results are almost identical for both the flap-wise and edge-wise modes.

**Figure 6.** Blade flap-wise mode shapes.

**Figure 7.** Blade edge-wise mode shape.
