A Method of Modal Parameter Identification for Wind Turbine Blade Based on Binocular Dynamic Photogrammetry

Table 1

The recognition results of blade’s modal frequencies.

Mode	Measurement method
	Frequency (Hz)
	Proposed method	Impact test	Relative error (%)
First order	4.42	4.28	3.2
Second order	11.4	11.76	−3.1
Third order	28.23	29.01	−2.7