Flutter Test Data Processing Based on Improved Hilbert-Huang Transform

Table 4

Changes in modal parameters with wind speed.

airspeed; (km/h)	Natural frequency (Hz)		Damping ratio (%)
600	0.415	3.315	7.521	2.239
650	0.347	4.235	53.51	4.175
700	0.375	4.552	21.72	3.721
730	0.647	4.731	12.37	3.109
760	0.524	4.679	32.73	2.829
780	0.672	5.044	23.15	2.222