Gust Response Analysis for Helicopter Rotors in the Hover and Forward Flights

Table 2

Modal frequency.

Rotating speed: 383 RPM
	This paper (Hz)	This paper (per/rev)	Paper [25] (per/rev)	Error (%)
Lag 1	4.79	0.75	0.747	0.5
Flap 1	7.33	1.15	1.146	0.9
Flap 2	21.7	3.44	3.389	1.5
Lag 2	27.1	4.24	4.315	−1.7
Twist 1	28.2	4.42	4.59	−3.8
Flap 3	46.2	7.24	7.416	−2.4
Twist 2	84.0	13.17	13.6	−3.1