The paper presents a study of the flight dynamics of an articulated rotor helicopter carrying a suspended load. The aircraft model includes rigid body dynamics, individual flap and lag blade dynamics, and inflow dynamics. The load is a point mass with a single suspension point. Results were obtained for load masses of up to 2000 kg, with load-to-helicopter mass ratios of up to 28 %, cable lengths from 3 m to 8 m, turn rates of up to 16 deg/sec, and advance ratios of up to 0.3. The load affects trim primarily through the overall increase in the weight of the aircraft; the influence of cable length is negligible. Substantial coupling can occur between the Dutch roll and the load modes. Because of this coupling, the Dutch roll damping can decrease with a deterioration of handling qualities. The effects on the phugoid are very small. A suspended load modifies the roll frequency response by adding a notch to the gain curves and a 180-degree jump in the phase curves at the pendulum frequencies of the load. The changes in bandwidth and phase delay are small.
Flight dynamics of an articulated rotor helicopter with an external slung load
Die Flugdynamik eines Gelenkrotor-Hubschraubers mit einer externen Pendellast
Journal of the American Helicopter Society ; 46 , 1 ; 3-13
2001
11 Seiten, 20 Bilder, 1 Tabelle, 19 Quellen
Aufsatz (Zeitschrift)
Englisch
Hubschrauber , Rotor (Drehflügel) , Gelenk (Technik) , Flugeigenschaft , dynamisches Verhalten , Pendellast , Simulationsmodell , Einlaufströmung , Punktlast , Aufhängung , Vortrieb , Trimmen , Schwingungsdämpfung , Pendeln , Frequenzabhängigkeit , Rollen (Drehbewegung) , Bandbreite (Frequenz) , Phasenverzögerung
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