A passive vibration reduction device in which the conventional main rotor blade pitch link is replaced by a spring/damper element is investigated using a comprehensive rotorcraft analysis code. A case study is conducted for a modern articulated helicopter main rotor. Correlation of vibratory pitch link loads with wind tunnel test data is statisfactory for lower harmonics. Inclusion of unsteady aerodynamics had little effect on the correlation. In the absence of pushrod damping, reduction in pushrod stiffness from the baseline value had an adverse effect on vibratory hub loads in forward flight. However, pushrod damping in combination with reduced pushrod stiffness resulted in modest improvements in fixed and rotating system hub loads.
Dynamically tuned blade pitch links for vibration reduction
Eine dynamisch gesteuerte Vorrichtung zur Rotorblattanstellung mit Schwingungsreduzierung
Forum, Annual Forum, American Helicopter Society, 50 ; 1 ; 347-359
1994
13 Seiten, 13 Bilder, 2 Tabellen, 12 Quellen
Conference paper
English
Higher harmonic blade pitch control : a system for helicopter vibration reduction
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