Vibratory loads behavior of a high-speed lift-offset coaxial rotor system

A numerical simulation is performed to investigate the blade loads and hub vibration behavior of an unmanned, coaxial compound lift offset (LO) helicopter, which will undergo future construction. The vehicle has a gross weight of 2365 kg, two-bladed counterrotating hingeless rotors, a main wing, and...

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Bibliographic Details
Published in:Journal of mechanical science and technology 2022-11, Vol.36 (11), p.5425-5436
Main Authors: Hong, Seong H., Bae, Jae S., Jung, Sung N., Kim, Do-Hyung
Format: Article
Language:English
Subjects:
Aeromechanics
Control
Design optimization
Dynamical Systems
Engineering
Evolutionary algorithms
Helicopters
Industrial and Production Engineering
Mechanical Engineering
Original Article
Rigid rotors
Structural design
Vibration
Vibration control
Vibration measurement
Vibration response
Vibratory loads
Wing tips
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Summary:A numerical simulation is performed to investigate the blade loads and hub vibration behavior of an unmanned, coaxial compound lift offset (LO) helicopter, which will undergo future construction. The vehicle has a gross weight of 2365 kg, two-bladed counterrotating hingeless rotors, a main wing, and auxiliary propulsions installed at the wing tips. The blade structures are newly designed, using the known configuration data of XH-59A blades. An inhouse structural design optimization framework based on an evolutionary algorithm is employed to systematically search for the best optimal combinations of objective functions while meeting all design constraints set from static and structural dynamics perspectives of the vehicle. The resulting blade properties of the optimized structure are correlated with those of XH-59A. An aeromechanics analysis of the coaxial LO rotor is also validated against the flight test data. The present vibratory hub moment predictions indicate reasonable agreements with the measured data of XH-59A. The trim, loads, and vibration responses are examined while varying the LOs for an isolated coaxial LO rotor. The LOs are shown to play significant roles in decreasing the hub vibration level. The physical mechanism leading to the reduced vibration is identified in the context of the present investigation.
ISSN:1738-494X
1976-3824
DOI:10.1007/s12206-022-1008-7