Comparison of Tiltrotor Whirl Flutter Analyses with Gimballed and Hingeless Hub Models

This study investigates and compares the whirl flutter characteristics of two different hub models, gimballed and hingeless hubs, for the tiltrotor aircraft in cruise flight. This study uses the rotorcraft comprehensive analysis code, CAMRAD II, to model the proprotor, semi-span wing, and pylon, and...

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Bibliographic Details
Published in:International journal of aeronautical and space sciences 2024, 25(4), , pp.1310-1318
Main Authors: Hwang, Ui-Jin, Park, Jae-Sang, Lee, Myeong-Kyu
Format: Article
Language:English
Subjects:
Aerospace Technology and Astronautics
Engineering
Fluid- and Aerodynamics
Original Paper
항공우주공학
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Summary:This study investigates and compares the whirl flutter characteristics of two different hub models, gimballed and hingeless hubs, for the tiltrotor aircraft in cruise flight. This study uses the rotorcraft comprehensive analysis code, CAMRAD II, to model the proprotor, semi-span wing, and pylon, and to investigate the whirl flutter instability. The two analytical tiltrotor models are based on two proprotors developed by the U.S. Army/NASA, and KARI. The proprotor frequency characteristics depend on the hub type and have influence on the wing-rotor interaction to cause whirl flutter. In addition, it is shown that the rotor regressive lag mode frequency is an important system design parameter for a hingeless tiltrotor, whereas the rotor regressive gimbal mode is important for a gimballed tiltrotor.
ISSN:2093-274X
2093-2480
DOI:10.1007/s42405-024-00728-2