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http://dx.doi.org/10.9766/KIMST.2021.24.4.357

Active Airframe Vibration Control Simulations of Lift-offset Compound Helicopters in High-Speed Flights  

Hong, Sung-Boo (Department Aerospace Engineering, Chungnam National University)
Kwon, Young-Min (Mechanical Design Team, Fundamental Technology Research Center, Hanwha Systems)
Kim, Ji-Su (Department Aerospace Engineering, Chungnam National University)
Lee, Yu-Been (Department Aerospace Engineering, Chungnam National University)
Park, Byeong-Hyeon (Department Aerospace Engineering, Chungnam National University)
Shin, Hyun-Cheol (Department Aerospace Engineering, Chungnam National University)
Park, Jae-Sang (Department Aerospace Engineering, Chungnam National University)
Publication Information
Journal of the Korea Institute of Military Science and Technology / v.24, no.4, 2021 , pp. 357-367 More about this Journal
Abstract
This paper studies the simulations of active airframe vibration controls for the Sikorsky X2 helicopter with a lift-offset coaxial rotor. The 4P hub vibratory loads of the X2TD rotor are obtained from the previous work using a rotorcraft comprehensive analysis code, CAMRAD II. The finite element analysis software, MSC.NASTRAN, is used to model the structural dynamics of the X2TD airframe and to analyze the 4P vibration responses of the airframe. A simulation study using Active Vibration Control System(AVCS) with Fx-LMS algorithm to reduce the airframe vibrations is conducted. The present AVCS is modeled using MATLAB Simulink. When AVCS is applied to the X2TD airframe at 250 knots, the 4P longitudinal and vertical vibration responses at the specified airframe positions, such as the pilot seat, co-pilot seat, engine deck, and prop gearbox, are reduced by 30.65 ~ 94.12 %.
Keywords
Active Vibration Control System; Fx-LMS Algorithm; X2 Technology Demonstrator; Lift-offset Rotor;
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