Effect of Lift-offset Rotor Hub Vibratory Load Components on Airframe Vibration Responses of High-Speed Compound Unmanned Rotorcrafts

Abstract

This paper investigates numerically the effect of rotor hub vibratory load components on the airframe vibration responses of high-speed compound unmanned rotorcraft (HCUR) using a lift-offset coaxial rotor, wings, and two propellers. The rotor hub vibratory loads are predicted using a rotorcraft comprehensive analysis code, CAMRAD II, and the airframe vibration responses are calculated by a finite element analysis software, MSC.NASTRAN. It is shown that the vibratory hub pitch moment of a lift-offset coaxial rotor is the most dominant component for both the longitudinal and vertical vibration responses at four specified locations of the airframe. Keywords: HCUR, Lift-offset ë™ì¶•ë°˜ì „ 로터, 로터 진동 하중, 기체 진동 응답 Keywords: High-speed Compound Unmanned Rotorcraft, Lift-offset Coaxial Rotor, Rotor Hub Vibratory Loads, Airframe Vibration Responses