Tiltrotor Vibration Load Reduction Based on Higher Harmonic Control
To study the dynamic issue of a tiltrotor aircraft,an analytical method was established for the tiltrotor-fuselage coupled model. Based on the generalized Kalman filter method and optimal control the-ory,the application study of the higher harmonic control(HHC) in the vibration reduction of a tiltrotor was conducted,the control process and control strategy were constructed. Taking XV-15 as an example,the closed-loop vibration control on a tiltrotor was simulated through HHC method. The results show that 3Ω hub loads were significantly reduced with a transfer matrix on-line identification,the maximum and minimum reduction are respectively 90％ and 18％.When HHC control was applied to the tiltrotor,the blade lift of the outboard section showed a significant change with rotor azimuth. It can indicate that the vibration control effect mainly comes from the reduction of the high-frequency aerodynamic force.
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