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Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations
The present study using active vibration control system (AVCS) attempts to actively reduce the airframe vibration responses of a lift-offset compound helicopter at 250 knots. An 11% scaled airframe structure of the Sikorsky X2 Technology Demonstrator (TD) is used for the AVCS test and simulation and this small-scale airframe model is designed and manufactured based on the one-dimensional (1D) stick structure. The present AVCS comprises two force generators for producing vibration cancellation forces, two accelerometers to measure 4P vertical vibration responses at the pilot and copilot seats, and the filtered-x least mean square (Fx-LMS) algorithm as a closed-loop feedback controller. MATLAB Simulink is used to construct the AVCS framework for both tests and simulations. MSC.NASTRAN is applied to the dynamic design of a small-scale airframe structure and to predict of its airframe vibration responses in a simulation study. The dSPACE MicrolabBox equipment is used for the AVCS test. When the AVCS is applied to the present X2TD scaled airframe model, the 4P vertical vibration responses in the test are reduced by 68.57% and 60.24% compared to the baseline without AVCS at the pilot and copilot seats, respectively, whereas they are reduced by 70.89% and 64.11%, respectively, in the simulation. Finally, the vertical vibration reduction rates between the AVCS test and simulation are similar, and it is investigated that the vibration reduction performance is good in both the AVCS test and simulation.
International Journal of Aeronautical and Space Sciences – Springer Journals
Published: Feb 1, 2023
Keywords: Lift-offset compound helicopter; X2 technology demonstrator; Small-scale airframe model; Active vibration control system
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