Vibration Characterization and Improvement of Small Multi-Rotor UAVs
In order to improve the resonance phenomenon in the flight test of a small multi-rotor unmanned aerial vehicle(UAV),this paper systematically analyzes the modal and harmonic response vibration characteristics of the UAV,and carries out the optimization and improvement of the composite material layup scheme from the arm layup structure.Through the simulation results,it can be found that the change of the positive and negative directions of the 45° pavement angle and the 0° pavement position has an extremely weak effect on the vibration characteristics,which can be ignored.However,the change of neutral plane has a significant effect on the frequency and amplitude,and the overall vibration characteristics are significantly improved when the neutral plane is 0° pavement.And the different neutral surface schemes all show the pattern of gradual rightward shift of frequency and gradual decrease of amplitude with the increase of the number of 0 ° pavements.Therefore,in order to optimize the vibration characteristics of this and similar configurations of multi-rotor UAVs,it is recommended to give priority to the selection of 0 ° neutral surface pavement and to reasonably increase the number of 0° pavement layers(3～4 layers are appropriate).
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