Standards Development
The proposed method consists of three categories. The first is to measure the frequency of the rotor. The second is to measure the natural frequencies and natural modes of the multi-copter UAV. The third is to analyze the range of frequency that is overlapped by the two measured frequency spectrums. The frequency measurement of the rotor is performed by fixing the UAV firmly at a certain height and then increasing the throttle of UAV from 0 to the maximum value, measuring frequencies with a microphone. The natural frequencies of the multi-copter UAV are determined by fixing it in the air and measuring the natural frequency and natural mode using an impact hammer. It is designed to find out overlapping frequency range by checking the range of the frequency of the UAV and the frequency of the rotor rotation in order to give UAV designers instructions to avoid hazardous resonance of design.
The relevant standard deals with measuring local frequencies to prevent resonance due to the excitation frequencies and natural frequencies of the multi-copter UAV by rotors. The exciting force that applies vibration to the multi-copter UAV is created by very small amount of mass or shape imbalance of the rotor. If the resonance frequency of the excitation and the resonance frequency of the rotor are caused by the rotation of the rotor, serious damage may occur or may be more severe. In order to solve this problem, proposed is a new method to measure resonance frequency of the rotor and the natural frequency of the multi-copter UAV in order to find out the solutions of avoiding resonance ranges.
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