Tethered UAV is composed of a UAV platform, tethered cable and winch. The UAV platform and tethered cable are an interactive whole, and the movement of the UAV platform will change the configuration and tension of the tethered cable. Under extreme external conditions (such as strong airflow) or unprofessional operation, the UAV platform will be prone to extreme movement, which will impact the tethered cable, and in serious cases, the tethered UAV will not work normally. To study the influence on the tethered UAV due to impact, equations for the relation between impact stress and impact parameters are derived and numerically solved to determine the dangerous area of the tethered UAV based on two failure criteria. The obtained results reveal that a smaller elastic modulus and cross-sectional area will lead to less failure of the tethered UAV, and the breaking strength of the cable is vital to the tethered UAV when it is impacted. Engineering suggestions are also provided to make tethered UAVs safer. INDEX TERMSTethered UAV; Impact; Dangerous Area 42 experiments. Then, he evaluated the impact process, 43 possible damaged components, and failure modes of the 44 UAV at different angles and speeds. The obtained results 45 showed that under certain angles and speeds, the UAV 46 would be irreparably damaged after being hit, and the 47 UAV battery would be at risk of fire [7]. Eamon T et al. 48 estimated the range of injury risks to humans due to the 49 unmanned aerial system (UAS) impact, and live flight 50 tests were observed to be less severe than falling impact 51 tests [8]. Meng et al. simulated the dynamic response of 52 the horizontal stabilizer during UAS airborne collision, 53 and the obtained results showed that the UAV impact at 54 the airliner cruising speed may cause some damage to
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