Bionic Scorpion-Tail Flying Arm Structure Optimization and Cross-Section for Aerial Work Vehicles

To solve the problem of large self-weight and insufficient bending stiffness of the flying arm of aerial vehicle, based on the principle of biomimetics, an improved scheme of multi-joint flying arm with biomimetic scorpion-tail structure is proposed, and the lightweight design is realized by combining the multi-objective optimization strategy of cross section. First, according to the multi-step series and joint characteristics of the scorpion-tail, the structure of two joints and three flying arms is designed, and its bending resistance and stability are verified by static-dynamic numerical analysis. Secondly, under the constraint of ISO safety standard, the section parameters are optimized by multiple objectives to achieve 65% increase of bending modulus under the condition of slight mass increase (6.8%). Finally, through multibody dynamics and numerical analysis, the safety factor and dynamic response of the optimized boom in multi-attitude (pitch 0°~10°, roll ± 10°) and different angular accelerations (1 – 3 rad/s ²) are studied. The results show that the improved boom not only meets the dual requirements of stability, bending resistance and lightweight, but also significantly improves the bearing capacity and dynamic response speed of the boom, which provides a new idea for the design of the boom.