关键词: 旋翼折叠机构, 六旋翼植保无人机, 轻量化设计, 静动态特性, 拓扑优化, 模态分析

Abstract:  In order to achieve the goal of easy folding and lightweight design of sixrotor plant protection UAV, the folding mechanism of sixrotor plant protection UAV was taken as the research object, and the static characteristics and modal analysis were carried out by using ANSYS Workbench finite element software. The static analysis results, the first six natural frequencies and corresponding vibration modes were obtained. Then the topology optimization was carried out to optimize the shape of the rotor folding mechanism. According to the topology optimization cloud image, the shape and size of the rotor folding mechanism were trimmed and the 3D model was reconstructed in SolidWorks. The optimized 3D model of the rotor folding mechanism was imported into ANSYS Workbench for static calculation and modal analysis. The results showed that the weight of the folding mechanism was reduced from 152.98 g to 14022 g, and the total weight of the sixrotor plant protection UAV was reduced by 76.56 g. The strength and stiffness of the new rotor folding mechanism were within the allowable stress range, and the mechanism will not resonate in operation, which determined the feasibility of topology optimization.

Key words: folding mechanism, sixrotor plant protection UAV, lightweight design, static and dynamic characteristics, topology optimization, modal analysis