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十公斤级固定翼无人机全碳纤维机翼设计与应力分析
刘峰1,代海亮1,王坤1,高鸿渐1
中国民用航空飞行学院航空工程学院,广汉 618307
摘要:
根据轻型固定翼无人机性能要求,设计了一款最大起飞结构质量为10 kg、质量轻、强度高、刚度高的固定翼无人机全碳纤维机翼;基于气动性能分析和结构几何设计,建立了机翼结构的三维模型;采用“封闭矩形截面缘条”盒式梁结构,增大了机翼的扭转刚度;建立了机翼结构有限元模型,采用最大应力强度准则,对机翼结构的强度、刚度、稳定性进行了校核。对蒙皮碳纤维铺层结构进行了优化。结果表明,结构应力集中区域位于翼梁根部螺栓孔区域,该区域应力水平决定了结构的初始强度;机翼大梁上缘条根部和附近的蒙皮易发生屈曲;优化后蒙皮减重121.6 g,占机翼初始结构质量的11.94%。
关键词:  机翼  无人机  有限元  碳纤维  结构设计  优化
DOI:10.12044/j.issn.1007-2330.2019.04.010
分类号:V215
基金项目:民航教育项目《航空航天工程 直升机维修与工程 ; 本科新专业建设 14002600100017J71 民航教育项目《航空航天工程(直升机维修与工程)》;本科新专业建设(14002600100017J71)
Design and Stress Analysis of Full Carbon Fiber Wing of 10kg Fixed-Wing UAV
LIU Feng1,DAI Hailiang1,WANG Kun1,GAO Hongjian1
Aviation Engineering Institute,Civil Aviation Flight University of China, Guanghan 618307
Abstract:
Based on performance requirements, the wing of a light fixed-wing UAV(unmanned aerial vehicle)constructed by full carbon fiber reinforced epoxy is designed with features of light weight, high strength,high stiffness and maximum take-off structural mass of 10 kg. The three dimensional structure model of the wing is created based on aero-dynamic performance analysis and geometry design. The "closed rectangular cross-section caps" is adopted in the box-type wing spar, which increases the anti-twisting ability of the wing structure. The finite element model of the wing structure is established. Based on the strength criterion of maximum stress, the strength of the wing structure is checked. The stiffness and stability of the wing structure is also checked. It is show that stress concentration occurs in the wing root area of bolt holes, and the initial strength of the wing is determined by the stress state of this area. Buckling may occur on the spar cap section at the wing root and the skin around under bending load. The laminate structure of the skin is optimized. The weight of the wing skin decreases by 121.6 gram after optimization, about 11.94% of initial structural mass of the wing.
Key words:  Win  UAV  Finite element  Carbon fiber  Structure design  Optimization