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针对大飞机数字化装配工艺需求,设计一种工艺接头用于定位器与机身之间的过渡连接.为了保证飞机装配质量,对机身工艺接头的承载能力和机身受力状态进行有限元建模和分析.采用带耦合约束的梁单元模拟螺栓受力,分析机身与螺栓的载荷分布情况.分析结果表明,机身与工艺接头之间的接触应力较小,机身隔框上的最大应力只有螺栓孔区域应力的1/3.各螺栓的受载情况差别较大,且有较大的轴向载荷作用.分析工艺接头的结构特征和设计参数对螺栓载荷分布的影响,总结了一些螺栓载荷分布规律:布置在隔框周向边缘的螺栓径向载荷较大,在加载位置附近的螺栓轴向载荷较大;增加机身连接面板的厚度能够使螺栓的受载均匀化,增加螺栓数量可以减小螺栓的径向载荷,对轴向载荷的影响不显著.
Aiming at the requirements of large aircraft digital assembly process, a kind of process joint is designed for the transition connection between locator and fuselage.In order to ensure the assembly quality of aircraft, the bearing capacity of fuselage process joint and the mechanical state of fuselage are finite element built Mode and analysis.A beam element with coupling constraint was used to simulate the bolt force and the load distribution of the fuselage and bolt was analyzed.The analysis results show that the contact stress between the fuselage and the process joint is small and the maximum The stress is only 1/3 of the stress in the bolt hole area, and the loading conditions of the bolts are quite different with larger axial loads.The structural characteristics of the process joint and the influence of the design parameters on the bolt load distribution are analyzed, and some conclusions are drawn Bolt load distribution: the bolt placed in the circumferential edge of the frame radial load larger, near the loading position of the bolt axial load larger; increase the thickness of the fuselage connection panel can load the bolts uniform, increase the bolt The number of bolts can reduce the radial load, the axial load is not significant.