结构刚度对翼根螺栓组载荷分布的影响

 由于静不定结构中载荷按刚度分配，对于机翼翼根采用螺栓组连接的结构，其连接螺栓承受的载荷会随结构刚度变化。为考察螺栓载荷随结构刚度的分布特点，结合某新型地效飞行器的机翼结构分析工作，在PATRAN/NASTRAN环境下对该机在翼根附近的主要结构进行了有限元建模。主要研究了因机翼剖面形状导致翼根各处刚度不一致而对螺栓载荷分配造成的影响。另外，考虑到中央翼的桁条对提高其支持刚度也会起到一定作用，因此，比较了中央翼带桁条与不带桁条两种情况下螺栓的受力特性。通过局部模型的有限元分析，总结出一些螺栓载荷的变化规律。得出的结论对于类似的地效飞行器或轻型飞机翼根连接设计具有一定参考价值。

Effects of Structure Stiffnesses on the Load Distribution of Bolt Group at Wing Root

Load is distributed according to the stiffnesses in a statically indeterminate structure,so loads on the jointed-bolts at a wing root are vary with the different stiffnesses of the structure parts.Based on the wing structure analysis of a new kind of ground effect aircraft,the main structure near its wing root is modeled using PATRAN/NASTRAN software to observe the characteristics of bolts' load distribution affected by the stiffnesses.Because of the shape of airfoil,the stiffnesses at wing root are not uniform,and this paper mainly investigates their effects on the load distribution of the bolts.Considering the effects of stringers on the stiffness of central wing, load situations of the bolts are also compared when using a central wing with and without stringers.The regulation of bolts' load distribution is given out by the finite element analysis of the local model.And the conclusions are valuable for wing root joint designs such as those of ground effect aircraft or light airplane.