考虑随机参数影响的机翼力学性能数值模拟

Numerical simulation of wing mechanical properties considering random parameters

由于加工制造等过程中具有不确定性,导致机翼结构的尺寸、材料等参数具有随机性、分散性。本文采集了设计参数随机样本点,计算了每个样本点的相应结果,利用二次插值多项式构造,通过可靠性灵敏度分析可知弦长、翼展、弦厚比为机翼重要参数。通过力学性能数值模拟,表明了可靠性设计结果的优越性。最后通过计算算例得出,考虑参数随机性的影响获得的应力提高了5.72%,应变提高25.17%,形变降低4.05%,验证了本方法的有效性和可行性,为机翼的结构设计提供了一种科学可行的计算方法。

Due to the uncertainty in the process of manufacturing,the parameters such as the dimensions and materials of the wing structure are random and dispersive.In this paper,random sample points of design parameters are collected,and the corresponding results of each sample point are calculated.Using the quadratic interpolation polynomial structure,the reliability sensitivity analysis shows that the chord length,wingspan and chord-thickness ratio are important parameters of the wing.The numerical simulation of mechanical properties shows the superiority of reliability design results.Finally,the calculation results show that the stress obtained by considering the randomness of the parameters is increased by 5.72%,the strain is increased by 25.17%,and the deformation is reduced by 4.05%.The validity and feasibility of the method are verified,which provides the structural design of the wing.It provides a scientific and feasible calculation method for the structural design of wings.