基于正交设计、组合权重-灰色关联的Ω夹层蒙皮抗鸟撞优化设计

Optimization Design Forbird-Strike Resistant of Ω-Shaped Sandwich Skin Based on Orthogonal Experimental Method and Grey Relational Analysis

为提高Ω形夹层蒙皮的抗鸟撞特性,作者以Ω形夹层蒙皮的Ω半径、外蒙皮厚度、Ω夹层厚度为影响因素,以蒙皮吸能特性、外蒙皮最大位移、外蒙皮最大应力为评价指标,设计了三因素四水平的正交试验。采用组合赋权法和灰色关联法处理有限元试验的数据,获得了优化设计的最优参数组合。Ω半径10 mm、外蒙皮厚度2 mm、Ω夹层厚度3 mm、内蒙皮厚度4.22 mm组合为最优方案。将最优组合与4 mm单蒙皮对比,其蒙皮吸能特性提高24.1%;外蒙皮最大位移减少37.9%;外蒙皮最大应力减少1.08%。。

In order to improve the bird-strike resistant of Ω-shaped sandwich skin,a series numerical experiments were performed using four-factor and three-level orthogonal method in this paper. The effect of radius of Ω-shaped skin,the thickness of outer skin and Ω-shaped middle skin on the energy absorption ability,the maximum displacement and stress of the outer skin were detailed investigated. The optimum combination of parameters were obtained from the simulations results which were analyzed with combination weighting and gray correlation method. The results showed that the sandwich structures with 2 mmthickness of outer skin,4. 22 mm-thickness of inner skin,3 mm thickness and 10 mm-radius Ω-shaped middle skin performs the best. Compared with the typical single layer skin with a thickness of 4 mm,the sandwich structures with the optimum combination of parameters improve the energy absorption ability by24. 1%,reduce the maximum displacement and stress of the outer skin by 37. 9% and 1. 08%,respectively.