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典型薄壁结构抗鸟撞动响应试验及数值模拟研究

Experimental and numerical simulation study on the bird impact responses of typical thin-walled structures

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【作者】 李振华刘军

【Author】 LI Zhenhua;LIU Jun;School of Aeronautics, Northwestern Polytechnical University;

【通讯作者】 刘军;

【机构】 西北工业大学航空学院

【摘要】 设计满足鸟撞适航条款要求的飞机薄壁结构,必须进行典型薄壁结构抗鸟撞动响应试验及数值模拟研究。对某飞机机头上壁板薄壁结构进行了鸟撞试验,并采用光滑粒子流体动力学-有限元法(smoothed particle hydrodynamics-finite element method, SPH-FEM),基于商用显式有限元分析软件PAM-CRASH,建立了鸟撞上壁板薄壁结构数值计算模型。计算结果表明,上壁板结构损伤模式主要包括蒙皮撕裂和铆钉断裂,计算结果与试验结果良好的一致性验证了该数值计算模型及方法的合理性。在此基础上,建立了鸟撞典型薄壁结构数值计算模型,研究了鸟弹不同撞击角度和速度下典型薄壁结构蒙皮极限厚度值,结果表明,随着撞击速度的增大,蒙皮极限厚度的变化对撞击角度十分敏感。拟合了典型薄壁结构蒙皮极限厚度与鸟弹撞击角度和速度之间的数学关系,为飞机薄壁结构抗鸟撞设计提供技术支撑。

【Abstract】 In order to design thin-walled aircraft structures that meet the requirements of airworthiness under bird strike, it is worthy to carry out experiments and numerical simulations on the responses of typical thin-walled aircraft structures under bird strike. A bird strike test on an aircraft nose wainscot thin-walled structure, was performed and the smoothed particle hydrodynamics-finite element method(SPH-FEM) was used, based on the explicit finite element analysis commercial software, PAM-CRASH, to establish a numerical model for simulating the bird hitting the thin-walled structure of the wall. The results show that the wall structure damage model mainly includes the damage modes of skin tear and rivet, break and good consistency between the numerieal and experimental results verifies, the rationality of the numerical calculation model and method. On this basis, a numerical model for general and typical thin-walled structures was established, and the ultimate thickness of typical thin-walled structures was analysed at different impact angles and velocities of bird projectile. The results show that with the increase of impact velocity, the change of ultimate thickness of the skin is very sensitive to the impact angle. The mathematical relationship between the ultimate thickness of the skin of the typical thin-walled structure and the impact angle and velocity of bird projectile was fitted, which provides technical support for the design of anti-bird impact thin-walled aircraft structures.

【基金】 国家自然科学基金项目(11472225);民机十三五预研项目(MJ-2018-F-18)
  • 【文献出处】 振动与冲击 ,Journal of Vibration and Shock , 编辑部邮箱 ,2022年14期
  • 【分类号】V214
  • 【下载频次】168
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