用于鸟撞试验的仿真鸟弹研究

对用于飞机结构抗鸟撞试验的仿真鸟弹进行了研究,给出了配方,其基体材料为明胶和水.密度是仿真鸟弹的关键参数,通过工艺流程和添加调质材料对其进行控制.鸟弹外形尺寸和重量由模具保证,制作出了满足规范要求的1.8kg标准形态鸟弹.利用4块12mm厚的铝板,进行了3次真实鸟弹试验和1次仿真鸟弹的鸟撞对比试验.试验结果表明,仿真鸟弹具有足够的强度可承受发射过载.同时仿真鸟弹与真实鸟弹的动态变形模式以及结构动态应变响应时间历程基本一致.其结构动态应变响应最大值仅相差3.2％,而结构残余变形相差8.7％.上述结果证明了本文研制的仿真鸟弹可以在结构抗鸟撞试验研究中替代真实鸟弹.

Investigation on the Artificial Bird Projectile used in Bird Strike Test

An artificial bird projectile used in aircraft structure against bird strike experiment was developed. Its basic compositions are gelatine and water. Density is a key parameter controlled by special manufacturing process and adding quenched and tempered materials. The dimension and weight of artificial bird projectile are guaranteed by the mold. Thus, a 1.8kg standard form of bird projectile was manufactured to meet the regulatory requirements. Three real bird strike tests and one artificial bird strike comparative test were carried out. The target is four aluminium plates with 12mm thickness. Results show that the artificial bird projectile has sufficient strength and can withstand launch overload. The dynamic deformation mode and the dynamic strain response time history of structure of artificial bird projectile are basicly consistent with real bird. The maximum difference of structure dynamic strain response is only 3.2%; while the difference of structure residual deformation is 8.7%. Above results prove that the artificial bird projectile developed in this paper can substitute real bird in bird strike experiment.