鸟体动力学本构模型参数反演的并行优化技术

Inversing Constitutive Parameters of Bird by Parallel Optimization Technology

研究鸟体本构模型的动力学过程,是飞行器抗鸟撞,保证飞行安全的重要问题。由于鸟体模型参数难确定,为得到准确而合理的鸟体参数,在已知鸟体本构模型的前提下,采用并行优化技术对本构参数进行反演。将鸟撞平板的试验结果与数值仿真结果的相对误差平方和最小作为目标函数,将待反演的鸟体参数作为设计变量,在同一撞击速度范围内,将鸟撞不同靶板分为不同工况构造并行优化反演模型。把反演得到的鸟体参数代回到鸟撞平板仿真模型中检验,经与试验结果对比,效果较好,表明采用的并行优化技术是有效的、可靠的。并行优化反演技术的实现为更准确的获取鸟体参数提供了新的思路和方法,也为提高飞行器抗鸟撞设计研究提供有益参考。

Bird - impact is a complex dynamic process and determining the parameters of the bird＇s constitutive model is one of the main problems which trouble the simulation study. When the bird＇s constitutive model was selected, in order to get the accurate and reasonable parameters of bird, parallel optimization technique is applied to inverse the bird parameters. The optimization objective function was to minimize the square sum of percentage errors between the test values and the numerical results and the bird＇s material parameters were the optimization variables. In the same impact velocity range, bird impacting different target plate was divided into different cases, then the inversion model of parallel optimization was created and the more reasonable bird＇s parameters were attained. Finally, the validity and reliability of the inversion model were verified by taking the inversion parameters back to the bird striking numerical model and the numerical results agree well with the experimental results. The inversion method of this paper provides a new idea to identify the material parameters of bird and a useful reference to enhance the study of the bird - impact.