基于三元区间数的鸟撞座舱盖的不确定性分析

Uncertainty analysis of the bird strike on canopy with the interval numbers of three parameters

为了研究鸟撞座舱盖的安全问题,建立了基于光滑流体粒子动力学和有限元法耦合的鸟撞座舱盖模型。根据目前国内研究现状及缺乏相关鸟撞试验数据的情况,提出了采用三元区间数描述鸟撞不确定参数的方法,即小元表示不确定参数最小界限值,大元表示最大界限值,特元表示该不确定性参数最可能出现或者工程师最易选定的值。在此基础上,提出了应用确定性和区间相结合的算法对于三元区间数下鸟撞不确定性模型的求解方法,以及关于三元区间数的概率分布函数计算方法。计算结果与实际情况相符,说明三元区间数的鸟撞模型可有效地计算不确定性的鸟撞问题。

In order to study the security issues of bird strike, a smoothed particle hydrodynamics （SPH） and finite element method （FEM） model was built by combining a bird model based on SPH and a canopy model based on the FEM under the interaction. According to current domestic bird re search status and lack of experimental data, the interval of three parameters is to describe the bird strike uncertainty. The small parameter is defined as minimum threshold of the uncertain parame ters, the large parameter is the maximum limit value, and the middle parameter represents the un certainty parameter which is most likely to occur. A solution method employing algorithms for combi nation of certainty and interval for the uncertainty bird strike model is proposed. The distribution function in the interval of three parameters is also presented. The final calculated results were in consistency with the actual situation. Demonstrating that the strategy of bird strike models of the in terval numbers of the three parameters is effective for the calculation of uncertainty bird strike prob lems.