基于分类增强改进Kriging的民用飞机结构可靠性分析

Structure Reliability analysis of civil aircraft based on improved Kriging based on classification enhancement strategy

摘要:

民用飞机结构可靠性性能直接影响相应功能是否能够正常实现。为了提高民用飞机结构可靠性分析的精度和效率，提出基于分类增强策略的改进Kriging。在该方法中，分类增强策略旨在通过种群的分类和个体的各异激励，寻找失效域的全局最优设计点。改进Kriging 将单个样本对总体功能函数的指示影响引入Kriging建模机制中，适应性地模拟输入变量与输出响应之间的函数关系。结合有限元分析数据，以民用飞机前轮转弯齿轮弯曲应力为案例，验证所提方法在功能函数建模和失效概率估计中的有效性。结果表明：所提出的IKCES方法可捕获最优设计点和指示误差最小化，提升民用飞机前轮转弯齿轮弯曲应力可靠性分析的性能，从而保障民用飞机前轮转向的功能实现。

Abstract:

The reliability analysis performance of civil aircraft structures directly affects whether the corresponding functions can be realized normally. To improve the accuracy and efficiency of reliability analysis of nose wheel steering gear, an improved Kriging based on classification enhancement strategy (IK-CES) is proposed. The classification enhancement strategy aims to achieve global optimization of the design point for the failure domain through population classification and individual incentives. Improving Kriging by incorporating the indicative impact of samples on the overall functional function into the Kriging modeling mechanism, which adaptively simulates the functional relationship between input variables and output response. Taking the bending stress of the nose wheel steering gear of civil aircraft as a case study, the effectiveness of the proposed method in functional function modeling and failure probability estimation is verified by combining finite element analysis data. The case results show that the proposed IK-CES method can capture the optimal design point and minimize the indication error, improve the reliability analysis performance of the bending stress of the nose wheel steering gear of civil aircraft, and ensure the functional realization of the nose wheel steering gear of civil aircraft.