航空发动机套齿动态装配间隙非概率优化设计

为解决航空发动机套齿动态装配间隙的响应问题,在考虑动态变形和参数不确定性的情况下,将1种非概率区间分析方法与Kriging响应面模型及响应面优化方法相结合,对套齿初始装配间隙进行了可靠性优化设计。以某刚性套齿联轴器作为数值算例,在确定性设计的基础上,考虑机械载荷、热载荷、材料参数的分散性,运用区间分析方法得到了动态装配间隙的响应范围,利用非概率可靠性指标对初始装配间隙进行了优化设计。与确定性设计相比,优化设计提高了结构的可靠性;与概率设计相比,优化设计降低了对不确定参数的信息要求。验证了非概率方法解决装配对象不确定性结构响应问题的可行性与适用性。

Non-probabilistic Optimization Design of Dynamic Assembly Gap for Aeroengine Spline

In order to solve the problem of uncertain response of the dynamic assembly gap for aeroengine spline, considering the dynamic deformation, a non-probabilistic interval analysis method was combined with the Kriging response surface model and the response surface optimization method, and the reliability optimization design of the initial assembly gap for spline was carried out. A rigid spline coupling was taken as a numerical example, based on the deterministic design, considering the dispersion of mechanical load, thermal load and material parameters, the interval analysis method was used to obtain the dynamic response range of the gap, and a non-probabilistic reliability index was used to optimize the initial assembly gap. Compared with the deterministic design, the reliability of the structure is improved. Compared with the probabilistic design, the information requirement of the uncertain parameters is reduced. The feasibility and applicability of non-probabilistic method to solve the problem of uncertain structural response of assembly objects are verified