某型航空发动机振动环境统计

目的研究某型航空发动机振动应力测量数据PSD在整个频率带宽内不完全服从对数正态分布情况下的振动环境统计方法。方法在对数据进行对数正态分布检验的基础上,采用一种将正态容差限和非参数上限统计方法相结合的方法。结果该方法的振动环境统计结果介于传统单独采用正态容差限或非参数上限之间。结论对比结果表明,该方法用于确定航空发动机的振动环境条件合理可行。

Statistical Estimation of Vibration Environment for a Certain Aero-engine

Objective The statistical estimation method of vibration environment was studied, which was applied to the condition that the vibration data PSD of aero-engine obeyed lognormal distribution incompletely in the whole frequency bandwidth. Methods Based on the lognormal distribution test of the vibration data, a method was used combining normal tolerance limits and non-parameter upper limits. Results The results of this method were between the traditional normal tolerance limits and the non-parameter upper limits. Conclusion The comparison results showed that this method was reasonable and feasible for determining the vibration environment for aero-engine.