火箭推进2025，Vol.51Issue(2)：104-114,11.DOI:10.3969/j.issn.1672-9374.2025.02.011
航天发动机引压管路随机振动疲劳失效分析
Random vibration fatigue failure analysis of pressure pipeline for aerospace engine
摘要
Abstract
The fatigue damage accumulation of micro pipeline of aerospace engines under random vibration loading leads to fatigue failure,which impacts the safety of the engine.For this reason,research on the fatigue failure mechanism and life assessment method of the micro pipeline under pre-stress is carried out.Firstly,analyzed the random vibration experiments of the pipelines,and clarified the fatigue damage evolution mechanism through multi-scale fracture morphology analysis,then took the acceleration acquisition at both ends of the pipelines in the experiments as the data input,and established the random vibration prediction model of the pipelines under multi-source excitation and pre-stress based on the Ansys finite element simulation software;subsequently,the power spectral density function of the dangerous point with the largest dynamic response is extracted,and five commonly used stochastic vibration fatigue life frequency domain assessment models are compared in Matlab software,and the results show that the assessment results of the Tovo-Benasciutti model have the smallest error with the test;finally,based on the above vibration fatigue life method,the effects of internal pressure,displacement of pipeline joints,and additional mass on the vibration characteristics and fatigue life of the pipeline are analyzed.关键词
微管路结构/随机振动/疲劳寿命评估/预应力模态分析/应力幅值概率密度函数Key words
micro-pipeline/random vibration/fatigue life assessment/pre-stressed modal analysis/stress amplitude probability density function引用本文复制引用
肖策,张晋岢,韩奕晨,李哲,周建平..航天发动机引压管路随机振动疲劳失效分析[J].火箭推进,2025,51(2):104-114,11.基金项目
国家自然科学基金(52305128) （52305128）
