中国机械工程2024，Vol.35Issue(1)：45-55,11.DOI:10.3969/j.issn.1004-132X.2024.01.004
重复使用飞行器分布式连接结构振动及疲劳研究
Study on Vibration and Fatigue of Distributed Connection Structures of Reusable Aircrafts
摘要
Abstract
Accurate calculation of the vibration characteristics and fatigue life of the distributed connection structures between reusable spacecraft and engines was crucial for ensuring the safe opera-tions of aerospace transportation systems.Focusing on the distributed connection structures,the fea-sibility of experimental validation for finite element simulation methods was demonstrated.The vibra-tion characteristics of the distributed connection structures were explored in both of the time and fre-quency domains,and the fatigue lives of the structures were calculated under different operating con-ditions.The findings reveal a commendable concordance between the finite element results of the hys-teresis curve for the connection structures and experimental observations.Under cyclic loading at dif-ferent excitation frequencies,the connection bolts manifest stress increments or decrements,indica-tive of fatigue effects.The distributed connection structures elicit significantly heightened responses at the 1st and 5th natural frequencies.Decreasing the excitation magnitude substantially augments the fa-tigue lives of the connection structures,and an escalation in bolt pre-tightening forces is found to en-hance fatigue lives as well.However,an increase in excitation frequency only marginally diminishes the operational lifespans,while the cyclic lifespans persist within the same order of magnitude.Fur-thermore,following the introduction to thermal and creep effects,the distributed connection struc-tures may withstand a maximum of only five thermal cycling loads.关键词
重复使用飞行器/分布式连接结构/振动特性/疲劳寿命Key words
reusable aircraft/distributed connection structure/vibration characteristics/fatigue life分类
航空航天引用本文复制引用
沈民民,史锐,郭鹏飞,杨旸,杨晓东,杨继厚..重复使用飞行器分布式连接结构振动及疲劳研究[J].中国机械工程,2024,35(1):45-55,11.基金项目
国家自然科学基金重点项目(12332001) （12332001）
