Study on Vibration and Fatigue of Distributed Connection Structures of Reusable Aircrafts
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.
reusable aircraftdistributed connection structurevibration characteristicsfatigue life
国家科技期刊平台
NSTL
万方数据
维普
